CN116576441A - Energy storage system and tower type solar thermal power generation system - Google Patents
Energy storage system and tower type solar thermal power generation system Download PDFInfo
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- CN116576441A CN116576441A CN202310272709.6A CN202310272709A CN116576441A CN 116576441 A CN116576441 A CN 116576441A CN 202310272709 A CN202310272709 A CN 202310272709A CN 116576441 A CN116576441 A CN 116576441A
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- 238000004146 energy storage Methods 0.000 title claims abstract description 65
- 238000010248 power generation Methods 0.000 title claims abstract description 16
- 238000005338 heat storage Methods 0.000 claims abstract description 136
- 238000005485 electric heating Methods 0.000 claims abstract description 55
- 239000007787 solid Substances 0.000 claims description 15
- 230000005611 electricity Effects 0.000 claims description 12
- 239000006096 absorbing agent Substances 0.000 claims description 9
- 230000005484 gravity Effects 0.000 claims description 8
- 238000010438 heat treatment Methods 0.000 claims description 8
- 230000001105 regulatory effect Effects 0.000 claims description 5
- 238000011084 recovery Methods 0.000 claims description 4
- 238000004891 communication Methods 0.000 claims description 3
- 150000003839 salts Chemical class 0.000 description 92
- 238000002844 melting Methods 0.000 description 14
- 230000008018 melting Effects 0.000 description 14
- 239000007788 liquid Substances 0.000 description 10
- 238000010521 absorption reaction Methods 0.000 description 4
- 238000012423 maintenance Methods 0.000 description 3
- 239000002699 waste material Substances 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 238000009835 boiling Methods 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 230000001172 regenerating effect Effects 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
- 239000002918 waste heat Substances 0.000 description 1
Classifications
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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
- 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
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B33/00—Steam-generation plants, e.g. comprising steam boilers of different types in mutual association
- F22B33/18—Combinations of steam boilers with other apparatus
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- 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
-
- 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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/14—Thermal energy storage
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Engine Equipment That Uses Special Cycles (AREA)
Abstract
The invention discloses an energy storage system and a tower type solar thermal power generation system, wherein an electric heating device is arranged to receive and heat storage media in a hot storage tank and/or a cold storage tank, the heated heat storage media can be output to a heat storage medium with preset temperature after being mixed with the heat storage media output by the hot storage tank through an output pipeline of the energy storage system, and then the heat storage media are output to an external heat utilization system or directly output to the external heat utilization system for emergency starting, so that the temperature stability of the heat storage media output by the energy storage system is improved; the electric heating device receives the heat storage medium in the hot storage tank and/or the cold storage tank, heats and outputs the heat storage medium to the hot storage tank and/or the cold storage tank, so that the temperature of the heat storage medium in the hot storage tank and/or the cold storage tank is adjusted, the stability of the temperature of the heat storage medium in the cold storage tank and/or the hot storage tank is further improved, and the stability and the safety of the energy storage system are further improved.
Description
Technical Field
The invention belongs to the technical field of energy storage, and particularly relates to an energy storage system and a tower type solar thermal power generation system.
Background
In a general operation flow of a photo-thermal power station, the temperature of a heat storage medium in a heat storage tank is usually lower when the power station is started for the first time, after the power station is stopped for maintenance or in continuous overcast and rainy weather. The mode of heating the heat storage medium through traditional electric tracing or using the natural gas heating furnace often has slower speed, and still has waste gas waste heat emission's such as carbon dioxide problem, and the heat storage medium of lower temperature often can cause heat exchange efficiency low after getting into Steam Generation System (SGS), and the steam temperature or the pressure of output are not enough scheduling problem, and then influence the power station generated energy.
Disclosure of Invention
The invention aims to solve the technical problems of low heating speed of a heat storage medium and influence on the power generation capacity of a power station in the traditional schemes such as electric tracing and the like by providing an energy storage system and a tower type solar thermal power generation system.
In order to solve the problems, the technical scheme of the invention is as follows:
an energy storage system of the present invention includes:
the output end of the heat storage tank is communicated with an external heat utilization system through an energy storage system output pipeline;
the input end of the cold storage tank is communicated with an external heat utilization system through an energy storage system recovery pipeline;
the input end of the electric heating device is communicated with the output end of the hot storage tank and/or the cold storage tank through a heat storage medium input pipeline; the output end of the electric heating device is communicated with at least one of the input end of the hot storage tank, the input end of the cold storage tank and the output pipeline of the energy storage system through a heat storage medium output pipeline;
the output pump is arranged on the heat storage medium output pipeline or between the heat storage medium output pipeline and the output end of the electric heating device.
The output end of the heat storage medium output pipeline comprises a first output branch and a second output branch; the first output branch is communicated with the input end of the hot storage tank; the second output branch is communicated with the input end of the cold storage tank;
the input end of the heat storage medium input pipeline comprises a first input branch and a second input branch; the first input branch is communicated with the output end of the hot storage tank; the second input branch is communicated with the output end of the cold storage tank;
the first output branch, the second output branch, the first input branch and the second input branch are respectively and correspondingly provided with a first output valve, a second output valve, a first input valve and a second input valve.
The energy storage system also comprises a thermal low-level tank, a thermal low-level tank input pipe, a thermal low-level tank output pipe and a high-temperature pump;
the heat storage medium in the heat storage tank can fully or partially enter the heat low-level tank by means of self gravity;
the input end of the heat low-level tank input pipe is communicated with the output end of the heat storage tank and/or the heat storage medium output pipeline; the output end of the input pipe of the thermal low-level tank is communicated with the input end of the thermal low-level tank;
the input end of the output pipe of the thermal low-level tank is communicated with the output end of the thermal low-level tank; the output end of the output pipe of the thermal low-level tank comprises a third output branch and/or a fourth output branch, the third output branch is communicated with an external thermal system, and the fourth output branch is communicated with the heat storage medium input pipeline;
the high-temperature pump is arranged on the output pipe of the thermal low-level tank or between the output pipe of the thermal low-level tank and the output end of the thermal low-level tank;
and the first switch valve, the second switch valve and the third switch valve are respectively and correspondingly arranged on the input pipe, the third output branch and the fourth output branch of the thermal low-level tank.
According to the energy storage system disclosed by the invention, the volume of the thermal low-level tank is smaller than that of the thermal storage tank, and the height of the thermal low-level tank is smaller than that of the thermal storage tank.
The energy storage system also comprises a cold low-level tank, a cold low-level tank input pipe, a cold low-level tank output pipe and a low-temperature pump;
the cold low-level tank is arranged at a low level relative to the cold storage tank, and the heat storage medium in the cold storage tank can fully or partially enter the cold low-level tank by means of self gravity;
the input end of the cold low-level tank input pipe is communicated with the output end of the cold storage tank and/or the heat storage medium output pipeline; the output end of the cold low-level tank input pipe is communicated with the input end of the cold low-level tank;
the input end of the output pipe of the cold low-level tank is communicated with the output end of the cold low-level tank; the output end of the cold low-level tank output pipe comprises a fifth output branch and/or a sixth output branch, the fifth output branch is communicated with the input end of the external heat absorber, and the sixth output branch is communicated with the heat storage medium input pipeline;
the low-temperature pump is arranged on the cold low-level tank output pipe or between the cold low-level tank output pipe and the output end of the cold low-level tank;
and the cold low-level tank input pipe, the fifth output branch and the sixth output branch are respectively and correspondingly provided with a fourth switch valve, a fifth switch valve and a sixth switch valve.
According to the energy storage system disclosed by the invention, the volume of the cold low-level tank is smaller than that of the cold storage tank, and the height of the cold low-level tank is smaller than that of the cold storage tank.
The output end of the heat storage medium output pipeline also comprises a seventh output branch, and the output end of the seventh output branch is communicated with the input end of the external heat utilization system;
and the seventh output branch is provided with a temperature regulating valve.
The external heat utilization system of the energy storage system is an SGS system.
The energy storage system of the invention also comprises a connecting pipe and a circulating valve;
the first end of the connecting pipe is communicated with the output end of the electric heating device or the heat storage medium output pipeline, and the second end of the connecting pipe is communicated with the input end of the electric heating device or the heat storage medium input pipeline;
the circulating valve is arranged on the connecting pipe or between the output end of the electric heating device and the connecting pipe.
The electric heating device comprises a solid heat storage medium feeding part;
the output end of the solid heat storage medium feeding part is matched with the feeding port of the electric heating device.
According to the energy storage system, the electric power source of the electric heating device is at least one of photovoltaic electricity, wind power and grid valley electricity.
The invention relates to a tower type solar thermal power generation system, which comprises: a heat absorber, an SGS system, a steam turbine, a generator, and an energy storage system as described in any of the foregoing;
the output end of the cold storage tank is communicated with the input end of the heat absorber through a pipeline;
the output end of the heat absorber is communicated with the input end of the hot storage tank through a pipeline;
the heat storage medium input end of the SGS system is communicated with the output end of the hot storage tank and/or the output end of the electric heating device through a pipeline, the heat storage medium output end of the SGS system is communicated with the input end of the cold storage tank, and the SGS system receives the heat storage medium and outputs high-temperature and high-pressure steam to drive the steam turbine to drive the generator to generate electricity.
By adopting the technical scheme, the invention has the following advantages and positive effects compared with the prior art:
1. according to the embodiment of the invention, the electric heating device is arranged to receive and heat the heat storage medium in the hot storage tank and/or the cold storage tank, and the heated heat storage medium can be output to the heat storage medium with the preset temperature after being mixed with the heat storage medium output by the hot storage tank through the output pipeline of the energy storage system, and then is output to the external heat utilization system or is directly output to the external heat utilization system for emergency starting, so that the temperature stability of the heat storage medium output by the energy storage system is improved; the electric heating device receives the heat storage medium in the hot storage tank and/or the cold storage tank, heats and outputs the heat storage medium to the hot storage tank and/or the cold storage tank, so that the temperature of the heat storage medium in the hot storage tank and/or the cold storage tank is adjusted, the stability of the temperature of the heat storage medium in the cold storage tank and/or the hot storage tank is further improved, and the stability and the safety of the energy storage system are further improved.
2. According to the embodiment of the invention, the low-level tanks are respectively arranged at the hot storage tank and/or the cold storage tank, and the short-axis molten salt pump is used for driving molten salt to flow, so that the use of an expensive long-axis pump is avoided, and the construction cost and the operation and maintenance cost of the energy storage system are reduced.
3. According to the embodiment of the invention, the electric heater is used for replacing the heat absorption system at night or partially replacing the heat absorption system at daytime, so that the continuity of system operation is improved, and the frequent start-stop impact on an external heat utilization system is reduced.
4. According to the embodiment of the invention, the photovoltaic electricity, wind power or grid valley electricity is utilized to heat the heat storage medium and output to an external heat utilization system for utilization in other electricity consumption heat utilization peak time periods, so that peak shaving is effectively eliminated, and the energy utilization efficiency, the grid stability and the schedulability are improved.
Drawings
Fig. 1 is a schematic diagram of an energy storage system of the present invention.
Reference numerals illustrate: 1: a power distribution cabinet; 2: a feed port; 3: a conveyor belt; 4: a feed inlet; 5: a stirrer; 6: a heat exchange container; 7: a filter screen; 8: an electric heater; 9: an electric tracing device; 10: an output pump; 11: a circulation valve; 12: a first output valve; 13: a second output valve; 14: a temperature regulating valve; 15: a hot storage tank; 16: a cold storage tank; 17: a first input valve; 18: a second input valve; 19: a first switching valve; 20: a fourth switching valve; 21: a thermal low tank; 22: a cold low tank; 23: a high temperature pump; 24: a cryogenic pump; 25: a third switching valve; 26: a sixth switching valve; 27: a second switching valve; 28: and a fifth switching valve.
Detailed Description
The energy storage system and the tower type solar thermal power generation system provided by the invention are further described in detail below with reference to the accompanying drawings and specific embodiments. Advantages and features of the invention will become more apparent from the following description and from the claims.
Example 1
Referring to FIG. 1, in one embodiment, an energy storage system includes a hot storage tank 15, a cold storage tank 16, an electrical heating device, and an output pump 10.
The output end of the heat storage tank 15 is communicated to an external heat utilization system through an energy storage system output pipeline. The input of the cold storage tank 16 is connected to an external heat using system via an energy storage system recovery line.
The input end of the electric heating device is communicated with the output end of the hot storage tank 15 and/or the cold storage tank 16 through a heat storage medium input pipeline. The output end of the electric heating device is communicated to at least one of the input end of the hot storage tank 15, the input end of the cold storage tank 16 and the output pipeline of the energy storage system through a heat storage medium output pipeline. In this embodiment, the output end of the electric heating device is respectively connected to the input end of the hot storage tank 15, the input end of the cold storage tank 16 and the output pipeline of the energy storage system through the output pipeline of the heat storage medium.
The output pump 10 is arranged on the heat storage medium output pipeline or between the heat storage medium output pipeline and the output end of the electric heating device.
In the running state, the electric heating device receives the heat storage medium in the cold storage tank 16 and/or the hot storage tank 15 through the heat storage medium input pipeline and drives the heat storage medium to flow under the action of the output pump 10, the electric heating device heats the flowing heat storage medium, and the heated heat storage medium is output to the hot storage tank 15, the cold storage tank 16 or the energy storage system output pipeline through the heat storage medium output pipeline according to actual running requirements.
According to the embodiment, the electric heating device is arranged to receive and heat the heat storage medium in the hot storage tank 15 and/or the cold storage tank 16, the heated heat storage medium can be output to the heat storage medium with the preset temperature after being mixed with the heat storage medium output by the hot storage tank 15 through the output pipeline of the energy storage system, and then the heat storage medium is output to the external heat utilization system or directly output to the external heat utilization system for emergency starting, so that the temperature stability of the heat storage medium output by the energy storage system is improved; the electric heating device receives the heat storage medium in the hot storage tank 15 and/or the cold storage tank 16, heats and outputs the heat storage medium to the hot storage tank 15 and/or the cold storage tank 16, so that the temperature of the heat storage medium in the hot storage tank 15 and/or the cold storage tank 16 is regulated, the stability of the temperature of the heat storage medium in the cold storage tank 16 and/or the hot storage tank 15 is further improved, and the stability and the safety of an energy storage system are further improved.
The specific structure of the energy storage system of this embodiment is further described below by taking a heat storage medium as a molten salt as an example:
in this embodiment, the energy storage system may further comprise a connection pipe and a circulation valve 11. The first end of the connecting pipe is communicated with the output end of the electric heating device or the heat storage medium output pipeline, and the second end of the connecting pipe is communicated with the input end of the electric heating device or the heat storage medium input pipeline. The circulation valve 11 is arranged on the connecting pipe or between the output end of the electric heating device and the connecting pipe, and the circulation valve 11 is used for controlling the on-off or flow of the connecting pipe. The heat storage medium output by the electric heating device is circulated back to the electric heating device by the connecting pipe, and when in a salt melting stage (heating and melting solid molten salt into liquid molten salt), the characteristic of good liquidity of the liquid molten salt can be utilized, and the heat of the liquid molten salt is utilized to accelerate the melting of the solid molten salt, so that the salt melting speed is accelerated and the uniformity of the molten salt temperature is improved.
The connecting pipe can be specifically arranged to be connected to the heat storage medium output pipeline and the heat storage medium input pipeline, and the input end of the heat storage medium output pipeline is positioned at the upstream of the circulating valve, so that the opening and closing of the circulating valve can control whether the molten salt flows further in the connecting pipe or is output to the heat storage medium output pipeline; the output end of the heat storage medium input pipeline is positioned at the downstream of the circulating valve, so that the opening and closing of the circulating valve can not influence molten salt in the heat storage system to enter the electric heating device.
The heat storage system described above in the present embodiment may specifically include a hot storage tank 15 and a cold storage tank 16.
The output end of the heat storage medium output pipeline comprises a first output branch and a second output branch. The first output branch communicates with the input of the hot tank 15 and the second output branch communicates with the input of the cold tank 16. The second output branch may be directly connected to an energy storage system recovery line of the SGS system (steam generation system) in communication with the cold storage tank 16.
The input end of the heat storage medium input pipeline comprises a first input branch and a second input branch. The first input branch communicates with the output of the hot tank 15. The second input branch communicates with the output of the hot tank 15.
Wherein the first output branch, the second output branch, the first input branch and the second input branch are respectively provided with a first output valve 12, a second output valve 13, a first input valve 17 and a second input valve 18.
Further, the heat storage system further comprises a hot low tank 21, a hot low tank input pipe, a hot low tank output pipe and a high temperature pump 23. Wherein, the low level setting of hot low level jar 21 relative to hot storage tank 15 for the fused salt in the hot storage tank 15 can utilize self gravity inflow hot low level jar 21, need not external force drive, and, in this embodiment, the volume of hot low level jar 21 is less than hot storage tank 15, and the high-temperature pump 23 that sets up on hot low level jar 21 like this can adopt the minor axis pump, reduce cost, simultaneously, because the volume of hot low level jar 21 is less, so can reduce the volume of the unusable fused salt that leads to because of the minimum liquid level requirement restriction of high-temperature pump 23, and then improve the utilization ratio of fused salt.
The input of the hot low tank input pipe communicates with the output of the hot storage tank 15 and/or with the first input branch, in this embodiment the output of the hot storage tank 15 is arranged at the tank wall or the tank bottom of the hot storage tank 15. When the output end of the heat storage tank 15 is arranged on the tank wall of the heat storage tank 15, on the premise of meeting the tank body safety requirement and other technical requirements of the heat storage tank 15, the output end of the heat storage tank 15 is arranged at a position as close to the tank bottom as possible, so that more molten salt can flow into the heat low-level tank 21 from the heat storage tank 15 by means of self gravity. The output end of the input pipe of the thermal low-level tank is communicated with the input end of the thermal low-level tank 21. The input end of the output pipe of the thermal low-level tank is communicated with the output end of the thermal low-level tank 21. The output end of the output pipe of the thermal low-level tank comprises a third output branch and/or a fourth output branch, the third output branch is communicated with the input end of the SGS system, and the fourth output branch is communicated with the heat storage medium input pipeline.
Wherein, the input pipe, the third output branch and the fourth output branch of the thermal low-level tank 21 are respectively provided with a first switch valve 19, a second switch valve 27 and a third switch valve 25 correspondingly.
Further, the heat storage system also includes a cold low tank 22, a cold low tank input pipe, a cold low tank output pipe, and a cryopump 24. The cold low tank 22 is arranged at a low position relative to the cold storage tank 16, so that molten salt in the cold storage tank 16 can flow into the cold low tank 22 by utilizing self gravity without being driven by external force. In addition, in the embodiment, the volume of the cold low tank 22 is smaller than that of the cold storage tank 16, and the height of the cold low tank 22 is smaller than that of the cold storage tank 16, so that the low-temperature pump 24 arranged on the cold low tank 22 can adopt a short-axis pump, the cost is reduced, and meanwhile, the volume of the cold low tank 22 is smaller, so that the amount of unusable molten salt caused by the limitation of the minimum liquid level requirement of the low-temperature pump 24 can be reduced, and the utilization rate of the molten salt is further improved.
The input of the cold low tank input pipe communicates with the output of the cold storage tank 16 and/or with the second input branch, in this embodiment the output of the cold storage tank 16 is arranged at the tank wall or the tank bottom of the cold storage tank 16. When the output end of the cold storage tank 16 is disposed on the tank wall of the cold storage tank 16, on the premise of meeting the tank safety requirement and other technical requirements of the cold storage tank 16, the output end of the cold storage tank 16 is disposed as close to the tank bottom as possible, so that more molten salt can flow from the cold storage tank 16 into the cold low tank 22 by virtue of gravity thereof. The output of the cold low tank 22 input pipe communicates with the cold low tank 22 input. The input end of the output pipe of the cold low-level tank 22 is communicated with the output end of the cold low-level tank 22. The output end of the output pipe of the cold low-level tank 22 comprises a fifth output branch and/or a sixth output branch, wherein the fifth output branch is communicated with the input end of the heat absorber, and the sixth output branch is communicated with the heat storage medium input pipeline.
The fourth switching valve 20, the fifth switching valve 28 and the sixth switching valve 26 are respectively arranged on the input pipe, the fifth output branch and the sixth output branch of the cold low tank 22.
Specifically, the fourth output branch and the sixth output branch may be summarized and then communicated to the heat storage medium input pipeline.
In this embodiment, the output end of the heat storage medium output pipeline further includes a seventh output branch, and the output end of the seventh output branch is connected to the output pipeline of the energy storage system or the input end of the SGS system, where the seventh output branch is provided with a temperature adjusting valve 14, so that molten salt heated by the electric heating device can be directly output to the SGS system.
In this embodiment, the external heat utilization system may be an SGS system, which is a steam generation system, specifically may be a heat exchange system for realizing heat exchange between the heat storage medium and the hydraulic medium, and outputs high-temperature and high-pressure steam.
In the present embodiment, the electric heating device may be a heat exchange container 6 provided with an electric heater 8, and the heat exchange container 6 may be a salt-thinning tank or a salt-dissolving tank. The electric heater 8 and the heat exchange container 6 can adopt a split design, and at the moment, the initial low-temperature molten salt in the heat exchange container 6 needs to be pumped into the electric heater 8 by using the output pump 10 positioned at the outlet of the heat exchange container 6, and the heated molten salt is then pumped back to the inlet of the heat exchange container 6 for circularly heating the molten salt and/or pumped into other hot salt demand equipment and a storage tank.
The electric heater 8 and the heat exchange container 6 thereof can also adopt an integrated combined design, at the moment, along with the continuous pumping out of molten salt at the outlet of the heat exchange container 6 by the output pump 10, the low-temperature molten salt at the inlet flows towards the outlet under the driving of liquid level difference, flows through the electric heater 8 positioned in the middle of the heat exchange container 6 and is heated into high-temperature molten salt, and then the high-temperature molten salt is pumped out to the inlet of the heat exchange container 6 by the output pump 10 to circularly heat the molten salt and/or pumped into other hot salt demand equipment and storage tanks.
When the heat exchange container 6 is a salt melting tank, the energy storage system may further include a solid heat storage medium feeding portion. The salt melting tank is provided with a feed inlet 4, a filter screen 7 and a stirrer 5 are arranged in the salt melting tank, and the salt melting tank is provided with an electric tracing device 9. The output end of the solid heat storage medium feeding part is matched with the feeding port 2. The solid-state heat storage medium feeding part can comprise a feeding port 2 and a conveying belt 3, and the solid molten salt is discharged from a feeding port 4 into the salt melting tank through the feeding port 2 and the conveying belt 3. It should be noted that the feed inlet 4 is an inlet for solid molten salt into the electric heating device, and the input end of the electric heating device is an inlet for liquid molten salt into the electric heating device.
The existing new energy photovoltaic, wind power and other power generation modes are unstable, and when the light resource or wind resource is good, waste light and waste wind are often formed to meet the power generation capacity or power grid dispatching requirements, so that substantial electric quantity waste is caused. Therefore, in this embodiment, the power supply end of the electric heating device may be photovoltaic power, wind power or grid valley power, and the power distribution cabinet 1 is electrically connected between the electric heater 8 and the power supply end.
Example two
The embodiment provides a tower type solar thermal power generation system, which comprises a heat absorber, an SGS system and the energy storage system in the first embodiment.
Wherein the output of the cold storage tank 16 is in communication with the input of the heat sink via a pipeline. The heat storage medium input end of the SGS system is communicated with the output end of the hot storage tank 15 and the output end of the electric heating device through pipelines, the heat storage medium output end of the SGS system is communicated with the input end of the cold storage tank 16, and the SGS system receives heat exchange between the heat storage medium and the hydraulic medium and outputs high-temperature and high-pressure steam to drive the steam turbine to drive the generator to generate electricity. The electric heating device in the energy storage system is arranged, so that the electric heating device heats the heat storage medium flowing into the hot storage tank 15/the cold storage tank 16 or the heat storage medium in the electric heating device through photovoltaic electricity, wind electricity, grid valley electricity and other low-cost electric energy. The heated heat storage medium can be conveyed back into the electric heating device to heat the unmelted solid heat storage medium. Or directly conveyed to an output pipeline of the energy storage system through a heat storage medium output pipeline, and output and power generation can be performed after the heat storage medium is mixed with the heat storage medium in the heat storage tank 15 to form the heat storage medium with the preset temperature. The quick and efficient high-energy quality starting of the photo-thermal energy storage power station can be realized, the generated energy and the overall operation efficiency of the photo-thermal power station can be improved, and the problem of low power generation efficiency of the existing photo-thermal energy storage power station is solved.
Some specific application examples of the tower solar thermal power generation system of the present embodiment are described below:
1. an electric heating device is configured in the energy storage system, low-price electric power such as photovoltaic power, wind power, grid valley power and the like is utilized to drive the electric heating device to heat relatively low-temperature molten salt which is conveyed from a thermal low-level tank 21 to the electric heating device by a high-temperature pump 23 or discharged from a thermal storage tank 15 to the electric heating device through a first input valve 17, the heated molten salt is conveyed to an outlet of the high-temperature pump 23 by an output pump 10 through a temperature regulating valve 14, and the heated molten salt is mixed with the initial relatively low-temperature molten salt which is conveyed by the high-temperature pump 23 from the thermal low-level tank 21 and the thermal storage tank 15 to form a preset high-temperature molten salt, and then enters a molten salt steam generation system to exchange heat to generate steam, so that quick and efficient and high-energy quality starting of the photo-thermal energy storage power station is realized, and the generated energy and the integral operation efficiency are improved.
Meanwhile, the energy storage system can continuously run at night when necessary, namely, when the thermal molten salt reserve in the hot storage tank 15 reaches the designed low level, the electric heating device is started to heat the molten salt from the cold storage tank 16, the heated molten salt is supplemented into the hot storage tank 15, the system operation is maintained, the heat storage duration of the hot molten salt is reduced, the consumption of the molten salt of the power station is reduced, and finally the investment cost of the power station is reduced.
2. In order to realize uninterrupted operation of the energy storage system at night, when the thermal molten salt reserve in the hot storage tank 15 reaches the designed low level in the latter half of the night, low-price electric power such as photovoltaic power, wind power, grid valley power and the like is utilized to drive an electric heating device through a transformer and a power distribution cabinet 1 to heat the molten salt from the cold low-level tank 22 and the cold storage tank 16, which is conveyed by a low-temperature pump 24, and the heated molten salt is conveyed and stored in the hot storage tank 15 by an output pump 10, so that the continuous operation of the hot molten salt source and the system of the steam generation system is maintained.
3. In the project debugging stage, solid molten salt is thrown into a salt tank from a feed port 2, an electric tracing device 9 on the wall of the salt tank is started to heat the salt tank and molten salt in the salt tank, the molten salt in the salt tank is slowly melted and heated to be slightly higher than the melting point of the molten salt (for example, the binary molten salt is heated to 260 ℃), then the solid molten salt is slowly added to melt on the basis of maintaining the temperature of the molten salt in the tank until the liquid molten salt in the salt tank reaches the minimum operation liquid level requirement (for example, 1/3 of the height of the inner wall of the salt tank), in the process, the molten salt can be uniformly mixed by starting a stirrer, and insoluble impurities in the solid molten salt are filtered through a filter screen 7. After that, the high-power electric heater 8 is driven to operate by low-price power such as photovoltaic power, wind power, grid valley power and the like through the transformer and the power distribution cabinet 1 so as to rapidly heat molten salt, the heated molten salt flows back to the position near the feed inlet 4 through the circulating valve through the output pump 10, the melting of the newly input solid molten salt is accelerated, the molten salt liquid level in the salt melting tank is gradually increased to between 1/2 and 2/3 of the tank body, the temperature of the molten salt in the tank is continuously heated until the molten salt at the output pump 10 is slightly lower than the boiling point of the molten salt (for example, binary salt is heated to 565 ℃), the first output valve 12 is opened at the moment, and high-temperature molten salt is continuously stored in the hot storage tank 15 and the hot low-level tank 21 until the whole salt melting work is completed.
4. When photovoltaic and wind power are generated greatly, the electric power which is needed to discard light and wind power originally is utilized to drive the high-power electric heater 8 to operate through the transformer and the power distribution cabinet 1, the low-temperature pump 24 positioned on the cold low-level tank 22 is opened, the low-temperature molten salt in the cold low-level tank 22 and the cold storage tank 16 is pumped into the salt melting tank through the low-temperature pump 24 and is heated through the electric heater 8, so that the operation of a heat absorption system is replaced or partially replaced, and the heated thermal molten salt is stored into the heat storage tank 15 through the first output valve 12 by the output pump 10, so that the effect of power station or power grid consumption is realized. In the night power generation low-valley stage, the power consumption peak stage or the heat consumption peak stage, a high-temperature pump 23 positioned on the heat low-level tank 21 is turned on, and the heat molten salt in the heat low-level tank 21 and the heat storage tank 15 is pumped into the SGS system through a fourth switch valve 20 to continuously generate steam and generate power, so that the peak regulation operation of the power station is realized.
5. When the temperature of molten salt in the hot storage tank 15/cold storage tank 16 is greatly reduced due to long-term shutdown maintenance or incapability of running in continuous overcast and rainy weather in a power station (especially a heat absorption system), photovoltaic, wind power or valley electricity can be utilized to drive a high-power electric heater 8 to run through a transformer and a power distribution cabinet 1, molten salt in the hot storage tank 15, the cold storage tank 16, the hot low-level tank 21 or the cold low-level tank 22 is conveyed to an electric heating device to be heated, and then the molten salt heated by the electric heating device is conveyed to the regenerative storage tank 15, the cold storage tank 16, the hot low-level tank 21 or the cold low-level tank 22, so that the molten salt in the hot storage tank 15, the cold storage tank 16, the hot low-level tank 21 or the cold low-level tank 22 is circulated, so that the molten salt in the hot storage tank 15, the cold storage tank 21 or the cold low-level tank 22 is maintained in a corresponding working temperature range.
The embodiments of the present invention have been described in detail with reference to the drawings, but the present invention is not limited to the above embodiments. Even if various changes are made to the present invention, it is within the scope of the appended claims and their equivalents to fall within the scope of the invention.
Claims (12)
1. An energy storage system, comprising:
the output end of the heat storage tank is communicated with an external heat utilization system through an energy storage system output pipeline;
the input end of the cold storage tank is communicated with an external heat utilization system through an energy storage system recovery pipeline;
the input end of the electric heating device is communicated with the output end of the hot storage tank and/or the cold storage tank through a heat storage medium input pipeline; the output end of the electric heating device is communicated with at least one of the input end of the hot storage tank, the input end of the cold storage tank and the output pipeline of the energy storage system through a heat storage medium output pipeline;
the output pump is arranged on the heat storage medium output pipeline or between the heat storage medium output pipeline and the output end of the electric heating device.
2. The energy storage system of claim 1, wherein the output end of the heat storage medium output line comprises a first output branch and a second output branch; the first output branch is communicated with the input end of the hot storage tank; the second output branch is communicated with the input end of the cold storage tank;
the input end of the heat storage medium input pipeline comprises a first input branch and a second input branch; the first input branch is communicated with the output end of the hot storage tank; the second input branch is communicated with the output end of the cold storage tank;
the first output branch, the second output branch, the first input branch and the second input branch are respectively and correspondingly provided with a first output valve, a second output valve, a first input valve and a second input valve.
3. The energy storage system of claim 1, further comprising a thermal lower tank, a thermal lower tank input pipe, a thermal lower tank output pipe, a high temperature pump;
the heat storage medium in the heat storage tank can fully or partially enter the heat low-level tank by means of self gravity;
the input end of the heat low-level tank input pipe is communicated with the output end of the heat storage tank and/or the heat storage medium output pipeline; the output end of the input pipe of the thermal low-level tank is communicated with the input end of the thermal low-level tank;
the input end of the output pipe of the thermal low-level tank is communicated with the output end of the thermal low-level tank; the output end of the output pipe of the thermal low-level tank comprises a third output branch and/or a fourth output branch, the third output branch is communicated with an external thermal system, and the fourth output branch is communicated with the heat storage medium input pipeline;
the high-temperature pump is arranged on the output pipe of the thermal low-level tank or between the output pipe of the thermal low-level tank and the output end of the thermal low-level tank;
and the first switch valve, the second switch valve and the third switch valve are respectively and correspondingly arranged on the input pipe, the third output branch and the fourth output branch of the thermal low-level tank.
4. The energy storage system of claim 3, wherein the thermal lower tank has a smaller volume than the thermal storage tank and a smaller height than the thermal storage tank.
5. The energy storage system of claim 1, further comprising a cold low tank, a cold low tank input pipe, a cold low tank output pipe, a cryogenic pump;
the cold low-level tank is arranged at a low level relative to the cold storage tank, and the heat storage medium in the cold storage tank can fully or partially enter the cold low-level tank by means of self gravity;
the input end of the cold low-level tank input pipe is communicated with the output end of the cold storage tank and/or the heat storage medium output pipeline; the output end of the cold low-level tank input pipe is communicated with the input end of the cold low-level tank;
the input end of the output pipe of the cold low-level tank is communicated with the output end of the cold low-level tank; the output end of the cold low-level tank output pipe comprises a fifth output branch and/or a sixth output branch, the fifth output branch is communicated with the input end of the external heat absorber, and the sixth output branch is communicated with the heat storage medium input pipeline;
the low-temperature pump is arranged on the cold low-level tank output pipe or between the cold low-level tank output pipe and the output end of the cold low-level tank;
and the cold low-level tank input pipe, the fifth output branch and the sixth output branch are respectively and correspondingly provided with a fourth switch valve, a fifth switch valve and a sixth switch valve.
6. The energy storage system of claim 5, wherein the cold low tank has a smaller volume than the cold storage tank and a smaller height than the cold storage tank.
7. The energy storage system of claim 2, wherein the output of the heat storage medium output line further comprises a seventh output branch, the output of the seventh output branch being in communication with the input of the external heat utilization system;
and the seventh output branch is provided with a temperature regulating valve.
8. The energy storage system of claim 1, wherein the external heat using system is an SGS system.
9. The energy storage system of claim 1, further comprising a connecting tube and a circulation valve;
the first end of the connecting pipe is communicated with the output end of the electric heating device or the heat storage medium output pipeline, and the second end of the connecting pipe is communicated with the input end of the electric heating device or the heat storage medium input pipeline;
the circulating valve is arranged on the connecting pipe or between the output end of the electric heating device and the connecting pipe.
10. The energy storage system of claim 9, wherein the electrical heating device comprises a solid state heat storage medium charge;
the output end of the solid heat storage medium feeding part is matched with the feeding port of the electric heating device.
11. The energy storage system of claim 1, wherein the source of electrical power for the electrical heating device is at least one of photovoltaic power, wind power, and grid valley power.
12. A tower solar thermal power generation system, comprising: a heat sink, an SGS system, a steam turbine, a generator, and an energy storage system according to any one of claims 1 to 11;
the output end of the cold storage tank is communicated with the input end of the heat absorber through a pipeline;
the output end of the heat absorber is communicated with the input end of the hot storage tank through a pipeline;
the heat storage medium input end of the SGS system is communicated with the output end of the hot storage tank and/or the output end of the electric heating device through a pipeline, the heat storage medium output end of the SGS system is communicated with the input end of the cold storage tank, and the SGS system receives the heat storage medium and outputs high-temperature and high-pressure steam to drive the steam turbine to drive the generator to generate electricity.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117791961A (en) * | 2024-02-26 | 2024-03-29 | 浙江西子联合工程有限公司 | Energy storage device kinetic energy recovery device, steam turbine power generation system and heating system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117791961A (en) * | 2024-02-26 | 2024-03-29 | 浙江西子联合工程有限公司 | Energy storage device kinetic energy recovery device, steam turbine power generation system and heating system |
| CN117791961B (en) * | 2024-02-26 | 2024-05-17 | 浙江西子联合工程有限公司 | Energy storage device kinetic energy recovery device, steam turbine power generation system and heating system |
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