CN111928228A - Power station boiler high-temperature flue gas coupling reheat steam heat storage deep peak regulation system and method - Google Patents
Power station boiler high-temperature flue gas coupling reheat steam heat storage deep peak regulation system and method Download PDFInfo
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- CN111928228A CN111928228A CN202010917835.9A CN202010917835A CN111928228A CN 111928228 A CN111928228 A CN 111928228A CN 202010917835 A CN202010917835 A CN 202010917835A CN 111928228 A CN111928228 A CN 111928228A
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- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 41
- 239000003546 flue gas Substances 0.000 title claims abstract description 41
- 238000005338 heat storage Methods 0.000 title claims abstract description 19
- 230000008878 coupling Effects 0.000 title claims abstract description 15
- 238000010168 coupling process Methods 0.000 title claims abstract description 15
- 238000005859 coupling reaction Methods 0.000 title claims abstract description 15
- 238000000034 method Methods 0.000 title claims abstract description 11
- 150000003839 salts Chemical class 0.000 claims abstract description 105
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 41
- 230000001105 regulatory effect Effects 0.000 claims description 70
- 238000003303 reheating Methods 0.000 claims description 33
- 238000010521 absorption reaction Methods 0.000 claims description 17
- 238000010438 heat treatment Methods 0.000 claims description 8
- 238000010248 power generation Methods 0.000 claims description 8
- 230000005611 electricity Effects 0.000 claims description 6
- 230000008859 change Effects 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B33/00—Steam-generation plants, e.g. comprising steam boilers of different types in mutual association
- F22B33/18—Combinations of steam boilers with other apparatus
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D15/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
- F01D15/10—Adaptations for driving, or combinations with, electric generators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K11/00—Plants characterised by the engines being structurally combined with boilers or condensers
- F01K11/02—Plants characterised by the engines being structurally combined with boilers or condensers the engines being turbines
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B35/00—Control systems for steam boilers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
- F22D1/00—Feed-water heaters, i.e. economisers or like preheaters
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22G—SUPERHEATING OF STEAM
- F22G1/00—Steam superheating characterised by heating method
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- General Engineering & Computer Science (AREA)
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- Combustion & Propulsion (AREA)
- Engine Equipment That Uses Special Cycles (AREA)
Abstract
The invention discloses a power station boiler high-temperature flue gas coupling reheat steam heat storage deep peak regulation system and a method, wherein the system comprises a boiler, a low-temperature molten salt tank, a molten salt reheat steam heat exchanger, a high-temperature molten salt tank, a heat supply network water return pipeline, a heat supply network water supply pipeline, a low-temperature reheat steam input pipeline, a low-temperature reheater inlet header, a steam turbine and a generator.
Description
Technical Field
The invention belongs to the field of deep peak regulation of thermal power plants, and relates to a system and a method for deep peak regulation of heat storage of high-temperature flue gas coupled reheat steam of a power station boiler.
Background
With the change of national power policy in recent years, the main functions of the thermal power plant are changed at the same time, and the main power of power supply is changed into the main power of power supply to participate in the deep peak regulation in cooperation with a power grid. Meanwhile, the policy of subsidizing the electricity price of the advanced peak regulation of the national platform greatly stimulates the enthusiasm of the thermal power plant for carrying out the advanced peak regulation reconstruction of the unit. At present, thermal power faces the risk of excess of productivity and structurality, and new energy faces great consumption pressure. The thermal power is bound to give way for new energy development. Thermal power generating units are subject to deep peaking. For the 'three north' area, the wind-fire contradiction of the heating period is particularly prominent, the period with the best wind power resource is the winter heating period, in addition, the proportion of the provincial thermoelectric units is too high, peak-shaving power sources of other categories are relatively deficient, the continuously increased heating demand and the continuously increased clean energy installation are caused, and the peak-shaving space is very limited. Particularly, in northeast regions, most thermal power is combined heat and power generation units, the peak regulation capacity is only 10%, new energy storage consumption and new energy increment development are influenced, and a hard gap of the peak regulation capacity causes severe electricity limitation of new energy in partial regions, so that the thermoelectric units can realize deep peak regulation only through transformation.
At present, a unit participating in deep peak shaving runs for a long time deviating from a design value, so that the safety and the economy of the unit are reduced. From the technology and the practice of transformation, the transformed unit has the safety problems of boiler low-load stable combustion and hydrodynamic circulation, the full-load investment of a denitration device and the low-load cooling of a steam turbine, the flexibility problem of a control system during long-term low load and quick load change, the problem of equipment operation cycle and service life attenuation, the problems of heat supply unit thermoelectric decoupling and the like to different degrees, and further attack, optimization and solution are needed. The system and the method for deeply regulating the peak of the heat storage of the high-temperature flue gas coupled with the reheat steam of the power station boiler have the advantages of simplicity, low investment, high potential of deep peak regulation and the like, and the deep peak regulation of the thermal power plant unit is realized.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a power station boiler high-temperature flue gas coupled reheat steam heat storage deep peak regulation system and a method thereof, which meet the requirement of flexible deep peak regulation of a thermal power plant unit and have the characteristics of simple system, low investment cost and large deep peak regulation potential.
In order to achieve the purpose, the power station boiler high-temperature flue gas coupling reheating steam heat storage depth peak regulation system comprises a boiler, a low-temperature molten salt tank, a molten salt reheating steam heat exchanger, a high-temperature molten salt tank, a heat supply network water return pipeline, a heat supply network water supply pipeline, a low-temperature reheating steam input pipeline, a low-temperature reheater inlet header, a steam turbine and a generator;
a wall type low-temperature reheater, a medium-temperature reheater, a high-temperature reheater, a fused salt high-temperature flue gas heat exchanger, a low-temperature superheater, an economizer and an air preheater are sequentially arranged in the boiler along the flow direction of flue gas;
the outlet of the low-temperature molten salt tank is communicated with the heat-releasing side inlet of the high-temperature molten salt tank through the heat-absorbing sides of the molten salt high-temperature flue gas heat exchanger and the molten salt reheating steam heat exchanger, and the heat-releasing side outlet of the high-temperature molten salt tank is communicated with the inlet of the low-temperature molten salt tank;
an outlet of the heat supply network water return pipeline is communicated with a heat absorption side inlet of the high-temperature molten salt tank, and a heat absorption side outlet of the high-temperature molten salt tank is communicated with a heat supply network water supply pipeline;
the low-temperature reheating steam input pipeline is communicated with a low-temperature reheater inlet header, an outlet of the low-temperature reheater inlet header is divided into two paths through a wall type low-temperature reheater, a medium-temperature reheater and a high-temperature reheater, one path is communicated with a steam turbine, the other path is communicated with an inlet of the low-temperature reheater inlet header through a heat releasing side of a fused salt reheating steam heat exchanger, and the steam turbine is connected with a generator.
The outlet of the low-temperature molten salt tank is communicated with the inlet of the low-temperature molten salt tank through a first circulating pump, a first regulating valve, a molten salt high-temperature flue gas heat exchanger, a second regulating valve, the heat absorption side of a molten salt reheating steam heat exchanger, a second circulating pump, a high-temperature molten salt tank, a third regulating valve and a third circulating pump.
The outlet of the high-temperature reheater is divided into two paths, wherein one path is communicated with the steam turbine through a fourth regulating valve, and the other path is communicated with the heat release side of the fused salt reheating steam heat exchanger through a fifth regulating valve.
And a sixth regulating valve is arranged on the heat supply network water return pipeline, and a seventh regulating valve is arranged on the heat supply network water supply pipeline.
The boiler water supply system is characterized by further comprising a boiler water supply pipeline and an eighth regulating valve arranged on the boiler water supply pipeline, wherein the boiler water supply pipeline is communicated with a heat absorption side inlet of the high-temperature molten salt tank.
The system also comprises an economizer inlet pipeline and a ninth regulating valve arranged on the economizer inlet pipeline, wherein the economizer inlet pipeline is communicated with the heat absorption side outlet of the high-temperature molten salt tank.
A method for deeply regulating peak of heat storage of high-temperature flue gas coupled with reheat steam of a power station boiler comprises the following steps:
when the thermal power generating unit needs deep peak shaving, a second regulating valve and a first regulating valve are opened, molten salt in a low-temperature molten salt tank enters a molten salt high-temperature flue gas heat exchanger through a first circulating pump to absorb heat of high-temperature flue gas, and then is sent into a high-temperature molten salt tank through a second circulating pump to store heat, meanwhile, a fourth regulating valve and a fifth regulating valve are opened, steam output by a high-temperature reheater is divided into two paths, wherein one path is sent into a steam turbine to drive a generator to generate electricity; the other path of the heat is sent into a fused salt reheating steam heat exchanger to exchange heat with fused salt, and the reheated steam after heat exchange is sent into a low-temperature reheater inlet header to be mixed with the low-temperature reheated steam and then enters a wall type low-temperature reheater, a medium-temperature reheater and a high-temperature reheater to absorb heat and raise temperature;
when the power generation and supply requirements of the thermal power generating unit increase, the fifth regulating valve, the second regulating valve and the first regulating valve are closed, the third regulating valve, the sixth regulating valve and the seventh regulating valve are opened, the return water of the heat supply network enters the high-temperature molten salt tank for heat exchange and temperature rise, then heat supply is carried out, at the moment, all heat generated by the boiler is used for heating working medium water, all generated steam enters the steam turbine to drive the generator to generate power, and the generated energy of the generator is improved.
The invention has the following beneficial effects:
when the power station boiler high-temperature flue gas coupling reheating steam heat storage deep peak regulation system and the method are operated specifically, when a unit needs deep peak regulation, molten salt in a low-temperature molten salt tank is sent to a molten salt high-temperature flue gas heat exchanger to absorb heat of high-temperature flue gas, then the heat is stored in the high-temperature molten salt tank, and meanwhile, part of steam output by a high-temperature reheater is sent to the molten salt reheating steam heat exchanger to release heat, so that the amount of steam entering a steam turbine is reduced, and the power generation amount of a generator is reduced; when the power generation and supply requirements of the thermal power generating unit are increased, heat generated by the boiler is completely used for heating working medium water, generated steam completely enters the steam turbine to drive the generator to generate power, the generated energy of the generator is improved, high-temperature molten salt in the high-temperature molten salt tank is used for heating return water of a heat supply network, the requirement on heat supply is met, the requirement on flexible deep peak regulation of the thermal power generating unit is met, and the method has the advantages of being simple in system, low in investment cost and high in deep peak regulation potential.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Wherein, 1 is a boiler, 2 is a wall type low-temperature reheater, 3 is a medium-temperature reheater, 4 is a high-temperature reheater, 5 is a low-temperature superheater, 6 is an economizer, 7 is an air preheater, 8 is a steam turbine, 9 is a generator, 10 is a low-temperature reheater inlet header, 11 is a molten salt high-temperature flue gas heat exchanger, 12 is a molten salt reheating steam heat exchanger, 13 is a second circulating pump, 14 is a high-temperature molten salt tank, 15 is a third circulating pump, 16 is a low-temperature molten salt tank, 17 is a first circulating pump, 18 is a fourth regulating valve, 19 is a fifth regulating valve, 20 is a second regulating valve, 21 is a first regulating valve, 22 is a third regulating valve, 23 is an eighth regulating valve, 24 is a sixth regulating valve, 25 is a seventh regulating valve, and 26 is a ninth regulating valve.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings:
referring to fig. 1, the power station boiler high-temperature flue gas coupling reheating steam heat storage depth peak regulation system comprises a boiler 1, a low-temperature molten salt tank 16, a molten salt reheating steam heat exchanger 12, a high-temperature molten salt tank 14, a heat supply network water return pipeline, a heat supply network water supply pipeline, a low-temperature reheating steam input pipeline, a low-temperature reheater inlet header 10, a steam turbine 8 and a generator 9; a wall type low-temperature reheater 2, a medium-temperature reheater 3, a high-temperature reheater 4, a molten salt high-temperature flue gas heat exchanger 11, a low-temperature superheater 5, an economizer 6 and an air preheater 7 are sequentially arranged in the boiler 1 along the flow direction of flue gas; an outlet of the low-temperature molten salt tank 16 is communicated with a heat release side inlet of the high-temperature molten salt tank 14 through a heat absorption side of the molten salt high-temperature flue gas heat exchanger 11 and the molten salt reheating steam heat exchanger 12, and a heat release side outlet of the high-temperature molten salt tank 14 is communicated with an inlet of the low-temperature molten salt tank 16; an outlet of the heat supply network water return pipeline is communicated with a heat absorption side inlet of the high-temperature molten salt tank 14, and a heat absorption side outlet of the high-temperature molten salt tank 14 is communicated with a heat supply network water supply pipeline; the low-temperature reheating steam input pipeline is communicated with a low-temperature reheater inlet header 10, the outlet of the low-temperature reheater inlet header 10 is divided into two paths after passing through a wall type low-temperature reheater 2, a medium-temperature reheater 3 and a high-temperature reheater 4, one path of the two paths is communicated with a steam turbine 8, the other path of the two paths is communicated with the inlet of the low-temperature reheater inlet header 10 through the heat releasing side of a molten salt reheating steam heat exchanger 12, and the steam turbine 8 is connected with a generator 9.
The outlet of the low-temperature molten salt tank 16 is communicated with the inlet of the low-temperature molten salt tank 16 through a first circulating pump 17, a first regulating valve 21, a molten salt high-temperature flue gas heat exchanger 11, a second regulating valve 20, the heat absorption side of a molten salt reheating steam heat exchanger 12, a second circulating pump 13, a high-temperature molten salt tank 14, a third regulating valve 22 and a third circulating pump 15.
The outlet of the high-temperature reheater 4 is divided into two paths, wherein one path is communicated with the steam turbine 8 through a fourth regulating valve 18, and the other path is communicated with the heat release side of the molten salt reheating steam heat exchanger 12 through a fifth regulating valve 19.
A sixth regulating valve 24 is arranged on the heat supply network water return pipeline, and a seventh regulating valve 25 is arranged on the heat supply network water supply pipeline; the invention also comprises a boiler water supply pipeline and an eighth regulating valve 23 arranged on the boiler water supply pipeline, wherein the boiler water supply pipeline is communicated with the heat absorption side inlet of the high-temperature molten salt tank 14; the invention also comprises an economizer inlet pipeline and a ninth regulating valve 26 arranged on the economizer inlet pipeline, wherein the economizer inlet pipeline is communicated with the heat absorption side outlet of the high-temperature molten salt tank 14.
The invention relates to a high-temperature flue gas coupling reheating steam heat storage deep peak shaving method for a power station boiler, which comprises the following steps of:
when the thermal power generating unit needs deep peak shaving, the second regulating valve 20 and the first regulating valve 21 are opened, molten salt (180-200 ℃) in the low-temperature molten salt tank 16 enters the molten salt high-temperature flue gas heat exchanger 11 through the first circulating pump 17 to absorb heat of high-temperature flue gas (the flue gas temperature is 550-600 ℃) so that the low-temperature molten salt is heated to 400 ℃, and then the molten salt is sent into the high-temperature molten salt tank 14 through the second circulating pump 13 to store heat, so that the heat absorption capacity of the low-temperature superheater 5 at the tail part of the boiler 1, the economizer 6 and the air preheater 7 is reduced, the flow of main steam of the boiler is reduced, and the.
Meanwhile, on the basis, the fourth regulating valve 18 and the fifth regulating valve 19 are opened, and a part of steam (540 ℃ and 1.3Mpa) output by the high-temperature reheater 4 is sent into the steam turbine 8 to drive the generator 9 to generate electricity; and the other part of the molten salt is sent into a molten salt reheating steam heat exchanger 12 to exchange heat with the molten salt at the temperature of 400 ℃, the molten salt is heated to 480-500 ℃, the temperature of the reheated steam after heat exchange is 280-300 ℃, then the molten salt is sent into a low-temperature reheater inlet header 10 to be mixed with the low-temperature reheated steam, and then the mixed steam enters a wall type low-temperature reheater 2, a medium-temperature reheater 3 and a high-temperature reheater 4 to absorb heat and raise the temperature.
When the power generation and supply requirements of the thermal power generating unit are large, the fifth regulating valve 19, the second regulating valve 20 and the first regulating valve 21 are closed, the third regulating valve 22, the eighth regulating valve 23 or the sixth regulating valve 24, the ninth regulating valve 26 or the seventh regulating valve 25 are opened, the return water of the heat supply network (50 ℃) enters the high-temperature molten salt tank 14 for heat exchange, the water of the heat supply network is heated to 100 ℃ for heat supply to reduce the air extraction quantity of the steam turbine 8 and improve the power generation quantity of the generator 9, or the water (150 ℃) supplied by the boiler 1 is sent into the high-temperature molten salt tank 14 for heat exchange, the water supplied by the boiler 1 is heated to 200 ℃ and then sent into the economizer 6, the air extraction of the steam turbine 8 is reduced, and the power generation quantity of the generator 9 is.
At the moment, all heat generated by the boiler 1 is used for heating working medium water, and all generated steam enters the steam turbine 8 to drive the generator 9 to generate electricity, so that the generating capacity of the generator 9 is improved.
Claims (7)
1. A power station boiler high-temperature flue gas coupling reheat steam heat storage depth peak regulation system is characterized by comprising a boiler (1), a low-temperature molten salt tank (16), a molten salt reheat steam heat exchanger (12), a high-temperature molten salt tank (14), a heat supply network water return pipeline, a heat supply network water supply pipeline, a low-temperature reheat steam input pipeline, a low-temperature reheater inlet header (10), a steam turbine (8) and a generator (9);
a wall type low-temperature reheater (2), a medium-temperature reheater (3), a high-temperature reheater (4), a fused salt high-temperature flue gas heat exchanger (11), a low-temperature superheater (5), an economizer (6) and an air preheater (7) are sequentially arranged in the boiler (1) along the flow direction of flue gas;
an outlet of the low-temperature molten salt tank (16) is communicated with a heat-releasing side inlet of the high-temperature molten salt tank (14) through a heat-absorbing side of the molten salt high-temperature flue gas heat exchanger (11) and the molten salt reheating steam heat exchanger (12), and a heat-releasing side outlet of the high-temperature molten salt tank (14) is communicated with an inlet of the low-temperature molten salt tank (16);
an outlet of the heat supply network water return pipeline is communicated with a heat absorption side inlet of the high-temperature molten salt tank (14), and a heat absorption side outlet of the high-temperature molten salt tank (14) is communicated with a heat supply network water supply pipeline;
the low-temperature reheating steam input pipeline is communicated with a low-temperature reheater inlet header (10), an outlet of the low-temperature reheater inlet header (10) is divided into two paths after passing through a wall type low-temperature reheater (2), a medium-temperature reheater (3) and a high-temperature reheater (4), one path is communicated with a steam turbine (8), the other path is communicated with an inlet of the low-temperature reheater inlet header (10) through a heat release side of a molten salt reheating steam heat exchanger (12), and the steam turbine (8) is connected with a generator (9).
2. The power station boiler high-temperature flue gas coupling reheating steam heat storage depth peak regulation system of claim 1, wherein an outlet of a low-temperature molten salt tank (16) is communicated with an inlet of the low-temperature molten salt tank (16) through a first circulating pump (17), a first regulating valve (21), a molten salt high-temperature flue gas heat exchanger (11), a second regulating valve (20), a heat absorption side of a molten salt reheating steam heat exchanger (12), a second circulating pump (13), a high-temperature molten salt tank (14), a third regulating valve (22) and a third circulating pump (15).
3. The power station boiler high-temperature flue gas coupling reheating steam heat storage depth peak regulation system as claimed in claim 2, characterized in that the outlet of the high-temperature reheater (4) is divided into two paths, wherein one path is communicated with the steam turbine (8) through a fourth regulating valve (18), and the other path is communicated with the heat release side of the molten salt reheating steam heat exchanger (12) through a fifth regulating valve (19).
4. The power station boiler high-temperature flue gas coupling reheating steam heat storage depth peak regulation system as claimed in claim 3, wherein a sixth regulating valve (24) is arranged on a heat supply network water return pipeline, and a seventh regulating valve (25) is arranged on a heat supply network water supply pipeline.
5. The power station boiler high-temperature flue gas coupling reheating steam heat storage depth peak regulation system as claimed in claim 4, further comprising a boiler water supply pipeline and an eighth regulating valve (23) arranged on the boiler water supply pipeline, wherein the boiler water supply pipeline is communicated with a heat absorption side inlet of the high-temperature molten salt tank (14).
6. The power station boiler high-temperature flue gas coupling reheating steam heat storage depth peak regulation system as claimed in claim 5, further comprising an economizer inlet pipeline and a ninth regulating valve (26) arranged on the economizer inlet pipeline, wherein the economizer inlet pipeline is communicated with a heat absorption side outlet of the high-temperature molten salt tank (14).
7. A power station boiler high-temperature flue gas coupling reheat steam heat storage deep peak shaving method is characterized in that the power station boiler high-temperature flue gas coupling reheat steam heat storage deep peak shaving system based on claim 3 comprises the following steps:
when the thermal power generating unit needs deep peak shaving, a second regulating valve (20) and a first regulating valve (21) are opened, molten salt in a low-temperature molten salt tank (16) enters a molten salt high-temperature flue gas heat exchanger (11) through a first circulating pump (17) to absorb heat of high-temperature flue gas, then the molten salt is sent into a high-temperature molten salt tank (14) through a second circulating pump (13) to store heat, meanwhile, a fourth regulating valve (18) and a fifth regulating valve (19) are opened, steam output by a high-temperature reheater (4) is divided into two paths, and one path of the steam is sent into a steam turbine (8) to drive a generator (9) to generate electricity; the other path of the heat is sent into a fused salt reheating steam heat exchanger (12) to exchange heat with fused salt, and the reheated steam after heat exchange is sent into a low-temperature reheater inlet header (10) to be mixed with the low-temperature reheated steam, and then enters a wall type low-temperature reheater (2), a medium-temperature reheater (3) and a high-temperature reheater (4) to absorb heat and raise the temperature;
when the power generation and supply requirements of the thermal power generating unit are increased, the fifth regulating valve (19), the second regulating valve (20) and the first regulating valve (21) are closed, the third regulating valve (22), the sixth regulating valve (24) and the seventh regulating valve (25) are opened, the return water of a heat supply network enters the high-temperature molten salt tank (14) for heat exchange and temperature rise, then heat supply is carried out, at the moment, all heat generated by the boiler (1) is used for heating working medium water, all generated steam enters the steam turbine (8), so that the generator (9) is driven to generate power, and the generated energy of the generator (9) is improved.
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| CN113153465A (en) * | 2021-04-30 | 2021-07-23 | 中国电力工程顾问集团西北电力设计院有限公司 | Heat supply and power generation decoupling method and system for improving peak regulation capacity of heat supply unit |
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| CN115234328A (en) * | 2022-08-15 | 2022-10-25 | 西安西热锅炉环保工程有限公司 | Fused salt heat storage deep peak regulation system of generator set and working method thereof |
| CN115307473A (en) * | 2022-08-11 | 2022-11-08 | 西安西热锅炉环保工程有限公司 | Heat storage system and method utilizing smoke heat of coal-fired boiler |
| CN115726853A (en) * | 2022-11-08 | 2023-03-03 | 华电电力科学研究院有限公司 | Cogeneration peak regulation system and method for multi-heat-source heating molten salt energy storage |
| CN116164301A (en) * | 2023-04-04 | 2023-05-26 | 华北电力大学 | Boiler flue gas heat storage system and operation mode switching method |
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| CN115726853A (en) * | 2022-11-08 | 2023-03-03 | 华电电力科学研究院有限公司 | Cogeneration peak regulation system and method for multi-heat-source heating molten salt energy storage |
| CN115726853B (en) * | 2022-11-08 | 2024-09-20 | 华电电力科学研究院有限公司 | Combined heat and power generation peak shaving system and method for multi-heat source heating molten salt energy storage |
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