CN115234328B - Molten salt heat storage depth peak regulation system of generator set and working method thereof - Google Patents
Molten salt heat storage depth peak regulation system of generator set and working method thereof Download PDFInfo
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- CN115234328B CN115234328B CN202210974807.XA CN202210974807A CN115234328B CN 115234328 B CN115234328 B CN 115234328B CN 202210974807 A CN202210974807 A CN 202210974807A CN 115234328 B CN115234328 B CN 115234328B
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- 150000003839 salts Chemical class 0.000 title claims abstract description 492
- 238000005338 heat storage Methods 0.000 title claims abstract description 39
- 238000000034 method Methods 0.000 title claims abstract description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 74
- 238000001816 cooling Methods 0.000 claims abstract description 52
- 238000010438 heat treatment Methods 0.000 claims abstract description 38
- 230000001105 regulatory effect Effects 0.000 claims description 27
- 238000002844 melting Methods 0.000 claims description 20
- 230000008018 melting Effects 0.000 claims description 17
- 239000007788 liquid Substances 0.000 claims description 10
- 239000002826 coolant Substances 0.000 claims description 4
- 238000004146 energy storage Methods 0.000 abstract description 12
- 230000008859 change Effects 0.000 abstract description 7
- 230000004044 response Effects 0.000 abstract description 5
- 239000003245 coal Substances 0.000 description 3
- 238000010248 power generation Methods 0.000 description 3
- 239000011435 rock Substances 0.000 description 3
- 238000005345 coagulation Methods 0.000 description 2
- 238000009833 condensation Methods 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000012983 electrochemical energy storage Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000008236 heating water Substances 0.000 description 1
- 239000012943 hotmelt Substances 0.000 description 1
- 229910017053 inorganic salt Inorganic materials 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
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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
- F01K13/00—General layout or general methods of operation of complete plants
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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
- F01K13/00—General layout or general methods of operation of complete plants
- F01K13/02—Controlling, e.g. stopping or starting
-
- 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
- F01K21/00—Steam engine plants not otherwise provided for
-
- 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
- F01K25/00—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for
- F01K25/02—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for the fluid remaining in the liquid phase
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/14—Thermal energy storage
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- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Engine Equipment That Uses Special Cycles (AREA)
Abstract
The invention discloses a fused salt heat storage deep peak regulation system of a generator set and a working method thereof. According to the invention, a plurality of groups of fused salt electric heaters are matched to heat fused salt, so that the peak regulation requirement of the quick response of a power grid is met; the heat energy stored by the fused salt is used for heating the water supply of the generator set through the fused salt cooling system, the water supply temperature is always higher than the lowest use temperature of the fused salt, the self-anticoagulation function is realized, no phase change exists in cold and hot media, and the system is simple and high in reliability; the existing high-efficiency steam turbine generator unit of the generator unit is utilized, the heat consumption is reduced, and higher energy storage efficiency is obtained. The fused salt heat storage deep peak regulation system of the generator set can realize deep peak regulation of the generator set with large capacity, long time, high safety and low cost, and the cold and hot medium has no phase change.
Description
Technical Field
The invention belongs to the technical field of energy storage, and particularly relates to a fused salt heat storage depth peak regulation system of a generator set and a working method thereof.
Background
In order to construct a novel power grid mainly based on new energy, the flexibility requirement of the traditional generator set is higher. To further increase flexibility and regulatory capability, promote clean low-carbon conversion in the power industry, it is desirable to propose retrofit upgrade embodiments for coal electric motor sets. The flexibility of the newly built unit is required to be manufactured completely for the transformation and upgrading of the coal motor unit, and the flexibility of the stock coal motor unit is required to be improved completely. The peak regulation capacity of the unit is definitely required, the generalized requirement of the peak regulation capacity of the pure condensation working condition is that the minimum power generation output reaches 35% of rated load, the peak regulation capacity of the heating thermoelectric unit, which reaches 40% of rated load, of the minimum power generation output of 6 hours a day is realized through thermoelectric decoupling when the heating thermoelectric unit operates in a heating period, and other types of units should take measures to reduce the minimum power generation output as much as possible.
The traditional generator set has large base capacity, large energy and high quality which are required to be stored during deep peak shaving, and the existing electrochemical energy storage, hot water tank energy storage, steam extraction energy storage and the like can not meet the deep peak shaving requirement of the generator set. The reduction of the online electric quantity can realize the deep peak shaving of the generator set rapidly and deeply, and the storage of the electric energy into high-quality energy is particularly important. The fused salt heat storage is suitable for deep peak shaving of the generator set due to the advantages of large capacity, high heat energy grade and the like. The fused salt heat storage is a fused mass inorganic salt sensible heat storage, utilizes the change of fused salt temperature to store heat, and generally adopts a double-tank fused salt heat storage system. The fused salt heat storage is mainly applied to solar thermal power stations, and a fused salt heat storage peak shaving system applied to a large-scale generator set is rarely available. The fused salt heat storage is combined with a large-scale generator set, so that high-capacity, long-time, high-safety and low-cost energy storage can be realized, and the fused salt heat storage system has great significance for the development of power supply side energy storage technology. However, the existing fused salt heat storage system is usually solar heat collection and heating, a system combined with the electric energy of a generator set cannot be provided, meanwhile, the electric energy of the generator set is usually 6kV high voltage, the highest-grade voltage of the existing fused salt electric heater is less than 1kV, and no research is seen on how to effectively combine the two. In addition, the existing molten salt heat storage system generally adopts binary molten salt as a heat storage medium, the lowest use temperature is 260 ℃, the temperature is equal to the water supply temperature of the generator set in a full-load working condition, the deep peak shaving is performed in a low-load working condition, and the existing molten salt heat storage system cannot be applied.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides a fused salt heat storage deep peak regulation system of a generator set and a working method thereof, wherein the system converts electric energy into heat energy through the cooperation of a plurality of groups of fused salt electric heaters, and the water supply temperature of a fused salt cooling system is always higher than the lowest use temperature of fused salt, so that the system has a self-coagulation prevention function; the system can realize high-capacity, long-time, high-safety and low-cost energy storage, realize deep peak shaving of the generator set, heat energy stored by the system is used for heating water supply, and reduces heat consumption of the generator set.
In order to achieve the above purpose, the invention adopts the following technical scheme:
The molten salt heat storage deep peak regulation system of the generator set comprises a molten salt cooling system, a cold molten salt storage system, a molten salt heating system, a hot molten salt storage system, a power supply system and a water supply system of the generator set;
the water supply system is communicated with a water side inlet of the molten salt cooling system through a water supply main pipe, and is communicated with a water side outlet of the molten salt cooling system through a water return main pipe;
The molten salt heating system comprises a plurality of molten salt electric heaters which are connected in parallel, wherein the inlet of each molten salt electric heater is provided with a flow regulating valve and a temperature measuring point, and the outlet of each molten salt electric heater is provided with a shutoff valve and a temperature measuring point; the molten salt electric heaters are connected with a power supply system, and a temperature controller is connected between flow regulating valves at inlets of all the molten salt electric heaters and temperature measuring points at outlets of the molten salt electric heaters;
All flow regulating valves and temperature measuring points at the inlets of the molten salt electric heaters and all shutoff valves and temperature measuring points at the outlets of the molten salt electric heaters are connected with a power supply system;
The molten salt side outlets of the molten salt cooling system are connected with the molten salt inlets of the cold molten salt storage system through molten salt pipelines, the molten salt outlets of the cold molten salt storage system are connected with the inlets of all the parallel structures of the molten salt electric heaters through molten salt pipelines, the outlets of all the parallel structures of the molten salt electric heaters are connected with the molten salt inlets of the hot molten salt storage system through molten salt pipelines, and the molten salt outlets of the hot molten salt storage system are connected with the molten salt side inlets of the molten salt cooling system through molten salt pipelines;
the system comprises a molten salt cooling system, a cold melting salt storage system, a molten salt electric heater, a hot melting salt storage system, a molten salt inlet and a molten salt outlet, wherein the molten salt side outlet of the molten salt cooling system is connected with the molten salt inlet of the cold melting salt storage system, the molten salt outlet of the cold melting salt storage system is connected with the molten salt pipeline of the inlet of all the molten salt electric heaters in parallel, the molten salt pipeline of the outlet of all the molten salt electric heaters in parallel is connected with the molten salt inlet of the hot molten salt storage system, and shutoff valves are uniformly distributed on the molten salt pipeline of the molten salt outlet of the hot molten salt storage system and the molten salt side inlet of the molten salt cooling system.
Preferably, temperature measuring points, pressure measuring points and flow measuring points are arranged on a molten salt pipeline with a molten salt side outlet of a molten salt cooling system connected with a molten salt inlet of a cold molten salt storage system, a molten salt pipeline with a molten salt outlet of the cold molten salt storage system connected with inlets of all molten salt electric heaters in parallel connection, a molten salt pipeline with outlets of all molten salt electric heaters in parallel connection connected with a molten salt inlet of a hot molten salt storage system, and a molten salt pipeline with a molten salt outlet of the hot molten salt storage system connected with a molten salt side inlet of the molten salt cooling system.
Preferably, one end of the water supply main pipe is communicated with a water side inlet of the molten salt cooling system, the other end of the water supply main pipe is connected with a first water supply branch pipe and a second water supply branch pipe, the inlet of the first water supply branch pipe is arranged at the inlet of one-stage or multi-stage high-pressure heater of the water supply system, the inlet of the second water supply branch pipe is arranged at the outlet of one-stage or multi-stage high-pressure heater of the water supply system, a flow regulating valve group is arranged on the first water supply branch pipe, and a shutoff valve is arranged on the second water supply branch pipe.
Preferably, the molten salt cooling system adopts a molten salt heater, the molten salt heater adopts a shell-and-tube heat exchanger or a plate heat exchanger, a safety valve, a high-point air release port and a low-point drain outlet are arranged on the molten salt cooling medium side and the molten salt heating medium side of the heat exchanger, the low-point drain outlet on the molten salt cooling medium side and the molten salt heating medium side is connected to an inlet of a cold molten salt storage system or a salt-thinning tank, the low-point drain outlet is higher than the inlet of the cold molten salt storage system and the salt-thinning tank, and molten salt can automatically flow to the molten salt cooling tank or the salt-thinning tank by gravity.
Preferably, the cold molten salt storage system comprises a salt melting tank and a cold molten salt storage tank, wherein the salt melting tank and the cold molten salt storage tank are respectively provided with a liquid level measuring point, a temperature measuring point and an exhaust point; the salt outlet of the salt melting tank is communicated with the inlet of the cold molten salt storage tank, and the inlet of the cold molten salt storage tank is connected with the side outlet of molten salt of the molten salt cooling system through a molten salt pipeline; the cold molten salt storage tank is provided with an auxiliary electric heater, a self-circulation pump, a self-circulation pipeline and a valve; the outlet of the cold molten salt storage tank is provided with a cold molten salt pump, and the outlet of the cold molten salt pump is connected with the inlets of all the molten salt electric heaters;
the cold molten salt pump adopts a pump group with one pump group, the cold molten salt pump adopts a variable-frequency vertical molten salt pump, and the pump body is provided with a temperature measuring point.
Preferably, the temperature controller adopts a DCS controller or a PLC controller;
In the plurality of parallel molten salt electric heaters, the number of the running molten salt electric heaters is equal to the input power of the power supply system divided by m and is an integer upwards, wherein m is a load factor, and the value range is 0.6-1.0; the fused salt electric heater adopts a resistance fused salt electric heater, an electromagnetic fused salt electric heater or an electrode fused salt electric heater.
Preferably, the hot molten salt storage system comprises a hot molten salt storage tank, and a liquid level measuring point, a temperature measuring point and an exhaust point are arranged on the hot molten salt storage tank; an auxiliary electric heater and a hot molten salt self-circulation system are also arranged on the hot molten salt storage tank; the outlet of the hot molten salt storage tank is provided with a hot molten salt pump, the outlet of the hot molten salt pump is connected with a molten salt side inlet of the molten salt cooling system, and the inlet of the hot molten salt storage tank is connected with outlets of all molten salt electric heaters in parallel connection structure;
The hot molten salt pump adopts a pump group with one pump group, the cold molten salt pump adopts a variable-frequency vertical molten salt pump, and the pump body is provided with a temperature measuring point.
Preferably, in the fused salt heat storage depth peak shaving system of the generator set, equipment or fused salt pipelines in contact with fused salt are provided with heat tracing systems, and the heat tracing systems adopt cable heat tracing, electromagnetic heat tracing, hot air heat tracing or steam heat tracing.
The working method of the molten salt heat storage depth peak shaving system of the generator set comprises the following steps:
When the peak of the generator set is regulated, the cold molten salt storage system, the molten salt heating system, the hot molten salt storage system and the power supply system operate, and molten salt in the cold molten salt storage system is heated by the molten salt heating system and then stored in the hot molten salt storage system; when molten salt in the cold molten salt storage system is heated by the molten salt heating system, the operation number of the molten salt electric heaters in the molten salt heating system and the power of the single molten salt electric heaters are regulated by the power system to control, and the molten salt conveyed from the cold molten salt storage system is heated by the molten salt heating system;
When the generator set is in non-peak regulation, the water supply system, the molten salt cooling system, the cold molten salt storage system and the hot molten salt storage system operate, molten salt in the hot molten salt storage system is cooled by the molten salt cooling system and then stored in the cold molten salt storage system, and the molten salt cooling system transfers heat energy to water supply in the water supply system.
Preferably, when the operation number of the fused salt electric heaters in the fused salt heating system and the power of a single fused salt electric heater are regulated through the power system to control:
When the total input power of the power supply system is less than m times of the power of a single fused salt electric heater, one fused salt electric heater is put into operation; when the total input power of the power supply system is m to 2m times of the single power of the fused salt electric heaters, the two fused salt electric heaters are put into operation, and the like until all the fused salt electric heaters are operated, and the peak regulating depth of the generator set is maximum.
The invention has the following beneficial effects:
The fused salt heat storage deep peak regulation system of the generator set adopts fused salt as a heat storage medium, realizes high-capacity, long-time, high-safety and low-cost energy storage, and meets the deep peak regulation requirement of the generator set; the heating molten salt is matched with a plurality of groups of molten salt electric heaters to meet the peak shaving requirement of the quick response of the power grid; the heat energy stored by the fused salt is used for heating the water supply of the generator set through the fused salt cooling system, the water supply temperature is always higher than the lowest use temperature of the fused salt, the self-anticoagulation function is realized, no phase change exists in cold and hot media, and the system is simple and high in reliability; the existing high-efficiency steam turbine generator unit of the generator unit is utilized, the heat consumption is reduced, and higher energy storage efficiency is obtained. In conclusion, the molten salt heat storage deep peak shaving system of the generator set can realize the deep peak shaving of the generator set with large capacity, long time, high safety and low cost, has no phase change of cold and hot media, has higher response speed and higher energy storage efficiency, provides a guarantee for effectively eliminating the way of giving way to new energy electric quantity and provides a guarantee for constructing a novel electric power system taking new energy as a main body.
Drawings
FIG. 1 is a schematic diagram of a structure of a molten salt heat storage depth peak shaving system of a generator set;
FIG. 2 is a schematic diagram of a molten salt heating system and power supply system of the present invention.
In the figure, 1 is a water supply system, 2 is a molten salt cooling system, 3 is a cold molten salt storage system, 3-1 is a salt melting tank, 3-2 is a cold molten salt storage tank, 4 is a molten salt heating system, 5 is a hot molten salt storage system, 5-1 is a hot molten salt storage tank, and 6 is a power supply system; 4-0 is a control system, 4-1-1 is an inlet temperature measuring point, 4-1-2 is an inlet regulating valve, 4-1-3 is a molten salt electric heater, 4-1-4 is an outlet shutoff valve, 4-1-5 is an outlet temperature measuring point, 4-2 is a first molten salt electric heater, 4-3 is a second molten salt electric heater, 4-4 is a third molten salt electric heater, 4-5 is a fourth molten salt electric heater, 4-6 is a fifth molten salt electric heater, and 4-7 is a sixth molten salt electric heater.
Detailed Description
The invention is described in further detail below with reference to the attached drawings and examples:
As shown in FIG. 1, the molten salt heat storage deep peak regulation system of the generator set comprises a water supply system 1, a molten salt cooling system 2, a cold molten salt storage system 3, a molten salt heating system 4, a hot molten salt storage system 5 and a power supply system 6; the water supply system 1 is communicated with a water side inlet of the molten salt cooling system 2 through a water supply main pipe, is communicated with a water side outlet of the molten salt cooling system 2 through a water return main pipe, and is respectively provided with a temperature measuring point, a pressure measuring point and a flow measuring point, wherein one or more groups of high-point air release points and low-point stain release points are respectively arranged on the water supply main pipe and the water return main pipe; the molten salt side outlet of the molten salt cooling system 2, the cold molten salt storage system 3, the molten salt heating system 4, the hot molten salt storage system 5 and the molten salt side inlet of the molten salt cooling system 2 are sequentially communicated through molten salt pipelines to form closed circulation, and all the system connecting pipelines are provided with shut-off valves and are provided with temperature measuring points, pressure measuring points and flow measuring points; the molten salt heating system 4 is connected to a power supply system 6 by a cable. The water supply temperature of the water supply system 1 is adjustable, and the molten salt cooling system 2 has a self-coagulation preventing function; the water supply main pipe of the water supply system 1 is formed by converging two paths of water supply branch pipes, water taking points of the two paths of water supply branch pipes are respectively positioned at an inlet and an outlet of the one-stage or multi-stage high-pressure heater, a flow regulating valve group is arranged in the water taking branch pipe at the low temperature side, a shutoff valve is arranged in the water taking branch pipe at the high temperature side, and the water supply temperature is always higher than the lowest use temperature of molten salt, so that the molten salt in the molten salt cooling system 2 can be prevented from being condensed and blocked; the molten salt cooling system 2 adopts a molten salt heater, the molten salt heater adopts a shell-and-tube heat exchanger or a plate heat exchanger, both sides of a cold and hot medium of the molten salt heater are provided with a safety valve, a high-point air discharge port and a low-point drain port, the low-point drain ports on the molten salt cold medium side and the molten salt hot medium side are connected to an inlet of a cold molten salt storage system or a salt-dredging tank, and molten salt can automatically flow to the molten salt cold tank or the salt-dredging tank by means of gravity at the low-point drain ports on the molten salt side; the cold molten salt storage system 3 comprises a salt melting tank and a cold molten salt storage tank, wherein the salt melting tank and the cold molten salt storage tank are respectively provided with a liquid level measuring point, a temperature measuring point and an exhaust point; the salt outlet of the salt melting tank is communicated with the inlet of the cold melting salt storage tank; the cold molten salt storage tank is provided with an auxiliary electric heater and a self-circulation system, wherein the self-circulation system comprises a self-circulation pump, a self-circulation pipeline and a valve; the outlet of the cold molten salt storage tank is provided with a cold molten salt pump set, the cold molten salt pump is a variable-frequency vertical molten salt pump, and a pump body of the cold molten salt pump is provided with a temperature measuring point; the molten salt heating system 4 adopts a plurality of stages of molten salt electric heaters which are arranged in parallel, and one of the electric heaters is reserved for standby; each fused salt electric heater inlet is provided with a regulating valve and a temperature measuring point, each fused salt electric heater outlet is provided with a shutoff valve and a temperature measuring point, and the regulating valve and the outlet temperature measuring point form a negative feedback regulating system through a DCS or a PLC controller; the number of the running fused salt electric heaters is equal to the input power of the power supply system 6 divided by m (m is generally 0.8); the fused salt electric heater adopts resistance type, electromagnetic type or electrode type; the hot molten salt storage system 5 comprises a hot molten salt storage tank provided with a liquid level measuring point, a temperature measuring point and an exhaust point; the hot molten salt storage tank is provided with an auxiliary electric heater and a self-circulation system, wherein the self-circulation system comprises a circulating pump, a self-circulation pipeline and a valve; the outlet of the hot molten salt storage tank is provided with a hot-melting rock pump set, the hot-melting rock pump is a variable-frequency vertical molten salt pump, and a pump body of the hot-melting rock pump is provided with a temperature measuring point; the generator set is connected with the molten salt heating system 4 through the power supply system 6, the molten salt heating system 4 can heat molten salt by utilizing electric energy generated by the generator set, and the power supply system 6 is used for controlling the number of the molten salt electric heaters participating in heating; the heat tracing system is arranged on equipment or a pipeline in contact with molten salt in the molten salt heat storage depth peak shaving system of the generator set, and cable heat tracing, electromagnetic heat tracing, hot air heat tracing or steam heat tracing are adopted.
According to the invention, a plurality of groups of fused salt electric heaters are matched to heat fused salt, so that the peak regulation requirement of the quick response of a power grid is met; the heat energy stored by the fused salt is used for heating the water supply of the generator set through the fused salt cooling system, the water supply temperature is always higher than the lowest use temperature of the fused salt, the self-anticoagulation function is realized, no phase change exists in cold and hot media, and the system is simple and high in reliability; the existing high-efficiency steam turbine generator unit of the generator unit is utilized, the heat consumption is reduced, and higher energy storage efficiency is obtained. In conclusion, the molten salt heat storage deep peak shaving system of the generator set can realize the deep peak shaving of the generator set with large capacity, long time, high safety and low cost, has no phase change of cold and hot media, has higher response speed and higher energy storage efficiency, provides a guarantee for effectively eliminating the way of giving way to new energy electric quantity and provides a guarantee for constructing a novel electric power system taking new energy as a main body.
As shown in fig. 1 and 2, the working method of the molten salt heat storage depth peak shaving system of the generator set comprises the following steps:
When the peak of the generator set is regulated, the cold molten salt storage system 3, the molten salt heating system 4, the hot molten salt storage system 5 and the power supply system 6 operate, molten salt in the cold molten salt tank is heated by the molten salt electric heater and then stored in the hot molten salt tank, and the electric heater converts electric energy into heat energy, so that the online electric quantity of the generator set is reduced; the system peak regulation depth is controlled by adjusting the running number of the fused salt electric heaters and the power of a single fused salt electric heater, and when the total input power of the power supply system 6 is less than 80% of the single power of the fused salt electric heaters, 1 fused salt electric heater is put into operation; taking the uppermost molten salt electric heater 4-1-3 shown in FIG. 2 as an example for explanation, opening the molten salt electric heater inlet regulating valve 4-1-2 and the outlet shutoff valve 4-1-4, and controlling the opening of the regulating valve 4-1-2 by the control system 4-0 to regulate the exothermic molten salt temperature of the outlet of the molten salt electric heater 4-1-3; when the total input power of the power supply system 6 is 80-160% of the single-machine power of the molten salt electric heaters, 2 molten salt electric heaters are put into operation, and so on, according to the relation between the total input power of the power supply system 6 and the single-machine power of the molten salt electric heaters, the number of the put-in molten salt electric heaters can be increased or reduced. The design working condition is that other molten salt electric heaters are all operated except the standby molten salt electric heater, and the peak regulation depth of the generator set is maximum; the rotating speed of the cold molten salt pump controls the temperature of the inlet molten salt of the hot molten salt storage system 5, and the inlet regulating valve of the molten salt electric heater controls the temperature of the outlet molten salt; when the liquid level of the cold melt salt tank is lower than the lowest liquid level set value, the cold melt salt pump is stopped;
When the generator set is in non-peak regulation, the water supply system 1, the molten salt cooling system 2, the cold molten salt storage system 3 and the hot molten salt storage system 5 are operated, molten salt in the hot molten salt tank is cooled by the molten salt cooling system and then stored in the cold molten salt tank, the molten salt cooling system transfers heat energy to the water supply, and the system releases energy to reduce the heat consumption of the generator set; the water supply temperature is controlled by the opening of the low-temperature water taking branch regulating valve, and the lowest water supply temperature is not lower than the lowest use temperature of the used molten salt, so that the self-condensation prevention of the molten salt cooling system 2 is realized; the rotational speed of the hot molten salt pump controls the temperature of the outlet molten salt of the molten salt cooling system; when the liquid level of the hot molten salt tank is lower than the lowest liquid level set value, the hot molten salt pump is stopped;
The auxiliary electric heaters of the hot-melt salt tank and the cold-melt salt tank are operated when the temperature in the tanks is lower than the lowest using temperature and a safety margin are added, the recirculation pump and the recirculation valve are simultaneously started, and the auxiliary electric heaters and the recirculation pump stop operating after the set temperature is reached; the heat tracing system controls the wall temperature of the fused salt pipeline and equipment to be not lower than the lowest using temperature of the fused salt.
Claims (9)
1. The deep peak regulation system for molten salt heat storage of the generator set is characterized by comprising a molten salt cooling system (2), a cold molten salt storage system (3), a molten salt heating system (4), a hot molten salt storage system (5), a power supply system (6) and a water supply system (1) of the generator set;
The water supply system (1) is communicated with a water side inlet of the molten salt cooling system (2) through a water supply main pipe, and the water supply system (1) is communicated with a water side outlet of the molten salt cooling system (2) through a water return main pipe;
the molten salt heating system (4) comprises a plurality of molten salt electric heaters which are connected in parallel, wherein the inlet of each molten salt electric heater is provided with a flow regulating valve and a temperature measuring point, and the outlet of each molten salt electric heater is provided with a shutoff valve and a temperature measuring point; the molten salt electric heaters are connected with a power supply system (6), and a temperature controller is connected between flow regulating valves at inlets of all the molten salt electric heaters and temperature measuring points at outlets of the molten salt electric heaters;
all flow regulating valves and temperature measuring points at the inlets of the molten salt electric heaters and all shutoff valves and temperature measuring points at the outlets of the molten salt electric heaters are connected with a power supply system (6);
the molten salt side outlet of the molten salt cooling system (2) is connected with the molten salt inlet of the cold molten salt storage system (3) through a molten salt pipeline, the molten salt outlet of the cold molten salt storage system (3) is connected with the inlets of all molten salt electric heater parallel structures through a molten salt pipeline, the outlets of all molten salt electric heater parallel structures are connected with the molten salt inlet of the hot molten salt storage system (5) through a molten salt pipeline, and the molten salt outlet of the hot molten salt storage system (5) is connected with the molten salt side inlet of the molten salt cooling system (2) through a molten salt pipeline;
The molten salt side outlet of the molten salt cooling system (2) is connected with a molten salt inlet of the cold molten salt storage system (3), the molten salt outlet of the cold molten salt storage system (3) is connected with all molten salt pipelines connected with inlets of the molten salt electric heater parallel structure, all outlets of the molten salt electric heater parallel structure are connected with molten salt inlets of the hot molten salt storage system (5), and shutoff valves are uniformly distributed on the molten salt pipelines of the molten salt outlet of the hot molten salt storage system (5) connected with the molten salt side inlet of the molten salt cooling system (2);
A fused salt side outlet of the fused salt cooling system (2) is connected with a fused salt inlet of the cold fused salt storage system (3), a fused salt outlet of the cold fused salt storage system (3) is connected with inlets of all fused salt electric heaters in parallel, outlets of all fused salt electric heaters in parallel are connected with a fused salt inlet of the hot fused salt storage system (5), and a fused salt outlet of the hot fused salt storage system (5) is connected with a fused salt side inlet of the fused salt cooling system (2) to form a fused salt pipeline, wherein temperature measuring points, pressure measuring points and flow measuring points are arranged on the fused salt pipeline;
In the plurality of parallel molten salt electric heaters, the number of the running molten salt electric heaters is equal to the input power of a power supply system (6) divided by m and is an integer upwards, wherein m is a load factor, and the value range is 0.6-1.0; the fused salt electric heater adopts a resistance fused salt electric heater, an electromagnetic fused salt electric heater or an electrode fused salt electric heater.
2. The molten salt heat storage depth peak shaving system of the generator set according to claim 1, wherein one end of the water supply main pipe is communicated with a water side inlet of the molten salt cooling system (2), the other end of the water supply main pipe is connected with a first water supply branch pipe and a second water supply branch pipe, an inlet of the first water supply branch pipe is arranged at an inlet of a one-stage or multi-stage high-pressure heater of the water supply system (1), an inlet of the second water supply branch pipe is arranged at an outlet of the one-stage or multi-stage high-pressure heater of the water supply system (1), a flow regulating valve group is arranged on the first water supply branch pipe, and a shutoff valve is arranged on the second water supply branch pipe.
3. The molten salt heat storage deep peak shaving system of the generator set according to claim 1, wherein the molten salt cooling system (2) adopts a molten salt heater, the molten salt heater adopts a shell-and-tube heat exchanger or a plate heat exchanger, a safety valve, a high-point air release port and a low-point drain port are arranged on a molten salt cooling medium side and a molten salt heating medium side of the heat exchanger, the low-point drain ports on the molten salt cooling medium side and the molten salt heating medium side are connected to an inlet of a cold melting salt storage system or a salt drain tank, and the low-point drain port is higher than the inlet of the cold melting salt storage system and the salt drain tank.
4. The molten salt heat storage depth peak shaving system of the generator set according to claim 1, wherein the cold molten salt storage system (3) comprises a salt melting tank (3-1) and a cold molten salt storage tank (3-2), and the salt melting tank (3-1) and the cold molten salt storage tank (3-2) are respectively provided with a liquid level measuring point, a temperature measuring point and an exhaust point; the salt outlet of the salt melting tank (3-1) is communicated with the inlet of the cold molten salt storage tank (3-2), and the inlet of the cold molten salt storage tank (3-2) is connected with the molten salt side outlet of the molten salt cooling system (2) through a molten salt pipeline; the cold molten salt storage tank (3-2) is provided with an auxiliary electric heater, a self-circulation pump, a self-circulation pipeline and a valve; the outlet of the cold molten salt storage tank (3-2) is provided with a cold molten salt pump, and the outlet of the cold molten salt pump is connected with the inlets of all the molten salt electric heaters;
the cold molten salt pump adopts a pump group with one pump group, the cold molten salt pump adopts a variable-frequency vertical molten salt pump, and the pump body is provided with a temperature measuring point.
5. The molten salt heat storage depth peak shaving system of the generator set according to claim 1, wherein the temperature controller is a DCS controller or a PLC controller.
6. The molten salt heat storage depth peak shaving system of the generator set, according to claim 1, is characterized in that a hot molten salt storage tank (5-1) is included in the hot molten salt storage system (5), and a liquid level measuring point, a temperature measuring point and an exhaust point are arranged on the hot molten salt storage tank (5-1); an auxiliary electric heater and a hot molten salt self-circulation system are also arranged on the hot molten salt storage tank (5-1); the outlet of the hot molten salt storage tank (5-1) is provided with a hot molten salt pump, the outlet of the hot molten salt pump is connected with a molten salt side inlet of the molten salt cooling system (2), and the inlet of the hot molten salt storage tank (5-1) is connected with outlets of all molten salt electric heaters in parallel connection structure;
The hot molten salt pump adopts a pump group with one pump group, the cold molten salt pump adopts a variable-frequency vertical molten salt pump, and the pump body is provided with a temperature measuring point.
7. The molten salt heat storage depth peak shaving system of a generator set according to any one of claims 1 to 6, wherein in the molten salt heat storage depth peak shaving system of the generator set, heat tracing systems are arranged on equipment or molten salt pipelines in contact with molten salt, and the heat tracing systems adopt cable heat tracing, electromagnetic heat tracing, hot air heat tracing or steam heat tracing.
8. The working method of the molten salt heat storage depth peak shaving system of the generator set, which is any one of claims 1 to 7, is characterized by comprising the following steps:
When the peak of the generator set is regulated, the cold molten salt storage system (3), the molten salt heating system (4), the hot molten salt storage system (5) and the power supply system (6) operate, and molten salt in the cold molten salt storage system (3) is heated by the molten salt heating system (4) and then stored in the hot molten salt storage system (5); when molten salt in the cold molten salt storage system (3) is heated by the molten salt heating system (4), the operation number of the molten salt electric heaters in the molten salt heating system (4) and the power of a single molten salt electric heater are regulated by the power system (6) to control, and the molten salt conveyed from the cold molten salt storage system (3) is heated by the molten salt heating system (4);
When the generator set is in non-peak regulation, the water supply system (1), the molten salt cooling system (2), the cold molten salt storage system (3) and the hot molten salt storage system (5) are operated, molten salt in the hot molten salt storage system (5) is stored into the cold molten salt storage system (3) after being cooled by the molten salt cooling system (2), and the molten salt cooling system (2) transmits heat energy to water supply in the water supply system (1).
9. The working method of the molten salt heat storage depth peak shaving system of the generator set according to claim 8 is characterized in that when the operation number of the molten salt electric heaters in the molten salt heating system (4) and the power of a single molten salt electric heater are regulated through the power supply system (6), the operation number is controlled:
when the total input power of the power supply system (6) is less than m times of the power of a single fused salt electric heater, one fused salt electric heater is put into operation; when the total input power of the power supply system (6) is m to 2m times of the single power of the fused salt electric heaters, the two fused salt electric heaters are put into operation, and the like until all the fused salt electric heaters are operated, and the peak regulating depth of the generator set is maximum.
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