CN117685806A - A large-scale thermal power flexible peak-shaving system using molten salt energy storage using latent heat of steam - Google Patents
A large-scale thermal power flexible peak-shaving system using molten salt energy storage using latent heat of steam Download PDFInfo
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- CN117685806A CN117685806A CN202310907593.9A CN202310907593A CN117685806A CN 117685806 A CN117685806 A CN 117685806A CN 202310907593 A CN202310907593 A CN 202310907593A CN 117685806 A CN117685806 A CN 117685806A
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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
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D15/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
- F01D15/10—Adaptations for driving, or combinations with, electric generators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K3/00—Plants characterised by the use of steam or heat accumulators, or intermediate steam heaters, therein
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B1/00—Methods of steam generation characterised by form of heating method
- F22B1/02—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers
- F22B1/06—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers the heat carrier being molten; Use of molten metal, e.g. zinc, as heat transfer medium
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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
- 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
- F28D20/0034—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00 using liquid heat storage material
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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
- F28D20/0034—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00 using liquid heat storage material
- F28D2020/0047—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00 using liquid heat storage material using molten salts or liquid metals
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Abstract
The invention discloses a fused salt energy storage large-scale thermal power flexible peak regulation system utilizing latent heat of steam, which comprises the following steps: the boiler, energy storage device is connected to the boiler, high device that adds, turbine high pressure cylinder and turbine intermediate pressure jar, energy release device connects the feed pump, high temperature molten salt jar and low temperature molten salt jar, the deaerator is connected to energy storage device, high temperature molten salt jar and low temperature molten salt jar, high device that adds connects the turbine high pressure cylinder, turbine intermediate pressure jar and feed pump, the deaerator is connected to the feed pump, deaerator intermediate pressure jar and low device that adds are connected to the deaerator, condensate pump is connected to low device that adds, the condenser is connected to the condensate pump, the turbine low pressure jar is connected to the condenser, the turbine low pressure jar is connected to the turbine intermediate pressure jar. The beneficial effects of the invention are as follows: can improve the heat exchange circulation efficiency and reduce the consumption of molten salt.
Description
Technical Field
The invention relates to the technical field of fused salt energy storage systems, in particular to a fused salt energy storage large-scale thermal power flexible peak regulation system utilizing latent heat of steam.
Background
At present, with the further increase of new energy and nuclear power installation, in order to ensure the power generation load of the new energy and the nuclear power, the number of power generation hours of the thermal power generating unit needs to be further reduced. Therefore, the peak regulation potential of the coal-fired unit needs to be excavated, the flexibility of the thermal power unit is improved, and the peak regulation and new energy consumption capabilities of the system are comprehensively improved.
In the prior art, energy is stored in a mode of electrically heating molten salt, the efficiency of the steam turbine for acting is limited by the steam Rankine cycle efficiency, and the efficiency is not more than 45%. The molten salt heating temperature is low, and a large amount of molten salt is needed to be used in the energy storage system. The heat release generates steam through high-temperature molten salt to externally supply industrial steam, the energy utilization rate is low, and the released energy does not return to the unit to participate in the peak. The method has the problems of low high heat exchange cycle efficiency and large molten salt consumption.
For example, a "novel energy storage cascade composite heat release system combining molten salt energy storage with solid energy storage" disclosed in chinese patent literature, its bulletin number: CN114607991a, filing date: 2022, 04 month and 12 days, the invention comprises a cold molten salt storage tank, a hot molten salt storage tank and solid energy storage equipment, wherein the cold molten salt storage tank is connected with a molten salt electric heater through a cold molten salt pump, the molten salt electric heater is connected with the hot molten salt storage tank, the hot molten salt storage tank is communicated with a molten salt inlet of an air molten salt heat exchanger through the hot molten salt pump, a molten salt outlet of the air molten salt heat exchanger is communicated with the cold molten salt storage tank, the solid energy storage equipment is communicated with an air inlet of an air molten salt heat exchanger, an air outlet of the air molten salt heat exchanger is communicated with an air inlet of an air steam heat exchanger, an air outlet of the air steam heat exchanger is communicated with an inlet of the air water heat exchanger, and the air outlet of the air water heat exchanger is communicated with an inlet of the solid energy storage equipment, so that the air steam heat exchanger can be used as an energy storage system of a photo-thermal power station, can also be used in occasions with requirements for energy storage, and has important application value in the technical field of photo-thermal power stations and other industrial fields, but the problems of low high heat exchange cycle efficiency and large molten salt consumption exist.
Disclosure of Invention
Aiming at the defects of low high heat exchange cycle efficiency and large molten salt consumption in the prior art, the invention provides a molten salt energy storage large-scale thermal power flexible peak regulation system utilizing latent heat of steam, which can improve the heat exchange cycle efficiency and reduce the molten salt consumption.
The following is a technical scheme of the invention, a fused salt energy storage large-scale thermal power flexible peak regulation system utilizing latent heat of steam, comprising: the boiler, energy storage device is connected to the boiler, high device that adds, turbine high pressure cylinder and turbine intermediate pressure jar, energy release device connects the feed pump, high temperature molten salt jar and low temperature molten salt jar, the deaerator is connected to energy storage device, high temperature molten salt jar and low temperature molten salt jar, high device that adds connects the turbine high pressure cylinder, turbine intermediate pressure jar and feed pump, the deaerator is connected to the feed pump, deaerator intermediate pressure jar and low device that adds are connected to the deaerator, condensate pump is connected to low device that adds, the condenser is connected to the condensate pump, the turbine low pressure jar is connected to the condenser, the turbine low pressure jar is connected to the turbine intermediate pressure jar.
In this scheme, through feedwater, steam and fused salt carry out the heat exchange, low temperature fused salt absorbs main steam heat from low temperature fused salt jar through energy memory and becomes high temperature fused salt, reentrant high temperature fused salt jar is interior to be stored. The high-temperature molten salt releases heat from the high-temperature molten salt tank through the energy release device to become low-temperature molten salt, and then the low-temperature molten salt enters the low-temperature molten salt tank for storage. The main steam releases heat to the water supply, so that sensible heat of the steam is stored, latent heat of the steam is also stored, and the energy utilization efficiency is improved; the main steam energy storage is extracted to heat the molten salt to a higher temperature, so that the smaller the molten salt consumption of the energy storage system is, and the cost is reduced.
Preferably, the turbine high pressure cylinder, the turbine intermediate pressure cylinder and the turbine low pressure cylinder are connected with a generator.
In the scheme, the generator is used for providing electric energy for the high-pressure cylinder of the steam turbine, the medium-pressure cylinder of the steam turbine and the low-pressure cylinder of the steam turbine, so that the steam turbine stably operates in the system, and a foundation is provided for heat exchange of water supply, steam and molten salt.
Preferably, in the high-pressure adding device, the first high-pressure adding device is connected with the boiler, the turbine high-pressure cylinder and the second high-pressure adding device, the second high-pressure adding device is connected with the boiler, the turbine high-pressure cylinder and the third high-pressure adding device, and the third high-pressure adding device is connected with the turbine medium-pressure cylinder and the water feeding pump.
In the scheme, the high-pressure heating device consists of a shell and a pipe system, when superheated steam enters the shell from an inlet, water supply in the upper main spiral pipe can be heated, after the steam is condensed into water, the condensed hot water can heat partial water supply in the lower cooling spiral pipe, and the utilized condensed water flows out of the body through a water drain outlet. The first high-pressure heater and the second high-pressure heater are both connected with the boiler and the high-pressure cylinder of the steam turbine, and the third high-pressure heater is connected with the medium-pressure cylinder of the steam turbine, so that the stability and the circulation efficiency of heat exchange can be improved.
Preferably, in the low-pressure adding device, the first low-pressure adding device is connected with a water feeding pump, a turbine low-pressure cylinder and a second low-pressure adding device, the second low-pressure adding device is connected with the turbine low-pressure cylinder and a third low-pressure adding device, the third low-pressure adding device is connected with the turbine low-pressure cylinder and a fourth low-pressure adding device, and the fourth low-pressure adding device is connected with the turbine low-pressure cylinder and a condensate pump.
In the scheme, the low-pressure steam turbine utilizes the steam which does partial work in the steam turbine to improve the temperature of water, reduces the steam quantity discharged into the condenser by the steam turbine, and is connected with the low-pressure cylinder of the steam turbine through the first low-pressure steam turbine, the second low-pressure steam turbine, the third low-pressure steam turbine and the fourth low-pressure steam turbine, so that the energy loss is reduced, and the circulation efficiency of a thermodynamic system is improved.
Preferably, in the energy storage device, the steam molten salt heat exchanger is connected with the high-temperature molten salt tank, the boiler and the condensing steam molten salt heat exchanger, and the condensing steam molten salt heat exchanger is connected with the low-temperature molten salt tank and the deaerator.
In this scheme, low temperature fused salt absorbs main steam heat and converts high temperature fused salt from low temperature fused salt jar through condensing type steam fused salt heat exchanger and steam fused salt heat exchanger respectively, stores in high temperature fused salt jar.
Preferably, in the energy release device, the preheater is connected with the water supply pump, the low-temperature molten salt tank and the steam generator, the steam generator is connected with the superheater, and the superheater is connected with the high-temperature molten salt tank.
In the scheme, the high-temperature molten salt is converted into the low-temperature molten salt from the high-temperature molten salt tank through heat released by the superheater, the steam generator and the preheater respectively and is stored in the low-temperature molten salt tank.
Preferably, the energy release device is a first heat exchanger, and the first heat exchanger is connected with the boiler, the water supply pump, the high-temperature salt melting tank and the low-temperature salt melting tank.
In the scheme, the high-temperature molten salt is converted into the low-temperature molten salt from the heat released by the high-temperature molten salt tank through the first heat exchanger and is stored in the low-temperature molten salt tank.
Preferably, the main steam releases heat to the superheated steam through the steam fused salt heat exchanger, sensible heat of the main steam is stored to fused salt, the superheated steam enters the condensing steam fused salt heat exchanger, the superheated steam releases heat to water and then is discharged into the deaerator, and the low-temperature fused salt is converted into high-temperature fused salt by absorbing heat of the main steam from the low-temperature fused salt tank through the condensing steam fused salt heat exchanger and the steam fused salt heat exchanger respectively and is stored in the high-temperature fused salt tank.
In the scheme, heat exchange between steam and molten salt in the energy storage process is realized, and an energy storage foundation is provided for the molten salt. The main steam releases heat to the water supply, so that not only the sensible heat of the steam is stored, but also the latent heat of the steam is stored, and the energy utilization efficiency is improved. And a condensing steam molten salt heat exchanger is configured, steam is condensed in the condensing steam molten salt heat exchanger, latent heat of the steam is released to molten salt, and the energy utilization efficiency is improved.
Preferably, the water supply of the deaerator is obtained, the water supply is heated by absorbing the heat of the fused salt through the preheater, the water supply is heated by absorbing the heat of the fused salt through the steam generator to generate saturated steam, the saturated steam is converged into a steam discharge pipeline of the medium-pressure cylinder of the steam turbine after absorbing the heat of the fused salt through the superheater, and then enters a low-pressure cylinder of the steam turbine to do work after being discharged by the medium-pressure cylinder of the steam turbine, and the high-temperature fused salt is converted into low-temperature fused salt from the high-temperature fused salt tank through the superheater, the steam generator and the preheater respectively, and is stored in the low-temperature fused salt tank.
According to the scheme, heat exchange between molten salt and water supply in the energy release process is realized, and saturated steam absorbs heat of the molten salt through the superheater and is converged into a steam discharge pipeline of the middle pressure cylinder of the steam turbine, and then the saturated steam and the steam discharge of the middle pressure cylinder of the steam turbine enter the low pressure cylinder of the steam turbine to do work, so that the energy utilization rate is improved.
Preferably, the water supply of the deaerator is obtained, the water supply is heated by the heat of the molten salt absorbed by the first heat exchanger and then enters the boiler, the heat released by the high-temperature molten salt from the high-temperature molten salt tank is converted into low-temperature molten salt through the first heat exchanger, and the low-temperature molten salt is stored in the low-temperature molten salt tank.
In the scheme, heat exchange between molten salt and water supply in the energy release process is realized, and the equipment requirement is reduced.
The beneficial effects of the invention are as follows:
1. the main steam releases heat to the water supply, so that sensible heat of the steam is stored, latent heat of the steam is also stored, and the energy utilization efficiency is improved;
2. a condensing steam molten salt heat exchanger is configured, steam is condensed in the condensing steam molten salt heat exchanger, latent heat of the steam is released to molten salt, and energy utilization efficiency is improved;
3. the main steam energy storage is extracted to heat the molten salt to a higher temperature, so that the smaller the molten salt consumption of the energy storage system is, and the cost is reduced.
Drawings
FIG. 1 is a schematic diagram of a fused salt energy storage large-scale thermal power flexible peak shaving system utilizing latent heat of steam.
Fig. 2 is an energy storage schematic diagram of a fused salt energy storage large-scale thermal power flexible peak shaving system utilizing latent heat of steam.
Fig. 3 is an energy release schematic diagram of a fused salt energy storage large-scale thermal power flexible peak regulation system utilizing latent heat of steam.
Fig. 4 is a heat exchange temperature diagram of an energy storage process of a fused salt energy storage large-scale thermal power flexible peak shaving system utilizing latent heat of steam.
FIG. 5 is a graph showing heat exchange temperature during the energy release process of a fused salt energy storage large-scale thermal power flexible peak shaving system utilizing latent heat of steam.
Fig. 6 is a second energy release schematic diagram of a fused salt energy storage large-scale thermal power flexible peak shaving system utilizing latent heat of steam.
FIG. 7 shows a schematic diagram of a fused salt energy storage large-scale thermal power flexible peak shaving system utilizing latent heat of steam.
In the figure, 1, a boiler, 2, a turbine high-pressure cylinder, 3, a turbine medium-pressure cylinder, 4, a turbine low-pressure cylinder, 5, a generator, 6, a deaerator, 7, a condenser, 8, a feed pump, 9, a condensate pump, 10, a first high-pressure adding device, 11, a second high-pressure adding device, 12, a third high-pressure adding device, 13, a first low-pressure adding device, 14, a second low-pressure adding device, 15, a third low-pressure adding device, 16, a fourth low-pressure adding device, 17, a high-temperature molten salt tank, 18, a low-temperature molten salt tank, 19, a steam molten salt heat exchanger, 20, a condensing steam molten salt heat exchanger, 21, a preheater, 22, a steam generator, 23, a superheater, 24, a high-pressure adding device, 25, a low-pressure adding device, 26, an energy releasing device, 27 and an energy storing device are shown; 28. a first heat exchanger.
Detailed Description
The technical scheme of the invention is further specifically described below through examples and with reference to the accompanying drawings.
Embodiment one:
as shown in fig. 1, 2 and 3, a fused salt energy storage large-scale thermal power flexible peak shaving system utilizing latent heat of steam includes: the boiler 1, energy storage device 27 is connected to boiler 1, high device 24, turbine high pressure cylinder 2 and turbine intermediate pressure jar 3, energy release device 26 connects feed pump 8, high temperature fused salt jar 17 and low temperature fused salt jar 18, energy storage device 27 connects the oxygen-eliminating device 6, high temperature fused salt jar 17 and low temperature fused salt jar 18, high device 24 connects turbine high pressure cylinder 2, turbine intermediate pressure jar 3 and feed pump 8, feed pump 8 connects oxygen-eliminating device 6, oxygen-eliminating device 6 connects turbine intermediate pressure jar 3 and low device 25, condensate pump 9 is connected to low device 25, condenser 7 is connected to condensate pump 9, turbine low pressure jar 4 is connected to condenser 7, turbine low pressure jar 4 is connected to turbine intermediate pressure jar 3, turbine high pressure jar 2, turbine intermediate pressure jar 3 and turbine low pressure jar 4 are connected to generator 5.
The high-pressure adding device 24 is configured with a plurality of high-pressure adding devices, in this embodiment, the high-pressure adding device 24 includes a first high-pressure adding device 10, a second high-pressure adding device 11 and a third high-pressure adding device 12, the first high-pressure adding device 10 is connected with the boiler 1, the turbine high-pressure cylinder 2 and the second high-pressure adding device 11, the second high-pressure adding device 11 is connected with the boiler 1, the turbine high-pressure cylinder 2 and the third high-pressure adding device 12, and the third high-pressure adding device 12 is connected with the turbine medium-pressure cylinder 3 and the water feeding pump 8. The first high-pressure heater 10, the second high-pressure heater 11 and the third high-pressure heater 12 consist of a shell and a pipe system, wherein a steam condensing section is arranged at the upper part of an inner cavity of the shell, a hydrophobic cooling section is arranged at the lower part of the inner cavity of the shell, and a water supply inlet and a water supply outlet are arranged at the top ends of a water inlet pipe and a water outlet pipe. When the superheated steam enters the shell from the inlet, the water supply in the upper main spiral tube can be heated, after the steam is condensed into water, the condensed hot water can heat part of the water supply in the lower cooling spiral tube, and the utilized condensed water flows out of the body through the water drain outlet.
The low adding device 25 is configured with a plurality of low adding devices, the low adding device 25 comprises a first low adding device 13, a second low adding device 14, a third low adding device 15 and a fourth low adding device 16, the first low adding device 13 is connected with the water feeding pump 8, the turbine low pressure cylinder 4 and the second low adding device 14, the second low adding device 14 is connected with the turbine low pressure cylinder 4 and the third low adding device 15, the third low adding device 15 is connected with the turbine low pressure cylinder 4 and the fourth low adding device 16, and the fourth low adding device 16 is connected with the turbine low pressure cylinder 4 and the condensate pump 9. The steam which performs partial work in the steam turbine is utilized to increase the temperature of water, so that the steam quantity discharged into the condenser 7 by the steam turbine is reduced, the energy loss is reduced, and the circulation efficiency of the thermodynamic system is improved.
The energy storage device 27 comprises a steam molten salt heat exchanger 19 and a condensing steam molten salt heat exchanger 20, the steam molten salt heat exchanger 19 is connected with the high-temperature molten salt tank 17, the boiler 1 and the condensing steam molten salt heat exchanger 20, and the condensing steam molten salt heat exchanger 20 is connected with the low-temperature molten salt tank 18 and the deaerator 6. When the unit depth peak shaving is performed, main steam passes through a steam fused salt heat exchanger 19, the main steam releases heat to superheated steam, and sensible heat of the main steam is stored to fused salt; then the slightly superheated steam enters a condensing type steam molten salt heat exchanger 20, and the slightly superheated steam releases heat to water supply and is discharged into a deaerator 6; the low-temperature molten salt is absorbed by the condensing steam molten salt heat exchanger 20 and the steam molten salt heat exchanger 19 from the low-temperature molten salt tank 18 respectively to become high-temperature molten salt, and then enters the high-temperature molten salt tank 17 for storage.
The energy release device 26 comprises a preheater 21, a steam generator 22 and a superheater 23, wherein the preheater 21 is connected with the feed water pump 8, the low-temperature molten salt tank 18 and the steam generator 22, the steam generator 22 is connected with the superheater 23, and the superheater 23 is connected with the high-temperature molten salt tank 17. When the unit peaks, a part of water at the outlet of the deaerator 6 is extracted, and the water is heated by absorbing the heat of molten salt through the preheater 21; then the heat of the fused salt is absorbed through a steam generator 22, and the saturated water is heated to generate saturated steam; finally, the heat of the fused salt is absorbed through the superheater 23, the steam temperature is further raised, and the generated superheated steam is converged into a steam exhaust pipeline of the steam turbine intermediate pressure cylinder 3 and then enters the steam turbine low pressure cylinder 4 together with the steam exhaust of the steam turbine intermediate pressure cylinder 3 to apply work. The flow rate and time of steam generation can be adjusted by adjusting the size of the heat exchanger. The high-temperature molten salt releases heat from the high-temperature molten salt tank 17 through the superheater 23, the steam generator 22 and the preheater 21 respectively, becomes low-temperature molten salt, and then enters the low-temperature molten salt tank 18 for storage.
The main steam releases heat to the water supply, so that not only the sensible heat of the steam is stored, but also the latent heat of the steam is stored, and the energy utilization efficiency is improved. The condensing steam molten salt heat exchanger 20 is configured, the steam is arranged on the shell side, the molten salt is arranged on the tube side, the steam is condensed in the condensing steam molten salt heat exchanger 20, and latent heat of the steam is released to the molten salt. The main steam energy storage is extracted to heat the molten salt to a higher temperature, so that the smaller the molten salt consumption of the energy storage system is, and the cost is reduced.
Embodiment two:
in combination with the first embodiment, the embodiment takes a typical thermodynamic system of a 60-kilomega-thousand thermal power generating unit as an example, and describes the energy storage and energy release process of the flexible peak shaving system.
As shown in fig. 2, the energy storage process during deep peak shaving is as follows: when the unit depth peak regulation is carried out, the boiler 1 is maintained to operate at 25% of the lowest steady burning load, the steam turbine is maintained to operate at 15% of the lowest steady running load, main steam is extracted for about 150t/h, and the main steam releases heat until water is supplied to heat molten salt. First, the main steam passes through a steam fused salt heat exchanger 19, the main steam (9 MPa,566 ℃) releases heat to superheated steam (9 MPa,305 ℃), sensible heat of the main steam is stored into fused salt, and the fused salt is heated from 290 ℃ to 350 ℃. Then the slightly superheated steam enters a condensing type steam fused salt heat exchanger 20, the slightly superheated steam (9 MPa,305 ℃) releases heat to water (9 MPa,200 ℃) and is discharged into a deaerator 6, and the fused salt is heated to 290 ℃ from 190 ℃. The low-temperature molten salt is absorbed by the condensing steam molten salt heat exchanger 20 and the steam molten salt heat exchanger 19 from the low-temperature molten salt tank 18 respectively to become high-temperature molten salt, and then enters the high-temperature molten salt tank 17 for storage. The heat exchange temperature curve in the energy storage process is shown in fig. 4, wherein A is a steam heat release curve, and B is a fused salt heat absorption curve. The heat exchange efficiency is higher as can be seen from the heat exchange temperature curve.
As shown in fig. 3, the peak energy release process is: when the unit is in the peak, water is added into the high-temperature molten salt, the water is heated to superheated steam and then is sent into the low-pressure cylinder 4 of the turbine of the unit to do work, and the output of the unit is increased. Firstly, a part of the feed water at the outlet of the deaerator 6 is extracted, and passes through the preheater 21 to absorb the heat of the molten salt, so that the feed water is heated. And then passes through a steam generator 22 to absorb the heat of the molten salt and heat the saturated water to generate saturated steam. Finally, the heat of the fused salt is absorbed through the superheater 23, the steam temperature is further increased, superheated steam (1 MPa,350 ℃) is generated, and the superheated steam is converged into a steam exhaust pipeline of the middle pressure cylinder 3 of the steam turbine and then enters the low pressure cylinder 4 of the steam turbine together with the steam exhaust of the middle pressure cylinder 3 of the steam turbine to apply work. The flow rate and time of steam generation can be adjusted by adjusting the size of the heat exchanger. The high-temperature molten salt releases heat from the high-temperature molten salt tank 17 through the superheater 23, the steam generator 22 and the preheater 21 respectively, becomes low-temperature molten salt, and then enters the low-temperature molten salt tank 18 for storage. The heat exchange temperature curve in the energy release process is shown in fig. 5, C is the water supply heat absorption curve, and D is the molten salt heat release curve. The heat exchange efficiency is higher as can be seen from the heat exchange temperature curve.
Embodiment III:
in combination with the first or second embodiment, the present embodiment provides the second energy release device 26 and describes the energy release process.
As shown in fig. 6, the energy release device 26 is a first heat exchanger 28, and the first heat exchanger 28 is connected with the boiler 1, the feed water pump 8, the high-temperature molten salt tank 17 and the low-temperature molten salt tank 18. When releasing energy, the steam generated by the energy release device enters the low-pressure cylinder 4 of the steam turbine to do work, and the water supply can be heated, so that the steam extraction from the high-pressure cylinder to the first high-pressure cylinder 10, the second high-pressure cylinder 11 and the third high-pressure cylinder 12 of the steam turbine is reduced, and the output of the unit is improved.
The energy release process at the peak of the scheme is as follows: at the peak of the unit, water is added through high-temperature molten salt, and the water temperature is increased to the temperature of the outlet of the first high-temperature molten salt 10 and then enters the boiler 1. Firstly, a part of the feed water at the outlet of the deaerator 6 is extracted, the heat of the molten salt is absorbed by the first heat exchanger 28, the feed water is heated, and the temperature of the feed water is raised, and then the feed water enters the boiler 1. The high-temperature molten salt releases heat from the high-temperature molten salt tank 17 through the first heat exchanger 28 respectively, becomes low-temperature molten salt, and enters the low-temperature molten salt tank 18 for storage.
The main steam in the energy storage process releases heat to the water supply, so that sensible heat of the steam is stored, and latent heat of the steam is also stored. Compared with the prior art, the energy storage process steam is subjected to power generation through the steam turbine after acting, and then is subjected to electric heating molten salt, and the energy utilization efficiency is not more than 45% because the energy storage process steam is limited by the steam Rankine cycle efficiency. The scheme stores the latent heat of steam, and the energy utilization efficiency is more than or equal to 90%. This scheme stores the latent heat of steam and has set up condensing steam fused salt heat exchanger 20, and the shell side is walked to the steam, and the pipe side is walked to the fused salt. The steam may be condensed within the condensing steam molten salt heat exchanger 20 releasing the latent heat of the steam to the molten salt. Considering that the pressure of main steam is high, the saturation temperature corresponding to steam is high, the scheme selects to extract main steam energy storage, and molten salt can be heated to a higher temperature. The larger the temperature rising amplitude of the molten salt is, the smaller the molten salt consumption of the energy storage system is, and the lower the system cost is.
Embodiment four:
the energy storage and release scheme is constructed on the basis of a typical thermodynamic system of a 60-kilowatt thermal power generating unit by utilizing Ebsilon software, and the efficiency of a computing system is simulated. In the second embodiment and the third embodiment, energy is released under different loads of the unit, the output of the increased unit is different, and the specific increased output is shown in fig. 7. When the unit operates in the working condition of more than 70% THA, the third embodiment can increase the output of more units; when the unit operates under the working condition of less than 40% THA, the fourth embodiment can increase the output of more units. This is because the heating water supply scheme can replace more high pressure heater steam inlet when the unit is operated under high load, and the part of steam can do more work in the high and medium pressure cylinders of the steam turbine. The Ebsilon software can be used for calculating a system with 100% THA working condition energy release collocation of the machine set in the first embodiment and the third embodiment, the efficiency of the whole system is highest, and the efficiency of the energy storage system is 70%.
It should be noted that, in the above embodiments, as long as the technical solutions that are not contradictory can be arranged and combined, those skilled in the art can exhaust all the possibilities according to the mathematical knowledge of the arrangement and combination, so the present invention does not describe the technical solutions after the arrangement and combination one by one, but should be understood that the technical solutions after the arrangement and combination have been disclosed by the present invention.
The present embodiment is only exemplary of the present patent, and does not limit the scope of protection thereof, and those skilled in the art may also change the part thereof, so long as the spirit of the present patent is not exceeded, and the present patent is within the scope of protection thereof.
Claims (10)
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118582996A (en) * | 2024-05-31 | 2024-09-03 | 西安交通大学 | A water vapor energy storage system coupled with a thermal power plant and an operation method thereof |
| CN118640727A (en) * | 2024-07-04 | 2024-09-13 | 西安热工研究院有限公司 | A coal-fired unit coupled with a cascade heat storage system and an operation method thereof |
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2023
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118582996A (en) * | 2024-05-31 | 2024-09-03 | 西安交通大学 | A water vapor energy storage system coupled with a thermal power plant and an operation method thereof |
| CN118582996B (en) * | 2024-05-31 | 2025-09-23 | 西安交通大学 | A water vapor energy storage system coupled with a thermal power plant and an operation method thereof |
| CN118640727A (en) * | 2024-07-04 | 2024-09-13 | 西安热工研究院有限公司 | A coal-fired unit coupled with a cascade heat storage system and an operation method thereof |
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