CN114382559A - Double-medium heat storage type peak regulation thermal power generation system and heat storage and release method - Google Patents
Double-medium heat storage type peak regulation thermal power generation system and heat storage and release method Download PDFInfo
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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
- 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
- F01K3/00—Plants characterised by the use of steam or heat accumulators, or intermediate steam heaters, therein
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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
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The invention discloses a double-medium heat storage type peak shaving thermal power generation system and a heat storage and release method. The system comprises a boiler, a steam turbine, a generator, a condensate pump, a low-pressure heater group, a deaerator, a high-pressure heater group, a molten salt tank, a molten salt pump, a steam-salt heat exchanger, a water-salt heat exchanger, a phase-change heat exchanger, a water storage tank and the like. During the electricity consumption valley of the power grid, when the stable combustion load of the boiler is greater than the load of the steam turbine, the surplus high-grade heat is stored in the molten salt heat storage tank, and the low-grade heat is stored in the water storage tank; during the period that the power grid is not used in the valley, the molten salt heat storage tank releases the stored heat to generate steam which is sent to the steam turbine to do work; the hot water in the water storage tank enters a deaerator. The system and the method solve the problem that the lowest loads of a boiler and a steam turbine of the thermal power generator set are not matched during the power consumption valley period of a power grid, and achieve the purpose of deep, rapid and flexible peak shaving of the thermal power generator set.
Description
Technical Field
The invention belongs to the field of power generation, and particularly relates to a double-medium heat storage type peak shaving thermal power generation system and a heat storage and release method.
Background
Under the important strategic background of carbon peaking and carbon neutralization in China, the large-scale development and high-quality development of new energy power generation are comprehensively promoted, and the total installed capacity of wind power generation and solar power generation in China reaches more than 12 hundred million kilowatts by 2030. The fluctuation of wind power and photovoltaic power generation is large, and the peak-to-valley demand of the electric load is difficult to match, so that the peak-load regulation pressure of the power system is obviously increased. At present, a main unit for peak regulation of electric power is a thermal power generating unit, but the thermal power generating unit is limited by the minimum stable combustion load of a key device, namely a boiler, and during the electricity consumption valley period of a power grid, the thermal power generating unit is difficult to continuously maintain to operate under a low-load working condition, so that the peak regulation capacity of the thermal power generating unit is greatly influenced. Particularly, when the power generation ratio of new energy is continuously increased, the ratio of the thermal power generating unit is relatively reduced, and the power grid puts higher requirements on the peak regulation depth of the thermal power generating unit. Therefore, technical means are needed to improve the capacity of deep peak shaving of the unit.
The depth of the thermal power generator set participating in peak shaving is mainly limited by stable combustion of the boiler, and the solving ways are divided into two categories, namely, the stable combustion load of the boiler is reduced through the body modification of the boiler, particularly the stable combustion modification of a combustion system, so that the purpose of deep peak shaving is achieved; and secondly, the excess heat of the boiler is utilized by adopting a technical means, such as a reasonable heat supply mode or an energy storage mode. Meanwhile, the two ways are used simultaneously, so that the peak shaving depth of the unit can be further improved.
The energy storage technology mainly comprises the modes of pumped storage, compressed air storage, flywheel storage, electrochemical storage, heat storage and the like, and the storage is mainly carried out in the forms of potential energy, mechanical energy, electric energy and heat energy. In thermal power plants, heat storage is a relatively suitable form of energy storage. The fused salt energy storage system has mature commercial application in a solar photo-thermal power station, the heat storage temperature is matched with the temperature of a thermal power generator set, and the fused salt energy storage system is a relatively suitable high-grade heat energy storage mode. In addition, the specific heat capacity of water is large, so that the heat storage device has advantages in low-temperature heat storage application and is suitable for storing low-grade heat.
The double-medium heat storage is adopted, the double-tank molten salt stores high-grade heat, the water tank stores low-grade heat, the excess energy of the boiler is stored, the balance of the lowest stable operation load of the unit boiler and the steam turbine is achieved, heat is released during non-valley power utilization, steam is heated, the steam turbine is driven to do work, and therefore the purpose of deep, rapid and flexible peak regulation of the thermal power generator set is achieved under the condition of small energy loss.
Disclosure of Invention
The invention aims to provide a double-medium heat storage type peak-shaving thermal power generation system and a heat storage and release method.
The invention provides a double-medium heat storage type peak regulation thermal power generation system, which comprises a boiler 1, a steam turbine 2, a generator 3, a condenser 4, a condensate pump 5, a low-pressure heater group 6, a deaerator 7, a water feed pump 8, a high-pressure heater group 9, a high-temperature molten salt tank 12, a low-temperature molten salt tank 10, a low-temperature molten salt pump 11, a high-temperature molten salt pump 13, a first vapor-salt heat exchanger 14, a second vapor-salt heat exchanger 15, a third vapor-salt heat exchanger 16, a fourth vapor-salt heat exchanger 17, a phase change heat exchanger 18, a water-salt heat exchanger 19, a fifth vapor-salt heat exchanger 20, a vapor-water heat exchanger 21, a water tank 22, a hot water pump 23, a hot water supply pump 24 and a water-water heat exchanger 25; the concrete composition structure is as follows: a superheater 1-1 of a boiler 1 is connected with an inlet of a high-pressure cylinder 2-1 of a steam turbine 2 through a steam pipeline, an outlet of the high-pressure cylinder 2-1 is connected with an inlet of a reheater 1-2 of the boiler 1, and an outlet of the reheater 1-2 is connected with an inlet of an intermediate-pressure cylinder 2-2 of the steam turbine 2; the steam turbine 2 is mechanically connected with the generator 3, the exhaust steam of low-pressure cylinders 2-3 of the steam turbine 2 is connected to the condenser 4, the condensed water of the condenser 4 is connected with the condensed water pump 5 through a pipeline, and then is sequentially connected to the low-pressure heater group 6, the deaerator 7, the water feed pump 8 and the high-pressure heater 9 through pipelines, and finally is connected to the boiler 1 through a pipeline, so that the steam power circulation is realized; the low-temperature molten salt tank 10 is connected with a low-temperature molten salt pump 11 through a pipeline and then connected with a third vapor salt heat exchanger 16, a molten salt outlet pipeline of the third vapor salt heat exchanger 16 is divided into two paths, one path is connected with a second vapor salt heat exchanger 15, and the other path is connected with a first vapor salt heat exchanger 14; a molten salt outlet of the first steam-salt heat exchanger 14 is connected to the high-temperature molten salt tank 12 through a pipeline; a molten salt outlet of the second steam-salt heat exchanger 15 is connected to the high-temperature molten salt tank 12 through a pipeline; the steam inlet end of the first steam-salt heat exchanger 14 is connected to the outlet of a superheater 1-1 of the boiler 1 through a pipeline, and the steam outlet end of the first steam-salt heat exchanger 14 is connected to the inlet of a reheater 1-2 of the boiler 1 through a pipeline; the steam inlet end of the second steam-salt heat exchanger 15 is connected to an outlet of a reheater 1-2 of the boiler 1 through a pipeline, and a steam outlet is sequentially connected to a third steam-salt heat exchanger 16, a steam-water heat exchanger 21 and a water tank 22 through pipelines; a steam outlet of the second steam-salt heat exchanger 15 is connected to an inlet of the low-pressure cylinder 2-3 through a pipeline; the steam side outlet of the third steam-salt heat exchanger 16 is connected to the deaerator 7 through a pipeline; the high-temperature molten salt tank 12 is connected with the high-temperature molten salt pump 13 by a pipeline, and an outlet pipeline of the high-temperature molten salt pump 13 is divided into two paths: one path is connected to the fourth vapor-salt heat exchanger 17, the other path is connected to the fifth vapor-salt heat exchanger 20 through a pipeline, a molten salt outlet pipeline of the fourth vapor-salt heat exchanger 17 and a molten salt outlet pipeline of the fifth vapor-salt heat exchanger 20 are combined and then sequentially connected with the phase change heat exchanger 18 and the water-salt heat exchanger 19, and finally, the low-temperature molten salt tank 10 is connected through a pipeline. The steam inlet end of the fifth steam-salt heat exchanger 20 is connected to a steam exhaust pipeline of a high-pressure cylinder 2-1 of the steam turbine 2 through a pipeline, and the steam outlet end of the fifth steam-salt heat exchanger 20 is connected to the steam inlet end of a medium-pressure cylinder 2-2; the water inlet end of the water-salt heat exchanger 19 is connected to an outlet pipeline of the water feeding pump 8 through a pipeline, and the water outlet end of the water-salt heat exchanger 19 is sequentially connected to the phase change heat exchanger 18, the fourth steam-salt heat exchanger 17 and the high-pressure cylinder 2-1 through pipelines; the water tank 22 is connected with a hot water pump 23, a steam-water heat exchanger 21 and a deaerator 7 in sequence through pipelines.
Further, the system also comprises a pipeline arranged between a hot water outlet of the steam-water heat exchanger 21 and an inlet of the steam-water heat exchanger 21.
Further, the water tank 22 is connected to a hot water supply pump 24 and a water-water heat exchanger 25 in this order by pipes, and is connected to the return water tank 22.
Further, the outlet of the condensate pump 5 is piped to the water tank 22.
Optionally, the exhaust steam of the low-pressure cylinder 2-3 of the steam turbine 2 is connected to a condenser 4, the condensed water of the condenser 4 is connected to a condensed water pump 5 through a pipeline, and then is sequentially connected to a low-pressure heater group 6, a deaerator 7, a water feed pump 8 and a high-pressure heater group 9 through pipelines, and finally is connected to the boiler 1 through a pipeline, so that steam power circulation is realized.
According to the double-medium heat storage type peak regulation thermal power generation system, steam flowing out of a superheater 1-1 of a boiler 1 is divided into two paths, one path of the steam enters a high-pressure cylinder 2-1 of a steam turbine 2 to do work, and the other path of the steam enters a first steam-salt heat exchanger 14 to heat molten salt and then returns to an inlet of a reheater 1-2 of the boiler; the steam at the outlet of the boiler reheater 1-2 is divided into two paths, one path enters a steam turbine intermediate pressure cylinder 2-2 to do work, and the other path flows through a second steam-salt heat exchanger 15, a third steam-salt heat exchanger 16 and a steam-water heat exchanger 21 in sequence to release heat and then converges into a water tank 22; steam at the outlet of the second steam-salt heat exchanger 15 enters the low-pressure cylinder 2-3 to continuously do work; the low-temperature molten salt in the low-temperature molten salt tank 10 is subjected to pressure boosting through a low-temperature molten salt pump 11 and then passes through a third vapor-salt heat exchanger 16, and then is divided into two paths: one path flows through the second vapor-salt heat exchanger 15 to reversely exchange heat with the steam and then flows to the high-temperature molten salt tank 12, and the other path flows through the first vapor-salt heat exchanger 14 to absorb heat and then flows to the high-temperature molten salt tank 12; after being pressurized by the hot water pump 23, water in the water tank 22 enters the steam-water heat exchanger 21 to absorb heat, part of hot water after absorbing heat enters the deaerator 7, and the other part of hot water enters the water tank 22; and realizing the heat storage process of the system.
According to the double-medium heat storage type peak regulation thermal power generation system, high-temperature molten salt stored in a high-temperature molten salt tank 12 of the system is boosted by a high-temperature molten salt pump 13 and then divided into two paths: the first path enters a fourth vapor-salt heat exchanger 17 in sequence, releases the heat of the molten salt and then flows out from a molten salt outlet of the fourth vapor-salt heat exchanger 17; the second path enters a fifth vapor-salt heat exchanger 20, releases the heat of the molten salt and flows out through a molten salt outlet of the fifth vapor-salt heat exchanger 20; after being mixed, the molten salt flowing out of the molten salt outlet of the fourth vapor-salt heat exchanger 17 and the molten salt flowing out of the molten salt outlet of the fifth vapor-salt heat exchanger 20 sequentially pass through the phase change heat exchanger 18 and the water-salt heat exchanger 19 to release the heat of the molten salt, and the formed low-temperature molten salt flows to the low-temperature molten salt tank 10; the two molten salt flows realize the heat release flow of the molten salt; boiler feed water from a feed water pump 8 firstly flows through a water-salt heat exchanger 19 to be preheated, preheated water flows are evaporated into steam through a phase change heat exchanger 18, the steam flows through a fourth steam-salt heat exchanger 17 to be superheated, and the generated superheated steam is mixed with superheated steam produced by a boiler superheater 1-1 and is sent to a high-pressure cylinder 2-1 of a steam turbine 2 to do work; after exhaust steam from the high-pressure cylinder 2-1 enters the fifth steam-salt heat exchanger 20 to absorb heat of molten salt, the temperature is increased, and the exhaust steam is mixed with steam at the outlet of the boiler reheater 1-2 and sent to the intermediate-pressure cylinder 2-2 to do work; after the pressure of the hot water in the water tank 22 is increased by the hot water pump 23, the hot water enters a deaerator to release the heat in the hot water; after the pressure of the hot water in the water tank 22 is increased by the hot water supply pump 24, heat is released by the water-water heat exchanger 25; the above flow realizes the heat release flow of the system.
The heat storage and release method of the double-medium heat storage type peak regulation thermal power generation system is characterized in that when the power generation system is used, and the stable combustion load of the boiler 1 is larger than the load demand of the steam turbine 2, the part of the boiler 1 with the heat output larger than the demand of the steam turbine 2 is stored in a molten salt and water double-medium heat storage mode; when the heat demand of the steam turbine 2 is higher than the stable combustion load of the boiler 1, the heat stored in the molten salt and the water is released, the molten salt heat heats the feed water and the steam to generate high-temperature steam, the high-temperature steam is sent to the steam turbine 2 to do work, and the heat of the water is sent to the deaerator 7 to heat the feed water or is sent to the water-water heat exchanger 25 to supply heat; in the heat storage process, a heat storage system consisting of a first steam-salt heat exchanger 14, a second steam-salt heat exchanger 15, a third steam-salt heat exchanger 16, a steam-water heat exchanger 21 and a connecting pipeline is connected in parallel with a steam turbine system consisting of a high-pressure cylinder 2-1, an intermediate-pressure cylinder 2-2, a low-pressure cylinder 2-3 and a connecting pipeline, and steam at the outlets of a superheater 1-1 and a reheater 1-2 of a boiler 1 is respectively sent to a steam turbine 2 to do work and store molten salt heat and hot water heat; in the heat release process, a boiler system comprising a superheater 1-1 and a reheater 1-2 and a molten salt boiler system comprising a fourth vapor-salt heat exchanger 17, a phase change heat exchanger 18, a water-salt heat exchanger 19, a fifth vapor-salt heat exchanger 20 and a connecting pipeline are connected in parallel, and steam at an outlet of the boiler superheater 1-1 and steam at an outlet of the fourth vapor-salt heat exchanger 17 are mixed and enter a high-pressure cylinder 2-1 of the steam turbine for acting; steam at the outlet of the boiler reheater 1-2 and steam at the outlet of the fifth steam-salt heat exchanger 20 are mixed and enter the intermediate pressure cylinder 2-2 to do work, and hot water from the water tank 22 enters the deaerator 7 to be mixed and release heat.
The heat storage and release method of the double-medium heat storage type peak regulation thermal power generation system comprises the following two parts: the first part is that the superheated steam of the 1-1 outlet port of the superheater of the boiler 1 enters the first steam-salt heat exchanger 14, the steam after releasing heat returns to the inlet of the reheater 1-2, the low-temperature molten salt enters the first steam-salt heat exchanger 14 through the third steam-salt heat exchanger 16 after being boosted by the low-temperature molten salt pump 11 from the low-temperature molten salt tank 10, and the high-temperature molten salt after absorbing heat flows into the high-temperature molten salt tank 12 for storage; the second part is that the reheated steam at the outlet of the reheater 1-2 of the boiler 1 sequentially enters a second steam-salt heat exchanger 15 and a third steam-salt heat exchanger 16 to release heat, the low-temperature molten salt is boosted by a low-temperature molten salt pump 11 from a low-temperature molten salt tank 10 and then sequentially enters the third steam-salt heat exchanger 16 and the second steam-salt heat exchanger 15 in a countercurrent mode, and the high-temperature molten salt after heat absorption flows into a high-temperature molten salt tank 12 to be stored; part of steam at the outlet of the second steam-salt heat exchanger 15 can enter the low-pressure cylinder 2-3 through a pipeline to do work; steam at the outlet of the third steam-salt heat exchanger 16 is cooled by the steam-water heat exchanger 21 and then mixed with condensed water at the outlet of the condensed water pump 5, and then low-grade heat is stored in the water tank 22; part of steam at the outlet of the third steam-salt heat exchanger 16 directly enters the deaerator 7.
According to the heat storage and release method of the double-medium heat storage type peak regulation thermal power generation system, the high-grade heat release process is divided into two parts: the first part is that the high-temperature molten salt of the high-temperature molten salt tank 12 is boosted by a high-temperature molten salt pump 13 and then flows through a fourth vapor-salt heat exchanger 17, a phase change heat exchanger 18 and a water-salt heat exchanger 19 in sequence, and the low-temperature molten salt after heat release flows into the low-temperature molten salt tank 10; the feed water from the feed water pump 8 sequentially flows through the water-salt heat exchanger 19, the phase change heat exchanger 18 and the fourth steam-salt heat exchanger 17 to absorb heat, generate superheated steam, and is mixed with the superheated steam generated by the boiler superheater 1-1 and then sent to the inlet of the high-pressure cylinder 2-1 of the steam turbine; the second part is that the high-temperature molten salt in the high-temperature molten salt tank 12 flows into the fifth vapor salt heat exchanger 20 after being boosted by the high-temperature molten salt pump 13, then flows through the phase change heat exchanger 18 and the water salt heat exchanger 19 in sequence, and the low-temperature molten salt after releasing heat flows into the low-temperature molten salt tank 10; the exhausted steam from the high-pressure cylinder 2-1 enters the intermediate-pressure cylinder 2-2 to do work after absorbing heat through the fifth steam-salt heat exchanger 20; there are two ways to release low grade heat: the first mode is that hot water enters the deaerator 7 after being pressurized by the hot water pump 23 from the water tank 22; in the second mode, hot water in the water tank 22 is sent to the water-water heat exchanger 25 to release heat after being pressurized by the hot water supply pump 24, the heat is used for supplying heat, and return water returns to the water tank 22.
The invention has the beneficial effects that:
the invention relates to a double-medium heat storage type peak regulation thermal power generation system and a heat storage and release method. According to the invention, under the condition that the lowest stable operation load of the boiler and the steam turbine is not matched, part of high-grade heat of the boiler higher than the load requirement of the steam turbine is stored in the molten salt heat storage system in a high-temperature mode, and low-grade heat is stored in the water tank, so that the thermal power generator set supplies power to a power grid at the lowest load of the steam turbine, and the purpose of deep peak regulation of the thermal power generator set is achieved. During the load valley period of the power grid, the rapid load reduction capability of the thermal power generator unit is greatly improved through the parallel operation of the energy storage system and the steam turbine generator unit. During the period of low load cost of the power grid, the rapid load-increasing capacity of the thermal power generator set is greatly improved through the parallel operation of the energy storage system and the boiler system. Because the heat storage temperature is matched with the main steam and the reheated steam temperature of the steam turbine generator set, the loss of the work capacity of the boiler heat can be greatly reduced. The invention is not only suitable for the newly built thermal power generation system with deep peak regulation capability, but also can be used for the deep peak regulation reconstruction of the existing thermal power generation system.
Drawings
Fig. 1 is a schematic structural form diagram of a dual-medium heat storage type deep flexible peak shaving thermal power generation system.
In the figure, a boiler 1, a superheater 1-1, a reheater 1-2, a steam turbine 2, a high-pressure cylinder 2-1, a medium-pressure cylinder 2-2, a low-pressure cylinder 2-3, a generator 3, a condenser 4, a condensate pump 5, a low-pressure heater group 6, a deaerator 7, a water feed pump 8, a high-pressure heater group 9, a low-temperature molten salt tank 10, a low-temperature molten salt pump 11, a high-temperature molten salt tank 12, a high-temperature molten salt pump 13, a first vapor-salt heat exchanger 14, a second vapor-salt heat exchanger 15, a third vapor-salt heat exchanger 16, a fourth vapor-salt heat exchanger 17, a phase change heat exchanger 18, a water-salt heat exchanger 19, a fifth vapor-salt heat exchanger 20, a vapor-water heat exchanger 21, a water tank 22, a hot water pump 23, a hot water pump 24 and a water heat exchanger 25 are included.
Detailed Description
The invention provides a double-medium heat storage type deep flexible peak regulation thermal power generation system and a heat storage and release method.
The invention is described in further detail below with reference to the figures and specific embodiments.
Example 1
Fig. 1 is a schematic diagram of a structural form of a heat storage type deep flexible peak shaving thermal power generation system, and the system is composed of a boiler 1, a steam turbine 2, a condenser 4, a generator 3, a condensate pump 5, a low-pressure heater group 6, a deaerator 7, feed water 8, a high-pressure heater group 9, a high-temperature molten salt tank 12, a low-temperature molten salt tank 10, a low-temperature molten salt pump 11, a high-temperature molten salt pump 13, a first vapor-salt heat exchanger 14, a second vapor-salt heat exchanger 15, a fourth vapor-salt heat exchanger 17, a water salt heat exchanger 19, a third vapor-salt heat exchanger 16, a phase change heat exchanger 18, a fifth vapor-salt heat exchanger 20, a vapor-water heat exchanger 21, a water tank 22, a hot water pump 23, a hot water supply pump 24, a water-water heat exchanger 25, pipelines, other valves and accessories.
The structure and connection relationship of the system of the embodiment are as follows: a superheater 1-1 of a boiler 1 is connected with an inlet of a high-pressure cylinder 2-1 of a steam turbine 2 through a steam pipeline, an outlet of the high-pressure cylinder 2-1 is connected with an inlet of a reheater 1-2 of the boiler 1, and an outlet of the reheater 1-2 is connected with an inlet of an intermediate-pressure cylinder 2-2 of the steam turbine 2; the steam turbine 2 is mechanically connected with the generator 3, the exhaust steam of low-pressure cylinders 2-3 of the steam turbine 2 is connected to the condenser 4, the condensed water of the condenser 4 is connected with the condensed water pump 5 through a pipeline, and then is sequentially connected to the low-pressure heater group 6, the deaerator 7, the water feed pump 8 and the high-pressure heater group 9 through pipelines, and finally is connected to the boiler 1 through a pipeline, so that the steam power circulation is realized; the low-temperature molten salt tank 10 is connected with a low-temperature molten salt pump 11 through a pipeline and then connected with a third vapor salt heat exchanger 16, a molten salt outlet pipeline of the third vapor salt heat exchanger 16 is divided into two paths, one path is connected with a second vapor salt heat exchanger 15, and the other path is connected with a first vapor salt heat exchanger 14. The molten salt outlet of the first steam-salt heat exchanger 14 is connected to the high-temperature molten salt tank 12 through a pipeline. The molten salt outlet of the second steam-salt heat exchanger 15 is connected to the high-temperature molten salt tank 12 through a pipeline. The steam inlet end of the first steam-salt heat exchanger 14 is connected to the outlet of a superheater 1-1 of the boiler 1 through a pipeline, and the steam outlet end of the first steam-salt heat exchanger 14 is connected to the inlet of a reheater 1-2 of the boiler 1 through a pipeline; the steam inlet end of the second steam-salt heat exchanger 15 is connected to an outlet of a reheater 1-2 of the boiler 1 through a pipeline, and a steam outlet of the second steam-salt heat exchanger 15 is sequentially connected to a third steam-salt heat exchanger 16, a steam-water heat exchanger 21 and a water tank 22 through pipelines; the steam at the outlet of the second steam-salt heat exchanger 15 is connected to the inlet of the low pressure cylinder 2-3 through a pipeline; the steam side outlet of the third steam-salt heat exchanger 16 is connected to the deaerator 7 through a pipeline; the high-temperature molten salt tank 12 is connected with a high-temperature molten salt pump 13 through a pipeline. The outlet pipeline of the high-temperature molten salt pump 13 is divided into two paths: one path is connected to the fourth vapor-salt heat exchanger 17 in sequence, and the other path is connected to the fifth vapor-salt heat exchanger 20 by a pipeline. The fourth vapor-salt heat exchanger 17 fused salt outlet pipeline and the fifth vapor-salt heat exchanger 20 fused salt outlet pipeline are combined and then sequentially connected with the phase change heat exchanger 18 and the water-salt heat exchanger 19, and finally are connected to the low-temperature fused salt tank 10 through pipelines. The steam inlet end of the fifth steam-salt heat exchanger 20 is connected to a steam exhaust pipeline of a high-pressure cylinder 2-1 of the steam turbine 2 through a pipeline, and the steam outlet end of the fifth steam-salt heat exchanger 20 is connected to the steam inlet end of a medium-pressure cylinder 2-2; the water inlet end of the water-salt heat exchanger 19 is connected to an outlet pipeline of the water feeding pump 8 through a pipeline, and the water outlet end of the water-salt heat exchanger 19 is sequentially connected to the phase change heat exchanger 18, the fourth steam-salt heat exchanger 17 and the high-pressure cylinder 2-1 through pipelines; the water tank 22 is connected with a hot water pump 23, a steam-water heat exchanger 21 and a deaerator 7 in sequence through pipelines. A pipeline connection is arranged between the hot water outlet of the steam-water heat exchanger 21 and the inlet of the steam-water heat exchanger 21. The water tank 22 is sequentially connected with a hot water supply pump 24 and a water-water heat exchanger 25 through pipelines and is connected with the water return tank 22; the outlet of the condensate pump 5 is connected to the water tank 22 through a pipeline.
The heat storage working medium flow of the embodiment is as follows: the steam flowing out of the superheater 1-1 of the boiler 1 is divided into two paths, one path of the steam enters a high-pressure cylinder 2-1 of a steam turbine 2 to do work, and the other path of the steam enters a first steam-salt heat exchanger 14 to heat molten salt and then returns to an inlet of a reheater 1-2 of the boiler; the steam at the outlet of the boiler reheater 1-2 is divided into two paths, one path enters a steam turbine intermediate pressure cylinder 2-2 to do work, and the other path flows through a second steam-salt heat exchanger 15, a third steam-salt heat exchanger 16 and a steam-water heat exchanger 21 in sequence to release heat and then converges into a water tank 22; steam at the outlet of the second steam-salt heat exchanger 15 enters the low-pressure cylinder 2-3 to continuously do work; the low-temperature molten salt in the low-temperature molten salt tank 10 is subjected to pressure boosting through a low-temperature molten salt pump 11 and then passes through a third vapor-salt heat exchanger 16, and then is divided into two paths: one path flows through the second vapor-salt heat exchanger 15 to reversely exchange heat with the steam and then flows to the high-temperature molten salt tank 12, and the other path flows through the first vapor-salt heat exchanger 14 to absorb heat and then flows to the high-temperature molten salt tank 12; the water in the water tank 22 is pressurized by the hot water pump 23 and then enters the steam-water heat exchanger 21 to absorb heat, and a part of hot water after absorbing heat enters the deaerator 7 and a part of hot water enters the water tank 22; and realizing the storage process of the system heat.
The heat release working medium flow of the embodiment: the high-temperature molten salt stored in the high-temperature molten salt tank 12 of the system is boosted by a high-temperature molten salt pump 13 and then divided into two paths: the first path enters the fourth vapor-salt heat exchanger 17 in sequence, releases the heat of the molten salt, and then flows out through the molten salt outlet of the fourth vapor-salt heat exchanger 17. The second path enters the fifth vapor-salt heat exchanger 20 to discharge molten salt heat, and flows out through a molten salt outlet of the fifth vapor-salt heat exchanger 20. After being mixed, the molten salt flowing out of the molten salt outlet of the fourth vapor-salt heat exchanger 17 and the molten salt flowing out of the molten salt outlet of the fifth vapor-salt heat exchanger 20 sequentially pass through the phase change heat exchanger 18 and the water-salt heat exchanger 19 to release the heat of the molten salt, and the formed low-temperature molten salt flows to the low-temperature molten salt tank 10; the two molten salt flows realize the heat release flow of the molten salt; boiler feed water from a feed water pump 8 firstly flows through a water-salt heat exchanger 19 to be preheated, preheated water flows are evaporated into steam through a phase change heat exchanger 18, the steam flows through a fourth steam-salt heat exchanger 17 to be superheated, and the generated superheated steam is mixed with superheated steam produced by a boiler superheater 1-1 and is sent to a high-pressure cylinder 2-1 of a steam turbine 2 to do work; after exhaust steam from the high-pressure cylinder 2-1 enters the fifth steam-salt heat exchanger 20 to absorb heat of molten salt, the temperature is increased, and the exhaust steam is mixed with steam at the outlet of the boiler reheater 1-2 and sent to the intermediate-pressure cylinder 2-2 to do work; after the pressure of the hot water in the water tank 22 is increased by the hot water pump 23, the hot water enters a deaerator to release the heat in the hot water; after the pressure of the hot water in the water tank 22 is increased by the hot water supply pump 24, heat is released by the water-water heat exchanger 25; the above flow realizes the heat release flow of the system.
The heat storage and release method of the embodiment comprises the following steps: when the stable combustion load of the boiler 1 is larger than the load requirement of the steam turbine 2, the part of the boiler 1 with the heat output more than the requirement of the steam turbine 2 is stored in a molten salt and water double-medium heat storage mode; when the heat demand of the steam turbine 2 is higher than the stable combustion load of the boiler 1, the heat stored in the molten salt and the water is released, the molten salt heat heats the feed water and the steam to generate high-temperature steam, the high-temperature steam is sent to the steam turbine 2 to do work, the heat of the water is sent to the deaerator 7 to heat the feed water, and the heat of the water can also be sent to the water-water heat exchanger 25 to supply heat; in the heat storage process, a heat storage system consisting of a first steam-salt heat exchanger 14, a second steam-salt heat exchanger 15, a third steam-salt heat exchanger 16, a steam-water heat exchanger 21 and a connecting pipeline is connected in parallel with a steam turbine system consisting of a high-pressure cylinder 2-1, an intermediate-pressure cylinder 2-2, a low-pressure cylinder 2-3 and a connecting pipeline, and steam at the outlets of a superheater 1-1 and a reheater 1-2 of a boiler 1 is respectively sent to a steam turbine 2 to do work and store molten salt heat and hot water heat; in the heat release process, a boiler system comprising a superheater 1-1 and a reheater 1-2 and a molten salt boiler system comprising a fourth vapor-salt heat exchanger 17, a phase change heat exchanger 18, a water-salt heat exchanger 19, a fifth vapor-salt heat exchanger 20 and a connecting pipeline are connected in parallel, and steam at an outlet of the boiler superheater 1-1 and steam at an outlet of the fourth vapor-salt heat exchanger 17 are mixed and enter a high-pressure cylinder 2-1 of the steam turbine for acting; steam at the outlet of the boiler reheater 1-2 and steam at the outlet of the fifth steam-salt heat exchanger 20 are mixed and enter the intermediate pressure cylinder 2-2 to do work, and hot water from the water tank 22 enters the deaerator 7 to be mixed and release heat. The method solves the contradiction of different lowest stable operation loads of the boiler and the steam turbine, can carry out deep peak shaving according to the lowest load of the steam turbine 2, reduces heat loss during peak shaving and improves the fuel utilization rate.
The heat storage method of the embodiment: the high-grade heat storage process is divided into two parts: the first part is that the superheated steam of the 1-1 outlet port of the superheater of the boiler 1 enters the first steam-salt heat exchanger 14, the steam temperature after releasing heat matches the outlet port temperature of the high-pressure cylinder 2-1, the steam after mixing returns to the inlet of the reheater 1-2, the low-temperature molten salt of 170 ℃ enters the first steam-salt heat exchanger 14 after passing through the third steam-salt heat exchanger 16 after the low-temperature molten salt from the low-temperature molten salt tank 10 is boosted by the low-temperature molten salt pump 11, and the high-temperature molten salt of 530 ℃ flows into the high-temperature molten salt tank 12 after absorbing heat and is stored; the second part is that the reheated steam at the outlet of the reheater 1-2 of the boiler 1 sequentially enters a second steam-salt heat exchanger 15 and a third steam-salt heat exchanger 16 to release heat, the low-temperature molten salt at the temperature of 170 ℃ is boosted by a low-temperature molten salt pump 11 from a low-temperature molten salt tank 10 and then reversely flows into the third steam-salt heat exchanger 16 and the second steam-salt heat exchanger 15 sequentially, and the high-temperature molten salt at the temperature of 530 ℃ flows into a high-temperature molten salt tank 12 to be stored after absorbing heat; part of steam at the outlet of the second steam-salt heat exchanger 15 can enter the low-pressure cylinder 2-3 to do work; steam at the outlet of the third steam-salt heat exchanger 16 is cooled by the steam-water heat exchanger 21 and then mixed with condensed water at the outlet of the condensed water pump 5, and then low-grade heat is stored in the water tank 22; part of steam at the outlet of the third steam-salt heat exchanger 16 directly enters the deaerator 7.
The heat release method of the present example: the high-grade heat releasing process is divided into two parts: the first part is that the 530 ℃ high-temperature molten salt in the high-temperature molten salt tank 12 is boosted by the high-temperature molten salt pump 13 and then flows through the fourth vapor-salt heat exchanger 17, the phase change heat exchanger 18 and the water-salt heat exchanger 19 in sequence, and the 170 ℃ low-temperature molten salt flows into the low-temperature molten salt tank 10 after releasing heat; the feed water from the feed water pump 8 sequentially flows through the water-salt heat exchanger 19, the phase change heat exchanger 18 and the fourth steam-salt heat exchanger 17 to absorb heat, generate superheated steam, and is mixed with the superheated steam generated by the boiler superheater 1-1 and then sent to the inlet of the high-pressure cylinder 2-1 of the steam turbine; the second part is that the 530 ℃ high-temperature molten salt in the high-temperature molten salt tank 12 flows into the fifth vapor-salt heat exchanger 20 after being boosted by the high-temperature molten salt pump 13, then flows through the phase change heat exchanger 18 and the water-salt heat exchanger 19 in sequence, and flows into the low-temperature molten salt tank 10 after releasing heat and the 170 ℃ low-temperature molten salt; the exhausted steam from the high-pressure cylinder 2-1 enters the intermediate-pressure cylinder 2-2 to do work after absorbing heat through the fifth steam-salt heat exchanger 20; there are two ways to release low grade heat: the first mode is that hot water enters the deaerator 7 after being pressurized by the hot water pump 23 from the water tank 22; in the second mode, hot water in the water tank 22 is sent to the water-water heat exchanger 25 to release heat after being pressurized by the hot water supply pump 24, the heat is used for supplying heat, and return water returns to the water tank 22.
The invention has not been described in detail and is part of the common general knowledge of a person skilled in the art. The above-described embodiments are merely illustrative of the preferred embodiments of the present invention, and the preferred embodiments are not exhaustive and do not limit the invention to the precise embodiments described. Various modifications and improvements of the technical solution of the present invention may be made by those skilled in the art without departing from the spirit of the present invention, and the technical solution of the present invention is to be covered by the protection scope defined by the claims.
Claims (9)
1. A double-medium heat storage type peak shaving thermal power generation system is characterized by comprising a boiler (1), a steam turbine (2), a generator (3), a condenser (4), a condensate pump (5), a low-pressure heater group (6), a deaerator (7), a water feeding pump (8), a high-pressure heater group (9), a high-temperature molten salt tank (12), a low-temperature molten salt tank (10), a low-temperature molten salt pump (11), a high-temperature molten salt pump (13), a first vapor-salt heat exchanger (14), a second vapor-salt heat exchanger (15), a third vapor-salt heat exchanger (16), a fourth vapor-salt heat exchanger (17), a phase change heat exchanger (18), a water-salt heat exchanger (19), a fifth vapor-salt heat exchanger (20), a vapor-water heat exchanger (21), a water tank (22), a hot water pump (23), a hot water supply pump (24) and a water-water heat exchanger (25); wherein, a superheater (1-1) of the boiler (1) is connected with an inlet of a high-pressure cylinder (2-1) of a steam turbine (2) through a steam pipeline, an outlet of the high-pressure cylinder (2-1) is connected with an inlet of a reheater (1-2) of the boiler (1), and an outlet of the reheater (1-2) is connected with an inlet of an intermediate pressure cylinder (2-2) of the steam turbine (2); the steam turbine (2) is connected with the generator (3) in a mechanical mode, the exhaust steam of a low-pressure cylinder (2-3) of the steam turbine (2) is connected to the condenser (4), the condensed water of the condenser (4) is connected with the condensed water pump (5) through a pipeline, and then is sequentially connected to the low-pressure heater group (6), the deaerator (7), the water feed pump (8) and the high-pressure heater group (9) through pipelines, and finally is connected to the boiler (1) through a pipeline, so that the steam power circulation is realized; the low-temperature molten salt tank (10) is connected with a low-temperature molten salt pump (11) through a pipeline and then connected with a third vapor-salt heat exchanger (16); a molten salt outlet pipeline of the third vapor-salt heat exchanger (16) is divided into two paths, one path is connected with the second vapor-salt heat exchanger (15), and the other path is connected with the first vapor-salt heat exchanger (14); a molten salt outlet of the second steam-salt heat exchanger (15) is connected to the high-temperature molten salt tank (12); a molten salt outlet of the first steam-salt heat exchanger (14) is connected to the high-temperature molten salt tank (12); the steam inlet end of the first steam-salt heat exchanger (14) is connected to the outlet of a superheater (1-1) of the boiler (1) through a pipeline, and the steam outlet end of the first steam-salt heat exchanger (14) is connected to the inlet of a reheater (1-2) of the boiler (1) through a pipeline; the steam inlet end of the second steam-salt heat exchanger (15) is connected to the outlet of a reheater (1-2) of the boiler (1) through a pipeline, and the steam outlet of the second steam-salt heat exchanger (15) is sequentially connected to a third steam-salt heat exchanger (16), a steam-water heat exchanger (21) and a water tank (22) through pipelines; the steam outlet of the second steam-salt heat exchanger (15) is connected to the inlet of the low-pressure cylinder (2-3) through a pipeline; a steam side outlet of the third steam-salt heat exchanger (16) is connected to the deaerator (7) through a pipeline; the high-temperature molten salt tank (12) is connected with the high-temperature molten salt pump (13) through a pipeline, and an outlet pipeline of the high-temperature molten salt pump (13) is divided into two paths: one path is connected to a fourth vapor-salt heat exchanger (17), and the other path is connected to a fifth vapor-salt heat exchanger (20) through a pipeline; a molten salt outlet pipeline of the fourth vapor-salt heat exchanger (17) and a molten salt outlet pipeline of the fifth vapor-salt heat exchanger (20) are combined and then sequentially connected with the phase change heat exchanger (18) and the water-salt heat exchanger (19), and finally connected to the low-temperature molten salt tank (10) through pipelines; the steam inlet end of the fifth steam-salt heat exchanger (20) is connected to a steam exhaust pipeline of a high-pressure cylinder (2-1) of the steam turbine (2) through a pipeline, and the steam outlet end of the fifth steam-salt heat exchanger (20) is connected to the steam inlet end of the medium-pressure cylinder (2-2); the water inlet end of the water-salt heat exchanger (19) is connected to an outlet pipeline of the water feeding pump (8) through a pipeline, and the water outlet end of the water-salt heat exchanger (19) is sequentially connected to the phase change heat exchanger (18), the fourth vapor-salt heat exchanger (17) and the high-pressure cylinder (2-1) through pipelines; the water tank (22) is sequentially connected with a hot water pump (23), a steam-water heat exchanger (21) and a deaerator (7) through pipelines.
2. The dual-medium thermal storage type peak shaving thermal power generation system according to claim 1, further comprising a pipeline connection arranged between a hot water outlet of the steam-water heat exchanger (21) and an inlet of the steam-water heat exchanger (21).
3. The peak shaver thermal power generation system according to claim 1, wherein the water tank (22) is connected with the hot water supply pump (24) and the water-water heat exchanger (25) in sequence by pipelines and is connected with the water return tank (22); the outlet of the condensate pump (5) is connected with a water tank (22) through a pipeline.
4. The double-medium heat storage type peak shaving thermal power generation system according to claim 1, wherein steam flowing out of a superheater (1-1) of a boiler (1) is divided into two paths, one path of the steam enters a high-pressure cylinder (2-1) of a steam turbine (2) to do work, and the other path of the steam enters a first steam-salt heat exchanger (14) to heat molten salt and then returns to an inlet of a reheater (1-2) of the boiler; steam at the outlet of the boiler reheater (1-2) is divided into two paths, one path of the steam enters a steam turbine intermediate pressure cylinder (2-2) to do work, and the other path of the steam sequentially flows through a second steam-salt heat exchanger (15), a third steam-salt heat exchanger (16) and a steam-water heat exchanger (21) to release heat and then converges into a water tank (22); steam at the outlet of the second steam-salt heat exchanger (15) enters a low-pressure cylinder (2-3) to continuously do work; the low-temperature molten salt in the low-temperature molten salt tank (10) is boosted by a low-temperature molten salt pump (11) and passes through a third vapor-salt heat exchanger (16), and then is divided into two paths: one path flows through the second vapor-salt heat exchanger (15) to reversely exchange heat with steam and then flows to the high-temperature molten salt tank (12), and the other path flows through the first vapor-salt heat exchanger (14) to absorb heat and then flows to the high-temperature molten salt tank (12); the water in the water tank (22) is pressurized by the hot water pump (23) and then enters the steam-water heat exchanger (21) to absorb heat, one part of the hot water after heat absorption enters the deaerator (7), and the other part of the hot water enters the water tank (22); and realizing the heat storage process of the system.
5. The dual-medium thermal storage type peak regulation thermal power generation system according to claim 1, wherein the high-temperature molten salt stored in the high-temperature molten salt tank (12) of the system is boosted by a high-temperature molten salt pump (13) and then divided into two paths: the first path enters a fourth vapor-salt heat exchanger (17), releases the heat of the molten salt and then flows out through a molten salt outlet of the fourth vapor-salt heat exchanger (17); the second path enters a fifth vapor-salt heat exchanger (20), releases the heat of the molten salt and flows out through a molten salt outlet of the fifth vapor-salt heat exchanger (20); after molten salt flowing out of a molten salt outlet of the fourth steam-salt heat exchanger (17) is mixed with molten salt flowing out of a molten salt outlet of the fifth steam-salt heat exchanger (20), the molten salt sequentially passes through a phase change heat exchanger (18) and a water-salt heat exchanger (19), heat of the molten salt is released, and formed low-temperature molten salt flows to a low-temperature molten salt tank (10); the two molten salt flows realize the heat release flow of the molten salt; boiler feed water from a feed water pump (8) firstly flows through a water-salt heat exchanger (19) for preheating, preheated water flow is evaporated into steam through a phase change heat exchanger (18), the steam flows through a fourth steam-salt heat exchanger (17) for superheating, and the generated superheated steam is mixed with superheated steam produced by a boiler superheater (1-1) and is sent to a high-pressure cylinder (2-1) of a steam turbine (2) for doing work; after exhaust steam from the high-pressure cylinder (2-1) enters the fifth steam-salt heat exchanger (20) to absorb heat of molten salt, the temperature is increased, and the exhaust steam is mixed with steam at the outlet of the boiler reheater (1-2) and sent to the intermediate-pressure cylinder (2-2) to do work; hot water in the water tank (22) is pressurized by the hot water pump (23) and then enters the deaerator to release heat in the hot water; the hot water in the water tank (22) is pressurized by a hot water supply pump (24) and then is discharged heat by a water-water heat exchanger (25); the above process realizes the heat release process of the system.
6. A heat storage and release method of a double-medium heat storage type peak-shaving thermal power generation system is characterized in that by using the power generation system as claimed in any one of claims 1 to 5, when the stable combustion load of a boiler (1) is larger than the load demand of a steam turbine (2), a part of the output heat of the boiler (1) which is larger than the demand of the steam turbine (2) is stored by adopting a molten salt and water double-medium heat storage mode; when the heat demand of the steam turbine (2) is higher than the stable combustion load of the boiler (1), releasing the heat stored in the molten salt and the water, heating the feed water and the steam by the heat of the molten salt to generate high-temperature steam, sending the high-temperature steam into the steam turbine (2) to do work, and sending the heat of the water into a deaerator (7) to heat the feed water or a water-water heat exchanger (25) to supply heat; in the heat storage process, a heat storage system consisting of a first steam-salt heat exchanger (14), a second steam-salt heat exchanger (15), a third steam-salt heat exchanger (16), a steam-water heat exchanger (21) and a connecting pipeline is connected in parallel with a steam turbine system consisting of a high-pressure cylinder (2-1), an intermediate-pressure cylinder (2-2), a low-pressure cylinder (2-3) and a connecting pipeline, and steam at the outlets of a superheater (1-1) and a reheater (1-2) of a boiler (1) is respectively sent to a steam turbine (2) to do work, store molten salt and store hot water; the heat release process adopts a parallel connection mode of a boiler system comprising a superheater (1-1) and a reheater (1-2) and a molten salt boiler system comprising a fourth vapor-salt heat exchanger (17), a phase change heat exchanger (18), a water-salt heat exchanger (19), a fifth vapor-salt heat exchanger (20) and a connecting pipeline, and outlet steam of the boiler superheater (1-1) and outlet steam of the fourth vapor-salt heat exchanger (17) are mixed and enter a high-pressure cylinder (2-1) of the steam turbine to do work; steam at the outlet of the boiler reheater (1-2) and steam at the outlet of the fifth steam-salt heat exchanger (20) are mixed and enter the intermediate pressure cylinder (2-2) to do work, and hot water from the water tank (22) enters the deaerator (7) to be mixed and release heat.
7. The heat storage and release method of the double-medium heat storage type peak shaving thermal power generation system according to claim 6, wherein the high-grade heat storage process is divided into two parts: the first part is that the superheated steam of the superheater (1-1) outlet of the boiler (1) enters a first vapor-salt heat exchanger (14), the steam after releasing heat returns to the inlet of a reheater (1-2), the low-temperature molten salt is boosted by a low-temperature molten salt pump (11) from a low-temperature molten salt tank (10) and then enters the first vapor-salt heat exchanger (14) through a third vapor-salt heat exchanger (16), and the high-temperature molten salt after absorbing heat flows into a high-temperature molten salt tank (12) for storage; the second part is that the reheated steam at the outlet of a reheater (1-2) of the boiler (1) sequentially enters a second steam-salt heat exchanger (15) and a third steam-salt heat exchanger (16) to release heat, low-temperature molten salt is boosted by a low-temperature molten salt pump (11) from a low-temperature molten salt tank (10) and then sequentially enters the third steam-salt heat exchanger (16) and the second steam-salt heat exchanger (15) in a countercurrent mode, and the high-temperature molten salt after heat absorption flows into a high-temperature molten salt tank (12) to be stored; part of steam at the outlet of the second steam-salt heat exchanger (15) can enter the low-pressure cylinder (2-3) through a pipeline to do work; steam at the outlet of the third steam-salt heat exchanger (16) is cooled by a steam-water heat exchanger (21) and then is mixed with condensed water at the outlet of a condensed water pump (5) to store low-grade heat in a water tank (22); and part of steam at the outlet of the third steam-salt heat exchanger (16) directly enters the deaerator (7).
8. The heat storage and release method of the double-medium heat storage type peak shaving thermal power generation system according to claim 6, wherein the high-grade heat release process is divided into two parts: the first part is high-temperature molten salt of the high-temperature molten salt tank (12) and flows through a fourth vapor-salt heat exchanger (17), a phase change heat exchanger (18) and a water-salt heat exchanger (19) in sequence after being boosted by a high-temperature molten salt pump (13), and low-temperature molten salt after releasing heat flows into the low-temperature molten salt tank (10); the feed water from the feed water pump (8) flows through a water-salt heat exchanger (19), a phase change heat exchanger (18) and a fourth steam-salt heat exchanger (17) in sequence to absorb heat to generate superheated steam, and the superheated steam is mixed with the superheated steam generated by the boiler superheater (1-1) and then sent to the inlet of a high-pressure cylinder (2-1) of the steam turbine; the second part is that the high-temperature molten salt of the high-temperature molten salt tank (12) flows into the fifth vapor salt heat exchanger (20) after being boosted by the high-temperature molten salt pump (13), then flows through the phase change heat exchanger (18) and the water salt heat exchanger (19) in sequence, and the low-temperature outlet end after releasing heat is connected to the intermediate pressure cylinder molten salt and flows into the low-temperature molten salt tank (10); the exhausted steam from the high-pressure cylinder (2-1) enters the intermediate-pressure cylinder (2-2) to do work after absorbing heat through the fifth steam-salt heat exchanger (20).
9. The heat storage and release method of the double-medium heat storage type peak shaving thermal power generation system according to claim 6, wherein the low-grade heat is released in two ways: the first mode is that hot water enters the deaerator (7) after being pressurized by the hot water pump (23) from the water tank (22); the second mode is that hot water in the water tank (22) is sent into the water-water heat exchanger (25) to release heat after being pressurized by the hot water supply pump (24), the heat is used for supplying heat, and the return water returns to the water tank (22).
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