CN115750089A - A high-temperature molten salt heat storage coupled gas-fired power generation peak-shaving system and its operation method - Google Patents

Abstract

The invention relates to a high-temperature molten salt heat storage coupling gas-fired power generation peak regulation system and its operation method, including a gas turbine generator set, a flue gas heat exchange device, a molten salt heat storage heat exchange device, a steam turbine generator set and a circulating waterway; The heat exchange device includes a low-temperature molten salt storage tank, a low-temperature molten salt pump, a high-temperature molten salt storage tank, a high-temperature molten salt pump, and a molten salt steam heat exchange mechanism; the flue gas outlet of the gas turbine generator set and the flue gas inlet of the flue gas heat exchange device Connected, the low-temperature molten salt storage tank, the flue gas heat exchange device, the high-temperature molten salt storage tank and the molten salt steam heat exchange mechanism are connected in sequence to form a circulating heat storage and heat exchange circuit. The steam turbine generator set, the molten salt steam heat exchange mechanism and the circulating water circuit Connected to form a steam cycle power generation circuit; the molten salt inlet and outlet of the low-temperature molten salt storage tank are provided with low-temperature molten salt bypass pipes, and the molten salt inlet of the high-temperature molten salt storage tank and the molten salt outlet of the high-temperature molten salt pump are provided with high-temperature Molten salt bypass pipe; this system can perform deep peak shaving with higher peak shaving capacity.

Description

A high-temperature molten salt heat storage coupled gas-fired power generation peak-shaving system and its operation method

technical field

The invention relates to the technical field of thermal power flexibility, in particular to a peak-shaving system and an operating method for high-temperature molten salt heat storage coupled with gas-fired power generation.

Background technique

At present, our country's policy attaches great importance to the promotion of new energy power and reduces the proportion of thermal power units, which makes the development of thermal power units face severe challenges. In the future, thermal power generation will inevitably give way to the development of new energy power, which will make the main functions of thermal power generation fundamentally The change will transform the main power supply from the original power supply guarantee to a flexible and adjustable power supply. In recent years, due to the vigorous development of new energy power, a high proportion of new energy power has been connected to the power grid, resulting in a serious phenomenon of "abandoning wind and light", which has brought great challenges to the safe operation of the power grid and the guarantee of power supply. Therefore, it is imminent to increase the proportion of flexible and adjustable power sources in the grid to enhance the ability of the grid to absorb new energy power and increase the proportion of clean and green power in the grid.

At present, the gas-steam combined cycle method has become the fastest-growing form of power generation in the world due to its advantages of high power generation efficiency, short construction period, and convenient operation. This also has great guiding significance for my country's current power structure adjustment. However, when the combined cycle unit participates in grid power peak regulation, the operating load fluctuates frequently with the fluctuation of the electricity load and new energy power, which leads to a significant reduction in the efficiency of the combined cycle unit. , when the unit load rate is 60%, the heat consumption will increase by 8%, and when the unit load rate is 40%, the heat consumption will increase by 20%. Therefore, it is very important to integrate energy storage devices in the combined cycle system to ensure that the unit can still operate at a higher load when participating in power peak regulation, and to improve the efficiency and flexibility of the overall system.

Molten salt heat storage technology has developed into the most mainstream high-temperature heat storage technology in the world due to its advantages of low cost, high heat capacity, and good safety. Therefore, using molten salt heat storage technology to solve the problem of insufficient power peak regulation capacity in thermal power plants dominated by combined cycle units is a very promising technology application method. Among the relevant patented technologies, there are mainly technical application methods such as direct heating of molten salt by high-temperature flue gas for heat storage and peak regulation, direct heating of molten salt by electric energy for heat storage and peak regulation, and direct heating of molten salt by high-parameter steam for heat storage and peak regulation. High-temperature flue gas and high-parameter steam heat molten salt for heat storage. When the gas turbine unit maintains high-efficiency and stable operation, the operating load of the steam turbine generator unit cannot be reduced to zero, and the peak-shaving capacity of heat storage is limited, which cannot meet the deep power peak-shaving requirements of the grid. .

Contents of the invention

The technical problem to be solved by the present invention is to overcome the problem that when the gas turbine set in the prior art maintains high efficiency and stable operation, the operating load of the steam turbine generator set cannot be reduced to zero, and the heat storage peak-shaving capability is limited, which cannot meet the deep power peak-shaving requirements of the power grid defects, thereby providing a high-temperature molten salt heat storage coupled gas-fired power generation peak-shaving system and an operation method.

To achieve the above object, the present invention adopts the following technical solutions:

A high-temperature molten salt heat storage coupled gas-fired power generation peak-shaving system, including a gas turbine generator set, a flue gas heat exchange device, a molten salt heat storage heat exchange device, a steam turbine generator set, and a circulating waterway;

The above-mentioned molten salt heat storage and heat exchange device includes a low-temperature molten salt storage tank, a low-temperature molten salt pump, a high-temperature molten salt storage tank, a high-temperature molten salt pump, and a molten salt steam heat exchange mechanism;

The flue gas outlet of the gas turbine generator set communicates with the flue gas inlet of the flue gas heat exchange device, the low temperature molten salt storage tank, the flue gas heat exchange device, the high temperature molten salt storage tank and the molten salt steam heat exchange mechanism connected in turn to form a circulating heat storage and heat exchange circuit, and the above-mentioned low-temperature molten salt pump is installed at the molten salt inlet of the above-mentioned flue gas heat exchange device, and the above-mentioned high-temperature molten salt pump is installed at the molten salt outlet of the above-mentioned high-temperature molten salt storage tank; the above-mentioned steam turbine generates electricity The unit, the above-mentioned molten salt steam heat exchange mechanism and the above-mentioned circulating waterway are connected in sequence to form a steam cycle power generation circuit, and the above-mentioned steam turbine generator set is connected with the steam outlet of the above-mentioned molten salt steam heat exchange mechanism;

A low-temperature molten salt bypass pipe is connected between the molten salt inlet and the molten salt outlet of the above-mentioned low-temperature molten salt storage tank, and a high-temperature molten salt bypass pipe is connected between the molten salt inlet of the above-mentioned high-temperature molten salt storage tank and the molten salt outlet of the above-mentioned high-temperature molten salt pump. Molten salt bypass pipe.

Preferably, the molten salt steam heat exchange mechanism includes a high-pressure superheater, a high-pressure steam drum, a medium-pressure superheater and a medium-pressure steam drum;

The molten salt outlet of the above-mentioned high pressure superheater is all connected with the molten salt inlet of the above-mentioned high-pressure steam drum and the molten salt inlet of the above-mentioned medium pressure superheater, and the molten salt inlet of the above-mentioned medium-pressure steam drum is connected with the molten salt outlet of the above-mentioned high-pressure steam drum and The molten salt outlet of the above-mentioned medium pressure superheater is connected, the molten salt inlet of the above-mentioned high-pressure superheater is connected with the molten salt outlet of the above-mentioned high-temperature molten salt pump, and the molten salt outlet of the above-mentioned medium-pressure steam drum is connected with the molten salt of the above-mentioned low-temperature molten salt storage tank. import connectivity;

The water inlet of the above-mentioned high-pressure steam drum is provided with a first water pump, and the water inlet of the above-mentioned medium-pressure steam drum is provided with a second water pump. The steam outlet of the above-mentioned high-pressure superheater is connected with the steam inlet of the above-mentioned high-pressure superheater, the steam outlet of the above-mentioned medium-pressure drum is connected with the steam inlet of the above-mentioned medium-pressure superheater, and the steam outlet of the above-mentioned high-pressure superheater is connected with the steam inlet of the above-mentioned medium-pressure superheater The steam outlets of the steam turbines are respectively connected with the high-pressure steam inlets and the medium-pressure steam inlets of the above-mentioned steam turbine generator sets.

Preferably, the flue gas heat exchange device includes a molten salt waste heat boiler, a molten salt low temperature heater and a molten salt high temperature heater, and the molten salt low temperature heater and the molten salt high temperature heater are arranged in the molten salt waste heat boiler , the above-mentioned low-temperature molten salt storage tank, the above-mentioned low-temperature molten salt heater, the above-mentioned high-temperature molten salt heater and the above-mentioned high-temperature molten salt storage tank are connected in sequence.

Preferably, the circulating water circuit includes a condenser, a condensed water pump, a third water pump, a deaerator, a fifth water pump and a feed water preheater, and the exhaust steam inlet of the above condenser is connected with the steam exhaust port of the above steam turbine generator set, The above-mentioned condenser, the above-mentioned condensate pump, the above-mentioned deaerator, the above-mentioned fifth water pump and the above-mentioned feedwater preheater are connected in sequence, the water outlet of the above-mentioned feedwater preheater is connected with the water inlet of the above-mentioned molten salt steam heat exchange mechanism, and the above-mentioned deaerator The water inlet of the oxygenator is communicated with a water supply pipe, and the above-mentioned third water pump is arranged on the above-mentioned water supply pipe.

Preferably, the flue gas outlet of the above-mentioned flue gas heat exchange device is also connected with a low-pressure steam generator, the water inlet of the upper low-pressure steam generator is connected with the water outlet of the above-mentioned feedwater preheater, and the flue gas inlet of the above-mentioned feedwater preheater is connected with the The flue gas outlet of the above-mentioned low-pressure steam generator is connected, and the steam inlet of the above-mentioned deaerator is connected with the steam outlet of the above-mentioned low-pressure steam generator.

Preferably, the flue gas outlet of the above-mentioned flue gas heat exchange device is also connected with a low-pressure steam superheater, the flue gas outlet of the above-mentioned low-pressure steam superheater is connected with the flue gas inlet of the above-mentioned low-pressure steam generator, and the steam outlet of the above-mentioned low-pressure steam generator It is connected with the steam inlet of the above-mentioned low-pressure steam superheater, and the steam outlet of the above-mentioned low-pressure steam superheater is also connected with industrial steam users.

Preferably, the circulating water circuit further includes a hot water storage tank, the outlet of the hot water storage tank is connected to a fourth water pump, the water inlet of the hot water storage tank is connected to the water outlet of the feed water preheater, and the fourth water pump The water outlets are all communicated with the water inlet of the above-mentioned molten salt steam heat exchange mechanism and the water inlet of the above-mentioned low-pressure steam generator.

An operation method of a high-temperature molten salt heat storage coupled gas-fired power generation peak-shaving system, comprising:

When the thermal power plant does not participate in power peak regulation, the above-mentioned gas turbine generator set and the above-mentioned steam turbine generator set maintain high-load operation to ensure high-efficiency operation of the thermal power plant. During operation, the above-mentioned molten salt heat storage and heat exchange device only participates in the heat exchange process , does not participate in heat storage and heat release, the molten salt only heats the circulating water into steam by carrying the waste heat of the flue gas;

When the thermal power plant participates in power peak regulation and needs to reduce the grid load, the above-mentioned gas turbine generator set still maintains high-load operation, and reduces the operating load of the steam turbine generator set to reduce the grid load. During operation, the above-mentioned molten salt heat storage and heat exchange The device participates in the heat exchange process and also participates in heat storage. Part of the molten salt transports the waste heat of the flue gas to heat the circulating water into steam, and a part of the molten salt with the waste heat of the flue gas is stored;

When the thermal power plant participates in power peak regulation and needs to increase the on-grid power load, the above-mentioned gas turbine generator set still maintains high-load operation, and increases the above-mentioned steam turbine generator set operating load to increase the on-grid power load. During operation, the above-mentioned molten salt heat storage and heat exchange The device participates in the heat exchange process and also participates in heat release. A part of the molten salt transports the waste heat of the flue gas to heat the circulating water into steam, and a part of the stored molten salt with the waste heat of the flue gas releases heat to heat the circulating water into steam;

When the thermal power plant participates in power peak regulation and needs to deeply reduce the grid load, the above-mentioned gas turbine generator set still maintains high-load operation, and the above-mentioned steam turbine generator set operates at zero load. During the operation, the above-mentioned molten salt heat storage and heat exchange device does not participate In the heat exchange process, only heat storage is performed, and the molten salt that absorbs the waste heat of the flue gas is all stored.

Preferably, when the thermal power plant participates in power peak regulation and needs to reduce the load on the grid, the high-temperature molten salt from the above-mentioned flue gas heat exchange device is divided into two paths, and one path enters the above-mentioned high-temperature molten salt storage tank for heat storage, and the above-mentioned high-temperature molten salt pump does not operate , the other way enters the above-mentioned molten salt steam heat exchange mechanism through the above-mentioned high-temperature molten salt bypass pipe, exchanges heat with the circulating water in it, heats it into steam, and then enters the above-mentioned steam turbine generator set to generate electricity, and finally the formed low-temperature molten salt enters After the above-mentioned low-temperature molten salt bypass pipe is merged with the low-temperature molten salt output from the above-mentioned low-temperature molten salt storage tank, and driven by the above-mentioned low-temperature molten salt pump, it enters the above-mentioned flue gas heat exchange device for heating to form high-temperature molten salt for recycling. Then enter the above-mentioned high-temperature molten salt storage tank for storage and enter the above-mentioned molten salt steam heat exchange mechanism for recycling.

Preferably, when the thermal power plant participates in power peak regulation and needs to increase the grid-connected power load, the high-temperature molten salt from the above-mentioned flue gas heat exchange device passes through the above-mentioned high-temperature molten salt bypass pipe and the high-temperature molten salt from the above-mentioned high-temperature molten salt pump under the action of the above-mentioned high-temperature molten salt pump. After the high-temperature molten salt in the storage tank merges, it enters the above-mentioned molten salt steam heat exchange mechanism together, exchanges heat with the circulating water in it, heats it into steam, and then enters the above-mentioned steam turbine generator set to generate electricity, and finally forms a low-temperature molten salt. One way returns to the above-mentioned low-temperature molten salt storage tank for storage, and the other way passes through the above-mentioned low-temperature molten salt bypass pipe, and is driven by the above-mentioned low-temperature molten salt pump into the above-mentioned flue gas heat exchange device for reheating to form high-temperature molten salt for recycling .

Compared with the prior art, the beneficial effects of the present invention are:

The system heats the molten salt through the waste heat of the flue gas, and the molten salt transports the waste heat of the flue gas to reheat the circulating water into steam, so that the steam turbine generator set generates electricity, and the molten salt becomes the carrier of the waste heat of the flue gas, through the low-temperature molten salt storage tank and the low-temperature molten salt pump , high-temperature molten salt storage tank, high-temperature molten salt pump, molten salt steam heat exchange mechanism, low-temperature molten salt bypass pipe and high-temperature molten salt bypass to adjust the operating load of the steam turbine generator set, overcome the existing technology to use high-parameter steam Or part of the high-temperature flue gas heats the molten salt for heat storage, which makes it impossible for the gas turbine unit to operate at high efficiency while making the operating load of the steam turbine unit unable to reduce to zero. It can reduce the operating load of the steam turbine unit to zero, greatly improve the power peak-shaving capability of the thermal power plant, and meet the deep power peak-shaving requirements of the power grid, and when the thermal power plant participates in power peak-shaving and needs to reduce the output load The thermal device stores the waste heat of the high-temperature flue gas, avoids choosing to reduce the operating load of the gas turbine unit to meet the power peak regulation requirements, ensures the high-efficiency operation of the gas turbine unit, and relatively improves the energy utilization efficiency of the thermal power plant.

Description of drawings

In order to more clearly illustrate the specific implementation of the present invention or the technical solutions in the prior art, the following will briefly introduce the accompanying drawings that need to be used in the specific implementation or description of the prior art. Obviously, the accompanying drawings in the following description The drawings show some implementations of the present invention, and those skilled in the art can obtain other drawings based on these drawings without any creative work.

FIG. 1 is a system block diagram of an embodiment of the present invention.

Explanation of reference signs:

1. Gas turbine generating set; 101. Gas turbine compressor; 102. Gas turbine combustion chamber; 103. Gas turbine turbine; 104. First generator; 2. Flue gas heat exchange device; 201. Molten salt waste heat boiler; 202. Molten salt low temperature heater; 203. Molten salt high temperature heater; 3. Low temperature molten salt storage tank; 4. Low temperature molten salt pump; 5. High temperature molten salt storage tank; 6. High temperature molten salt pump; 7. Molten salt steam exchange Thermal mechanism; 71. High-pressure superheater; 72. High-pressure steam drum; 73. Medium-pressure superheater; 74. Medium-pressure steam drum; 75. First water pump; 76. Second water pump; 8. Low-temperature molten salt bypass pipe; 9. High temperature molten salt bypass pipe; 10. Turbine generator set; 105. Medium and high pressure cylinder of steam turbine; 106. Low pressure cylinder of steam turbine; 107. Second generator; 11. Condenser; 12. Condensate water pump; 13. Third Water pump; 14. Deaerator; 15. Feed water preheater; 16. Water supply pipe; 17. Condensate water pipe; 18. Low pressure steam generator; 19. Low pressure steam superheater; 20. Industrial steam user; 21. Hot water storage Tank; 22, the fourth water pump; 23, the fifth water pump; 24, the first valve; 25, the second valve; 26, the third valve; 27, the fourth valve; 28, the fifth valve; 29, the sixth valve; 30. Seventh valve; 31. Eighth valve; 32. Ninth valve; 33. Tenth valve; 34. Eleventh valve; 35. Twelfth valve; 36. Thirteenth valve; 37. Fourteenth Valve; 38, fifteenth valve; 39, sixteenth valve; 40, seventeenth valve; 41, eighteenth valve; 42, nineteenth valve; 43, high-pressure steam inlet pipe; 44, medium-pressure steam inlet Tube.

Detailed ways

The technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Apparently, the described embodiments are some of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" etc. The indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, or in a specific orientation. construction and operation, therefore, should not be construed as limiting the invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and should not be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that unless otherwise specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection. Connected, or integrally connected; it may be mechanically connected or electrically connected; it may be directly connected or indirectly connected through an intermediary, and it may be the internal communication of two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention in specific situations.

As shown in Figure 1, an embodiment of the present invention provides a high-temperature molten salt heat storage coupled gas-fired power generation peak-shaving system, including a gas turbine generator set 1, a flue gas heat exchange device 2, a molten salt heat storage and heat exchange device, and a steam turbine power generation The unit 10 and the circulating waterway; the gas turbine generating unit 1 includes a gas turbine compressor 101, a gas turbine combustor 102, a gas turbine turbine 103 and a first generator 104, an exhaust port of the gas turbine compressor 101 and an air inlet of the gas turbine combustor 102 connection, the exhaust port of the gas turbine combustor 102 is connected to the air inlet of the gas turbine 103, the exhaust port of the gas turbine 103 is connected to the flue gas inlet of the molten salt waste heat boiler 201, and the gas turbine 103 drives the first power generation generator 104 for power generation, and the gas turbine turbine 103 is coaxially connected with the gas turbine compressor 101; the molten salt heat storage and heat exchange device includes a low-temperature molten salt storage tank 3, a low-temperature molten salt pump 4, a high-temperature molten salt storage tank 5, and a high-temperature molten salt Pump 6 and molten salt steam heat exchange mechanism 7; flue gas heat exchange device 2 includes molten salt type waste heat boiler 201, molten salt low temperature heater 202 and molten salt high temperature heater 203, molten salt low temperature heater 202 and molten salt high temperature heating The device 203 is sequentially installed in the molten salt waste heat boiler 201 along the flue gas flow direction, and the low-temperature molten salt storage tank 3, the molten salt low-temperature heater 202, the molten salt high-temperature heater 203 and the high-temperature molten salt storage tank 5 are connected in sequence.

Specifically, the flue gas outlet of the gas turbine turbine 103 communicates with the flue gas inlet of the flue gas heat exchange device 2, the low temperature molten salt storage tank 3, the flue gas heat exchange device 2, the high temperature molten salt storage tank 5 and the molten salt steam for heat exchange The mechanisms 7 are connected in sequence to form a circulating heat storage and heat exchange circuit; specifically, the molten salt outlet of the low-temperature molten salt storage tank 3 is connected to a first pipe, and a first valve 24 is arranged on the first pipe, and the first pipe and the molten salt are heated at low temperature There is a second pipe connected between the devices 202. The low-temperature molten salt pump 4 is arranged at the molten salt inlet of the molten salt low-temperature heater 202 and the low-temperature molten salt pump 4 is arranged on the second pipe. The molten salt low-temperature heater 202 and the molten salt high-temperature The heater 203 is connected, the molten salt outlet of the molten salt high-temperature heater 203 is connected with a third pipe, the molten salt inlet of the high-temperature molten salt storage tank 5 is connected with a fourth pipe, and the fourth pipe is connected with a second valve 25 and a third pipe. The pipe communicates with the fourth pipe, the molten salt outlet of the high-temperature molten salt storage tank 5 is connected with the fifth pipe, the fifth pipe is connected with the third valve 26 and the high-temperature molten salt pump 6 is located on the fifth pipe, the third pipe and the fifth pipe are connected. The five pipes are connected with a high-temperature molten salt bypass pipe 9, and the high-temperature molten salt bypass pipe 9 is connected with a fourth valve 27, and the fifth pipe is connected with the high-temperature molten salt inlet of the molten salt steam heat exchange mechanism 7, and the molten salt steam exchange The low-temperature molten salt outlet of the thermal mechanism 7 is connected to the molten salt inlet of the low-temperature molten salt storage tank 3 with a sixth pipe, the fifth valve 28 is connected to the sixth pipe, and the low-temperature molten salt is connected between the sixth pipe and the first pipe. The bypass pipe 8 and the low-temperature molten salt bypass pipe 8 are connected with the sixth valve 29; when the circulating heat storage and heat exchange circuit is used, four closed circuits can be formed in the system according to the usage conditions, as follows, circuit one: the fourth valve 27 , the sixth valve 29 and the low temperature molten salt pump 4 are opened, the molten salt low temperature heater 202, the molten salt high temperature heater 203, the high temperature molten salt bypass pipe 9, the molten salt steam heat exchange mechanism 7 and the low temperature molten salt bypass pipe 8 A closed circuit is formed, and the low-temperature molten salt storage tank 3 and the high-temperature molten salt storage tank 5 do not participate in the use. In this circuit, the molten salt heat storage and heat exchange device only participates in the heat exchange process, and does not participate in heat storage and heat release, and carries flue gas The waste heat only heats the circulating water into steam; circuit two: the first valve 24, the second valve 25, the fourth valve 27, the sixth valve 29 and the low temperature molten salt pump 4 are turned on, the molten salt low temperature heater 202, the molten salt high temperature heater 203. The high-temperature molten salt bypass pipe 9, the molten salt steam heat exchange mechanism 7 and the low-temperature molten salt bypass pipe 8 form a closed loop, and the low-temperature molten salt storage tank 3 and the high-temperature molten salt storage tank 5 participate in use. In this loop, The molten salt heat storage and heat exchange device participates in the heat exchange process and also participates in heat storage. A part of the molten salt transports the waste heat of the flue gas to heat the circulating water into steam, and a part of the molten salt with the waste heat of the flue gas enters the high-temperature molten salt storage tank 5 for storage; the circuit Three: The third valve 26, the fourth valve 27, the fifth valve 28, the sixth valve 29, the low temperature molten salt pump 4 and the high temperature molten salt pump 6 are turned on, the molten salt low temperature heater 202, the molten salt high temperature heater 203, the high temperature The molten salt bypass pipe 9, the molten salt steam heat exchange mechanism 7 and the low-temperature molten salt bypass pipe 8 form a closed circuit, and the low-temperature molten salt storage tank 3 and the high-temperature molten salt storage tank 5 participate in use. In this circuit, the molten salt storage tank The heat exchange device participates in the heat exchange process, and also participates in the heat release. A part of the molten salt transports the waste heat of the flue gas to heat the circulating water into steam, and a part The high-temperature molten salt is stored separately in the high-temperature molten salt storage tank 5 and transported out by the high-temperature molten salt pump 6 to release heat, which is used to heat the circulating water into steam and supplement the heat in the system; loop four: the first valve 24 and the second valve 25 When the low-temperature molten salt pump 4 is turned on, the low-temperature molten salt storage tank 3, the molten salt low-temperature heater 202, the molten salt high-temperature heater 203 and the high-temperature molten salt storage tank 5 form a one-way circuit, and the molten salt only participates in the heat storage process.

Specifically, when the thermal power plant does not participate in power peak regulation, both the gas turbine generator set 1 and the steam turbine generator set 10 maintain high-load operation, and loop 1 operates. Unit 1 still maintains high-load operation, and when it is necessary to reduce the operating load of the above-mentioned steam turbine generator set 10 to reduce the grid load, loop 2 operates; when the thermal power plant participates in power peak regulation and needs to increase the grid load, the gas turbine generator set 1 remains high. Load operation, when it is necessary to increase the operating load of the above-mentioned steam turbine generator set 10 to increase the grid load, the loop three operates; When the operating load of the steam turbine generator set 10 is zero, loop 4 operates; in summary, the molten salt is heated by the residual heat of the flue gas, and the molten salt transports the residual heat of the flue gas to reheat the circulating water into steam, so that the steam turbine generator set 10 generates electricity, and the molten salt Become the carrier of waste heat of flue gas, through low temperature molten salt storage tank 3, low temperature molten salt pump 4, high temperature molten salt storage tank 5, high temperature molten salt pump 6, molten salt steam heat exchange mechanism 7, low temperature molten salt bypass pipe 8 and The coordinated operation of the high-temperature molten salt bypass adjusts the operating load of the steam turbine generator set 10, and overcomes the fact that the existing technology uses high-parameter steam or part of high-temperature flue gas to heat molten salt for heat storage and cannot make the gas turbine generator set 1 operate at high efficiency. The defect of limited peak-shaving capability that the operating load of the steam turbine generator set 10 cannot be reduced to zero realizes that the high-efficiency high-load operation of the gas turbine generator set 1 can still reduce the operating load of the steam turbine generator set 10 to zero, which greatly improves the thermal power plant The power peak shaving ability meets the deep power peak shaving requirements of the power grid, and when the thermal power plant participates in power peak shaving and needs to reduce the output power load, the molten salt heat storage and heat exchange device is used to store the high-temperature flue gas waste heat to avoid choosing to reduce The operating load of the gas turbine generator set 1 meets the requirements of power peak regulation, which ensures the high efficiency operation of the gas turbine generator set 1, thereby relatively improving the energy utilization efficiency of the thermal power plant.

The steam turbine generator set 10, the molten salt steam heat exchange mechanism 7, and the circulating waterway are connected in sequence to form a steam cycle power generation circuit; specifically, the steam turbine generator set 10 includes a steam turbine medium-high pressure cylinder 105, a steam turbine low-pressure cylinder 106, and a second generator 107. The steam inlet of the high-pressure cylinder 105 communicates with the high-pressure steam inlet of the molten salt steam heat exchange mechanism 7 through the high-pressure steam inlet pipe 43, and the steam inlet of the low-pressure cylinder 106 of the steam turbine communicates with the medium-pressure steam outlet of the molten salt steam heat exchange mechanism 7. The medium-pressure steam inlet pipe 44 communicates, and the exhaust port of the high-pressure cylinder 105 of the steam turbine is connected with the steam inlet of the low-pressure cylinder 106 of the steam turbine through the medium-low pressure communication pipe, and a nineteenth valve 42 is installed on the medium-low pressure communication pipe, and the steam turbine low-pressure The exhaust port of the cylinder 106 is connected with the exhaust steam inlet of the condenser 11, and the high-pressure cylinder 105 of the steam turbine and the low-pressure cylinder 106 of the steam turbine are coaxially connected with the second generator 107, and simultaneously act to drive the second generator 107 to generate electricity; The water circuit includes a condenser 11, a condensate pump 12, a third water pump 13, a deaerator 14, a fifth water pump 23 and a feed water preheater 15, and the exhaust steam inlet of the condenser 11 communicates with the steam exhaust port of the steam turbine generator set 10 , the condenser 11 is communicated with the condensate pump 12, the condensate pump 12 and the deaerator 14 are communicated with a condensate pipe 17, the condensate pipe 17 is communicated with a water replenishment pipe 16, and the water replenishment pipe 16 is successively connected with a third water pump 13 and a second Seventh valve 30, the eighth pipe is connected between the water outlet of the deaerator 14 and the water inlet of the feedwater preheater 15, the fifth water pump 23 is connected with the eighth pipe, and the water outlet of the feedwater preheater 15 is connected with the first Nine tubes.

Specifically, the flue gas outlet of the molten salt type waste heat boiler 201 is also connected to the low-pressure steam superheater 19 and the low-pressure steam generator 18 in sequence, and the flue gas outlet of the low-pressure steam generator 18 is connected to the flue gas inlet of the feed water preheater 15. The tenth pipe, the ninth pipe at the water outlet of the feed water preheater 15 communicates with the water inlet of the low-pressure steam generator 18 and the eleventh pipe is provided with an eighth valve 31, the low-pressure steam generator 18 The steam outlet of the deaerator 14 is connected with the steam inlet of the twelfth pipe, and the twelfth pipe is connected with the ninth valve 32, and the steam outlet of the low-pressure steam generator 18 is connected with the steam inlet of the low-pressure steam superheater 19 by the tenth pipe. Three pipes, the thirteenth pipe is connected with the tenth valve 33, and the steam outlet of the low-pressure steam superheater 19 is also connected with the industrial steam user 20. The steam is heated to provide steam to industrial users. On the other hand, the waste heat of the flue gas is used to preheat the circulating water, so that the waste heat of the flue gas can be fully utilized.

Specifically, the circulating waterway also includes a hot water storage tank 21, the water outlet of the hot water storage tank 21 is connected with a fourteenth pipe, and the fourteenth pipe is connected with an eleventh valve 34 and a fourth water pump 22, and the fourteenth pipe The water outlet is connected with the ninth pipe, and the fifteenth pipe is connected between the water inlet of the hot water storage tank 21 and the ninth pipe at the water outlet of the feed water preheater 15, and the fifteenth pipe is connected with the twelfth valve 35 , when the load decreases, the excess hot water can be stored in the hot water storage tank 21, and when the load increases, the hot water in the hot water storage tank 21 can be used to increase the temperature and flow rate of the circulating water and accelerate the generation of steam , the amount of steam required to meet the load.

Specifically, the molten salt steam heat exchange mechanism 7 includes a high-pressure superheater 71, a high-pressure steam drum 72, a medium-pressure superheater 73, and a medium-pressure steam drum 74; the molten salt inlet of the high-pressure superheater 71 is connected with a sixteenth pipe, and the fifth tube and the high-temperature molten salt bypass pipe 9 are connected with the sixteenth pipe, the molten salt outlet of the high-pressure superheater 71 is connected with the seventeenth pipe, and the seventeenth pipe is connected with the molten salt inlet of the high-pressure steam drum 72 with the eighteenth pipe. The eighteenth pipe is connected with the thirteenth valve 36, the molten salt outlet of the high-pressure steam drum 72 is connected with the nineteenth pipe, the nineteenth pipe is connected with the fourteenth valve 37, and the seventeenth pipe is connected with the medium pressure superheated The molten salt inlet of the device 73 is connected with the twentieth pipe, and the twentieth pipe is connected with the fifteenth valve 38, and the molten salt outlet of the medium pressure superheater 73 is connected with the twenty-first pipe, and the twelfth pipe is connected with the tenth pipe. Six valves 39, the molten salt inlet of the medium pressure steam drum 74 is connected with the 22nd pipe, the 19th pipe and the 21st pipe are all connected with the 22nd pipe, and the molten salt outlet of the medium pressure steam drum 74 passes through The sixth pipe is connected with the molten salt inlet of the low-temperature molten salt storage tank 3; the water outlet of the feed water preheater 15 is connected with the ninth pipe, and the water inlet of the high-pressure steam drum 72 is connected with the ninth pipe with the twenty-third pipe , the twenty-third pipe is connected with the first water pump 75 and the seventeenth valve 40 in turn, the high-pressure steam drum 72 heats the water in it into saturated steam, and the steam outlet of the high-pressure steam drum 72 communicates with the steam inlet of the high-pressure superheater 71 There is a twenty-fourth pipe, the steam outlet of the high-pressure superheater 71 is connected with the steam inlet of the high-pressure cylinder 105 of the steam turbine, and a high-pressure steam inlet pipe 43 is connected; the water inlet of the medium-pressure steam drum 74 is connected with the ninth pipe. Twenty-five pipes, the twenty-fifth pipe is connected with the second water pump 76 and the eighteenth valve 41 in turn, the medium pressure steam drum 74 heats the water in it into saturated steam, the steam outlet of the medium pressure steam drum 74 is connected with the medium pressure The steam inlet of the superheater 73 is connected with the twenty-sixth pipe, and the steam outlet of the medium-pressure superheater 73 is connected with the steam inlet of the steam turbine low-pressure cylinder 106 with the medium-pressure steam inlet pipe 44; Two paths enter the high-pressure steam drum 72 and the medium-pressure superheater 73, and then converge to the medium-pressure steam drum 74. After three times of heat exchange, the heating circulating water is high-pressure steam and medium-pressure steam, which fully enables the molten salt to exchange heat with water or steam , the high-pressure steam comes out from the high-pressure superheater 71 and enters the medium-high pressure cylinder 105 of the steam turbine through the high-pressure steam inlet pipe 43, and the medium-pressure steam enters the low-pressure cylinder 106 of the steam turbine from the medium-pressure superheater 73 through the medium-pressure steam inlet pipe 44, and jointly drives the second generator 107 Power generation; by rationally setting the molten salt circulation pipeline and steam circulation pipeline between the high-pressure superheater 71, high-pressure steam drum 72, medium-pressure superheater 73 and medium-pressure steam drum 74, the cascade efficiency of high-temperature molten salt heat is realized Utilization greatly reduces the heat transfer temperature difference, greatly reduces irreversible losses, increases the output of high-quality steam, and greatly improves the working ability of the steam turbine.

In summary, an operating method of a high-temperature molten salt heat storage coupled gas-fired power generation peak-shaving system includes:

When the thermal power plant does not participate in power peak regulation, both the gas turbine generator set 1 and the steam turbine generator set 10 maintain high-load operation to ensure the high-efficiency operation of the thermal power plant, while the high-temperature molten salt storage tank 5 does not store and release heat, but only performs heat exchange. Heat, at this time: after the high-temperature flue gas from the gas turbine turbine 103 heats the molten salt, it is all used to heat the feed water to produce steam, and then enters the steam turbine generator set 10 to perform work, that is, the operation circuit 1, the fourth valve 27, and the sixth valve 29 , and the low temperature molten salt pump 4 are turned on, the molten salt low temperature heater 202, the molten salt high temperature heater 203, the high temperature molten salt bypass pipe 9, the molten salt steam heat exchange mechanism 7 and the low temperature molten salt bypass pipe 8 form a closed loop, The low-temperature molten salt storage tank 3 and the high-temperature molten salt storage tank 5 are not used. Specifically, the thirteenth valve 36, the fourteenth valve 37, the fifteenth valve 38, and the sixteenth valve 39 are opened at the same time. The high-temperature molten salt from the heater 203 directly enters the high-pressure superheater 71 for the first-stage cooling, and then enters the high-pressure steam drum 72 and the medium-pressure superheater 73 in two ways for the second-stage cooling, and passes through the high-pressure steam drum 72 and the medium-pressure superheater The high-temperature molten salt cooled by the boiler 73 merges and then enters the medium-pressure steam drum 74 for third-stage cooling, and finally forms low-temperature molten salt and returns to the molten salt waste heat boiler 201, passing through the molten salt low-temperature heater 202 and the molten salt high-temperature boiler in turn. The heater 203 is heated to form a high-temperature molten salt, and then returns to the high-pressure superheater 71, and the molten salt heat exchange is performed back and forth in sequence.

Open the seventeenth valve 40 and the eighteenth valve 41 at the same time, the high-temperature feed water from the feed water preheater 15 is transported by the first water pump 75 to the high-pressure steam drum 72 to be heated to form high-pressure saturated steam, and then the high-pressure saturated steam enters the high-pressure superheater 71 is further heated to form high-pressure superheated steam, and then the high-pressure superheated steam enters the middle and high-pressure cylinder 105 of the steam turbine and the low-pressure cylinder 106 of the steam turbine through the high-pressure steam inlet pipe 43 to perform work to drive the second generator 107 to generate electricity, and at the same time, it comes from the feed water preheating The high-temperature feed water of the device 15 is sent to the medium-pressure steam drum 74 by the second water pump 76 to be heated to form medium-pressure saturated steam, and the medium-pressure saturated steam enters the medium-pressure superheater 73 to be further heated to form medium-pressure superheated steam, and then medium-pressure The superheated steam enters the low-pressure cylinder 106 of the steam turbine through the medium-pressure steam inlet pipe 44 to perform work to drive the second generator 107 to generate electricity. The condensed water pump 12 is sent to the deaerator 14 for heating, and then sent to the feed water preheater 15 by the fifth water pump 23 to be further heated by the waste heat of the flue gas from the low-pressure steam generator 18 to form high-temperature feed water. At the same time, the seventh valve 30 is opened, Water replenishment pipe 16 replenishes water.

Simultaneously open the eighth valve 31, the ninth valve 32 and the tenth valve 33, and the high-temperature feed water from the feed water preheater 15 is also sent to the low-pressure steam generator 18 to be further heated by the waste heat of the flue gas from the low-pressure steam superheater 19 to form a low pressure The saturated steam is then divided into two paths and enters the deaerator 14 and the low-pressure steam superheater 19 respectively. The low-pressure saturated steam enters the deaerator 14 to heat the condensed water from the condenser 11 and the supplementary water from the supplementary water pipe 16, and the low-pressure saturated steam After the steam enters the low-pressure steam superheater 19, it is further heated by the waste heat of the flue gas from the molten salt type waste heat boiler 201 into low-pressure superheated steam, and then sent to the industrial steam user 20 for external heating, and the third water pump 13 is used as the deaerator 14 Make up water to supplement the water supply required for heating the industrial steam users 20 .

When the thermal power plant participates in power peak regulation and needs to reduce the on-grid power load, the gas turbine unit still maintains high-load operation, and reduces the operating load of the steam turbine generator set 10 to reduce the on-grid power load, while the high-temperature molten salt storage tank 5 performs heat storage and heat exchange. This causes the excess high-temperature molten salt output by the molten-salt waste heat boiler 201 to use the high-temperature molten salt storage tank 5 for heat storage. The valve 29 and the low temperature molten salt pump 4 are opened, and the molten salt low temperature heater 202, the molten salt high temperature heater 203, the high temperature molten salt bypass pipe 9, the molten salt steam heat exchange mechanism 7 and the low temperature molten salt bypass pipe 8 form a closed loop , the low-temperature molten salt storage tank 3 and the high-temperature molten salt storage tank 5 participate in the use, specifically, open the thirteenth valve 36, the fourteenth valve 37, the fifteenth valve 38 and the sixteenth valve 39 at the same time, from the molten salt high temperature The high-temperature molten salt of the heater 203 is divided into two routes, one of which enters the high-temperature molten salt storage tank 5 for heat storage, and the amount of entering the high-temperature molten salt storage tank 5 can be increased by controlling, so as to control and reduce the high temperature delivered to the molten salt steam heat exchange mechanism 7 The amount of molten salt is used to further reduce the amount of superheated steam delivered to the steam turbine generator set 10 by the molten salt steam heat exchange mechanism 7, and further reduce the operating load of the steam turbine generator set 10, so that deeper peak regulation can be performed, and the other way enters the high pressure superheater 71 for the first stage of cooling, and then divided into two routes to enter the high-pressure steam drum 72 and the medium-pressure superheater 73 for the second-stage cooling. The medium-pressure steam drum 74 performs the third-stage cooling, and finally forms low-temperature molten salt and merges with the low-temperature molten salt output from the low-temperature molten salt storage tank 3, then returns to the molten salt waste heat boiler 201, and passes through the molten salt low-temperature heater 202 and The molten salt high-temperature heater 203 is heated to form high-temperature molten salt, and the reciprocating cycle, all excess high-temperature molten salt enters the high-temperature molten salt storage tank 5 for storage.

Open the seventeenth valve 40 and the eighteenth valve 41 at the same time, the high-temperature feed water from the feed water preheater 15 is transported by the first water pump 75 to the high-pressure steam drum 72 to be heated to form high-pressure saturated steam, and then the high-pressure saturated steam enters the high-pressure superheater 71 is further heated to form high-pressure superheated steam, and then the high-pressure superheated steam enters the middle and high-pressure cylinder 105 of the steam turbine and the low-pressure cylinder 106 of the steam turbine through the high-pressure steam inlet pipe 43 to perform work to drive the second generator 107 to generate electricity, and at the same time, it comes from the feed water preheating The high-temperature feed water of the device 15 is sent to the medium-pressure steam drum 74 by the second water pump 76 to be heated to form medium-pressure saturated steam, and the medium-pressure saturated steam enters the medium-pressure superheater 73 to be further heated to form medium-pressure superheated steam, and then medium-pressure The superheated steam enters the low-pressure cylinder 106 of the steam turbine through the medium-pressure steam inlet pipe 44 to perform work, and drives the second generator 107 to generate electricity. The steam turbine generator set 10 is operating under load. After the steam turbine generator set 10 does work, exhausted steam enters the condenser 11 to condense into condensed water, which is then transported to the deaerator 14 by the condensed water pump 12 for heating, and then transported to the deaerator 14 by the fifth water pump 23 The feed water preheater 15 is further heated by the waste heat of the flue gas from the low pressure steam generator 18 to form high temperature feed water.

Specifically, when the steam turbine generator set 10 reduces the operating load and reduces the required amount of steam to generate excess water supply, which is greater than the water supply required for heating the industrial steam user 20, the twelfth valve 35 is opened to utilize the hot water storage The tank 21 stores the high-temperature feed water output by the feed water preheater 15; when the steam turbine generator set 10 reduces the operating load, the required amount of steam is reduced, resulting in excess water feed, which is less than the feed water required for heating the industrial steam user 20. For the amount of water, open the fourth water pump 22 and the eleventh valve 34, and (or) open the seventh valve 30, and utilize the hot water storage tank 21 and (or) the replenishment pipe 16 to supplement the lack of water supply.

Simultaneously open the eighth valve 31, the ninth valve 32 and the tenth valve 33, and the high-temperature feed water from the feed water preheater 15 is also sent to the low-pressure steam generator 18 to be further heated by the waste heat of the flue gas from the low-pressure steam superheater 19 to form a low pressure The saturated steam is then divided into two paths and enters the deaerator 14 and the low-pressure steam superheater 19 respectively. The low-pressure saturated steam enters the deaerator 14 to heat the condensed water from the condenser 11 and the supplementary water from the supplementary water pipe 16, and the low-pressure saturated steam After the steam enters the low-pressure steam superheater 19, it is further heated by the waste heat of the flue gas from the molten salt type waste heat boiler 201 into low-pressure superheated steam, and then sent to the industrial steam user 20 for external heating, and the third water pump 13 is used as the deaerator 14 Make up water to supplement the water supply required for heating the industrial steam users 20 .

When the thermal power plant participates in power peak regulation and needs to increase the grid-connected power load, both the gas turbine unit and the steam turbine generator set 10 maintain high-load operation, and the operating load of the steam turbine generator set 10 is continuously increased through the heat release of the molten salt heat storage device, thereby increasing On-grid electricity load, while the molten salt in the high-temperature molten salt storage tank 5 releases heat and also performs heat exchange. At this time: operating circuit three, the third valve 26, the fourth valve 27, the fifth valve 28, and the sixth valve 29 , the low temperature molten salt pump 4 and the high temperature molten salt pump 6 are turned on, the molten salt low temperature heater 202, the molten salt high temperature heater 203, the high temperature molten salt bypass pipe 9, the molten salt steam heat exchange mechanism 7 and the low temperature molten salt bypass pipe 8 forms a closed circuit, and the low-temperature molten salt storage tank 3 and the high-temperature molten salt storage tank 5 participate in use. Specifically, the thirteenth valve 36, the fourteenth valve 37, the fifteenth valve 38, and the sixteenth valve 39 are opened at the same time, The high-temperature molten salt from the molten salt high-temperature heater 203 merges with the high-temperature molten salt from the high-temperature molten salt storage tank 5 and enters the molten salt steam heat exchange mechanism 7, which is increased by heat release to the molten salt steam heat exchange mechanism 7 The amount of high-temperature molten salt, thereby increasing the amount of superheated steam delivered by the molten salt steam heat exchange mechanism 7 to the steam turbine generator set 10, to further increase the operating load of the steam turbine generator set 10, and the high-temperature molten salt after being cooled by the high-pressure superheater 71 is divided into two channels. Enter the high-pressure steam drum 72 and the medium-pressure superheater 73 for the second-stage cooling, and the high-temperature molten salt cooled by the high-pressure steam drum 72 and the medium-pressure superheater 73 merges and then enters the medium-pressure steam drum 74 for the third-stage cooling, and finally The formation of low-temperature molten salt is divided into two paths, one path is returned to the low-temperature molten salt storage tank 3 for storage, and the other path is returned to the molten salt type molten salt waste heat boiler 201, followed by molten salt low temperature heater 202 and molten salt high temperature heater 203 for storage. After heating, the high-temperature molten salt is formed and then merged with the high-temperature molten salt output from the high-temperature molten salt storage tank 5 and then returned to the high-pressure superheater 71 .

Open the seventeenth valve 40 and the eighteenth valve 41 at the same time, the high-temperature feed water from the feed water preheater 15 is transported by the first water pump 75 to the high-pressure steam drum 72 to be heated to form high-pressure saturated steam, and then the high-pressure saturated steam enters the high-pressure superheater 71 is further heated to form high-pressure superheated steam, and then the high-pressure superheated steam enters the middle and high-pressure cylinder 105 of the steam turbine and the low-pressure cylinder 106 of the steam turbine through the high-pressure steam inlet pipe 43 to perform work to drive the second generator 107 to generate electricity, and at the same time, it comes from the feed water preheating The high-temperature feed water of the device 15 is sent to the medium-pressure steam drum 74 by the second water pump 76 to be heated to form medium-pressure saturated steam, and the medium-pressure saturated steam enters the medium-pressure superheater 73 to be further heated to form medium-pressure superheated steam, and then medium-pressure The superheated steam enters the low-pressure cylinder 106 of the steam turbine through the medium-pressure steam inlet pipe 44 and performs work to drive the second generator 107 to generate electricity. The steam turbine generator set 10 is operating under load. After the steam turbine generator set 10 does work, exhausted steam enters the condenser 11 to condense into condensed water, which is then transported to the deaerator 14 by the condensed water pump 12 for heating, and then transported to the deaerator 14 by the fifth water pump 23 The feed water preheater 15 is further heated by the waste heat of the flue gas from the low pressure steam generator 18 to form high temperature feed water. When the amount of circulating water is insufficient, the seventh valve 30 is opened at the same time, and the water replenishment pipe 16 is replenished.

Specifically, the fourth water pump 22 and the eleventh valve 34 are opened, and (or) the seventh valve 30 is opened, and the hot water storage tank 21 and (or) the water supply pipe 16 are used to supplement the heat supply required for the industrial steam user 20. The amount of feed water and the amount of feed water required by the increase of the operating load of the steam turbine generator set 10 increases the required amount of steam.

Simultaneously open the eighth valve 31, the ninth valve 32 and the tenth valve 33, and the high-temperature feed water from the feed water preheater 15 is also sent to the low-pressure steam generator 18 to be further heated by the waste heat of the flue gas from the low-pressure steam superheater 19 to form a low pressure The saturated steam is then divided into two paths and enters the deaerator 14 and the low-pressure steam superheater 19 respectively. The low-pressure saturated steam enters the deaerator 14 to heat the condensed water from the condenser 11 and the supplementary water from the supplementary water pipe 16, and the low-pressure saturated steam After the steam enters the low-pressure steam superheater 19, it is further heated by the waste heat of the flue gas from the molten salt type waste heat boiler 201 into low-pressure superheated steam, and then sent to the industrial steam user 20 for external heating, and the third water pump 13 is used as the deaerator 14 Make up water to supplement the water supply required for heating the industrial steam users 20 .

There is also a special case, when the thermal power plant participates in power peak regulation and needs to deeply reduce the grid load, the gas turbine generator set 1 still maintains high-load operation, and the steam turbine generator set 10 operates at zero load. During the operation, the molten salt heat storage The heat exchange device does not participate in the heat exchange process, but only stores heat, and all the molten salt that absorbs the waste heat of the flue gas is stored; specifically, in the fourth operation circuit, the first valve 24, the second valve 25 and the low-temperature molten salt pump 4 are opened, and the low-temperature Molten salt storage tank 3, molten salt low-temperature heater 202, molten salt high-temperature heater 203 and high-temperature molten salt storage tank 5 form a one-way circuit, molten salt only participates in the heat storage process, steam turbine generator set 10 does not operate, feed water preheater 15. The low-pressure steam generator 18 and the low-pressure steam superheater 19 are in operation, still supplying steam to the industrial steam users 20.

The above-mentioned embodiment is only a preferred embodiment of the present invention, and cannot be used to limit the protection scope of the present invention. Any insubstantial changes and substitutions made by those skilled in the art on the basis of the present invention belong to the scope of the present invention. Scope of protection claimed.

Claims (10)

1. A high-temperature molten salt heat storage coupled gas-fired power generation peak-shaving system, characterized in that it includes a gas turbine generator set, a flue gas heat exchange device, a molten salt heat storage heat exchange device, a steam turbine generator set, and a circulating waterway; The molten salt heat storage and heat exchange device includes a low temperature molten salt storage tank, a low temperature molten salt pump, a high temperature molten salt storage tank, a high temperature molten salt pump and a molten salt steam heat exchange mechanism; The flue gas outlet of the gas turbine generator set communicates with the flue gas inlet of the flue gas heat exchange device, the low-temperature molten salt storage tank, the flue gas heat exchange device, the high-temperature molten salt storage tank and the The molten salt steam heat exchange mechanism is sequentially connected to form a circulating heat storage heat exchange circuit, and the low-temperature molten salt pump is installed at the molten salt inlet of the flue gas heat exchange device, and the high-temperature molten salt pump is installed at the high-temperature molten salt The molten salt outlet of the storage tank; the steam turbine generator set, the molten salt steam heat exchange mechanism and the circulating waterway are connected in sequence to form a steam cycle power generation circuit, and the steam generated by the steam turbine generator set and the molten salt steam heat exchange mechanism export connectivity; A low-temperature molten salt bypass pipe is connected between the molten salt inlet and the molten salt outlet of the low-temperature molten salt storage tank, and a low-temperature molten salt bypass pipe is connected between the molten salt inlet of the high-temperature molten salt storage tank and the molten salt outlet of the high-temperature molten salt pump. It is connected with a high temperature molten salt bypass pipe. 2. The gas-fired power generation peak shaving system according to claim 1, wherein the molten salt steam heat exchange mechanism includes a high-pressure superheater, a high-pressure steam drum, a medium-pressure superheater and a medium-pressure steam drum; The molten salt outlet of the high-pressure superheater is connected with the molten salt inlet of the high-pressure steam drum and the molten salt inlet of the medium-pressure superheater, and the molten salt inlet of the medium-pressure steam drum is connected with the high-pressure steam drum. The molten salt outlet of the medium pressure superheater is connected with the molten salt outlet of the medium pressure superheater, the molten salt inlet of the high pressure superheater is connected with the molten salt outlet of the high temperature molten salt pump, and the molten salt outlet of the medium pressure drum is connected with the The molten salt inlet of the low-temperature molten salt storage tank is connected; The water inlet of the high-pressure steam drum is provided with a first water pump, the water inlet of the medium-pressure steam drum is provided with a second water pump, and the water outlets of the circulating waterway are all communicated with the first water pump and the second water pump , the steam outlet of the high-pressure steam drum communicates with the steam inlet of the high-pressure superheater, the steam outlet of the medium-pressure steam drum communicates with the steam inlet of the medium-pressure superheater, and the high-pressure superheater The steam outlet of the steam outlet and the steam outlet of the medium-pressure superheater communicate with the high-pressure steam inlet and the medium-low pressure steam inlet of the steam turbine generating set respectively. 3. The gas-fired power generation peak shaving system according to claim 1, wherein the flue gas heat exchange device includes a molten salt waste heat boiler, a molten salt low temperature heater and a molten salt high temperature heater, and the molten salt low temperature The heater and the molten salt high temperature heater are arranged in the molten salt waste heat boiler, the low temperature molten salt storage tank, the molten salt low temperature heater, the molten salt high temperature heater and the high temperature molten salt The storage tanks are connected sequentially. 4. The peak shaving system for gas-fired power generation according to claim 1, wherein the circulating water circuit includes a condenser, a condensed water pump, a third water pump, a deaerator, a fifth water pump and a feed water preheater, and the The exhaust steam inlet of the condenser is communicated with the steam exhaust port of the steam turbine generator set, and the condenser, the condensate pump, the deaerator, the fifth water pump and the feed water preheater are communicated in sequence , the water outlet of the feed water preheater communicates with the water inlet of the molten salt steam heat exchange mechanism, the water inlet of the deaerator communicates with a water supply pipe, and the third water pump is arranged on the water supply pipe. 5. The gas-fired power generation peak-shaving system according to claim 4, characterized in that the flue gas outlet of the flue gas heat exchange device is also connected to a low-pressure steam generator, and the water inlet of the low-pressure steam generator is connected to the The water outlet of the feedwater preheater is connected, the flue gas inlet of the feedwater preheater is connected with the flue gas outlet of the low-pressure steam generator, and the steam inlet of the deaerator is connected with the steam outlet of the low-pressure steam generator connected. 6. The peak shaving system for gas-fired power generation according to claim 5, characterized in that the flue gas outlet of the flue gas heat exchange device is also connected to a low-pressure steam superheater, and the flue gas outlet of the low-pressure steam superheater is connected to the The flue gas inlet of the low-pressure steam generator is connected, the steam outlet of the low-pressure steam generator is connected with the steam inlet of the low-pressure steam superheater, and the steam outlet of the low-pressure steam superheater is also connected with industrial steam users. 7. The peak shaving system for gas-fired power generation according to claim 5, wherein the circulating waterway further includes a hot water storage tank, the water outlet of the hot water storage tank is connected to a fourth water pump, and the hot water storage tank The water inlet of the tank communicates with the water outlet of the feed water preheater, and the water outlet of the fourth water pump communicates with the water inlet of the molten salt steam heat exchange mechanism and the water inlet of the low-pressure steam generator. 8. An operation method of the high-temperature molten salt heat storage coupled gas-fired power generation peak-shaving system according to any one of claims 1-7, characterized in that it comprises: When the thermal power plant does not participate in power peak regulation, both the gas turbine generator set and the steam turbine generator set maintain high-load operation to ensure high-efficiency operation of the thermal power plant. During operation, the molten salt heat storage and heat exchange device only participates in The heat exchange process does not participate in heat storage and heat release. The molten salt only heats the circulating water into steam by transporting the waste heat of the flue gas; When the thermal power plant participates in power peak regulation and needs to reduce the grid load, the gas turbine generator set still maintains high-load operation, and reduces the operating load of the steam turbine generator set to reduce the grid load. During operation, the molten salt storage The heat exchange device participates in the heat exchange process and also participates in heat storage. Part of the molten salt transports the waste heat of the flue gas to heat the circulating water into steam, and a part of the molten salt with the waste heat of the flue gas is stored; When the thermal power plant participates in power peak regulation and needs to increase the on-grid power load, the gas turbine generator set still maintains high-load operation, and increases the operating load of the steam turbine generator set to increase the on-grid power load. During operation, the molten salt storage The heat exchange device participates in the heat exchange process and also participates in heat release. A part of the molten salt transports the residual heat of the flue gas to heat the circulating water into steam, and a part of the stored molten salt with the residual heat of the flue gas releases heat to heat the circulating water into steam; When the thermal power plant participates in power peak regulation and needs to deeply reduce the grid power load, the gas turbine generator set still maintains high-load operation, and the steam turbine generator set operates at zero load. During operation, the molten salt heat storage and heat exchange The device does not participate in the heat exchange process, but only stores heat, and all the molten salt that absorbs the waste heat of the flue gas is stored. 9. The operating method of the gas-fired power generation peak-shaving system according to claim 8, characterized in that, when the thermal power plant participates in power peak-shaving and needs to reduce the grid load, the high-temperature molten salt from the flue gas heat exchange device is divided into two routes , one way enters the high-temperature molten salt storage tank for heat storage, the high-temperature molten salt pump is not running, and the other way enters the molten salt steam heat exchange mechanism through the high-temperature molten salt bypass pipe, and the circulating water in it Perform heat exchange, heat into steam, and then enter the steam turbine generator set to generate electricity, and finally the formed low-temperature molten salt enters the low-temperature molten salt bypass pipe and merges with the low-temperature molten salt output from the low-temperature molten salt storage tank, Driven by the low-temperature molten salt pump, it enters the flue gas heat exchange device for heating to form high-temperature molten salt for recycling, and then enters the high-temperature molten salt storage tank for storage and enters the molten salt for heat exchange. The heating device is recycled. 10. The operating method of the gas-fired power generation peak-shaving system according to claim 8, characterized in that, when the thermal power plant participates in power peak-shaving and needs to increase the grid load, the high-temperature molten salt from the flue gas heat exchange device passes through the The high-temperature molten salt bypass pipe merges with the high-temperature molten salt from the high-temperature molten salt storage tank under the action of the high-temperature molten salt pump and enters the molten salt steam heat exchange mechanism together to exchange with the circulating water therein. heat, heated into steam, then enters the steam turbine generator set to generate electricity, and finally forms low-temperature molten salt, which is divided into two paths, one path is returned to the low-temperature molten salt storage tank for storage, and the other path passes through the low-temperature molten salt bypass pipe, Driven by the low-temperature molten salt pump, it enters the flue gas heat exchange device for reheating to form high-temperature molten salt for recycling.

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