CN116398865B - Efficient and flexible peak shaving molten salt system - Google Patents
Efficient and flexible peak shaving molten salt system Download PDFInfo
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- CN116398865B CN116398865B CN202310351976.2A CN202310351976A CN116398865B CN 116398865 B CN116398865 B CN 116398865B CN 202310351976 A CN202310351976 A CN 202310351976A CN 116398865 B CN116398865 B CN 116398865B
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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
- 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
- F22B37/00—Component parts or details of 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
- F22D1/32—Feed-water heaters, i.e. economisers or like preheaters arranged to be heated by steam, e.g. bled from turbines
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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
- F22D1/50—Feed-water heaters, i.e. economisers or like preheaters incorporating thermal de-aeration of feed-water
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22G—SUPERHEATING OF STEAM
- F22G3/00—Steam superheaters characterised by constructional features; Details or component parts thereof
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D20/00—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00
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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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- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
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- Combustion & Propulsion (AREA)
- Engine Equipment That Uses Special Cycles (AREA)
Abstract
The invention discloses a high-efficiency and flexible peak shaving fused salt system, wherein a power generation system comprises a boiler, a high-pressure cylinder, a medium-pressure cylinder and a low-pressure cylinder; the first-stage molten salt system comprises a first molten salt heat storage module and a first molten salt heat release module, and the second molten salt system comprises a second molten salt heat storage module and a second molten salt heat release module; the first molten salt heat storage module is configured to heat molten salt from partial steam diverted upstream of the main steam inlet of the medium pressure cylinder; the first molten salt heat release module is configured to heat water led out from the deaerator and input the water into the second molten salt heat release module for continuous heating, and superheated steam heated by the second molten salt heat release module is combined with reheat steam output by the boiler and then input into the medium-pressure cylinder. The fused salt system can solve the problems of overtemperature and overpressure caused by mismatching of main steam and reheat steam flows of a boiler and the problem of incapability of merging steam caused by inconsistent parameters of two steam flows.
Description
Technical Field
The invention relates to the technical field of thermal power generation, in particular to a high-efficiency and flexible peak shaving molten salt system for a thermal power unit.
Background
The output of new energy sources such as wind power, photovoltaic and the like is seriously affected by weather, the grid connection of large-scale new energy sources has the characteristics of intermittence and volatility, and the grid safe operation is seriously threatened, so that the output of the new energy sources needs to be stabilized by an adjustable power supply, and the grid stability is maintained. China has a large number of thermal power generating units, and the thermal power generating units have certain peak regulation capacity, so that the consumption of new energy sources such as wind power, photovoltaic and the like can be promoted, and the low-carbonization development of the electric power industry of China is promoted.
The lifting load speed, flexibility and peak shaving depth of the thermal power generation unit can be effectively improved by coupling the fused salt energy storage device in the thermal power generation system.
The principle of the fused salt heat storage peak regulation scheme is that in the power generation process of the thermal power generating unit, the collection and the utilization of steam are realized through the fused salt heat absorption/release function. Compared with a common thermal generator set, the fused salt heat storage and peak shaving scheme is added with a fused salt heat storage system and a fused salt heat release system. When the unit needs load reduction adjustment, a fused salt heat storage system is started, part of steam generated by a boiler heats cold fused salt in a cold salt tank through the fused salt heat storage system, and then the cold fused salt is stored in a hot salt tank. When the unit needs to be regulated in load rising, the high-temperature molten salt in the hot salt tank releases heat through the molten salt heat release system, the generated steam returns to the steam turbine to generate power, and then the released molten salt is stored in the Leng Wen tank.
When the existing fused salt heat storage peak regulation scheme is used for lifting load of a unit, as the steam parameters produced by a boiler are inconsistent with the steam parameters produced by a fused salt system, two steam streams cannot be combined or are combined with gas with great difficulty, and the peak regulation capacity of a thermal power unit is limited, so that the problems of low peak regulation rate, narrow peak regulation range, long power grid load rapid change response time and the like exist.
Disclosure of Invention
The invention aims to provide a high-efficiency and flexible peak shaving molten salt system so as to solve the technical problems.
In order to achieve the above purpose, the invention provides a high-efficiency and flexible peak shaving molten salt system, which comprises a power generation system and a molten salt system; the power generation system comprises a boiler and a steam turbine, wherein the steam turbine is provided with a high-pressure cylinder, a medium-pressure cylinder and a low-pressure cylinder; the molten salt system comprises a first-stage molten salt system and a second-stage molten salt system; the first-stage molten salt system comprises a first high-temperature molten salt tank, a first low-temperature molten salt tank, a first molten salt heat storage module and a first molten salt heat release module, and the second molten salt system comprises a second high-temperature molten salt tank, a second low-temperature molten salt tank, a second molten salt heat storage module and a second molten salt heat release module; the first molten salt heat storage module is configured to heat molten salt from partial steam diverted upstream of the main steam inlet of the medium pressure cylinder; the first molten salt heat release module is configured to heat water led out from the deaerator and input the water into the second molten salt heat release module for continuous heating, and superheated steam heated by the second molten salt heat release module is combined with reheat steam output by the boiler and then input into the medium-pressure cylinder.
Optionally, the first molten salt heat release module includes first superheater, evaporimeter and pre-heater, the import of the export connection first high temperature molten salt pump of first high temperature molten salt jar, the export connection of first high temperature molten salt pump the hot side import of first superheater, the hot side exit linkage evaporimeter of first superheater the hot side import, the hot side exit linkage of evaporimeter the hot side import of pre-heater, the hot side export of pre-heater with the import of first low temperature molten salt jar is connected.
Optionally, the first outlet of the deaerator is connected with the high-pressure heater through the main water supply pump, the second outlet of the deaerator is connected with the cold side inlet of the preheater through the auxiliary water supply pump, the cold side outlet of the preheater is connected with the cold side inlet of the evaporator, and the cold side inlet of the evaporator is connected with the cold side inlet of the first superheater.
Optionally, the second molten salt heat release module includes the second superheater, the export of second high temperature molten salt jar is through second high temperature molten salt pump connection the hot side import of second superheater, the hot side exit linkage of second superheater the import of second low temperature molten salt jar, the cold side exit linkage of first superheater the cold side import of second superheater, the cold side export of second superheater is through the pipeline with the reheat steam output pipeline of boiler merges the back and connects the steam inlet of middling pressure jar.
Optionally, the first molten salt heat storage module comprises a molten salt steam heater, an outlet of the first low-temperature molten salt tank is connected with a cold side inlet of the molten salt steam heater, and a cold side outlet of the molten salt steam heater is connected with an inlet of the first high-temperature molten salt tank; the hot side inlet of the molten salt steam heater is connected with a reheat steam diversion pipeline of the boiler, and the hot side outlet of the molten salt steam heater is connected with a steam inlet of the low pressure cylinder.
Optionally, a throttle valve is arranged on a pipeline of which the hot side outlet of the molten salt steam heater is communicated with the steam inlet of the low pressure cylinder.
Optionally, the first molten salt heat storage module comprises a first molten salt electric heater, a cold side outlet of the molten salt steam heater is connected with a molten salt inlet of the first molten salt electric heater, and a molten salt outlet of the first molten salt electric heater is connected with an inlet of the first high-temperature molten salt tank.
Optionally, the second molten salt heat storage module comprises a second molten salt electric heater, the second low-temperature molten salt tank is connected with a molten salt inlet of the second molten salt electric heater through a second low-temperature molten salt pump, and a molten salt outlet of the second molten salt electric heater is connected with an inlet of the second high-temperature molten salt tank.
Optionally, the molten salt temperature used by the second stage molten salt system is higher than the molten salt temperature used by the first stage molten salt system.
Optionally, the molten salt temperature of the first high-temperature molten salt tank is 500-565 ℃, and the molten salt temperature of the first low-temperature molten salt tank is 240-290 ℃; the molten salt temperature of the second high-temperature molten salt tank is 600-645 ℃, and the molten salt temperature of the second low-temperature molten salt tank is 500-565 ℃.
The high-efficiency flexible peak regulation molten salt system provided by the invention only extracts and combines steam from the medium-pressure cylinder in the load lifting process, so that the molten salt system and the boiler system can be completely decoupled, and the problem of overtemperature and overpressure of the boiler caused by mismatching of main steam and reheat steam flows is avoided; in addition, a two-stage molten salt system is designed, part of steam extracted from the medium pressure cylinder can be heated to be basically consistent with parameters of reheat steam of the boiler through the second-stage molten salt system, so that the two streams of steam are converged and input into the medium pressure cylinder together to do work, the problem that the two streams of steam cannot be combined due to inconsistent parameters of the two streams of steam is solved, the characteristic of rapid load lifting can be used for primary frequency modulation of a power grid, the peak regulation range and the peak regulation rate are obviously improved, the consumption of large-scale new energy is promoted, and the low carbonization development of the power industry is promoted.
In a preferred scheme, because the molten salt is difficult to heat to the higher temperature required by the first high-temperature molten salt tank and the second high-temperature molten salt tank only by utilizing steam, the invention further heats the molten salt by arranging the first molten salt electric heater and the second molten salt electric heater, so that the problem of insufficient temperature of the molten salt is solved, and the problem of insufficient temperature of the molten salt is also utilized for quick load reduction of a unit by consuming electric load.
In another preferred scheme, the molten salt used in the first-stage molten salt system has lower temperature, and can be 560 ℃ grade molten salt with lower price, while the molten salt used in the second-stage molten salt system has higher temperature, and can be 600 ℃ grade molten salt with higher price. The molten salt system provided by the invention can use low-price molten salt in a low-temperature molten salt area (namely a first-stage molten salt system) through two-stage arrangement, and can greatly reduce the molten salt cost.
Drawings
Fig. 1 is a schematic structural diagram of a high-efficiency and flexible peak shaving molten salt system according to an embodiment of the present invention.
In the figure:
1. boiler 2, high pressure cylinder 3, medium pressure cylinder 4, low pressure cylinder 5, condenser 6, condensate pump 7, low pressure heater 8, deaerator 9, main feedwater pump 10, high pressure heater 11, auxiliary feedwater pump 12, preheater 13, evaporator 14, first superheater 15, second superheater 16, first high temperature molten salt tank 17, first high temperature molten salt pump 18, first low temperature molten salt tank 19, first low temperature molten salt pump 20, steam heater 21, first molten salt electric heater 22, second high temperature molten salt tank 23, second high temperature molten salt pump 24, second low temperature molten salt tank 25, second low temperature molten salt pump 26, second molten salt electric heater 27, throttle valve
Detailed Description
In order to better understand the aspects of the present invention, the present invention will be described in further detail with reference to the accompanying drawings and detailed description.
In the present specification, the terms "upper, lower, inner, outer" and the like are established based on the positional relationship shown in the drawings, and the corresponding positional relationship may be changed according to the drawings, so that the terms are not to be construed as absolute limitation of the protection scope; moreover, relational terms such as "first" and "second", and the like, may be used solely to distinguish one element from another element having the same name, without necessarily requiring or implying any actual such relationship or order between such elements.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a molten salt system with efficient and flexible peak shaving according to an embodiment of the present invention.
As shown in the figure, in a specific embodiment, the high-efficiency flexible peak shaving molten salt system provided by the invention is used for a thermal power unit and comprises a power generation system and a molten salt system; the power generation system comprises a boiler 1 and a steam turbine, wherein the steam turbine is provided with a high-pressure cylinder 2, a medium-pressure cylinder 3 and a low-pressure cylinder 4, and the molten salt system is divided into a first-stage molten salt system and a second-stage molten salt system.
The first high-temperature molten salt tank 16, the first low-temperature molten salt tank 18, the first molten salt heat storage module and the first molten salt heat release module together form a first-stage molten salt system, and the second high-temperature molten salt tank 22, the second low-temperature molten salt tank 24, the second molten salt heat storage module and the second molten salt heat release module together form a second molten salt system, wherein the first molten salt heat storage module is used for heating molten salt from partial steam split upstream of a main steam inlet of the medium-pressure cylinder 3; the first fused salt heat release module is used for heating water led out from the deaerator 8 and inputting the water into the second fused salt heat release module for continuous heating, and superheated steam heated by the second fused salt heat release module is combined with reheat steam output by the boiler 1 and then is input into the medium pressure cylinder 3.
Specifically, the first molten salt heat release module is provided with a first superheater 14, an evaporator 13 and a preheater 12, an outlet of the first high-temperature molten salt tank 16 is connected with an inlet of the first high-temperature molten salt pump 17, an outlet of the first high-temperature molten salt pump 17 is connected with a hot side inlet of the first superheater 14, a hot side outlet of the first superheater 14 is connected with a hot side inlet of the evaporator 13, a hot side outlet of the evaporator 13 is connected with a hot side inlet of the preheater 12, and a hot side outlet of the preheater 12 is connected with an inlet of the first low-temperature molten salt tank 18.
The first outlet of the deaerator 8 is connected with the high-pressure heater 10 through the main water supply pump 9, the second outlet of the deaerator 8 is connected with the cold side inlet of the preheater 12 through the auxiliary water supply pump 11, the cold side outlet of the preheater 12 is connected with the cold side inlet of the evaporator 13, and the cold side inlet of the evaporator 13 is connected with the cold side inlet of the first superheater 14.
The water supply of the molten salt system is taken from the deaerator 8 with lower temperature, so that the temperature of low-temperature molten salt in the low-temperature molten salt tank for heating the water supply is conveniently reduced, and the temperature difference between the high-temperature molten salt tank and the low-temperature molten salt tank can be increased, thereby reducing the flow of the molten salt.
The auxiliary feed pump 11 independently conveys water to the molten salt system, so that decoupling of the water supply of the molten salt system and the water supply of the power generation system is realized, and the stability of water conveying of the molten salt system is improved.
The second molten salt heat release module is provided with a second superheater 15, a 22 outlet of the second high-temperature molten salt tank is connected with a hot side inlet of the second superheater 15 through a second high-temperature molten salt pump 23, a hot side outlet of the second superheater 15 is connected with an inlet of a second low-temperature molten salt tank 24, a cold side outlet of the first superheater 14 is connected with a cold side inlet of the second superheater 15, and a cold side outlet of the second superheater 15 is connected with a steam inlet of the medium-pressure cylinder 3 after being combined with a reheat steam output pipeline of the boiler 1 through a pipeline.
The first molten salt heat storage module is provided with a molten salt steam heater 20, an outlet of the first low-temperature molten salt tank 18 is connected with a cold side inlet of the molten salt steam heater 20, and a cold side outlet of the molten salt steam heater 20 is connected with an inlet of the first high-temperature molten salt tank 16; the hot side inlet of the fused salt steam heater 20 is connected with a reheat steam diversion pipeline of the boiler 1, the hot side outlet of the fused salt steam heater 20 is connected with the steam inlet of the low pressure cylinder 4, and a throttle valve 27 is arranged on a pipeline of which the hot side outlet of the fused salt steam heater 20 is communicated with the steam inlet of the low pressure cylinder 4.
The first molten salt heat storage module is further provided with a first molten salt electric heater 21, a cold side outlet of the molten salt steam heater 20 is connected with a molten salt inlet of the first molten salt electric heater 21, and a molten salt outlet of the first molten salt electric heater 21 is connected with an inlet of the first high-temperature molten salt tank 16.
The second molten salt heat storage module is provided with a second molten salt electric heater 26, the second low-temperature molten salt tank 24 is connected with a molten salt inlet of the second molten salt electric heater 26 through a second low-temperature molten salt pump 25, and a molten salt outlet of the second molten salt electric heater 26 is connected with an inlet of the second high-temperature molten salt tank 22.
Because the molten salt is difficult to be heated to the higher temperature required by the first high-temperature molten salt tank 16 and the second high-temperature molten salt tank 22 only by utilizing steam, the invention further heats the molten salt by arranging the first molten salt electric heater 21 and the second molten salt electric heater 26, so that the problem of insufficient temperature of the molten salt is solved on one hand, and on the other hand, the electric load is consumed, and the molten salt is rapidly reduced by using a unit.
All the devices of the molten salt heat storage and release system can be arranged in a centralized way to form an independent system, so that the operation control is convenient.
Because the two-stage molten salt system is arranged and the two-stage molten salt systems cooperate in a specific way, the temperature of the molten salt used by the second-stage molten salt system can be higher than that of the molten salt used by the first-stage molten salt system.
Specifically, the molten salt temperature of the first high-temperature molten salt tank 16 is 500-565 ℃, and the molten salt temperature of the first low-temperature molten salt tank 18 is 240-290 ℃; the molten salt temperature of the second high temperature molten salt tank 22 is 600-645 ℃, and the molten salt temperature of the second low temperature molten salt tank 24 is 500-565 ℃.
The molten salt used in the first-stage molten salt system has lower temperature, and can be 560 ℃ grade molten salt with lower price, while the molten salt used in the second-stage molten salt system has higher temperature, and can be 600 ℃ grade molten salt with higher price. The molten salt system provided by the invention can use low-price molten salt in a low-temperature molten salt area (namely a first-stage molten salt system) through two-stage arrangement, and can greatly reduce the molten salt cost.
The first heat storage module of the first stage molten salt system is used for consuming steam heat and electric energy of the power generation system to heat the low-temperature molten salt into high-temperature molten salt, and storing high-temperature heat in the high-temperature molten salt in the first high-temperature molten salt tank 16. The second heat storage module of the second stage molten salt system is used for consuming the electric energy of the power generation system to heat the low-temperature molten salt into high-temperature molten salt, and storing the high-temperature heat in the high-temperature molten salt in the second high-temperature molten salt tank 22.
The first heat release module of the first stage molten salt system may utilize the high temperature molten salt stored in the first high temperature molten salt tank 16 to heat the feed water through the preheater 12, the evaporator 13 and the first superheater 14 to generate high temperature and high pressure superheated steam. The second heat release module of the second stage molten salt system can utilize the high temperature molten salt stored in the second high temperature molten salt tank 22 to further heat the steam to the same temperature and pressure as the reheat steam of the boiler through the second superheater 15, and then the two steam streams are combined and enter the intermediate pressure cylinder 3 of the steam turbine to perform work and generate power.
When the unit rapidly reduces load, the unit extracts part of boiler reheat steam for heating molten salt, and returns to the low pressure cylinder 4 after heat release. This part of steam does not work in the intermediate pressure cylinder 3, thereby reducing the load of the steam turbine; the first molten salt electric heater 21 and the second molten salt electric heater 26 further consume electric loads of the power generation system to heat molten salt, so that the on-line load of the unit is further reduced. The high-temperature molten salt after absorbing heat stores high-temperature heat in the first high-temperature molten salt tank 16 and the second high-temperature molten salt tank 22 respectively for use when the machine set is used for load lifting.
When the unit is rapidly loaded, the high-temperature molten salt in the first high-temperature molten salt tank 16 and the second high-temperature molten salt tank 22 preheat, evaporate and overheat the feed water, heat the feed water into superheated steam with the same parameters as the reheat steam of the boiler, and then combine the two steam flows into the medium-pressure cylinder 3 to do work, so that the load of the unit is rapidly increased. The exothermic low-temperature molten salt is stored in the first low-temperature molten salt tank 18 and the second low-temperature molten salt tank 24 respectively for reuse when the unit is in load reduction.
The molten salt system for efficient and flexible peak shaving of the thermal power generating unit provided by the invention is described in detail. The principles and embodiments of the present invention have been described herein with reference to specific examples, the description of which is intended only to facilitate an understanding of the core concepts of the invention. It should be noted that it will be apparent to those skilled in the art that various modifications and adaptations of the invention can be made without departing from the principles of the invention and these modifications and adaptations are intended to be within the scope of the invention as defined in the following claims.
Claims (10)
1. The high-efficiency flexible peak shaving molten salt system comprises a power generation system and a molten salt system; the power generation system comprises a boiler (1) and a steam turbine, wherein the steam turbine is provided with a high-pressure cylinder (2), a medium-pressure cylinder (3) and a low-pressure cylinder (4); the molten salt system is characterized by comprising a first-stage molten salt system and a second-stage molten salt system; the first-stage molten salt system comprises a first high-temperature molten salt tank (16), a first low-temperature molten salt tank (18), a first molten salt heat storage module and a first molten salt heat release module, and the second-stage molten salt system comprises a second high-temperature molten salt tank (22), a second low-temperature molten salt tank (24), a second molten salt heat storage module and a second molten salt heat release module; the first molten salt heat storage module is configured to heat molten salt from partial steam split upstream of a main steam inlet of the medium pressure cylinder (3); the first molten salt heat release module is configured to heat water led out from the deaerator (8) and input into the second molten salt heat release module for continuous heating, and superheated steam heated by the second molten salt heat release module is combined with reheat steam output by the boiler (1) and then input into the medium pressure cylinder (3).
2. The efficient and flexible peak shaving molten salt system according to claim 1, wherein the first molten salt heat release module comprises a first superheater (14), an evaporator (13) and a preheater (12), an outlet of the first high temperature molten salt tank (16) is connected with an inlet of a first high temperature molten salt pump (17), an outlet of the first high temperature molten salt pump (17) is connected with a hot side inlet of the first superheater (14), a hot side outlet of the first superheater (14) is connected with a hot side inlet of the evaporator (13), a hot side outlet of the evaporator (13) is connected with a hot side inlet of the preheater (12), and a hot side outlet of the preheater (12) is connected with an inlet of the first low temperature molten salt tank (18).
3. The efficient and flexible peak shaving molten salt system according to claim 2, wherein a first outlet of the deaerator (8) is connected with a high-pressure heater (10) through a main feed water pump (9), a second outlet of the deaerator (8) is connected with a cold side inlet of the preheater (12) through an auxiliary feed water pump (11), a cold side outlet of the preheater (12) is connected with a cold side inlet of the evaporator (13), and a cold side outlet of the evaporator (13) is connected with a cold side inlet of the first superheater (14).
4. A high efficiency flexible peak shaving molten salt system according to claim 3, wherein the second molten salt heat release module comprises a second superheater (15), the outlet of the second high temperature molten salt tank (22) is connected with the hot side inlet of the second superheater (15) through a second high temperature molten salt pump (23), the hot side outlet of the second superheater (15) is connected with the inlet of the second low temperature molten salt tank (24), the cold side outlet of the first superheater (14) is connected with the cold side inlet of the second superheater (15), and the cold side outlet of the second superheater (15) is combined with the reheat steam output pipeline of the boiler (1) through a pipeline and then is connected with the steam inlet of the intermediate pressure tank (3).
5. The efficient and flexible peaking molten salt system of claim 4, wherein the first molten salt heat storage module comprises a molten salt steam heater (20), an outlet of the first low temperature molten salt tank (18) is connected to a cold side inlet of the molten salt steam heater (20), and a cold side outlet of the molten salt steam heater (20) is connected to an inlet of the first high temperature molten salt tank (16); the hot side inlet of the molten salt steam heater (20) is connected with a reheat steam diversion pipeline of the boiler (1), and the hot side outlet of the molten salt steam heater (20) is connected with a steam inlet of the low pressure cylinder (4).
6. The efficient and flexible peaking molten salt system of claim 5, characterized in that a throttle valve (27) is provided on the pipeline where the hot side outlet of the molten salt steam heater (20) communicates with the steam inlet of the low pressure cylinder (4).
7. The efficient and flexible peak shaving molten salt system of claim 6, wherein the first molten salt heat storage module comprises a first molten salt electric heater (21), a cold side outlet of the molten salt steam heater (20) is connected with a molten salt inlet of the first molten salt electric heater (21), and a molten salt outlet of the first molten salt electric heater (21) is connected with an inlet of the first high-temperature molten salt tank (16).
8. The efficient and flexible peak shaving molten salt system of claim 7, wherein the second molten salt heat storage module comprises a second molten salt electric heater (26), the second low temperature molten salt tank (24) is connected with a molten salt inlet of the second molten salt electric heater (26) through a second low temperature molten salt pump (25), and a molten salt outlet of the second molten salt electric heater (26) is connected with an inlet of the second high temperature molten salt tank (22).
9. The efficient and flexible peaking molten salt system of any one of claims 1 to 8 wherein the molten salt temperature used by the second stage molten salt system is higher than the molten salt temperature used by the first stage molten salt system.
10. The efficient and flexible peak shaving molten salt system of claim 9, wherein the molten salt temperature of the first high temperature molten salt tank is 500-565 ℃ and the molten salt temperature of the first low temperature molten salt tank is 240-290 ℃; the molten salt temperature of the second high-temperature molten salt tank is 600-645 ℃, and the molten salt temperature of the second low-temperature molten salt tank is 500-565 ℃.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310351976.2A CN116398865B (en) | 2023-04-04 | 2023-04-04 | Efficient and flexible peak shaving molten salt system |
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| CN202310351976.2A CN116398865B (en) | 2023-04-04 | 2023-04-04 | Efficient and flexible peak shaving molten salt system |
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| CN116398865A CN116398865A (en) | 2023-07-07 |
| CN116398865B true CN116398865B (en) | 2024-08-02 |
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| CN114382559A (en) * | 2022-01-26 | 2022-04-22 | 斯玛特储能技术有限公司 | Double-medium heat storage type peak regulation thermal power generation system and heat storage and release method |
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| CN114382559A (en) * | 2022-01-26 | 2022-04-22 | 斯玛特储能技术有限公司 | Double-medium heat storage type peak regulation thermal power generation system and heat storage and release method |
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