CN219433883U - Electricity storage and heat storage system - Google Patents
Electricity storage and heat storage system Download PDFInfo
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- CN219433883U CN219433883U CN202320292285.5U CN202320292285U CN219433883U CN 219433883 U CN219433883 U CN 219433883U CN 202320292285 U CN202320292285 U CN 202320292285U CN 219433883 U CN219433883 U CN 219433883U
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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
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- Y02E60/14—Thermal energy storage
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Abstract
The utility model relates to the technical field of energy storage, in particular to an electricity storage and heat storage system. The electricity storage and heat storage system stores or releases electric energy by utilizing the electricity storage capacity of the liquid metal battery so as to consume renewable energy sources to discard electricity or consume thermal power generating units to generate electricity, so that the deep peak regulation capacity of the thermal power generating units is improved, the energy conversion efficiency can be improved, and the energy loss is reduced by directly storing the electric energy through the liquid metal battery; meanwhile, the heat conduction molten salt in the molten salt tank can exchange heat with the liquid metal battery, and further the molten salt pump is combined to drive the heat conduction molten salt to circulate in the heat storage and release loop and the heat conduction molten salt and water in the thermal power generating unit exchange heat in the heat exchange device, so that heat transfer of the heat conduction molten salt and heat storage or release of the liquid metal battery can be realized, electric heating and heat storage are realized through the liquid metal battery, flexibility of the thermal power generating unit can be enhanced, energy utilization efficiency is improved, and overall economic benefit can be improved compared with that of a single molten salt heat storage system.
Description
Technical Field
The utility model relates to the technical field of energy storage, in particular to an electricity storage and heat storage system.
Background
Due to the intermittent and fluctuating characteristics of renewable energy sources such as wind power, photovoltaic and the like, the peak clipping and valley filling are realized by means of the deep peak clipping capability of the flexible thermal power unit, and the comprehensive utilization efficiency of the renewable energy sources is improved. The thermal power generating unit has the advantages of large basic capacity, large energy to be stored during deep peak shaving, high quality, high heat energy storage by molten salt, high heat energy storage by utilizing the change of the temperature of molten salt, and the like, and is suitable for deep peak shaving of the thermal power generating unit.
However, the current fused salt heat storage system stores energy in a mode of combining electric heating and steam heating, and supplies heat to steam to drive a steam turbine to generate electricity through heat exchange to release energy, the total amount of required fused salt is large, the peak regulation capacity is limited, the fused salt heat storage system can only store and release heat, direct storage and release of electric energy cannot be realized, and the running economy of the system is low.
Disclosure of Invention
Therefore, the technical problem to be solved by the utility model is to overcome the defects of limited peak regulation capacity and low economic benefit of the fused salt heat storage system in the prior art, thereby providing the electricity and energy storage system which can improve the peak regulation capacity and has high economic benefit.
In order to solve the above problems, the present utility model provides an electricity and heat storage system comprising: the thermal power generating unit is provided with an external power supply end and is suitable for generating power and supplying power to the outside; the charging and discharging system comprises a liquid metal battery, a converter, a power discarding access end and an external power supply end, wherein the liquid metal battery is electrically connected with the converter, and the power discarding access end is selectively electrically connected with the converter so as to store renewable energy power discarding quantity into the liquid metal battery; the external power supply end is selectively and electrically connected with the converter so as to store surplus electric quantity of the thermal power unit in the liquid metal battery or externally supply power to the liquid metal battery through the external power supply end; the heat storage and release loop comprises a molten salt tank, a molten salt pump, a heat exchange device and a liquid metal battery which are sequentially connected, wherein the liquid metal battery is arranged in the molten salt tank and is suitable for heat exchange with heat conduction molten salt in the molten salt tank; the molten salt pump is suitable for driving the heat conduction molten salt to circulate in the heat storage and release loop; the heat exchange device is suitable for being communicated with the thermal power unit when the liquid metal battery stores or releases heat, so that heat exchange between the heat conduction molten salt and water in the thermal power unit occurs in the heat exchange device.
Optionally, the heat exchange device comprises: the device comprises a feed water heater and a heat exchanger which are sequentially connected, wherein the feed water heater is suitable for being communicated with a thermal power unit when a liquid metal battery releases heat, and heat exchange occurs between heat conduction molten salt and water in the thermal power unit in the feed water heater so as to heat the water in the thermal power unit; the heat exchanger is suitable for being communicated with the thermal power generating unit when the liquid metal battery stores heat, and water in the thermal power generating unit and the heat conduction fused salt are subjected to heat exchange in the heat exchanger so as to heat the heat conduction fused salt.
Optionally, the thermal power generating unit includes steam circulation loop and generator, and steam circulation loop includes boiler, steam turbine, condensing module and the feed pump that connects gradually, and the boiler is suitable for producing steam to drive steam turbine operation, condensing module is suitable for cooling steam, in order to condense into water, and the feed pump is suitable for driving water and flows in steam circulation loop, and the generator is connected with the steam turbine, and the steam turbine drives the generator operation.
Optionally, the water vapor circulation loop further comprises: the deaerator is connected to the upstream of the water feeding pump; the first heater group is connected between the condensation module and the deaerator; the second heater group is connected between the water supply pump and the boiler; and the first valve is connected between the water feeding pump and the second heater group.
Optionally, the heat exchanger comprises a first inlet and a first outlet, the first inlet is optionally in communication with the boiler, and the first outlet is connected to a pipeline between the first heater group and the deaerator.
Optionally, the electricity and heat storage system further comprises: and the second valve is connected between the boiler and the first inlet.
Optionally, the feedwater heater includes a second inlet and a second outlet, the second inlet being selectively connectable to a conduit between the feedwater pump and the first valve, the second outlet being in communication with the boiler.
Optionally, the electricity and heat storage system further comprises: and the third valve is connected between the feed pump and the feed water heater.
Optionally, the condensing module comprises a condenser and a condensate pump, the condenser is connected to the downstream of the steam turbine, and the condensate pump is connected to the downstream of the condenser.
Optionally, the charge-discharge system further includes: the first switch is arranged between the power-off access end and the current transformer to control the on-off of a circuit between the power-off access end and the current transformer; the second switch is arranged between the external power supply end and the converter to control the on-off of a circuit between the external power supply end and the converter.
The utility model has the following advantages:
the electric quantity of renewable energy source waste electricity is stored in the liquid metal battery from the waste electric access end by arranging the waste electric access end of the charging and discharging system and the converter and the liquid metal battery to form a circuit, meanwhile, the circuit is formed by arranging the external power supply end and the converter and the liquid metal battery, and the change of the current direction in the circuit is combined with the converter, the surplus electric quantity of the thermal power unit can be stored in the liquid metal battery from the external power supply end or the electric quantity in the liquid metal battery is supplied to the outside through the external power supply end, so that the electric energy is stored or released by utilizing the electric energy storage capacity of the liquid metal battery to consume renewable energy to discard electricity or consume the power generation of the thermal power unit, the deep peak regulation capacity of the thermal power unit is improved, the energy conversion efficiency can be improved, and the energy loss is reduced; meanwhile, the molten salt is adopted as electrolyte in the liquid metal battery, so that the liquid metal battery is provided with heat storage capacity, heat conduction molten salt in the molten salt tank can exchange heat with the liquid metal battery through placing the liquid metal battery in the molten salt tank, and further the molten salt pump is combined to drive the heat conduction molten salt to circulate in a heat storage loop and the heat conduction molten salt to exchange heat with water in a thermal power generating unit in a heat exchange device, so that heat transfer of the heat conduction molten salt and heat storage or release of the liquid metal battery can be realized, electric heating and heat storage are realized through the liquid metal battery, the flexibility of the thermal power generating unit can be enhanced, the energy utilization efficiency is improved, the deep peak regulation capacity of the thermal power generating unit is improved, and the overall economic benefit can be improved compared with a single molten salt heat storage system.
Drawings
In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present utility model, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
Fig. 1 shows a schematic structural diagram of an electricity and heat storage system according to an embodiment of the present utility model.
Reference numerals illustrate:
1. a boiler; 2. a high-pressure cylinder; 3. a medium pressure cylinder; 4. a low pressure cylinder; 5. a generator; 6. a condenser; 7. a condensate pump; 8. a first heater group; 9. a deaerator; 10. a water feed pump; 11. a first valve; 12. a second heater group; 13. a second valve; 14. a feedwater heater; 15. a third valve; 16. a molten salt pump; 17. a heat exchanger; 18. a liquid metal cell; 19. a salt melting tank; 191. a thermally conductive molten salt; 20. discarding the electric access terminal; 21. a first switch; 22. a current transformer; 23. a second switch; 24. and an external power supply end.
Detailed Description
The following description of the embodiments of the present utility model will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the utility model are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
In the description of the present utility model, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.
In addition, the technical features of the different embodiments of the present utility model described below may be combined with each other as long as they do not collide with each other.
As shown in fig. 1, the electricity and heat storage system provided in this embodiment includes: the thermal power generating unit, the charging and discharging system and the heat storage and release loop are provided with an external power supply end 24, and the thermal power generating unit is suitable for generating power and supplying power to the outside; the charging and discharging system comprises a liquid metal battery 18, a converter 22, a power discarding access terminal 20 and an external power supply terminal 24, wherein the liquid metal battery 18 is electrically connected with the converter 22, and the power discarding access terminal 20 is selectively electrically connected with the converter 22 so as to store renewable energy power discarding quantity into the liquid metal battery 18; the external power supply end 24 is selectively electrically connected with the converter 22, so as to store surplus electric quantity of the thermal power unit in the liquid metal battery 18 or the liquid metal battery 18 supplies power to the outside through the external power supply end 24; the heat storage and release loop comprises a molten salt tank 19, a molten salt pump 16, a heat exchange device and a liquid metal battery 18 which are sequentially connected, wherein the liquid metal battery 18 is suitable for heat exchange with heat conduction molten salt 191 in the molten salt tank 19; the molten salt pump 16 is adapted to drive the heat conducting molten salt 191 to circulate in the heat storage circuit; the heat exchange device is adapted to communicate with the thermal power plant when the liquid metal battery 18 stores or releases heat, so that the heat conducting molten salt 191 exchanges heat with water in the thermal power plant in the heat exchange device.
By using the electricity storage and heat storage system of the embodiment, the electricity discarding access end 20 of the charging and discharging system can be connected with the converter 22 and the liquid metal battery 18 to form a circuit, so that the renewable energy electricity discarding capacity is stored from the electricity discarding access end 20 into the liquid metal battery 18, meanwhile, the external power supply end 24 can be connected with the converter 22 and the liquid metal battery 18 to form a circuit, and the change of the current direction in the circuit is combined with the change of the converter 22, the surplus capacity of the thermal power unit can be stored from the external power supply end 24 into the liquid metal battery 18 or the electric capacity in the liquid metal battery 18 can be supplied to the outside through the external power supply end 24, and therefore the electricity storage capacity of the liquid metal battery 18 is utilized to store or release the electric energy, the renewable energy electricity discarding capacity or the power generation capacity of the thermal power unit can be consumed, the deep peak regulating capacity of the thermal power unit can be improved, the energy conversion efficiency can be improved, and the energy loss can be reduced through the direct storage of the liquid metal battery 18; meanwhile, the liquid metal battery 18 is internally provided with the molten salt as an electrolyte, so that the liquid metal battery 18 is provided with heat storage capacity, the liquid metal battery 18 is placed in the molten salt tank 19, the heat conduction molten salt 191 in the molten salt tank 19 can exchange heat with the liquid metal battery 18, the molten salt pump 16 is further combined to drive the heat conduction molten salt 191 to circulate in a heat storage and release loop, and the heat conduction molten salt 191 exchanges heat with water in a thermal power unit in a heat exchange device, so that heat transfer of the heat conduction molten salt 191 and heat storage or release of the liquid metal battery 18 can be realized, electric heating and heat storage are realized through the liquid metal battery 18, the flexibility of the thermal power unit can be enhanced, the energy utilization efficiency can be improved, the deep peak regulation capacity of the thermal power unit can be improved, and the overall economic benefit can be improved compared with a single molten salt heat storage system.
It should be noted that, both the positive and negative electrodes of the liquid metal battery 18 are insulated from the heat conducting molten salt 191 in the molten salt tank 19, and the heat conducting molten salt 191 contacts with the outer shell of the liquid metal battery 18 to realize heat exchange between the two; the liquid metal battery 18 adopts liquid metal and inorganic molten salt as electrodes and electrolyte, has the advantages of long service life, quick response, low cost, safety, reliability and the like, is an ideal choice in the application field of large-scale energy storage, and when the liquid metal battery works, both the positive and negative metal and the inorganic salt electrolyte (molten salt) are in a molten state, and the liquid metal and the inorganic molten salt are mutually immiscible and automatically divided into three layers due to density difference, and based on the unique structure, the liquid metal battery can realize the storage and release of electricity and heat at the same time. Wherein the molten salt inside the liquid metal cell 18 is sealed inside the cell, and is not in contact with the heat conductive molten salt 191 in the molten salt tank 19.
It should be noted that, the current converter 22 may control the current to flow in two directions to change the current direction in the circuit, when the renewable energy source has surplus electricity generated by electricity discarding or thermal power generating, the current in the current converter 22 controls the current in the circuit to flow from the electricity discarding access terminal 20 or the external power supply terminal 24 to the current converter 22 and then flow in the direction of the liquid metal battery 18, so as to charge the liquid metal battery 18, and the liquid metal battery 18 stores the electric energy; when the external power supply capability needs to be improved, the current direction in the control circuit of the converter 22 is the direction from the liquid metal battery 18 to the converter 22 and the external power supply end 24, so that the electric quantity stored in the liquid metal battery 18 is released to the external circuit through the external power supply end 24. The electricity discarding access terminal 20 refers to a port of a electricity discarding access charging and discharging system in renewable energy power generation, wherein electricity discarding of renewable energy can be surplus electric quantity in the renewable energy power generation process of wind power, photovoltaic and the like, or generated energy when the renewable energy cannot be integrated into a power grid due to large fluctuation of generated power.
In this embodiment, the charge and discharge system further includes: the first switch 21 and the second switch 23, the first switch 21 is arranged between the power-off access terminal 20 and the current transformer 22 to control the on-off of a circuit between the power-off access terminal 20 and the current transformer 22; the second switch 23 is arranged between the external power supply end 24 and the converter 22 to control the on-off of a circuit between the external power supply end 24 and the converter 22, and has simple structure and convenient operation. It should be noted that, when the electric energy discarded from the renewable energy source needs to be stored in the liquid metal battery 18, the first switch 21 is turned on, and then the electric energy discarded access terminal 20, the converter 22 and the liquid metal battery 18 form a connected charging circuit, so as to store the electric energy discarded from the renewable energy source in the liquid metal battery 18, and when the electric energy discarded from the renewable energy source does not need to be stored in the liquid metal battery 18, the first switch 21 is turned off, so as to cut off the charging circuit; similarly, when the generated energy of the thermal power unit is surplus, the second switch 23 is turned on, and the current in the circuit is controlled by the converter 22 to flow from the external power supply end 24 to the converter 22 and then to the liquid metal battery 18, the external power supply end 24, the converter 22 and the liquid metal battery 18 form a communicated charging circuit, so that the surplus electric quantity of the thermal power unit is stored in the liquid metal battery 18, and when the surplus electric quantity of the thermal power unit is not needed to be stored, the second switch 23 is turned off, so that the charging circuit is cut off; similarly, when the electric quantity stored in the liquid metal battery 18 needs to be released to an external circuit, the second switch 23 is turned on, and the current in the circuit is controlled by the current transformer 22 to flow from the liquid metal battery 18 to the current transformer 22 and then to the external power supply end 24, so as to form a discharging circuit, and the electric energy in the liquid metal battery 18 is released to the external circuit through the external power supply end 24, and when the electric quantity stored in the liquid metal battery 18 does not need to be released or the electric quantity stored in the liquid metal battery 18 is completely released, the second switch 23 is turned off, so that the discharging circuit is cut off.
Specifically, the converter 22 has a first interface, a second interface, and a third interface; the liquid metal battery 18 is connected with the first interface through a wire; the power-off access terminal 20, the first switch 21 and the second interface are connected through wires in sequence; the external power supply end 24, the second switch 23 and the third interface are sequentially connected through wires.
In this embodiment, the heat exchange device includes: the water heater 14 and the heat exchanger 17 are connected in sequence, the water heater 14 is suitable for being communicated with a thermal power unit when the liquid metal battery 18 releases heat, and the heat conduction molten salt 191 exchanges heat with water in the thermal power unit in the water heater 14 so as to heat the water in the thermal power unit; the heat exchanger 17 is adapted to communicate with a thermal power unit when the liquid metal battery 18 stores heat, and water in the thermal power unit exchanges heat with the heat conducting molten salt 191 in the heat exchanger 17 to heat the heat conducting molten salt 191. Specifically, the outlet of the molten salt tank 19, the molten salt pump 16, the feedwater heater 14, the heat exchanger 17, and the inlet of the molten salt tank 19 are sequentially connected through pipes, so that the circulation of the heat conducting molten salt 191 in the heat storage and release loop is realized. When the heat energy of the thermal power generating unit is excessive, the heat conduction molten salt 191 is heated by utilizing water with higher temperature in the thermal power generating unit, and then the heated heat conduction molten salt 191 can exchange heat with the liquid metal battery 18, so that the heat energy is stored in the liquid metal battery 18; when the thermal power unit needs more heat energy, the water in the thermal power unit is heated by utilizing the heat released by the liquid metal battery 18, so that the water before entering the boiler 1 is preheated, the consumption of energy sources of the thermal power unit can be reduced, the full utilization of the heat energy is realized by storing and releasing the heat energy by the liquid metal battery 18, the energy consumption is reduced, and the energy utilization rate is improved.
The thermal power generating unit heats water through the boiler 1 to form steam, the steam is used as power for generating electricity, then the steam is cooled and then becomes water, and the water enters the boiler again to be heated, so that circulation is realized. The water in the feedwater heater 14, which is subjected to heat exchange with the heat-conducting molten salt 191, is water formed after steam cooling, the temperature of the water at the moment is lower, and the heat-conducting molten salt 191 flowing into the feedwater heater 14 is the heat-conducting molten salt 191 with relatively higher temperature after heat exchange with the exothermic liquid metal battery 18, so that the heat-conducting molten salt 191 and the water in the thermal power unit are subjected to heat exchange in the feedwater heater 14, and the water in the thermal power unit can be heated; the water heat-exchanged with the heat-conducting molten salt 191 in the heat exchanger 17 is the steam led out from the boiler 1 and has a higher temperature, and the heat-conducting molten salt 191 flowing into the heat exchanger 17 is the heat-conducting molten salt 191 with a relatively lower temperature after heat exchange with the heat-storage liquid metal battery 18, so that the heat-conducting molten salt 191 and the steam in the thermal power generating unit are heat-exchanged in the heat exchanger 17, the heat-conducting molten salt 191 can be heated, and the heated heat-conducting molten salt 191 and the liquid metal battery 18 are heat-exchanged, so that the liquid metal battery 18 is heated, and the heat storage of the liquid metal battery 18 is realized.
In this embodiment, the thermal power generating unit includes steam circulation loop and generator 5, the steam circulation loop includes boiler 1, the steam turbine, condensation module and feed pump 10 that connect gradually, boiler 1 is suitable for producing steam with water heating, in order to drive the steam turbine operation, condensation module is suitable for the steam that the cooling comes out from the steam turbine, in order to condense into water, feed pump 10 is suitable for driving water and flows in the steam circulation loop, realize the cyclic utilization of water, the main shaft of steam turbine is connected with generator 5, the steam turbine drives generator 5 operation, thereby realize the electricity generation of generator 5, generator 5 passes through the wire and connects external power supply end 24. The thermal power generating unit (i.e., thermal power generating unit) is a unit which uses coal, oil, or flammable gas as fuel, heats water in the boiler 1 to raise the temperature, and then uses steam with a certain pressure to drive the gas turbine to generate power, so that the technology is mature and the application is wide. Specifically, the water is heated into steam in the boiler 1, the steam is further heated by the heater to become superheated steam, and then the superheated steam enters the steam turbine through the main steam pipeline, and the steam flowing at a high speed drives the blades of the steam turbine to rotate due to continuous expansion of the steam, so that the generator is driven to operate.
In this embodiment, the steam turbine includes a high-pressure cylinder 2, a middle-pressure cylinder 3 and a low-pressure cylinder 4, a steam outlet of the boiler 1 is connected with an inlet of the high-pressure cylinder 2 through a pipeline, an outlet of the high-pressure cylinder 2 is connected with a reheat steam inlet of the boiler 1 through a pipeline, a reheat steam outlet of the boiler 1 is connected with an inlet of the middle-pressure cylinder 3 through a pipeline, and the middle-pressure cylinder 3, the low-pressure cylinder 4 and a condenser 6 are sequentially connected through pipelines. The reheat cycle is realized through the high pressure cylinder 2, the medium pressure cylinder 3 and the low pressure cylinder 4 of the steam turbine, namely, the steam which has done a certain work is extracted from the outlet of the high pressure cylinder 2 of the steam turbine, is sent to the reheat steam of the boiler to be heated and then is led into the medium pressure cylinder 3 of the steam turbine to continue to expand and do work, and the steam sent from the medium pressure cylinder 3 is sent to the low pressure cylinder 4 to continue doing work. In the process of continuously acting on the steam, the pressure and the temperature of the steam are continuously reduced, and finally the steam is discharged into the condenser 6 and cooled by cooling water to be condensed into water.
In this embodiment, the condensing module includes a condenser 6 and a condensate pump 7, the condenser 6 is connected downstream of the steam turbine, and the condensate pump 7 is connected downstream of the condenser 6. Specifically, the low-pressure cylinder 4, the condenser 6 and the condensate pump 7 of the steam turbine are sequentially connected through pipelines, so that the condensation of steam and the driving of water formed after the condensation are realized, the condensation effect is good, and the circulating flow of water in a water vapor circulating system is facilitated.
In this embodiment, the water vapor circulation circuit further includes: the deaerator 9, the first heater group 8, the second heater group 12 and the first valve 11 are connected to the upstream of the water feed pump 10, and are used for removing non-condensed gases such as oxygen, carbon dioxide and the like in water, preventing equipment and pipelines from being corroded and improving safety; the first heater group 8 is connected between the condensation module and the deaerator 9, the second heater group 12 is connected between the water feeding pump 10 and the boiler 1, wherein the first heater group 8 is a low-pressure heater group, the second heater group 12 is a high-pressure heater group, and steam which has done partial work in the steam turbine is pumped into the heaters to heat water, so that the temperature of the water is increased, the steam amount discharged into the condenser by the steam turbine is reduced, the energy loss is reduced, and the circulation efficiency of the thermodynamic system is improved; the first valve 11 is connected between the feed pump 10 and the second heater group 12 to control the amount of water flow into the second heater group 12. Specifically, the outlet of the condenser 6, the condensate pump 7, the first heater group 8, the deaerator 9, the water supply pump 10, the first valve 11 and the second heater group 12 are sequentially connected through pipelines, the outlet of the second heater group 12 is connected with the water supply inlet of the boiler 1 through a pipeline, and hot water heated by the second heater group 12 enters the boiler 1 again to be heated to form steam, so that the circulation of the water in the whole water vapor circulation loop is realized.
In the present embodiment, the heat exchanger 17 comprises a first inlet, which is optionally in communication with the boiler 1, and a first outlet, which is connected to the piping between the first heater group 8 and the deaerator 9. When the heat of the thermal power generating unit is excessive and the liquid metal battery 18 is required to store the heat, the first inlet is communicated with the boiler 1, the excessive steam in the boiler 1 enters the heat exchanger 17, the heat of the high-pressure steam is transferred to the heat-conducting fused salt 191 in the heat exchanger 17, condensed water vapor returns to the deaerator 9 through the first outlet after heat exchange, and the fused salt pump 16 drives the heat-conducting fused salt 191 to flow into the fused salt tank 19 so as to transfer the heat to the liquid metal battery 18 for storage; and when the liquid metal battery 18 is not needed for storing heat, the first inlet is not communicated with the boiler 1, and no high-pressure steam enters the heat exchanger 17.
In this embodiment, the electricity and heat storage system further includes: a second valve 13, the second valve 13 being connected between the boiler 1 and the first inlet. The on-off of the first inlet and the boiler 1 is controlled through the second valve 13, so that the operation is convenient and the stability is good.
In the present embodiment, the feedwater heater 14 includes a second inlet and a second outlet, the second inlet being selectively connected to a pipe between the feedwater pump 10 and the first valve 11, the second outlet being in communication with the boiler 1. Specifically, the second outlet is connected to the outlet of the second heater group 12, and the second outlet and the outlet of the second heater group 12 are both connected to the feed water inlet of the boiler 1. When the liquid metal battery 18 needs to release heat, the second inlet is connected to the outlet of the feed water pump 10, the feed water pump 10 drives water to enter the feed water heater 14 from the second inlet, the molten salt pump 16 drives the heat conducting molten salt 191 to flow, so that the heat in the liquid metal battery 18 is brought into the feed water heater 14 to exchange heat with the water, the water is heated, the heat in the liquid metal battery 18 is released, and the heated water flows out of the second outlet to the boiler 1; and when the liquid metal battery 18 does not need to release heat, the pipeline between the water feeding pump 10 and the first valve 11 is not communicated with the second inlet, and water of the water vapor free circulation loop enters the water feeding heater 14.
In this embodiment, the electricity and heat storage system further includes: a third valve 15 and a second valve 13 are connected between the feedwater pump 10 and the feedwater heater 14. The third valve 15 is used for controlling the on-off of the second inlet and the water feeding pump 10 and the water flow, so that the operation is convenient and the stability is good.
Specifically, the water flowing out of the water feed pump 10 is divided into two paths, namely, enters the second heater group 12 through the first valve 11 and enters the water feed heater 14 through the third valve 15, and the water flow flowing through the water feed heater 14 is controlled by the first valve 11 and the third valve 15 together, so that the energy of heat exchange is controlled, the energy can be regulated and controlled according to actual requirements, and the water feed pump is simple in structure and convenient to operate.
From the above description, it can be seen that the above-described embodiments of the present utility model achieve the following technical effects:
1. the power storage capacity of the liquid metal battery 18 is utilized to consume renewable energy sources to discard electricity or to consume power generation of the thermal power generating unit, so that the deep peak regulation capacity of the thermal power generating unit is improved. When surplus electric quantity exists, electric energy is directly stored, the electric-heat-electricity mode of electric heating fused salt heat storage and steam generation by high-temperature fused salt in the prior art for driving a steam turbine to generate electricity is avoided, the energy conversion efficiency is improved, and the energy loss is reduced.
2. The liquid metal battery 18 adopts molten salt as electrolyte, and simultaneously has heat storage capacity, and when the thermal power unit is in peak regulation, high-temperature steam can be supplied to the liquid metal battery 18 at the same time, heat is stored in the liquid metal battery 18, and the deep peak regulation capacity of the thermal power unit is improved.
Compared with the prior art, the embodiment constructs the electricity storage and heat storage system of the combined thermal power generating unit by adopting the liquid metal battery 18, when the thermal power generating unit needs to reduce load or the energy source is abandoned, the electric energy can be directly stored in the liquid metal battery 18, and meanwhile, part of high-pressure steam of the unit is extracted to store heat in molten salt electrolyte of the liquid metal battery 18, so that the output of the thermal power generating unit is effectively reduced; when the thermal power unit needs to be loaded, the electric quantity stored in the liquid metal battery 18 is directly released, and heat is transferred to boiler water supply through the heat conducting molten salt 191, so that the output of the thermal power unit is effectively improved; the heat generated by the internal resistance of the battery during the charge and discharge of the liquid metal battery 18 is also synchronously stored in the battery electrolyte, and the output of the thermal power unit can be increased by transferring the heat. Therefore, the flexibility of the thermal power generating unit can be enhanced, the energy utilization efficiency is improved, the deep peak shaving capacity of the thermal power generating unit is improved, and the overall economic benefit can be improved compared with a single molten salt heat storage system.
It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. While still being apparent from variations or modifications that may be made by those skilled in the art are within the scope of the utility model.
Claims (10)
1. An electrical and thermal storage system, comprising:
the thermal power generating unit is provided with an external power supply end (24) and is suitable for generating power and supplying power to the outside;
the charging and discharging system comprises a liquid metal battery (18), a current transformer (22), a power discarding access terminal (20) and the external power supply terminal (24), wherein the liquid metal battery (18) is electrically connected with the current transformer (22), and the power discarding access terminal (20) is selectively electrically connected with the current transformer (22) so as to store renewable energy power discarding quantity into the liquid metal battery (18); the external power supply end (24) is selectively and electrically connected with the converter (22) so as to store surplus electric quantity of the thermal power generating unit in the liquid metal battery (18) or externally supply power to the liquid metal battery (18) through the external power supply end (24);
the heat storage and release loop comprises a molten salt tank (19), a molten salt pump (16), a heat exchange device and the liquid metal battery (18) which are sequentially connected, wherein the liquid metal battery (18) is arranged in the molten salt tank (19), and the liquid metal battery (18) is suitable for heat exchange with heat conduction molten salt (191) in the molten salt tank (19); -the molten salt pump (16) is adapted to drive the heat conducting molten salt (191) to circulate in the heat storage and release circuit; the heat exchange device is adapted to communicate with the thermal power plant when the liquid metal battery (18) stores or releases heat, so that the heat conducting molten salt (191) exchanges heat with water in the thermal power plant in the heat exchange device.
2. The electrical and thermal storage system of claim 1 wherein the heat exchange means comprises: a feed water heater (14) and a heat exchanger (17) which are connected in sequence, wherein the feed water heater (14) is suitable for being communicated with the thermal power unit when the liquid metal battery (18) releases heat, and the heat conducting molten salt (191) and water in the thermal power unit generate heat exchange in the feed water heater (14) so as to heat the water in the thermal power unit; the heat exchanger (17) is adapted to communicate with the thermal power plant when the liquid metal battery (18) stores heat, and water in the thermal power plant and the heat conducting molten salt (191) exchange heat in the heat exchanger (17) to heat the heat conducting molten salt (191).
3. The electricity and heat storage system according to claim 2, characterized in that the thermal power plant comprises a steam circulation loop and a generator (5), the steam circulation loop comprises a boiler (1), a steam turbine, a condensation module and a feed water pump (10) which are connected in sequence, the boiler (1) is suitable for generating steam to drive the steam turbine to operate, the condensation module is suitable for cooling the steam to condense into water, the feed water pump (10) is suitable for driving the water to flow in the steam circulation loop, the generator (5) is connected with the steam turbine, and the steam turbine drives the generator (5) to operate.
4. The electrical and thermal storage system of claim 3 wherein the water vapor circulation loop further comprises:
a deaerator (9) connected upstream of the feed pump (10);
a first heater group (8) connected between the condensation module and the deaerator (9);
a second heater group (12) connected between the feed pump (10) and the boiler (1);
a first valve (11) connected between the feed pump (10) and the second heater group (12).
5. The electricity and heat storage system according to claim 4, characterized in that the heat exchanger (17) comprises a first inlet, which is optionally in communication with the boiler (1), and a first outlet, which is connected on a line between the first heater group (8) and the deaerator (9).
6. The electrical and thermal storage system of claim 5, further comprising: -a second valve (13), said second valve (13) being connected between said boiler (1) and said first inlet.
7. The electricity and heat storage system according to claim 6, characterized in that the feedwater heater (14) comprises a second inlet and a second outlet, the second inlet being selectively connected to a line between the feedwater pump (10) and the first valve (11), the second outlet being in communication with the boiler (1).
8. The electrical and thermal storage system of claim 7, further comprising: -a third valve (15), the third valve (15) being connected between the feedwater pump (10) and the feedwater heater (14).
9. A power and heat storage system according to claim 3, characterized in that the condensing module comprises a condenser (6) and a condensate pump (7), the condenser (6) being connected downstream of the steam turbine, the condensate pump (7) being connected downstream of the condenser (6).
10. The electrical and thermal storage system according to any one of claims 1 to 9, wherein the charge and discharge system further comprises:
the first switch (21) is arranged between the power-off access end (20) and the current transformer (22) so as to control the on-off of a circuit between the power-off access end (20) and the current transformer (22);
and the second switch (23) is arranged between the external power supply end (24) and the converter (22) so as to control the on-off of a circuit between the external power supply end (24) and the converter (22).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320292285.5U CN219433883U (en) | 2023-02-22 | 2023-02-22 | Electricity storage and heat storage system |
| JP2023001011U JP3242127U (en) | 2023-02-22 | 2023-03-31 | Power storage and heat storage system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320292285.5U CN219433883U (en) | 2023-02-22 | 2023-02-22 | Electricity storage and heat storage system |
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