CN210622880U - Multi-stage heat pump type double-tank molten salt energy storage power generation system - Google Patents
Multi-stage heat pump type double-tank molten salt energy storage power generation system Download PDFInfo
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- CN210622880U CN210622880U CN201920901949.7U CN201920901949U CN210622880U CN 210622880 U CN210622880 U CN 210622880U CN 201920901949 U CN201920901949 U CN 201920901949U CN 210622880 U CN210622880 U CN 210622880U
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Abstract
The utility model provides a two jar fused salt energy storage power generation systems of multistage heat pump formula, include: the high-temperature molten salt tank, the low-temperature molten salt tank, the high-temperature antifreezing liquid tank, the low-temperature antifreezing liquid tank, the compressor, the first heat pump, the low-temperature molten salt pump, the high-temperature molten salt pump, the turbine, the second heat pump, the high-temperature antifreezing liquid pump, the low-temperature antifreezing liquid pump, the first heat exchanger, the second heat exchanger and the generator are selectively opened, and electric energy and heat energy are converted into each other by selectively opening one or more of the high-temperature molten salt tank, the low-temperature molten salt tank, the high-temperature antifreezing liquid tank, the low-temperature antifreezing liquid tank, the compressor, the first heat pump, the low-temperature molten salt pump, the high-temperature molten salt pump, the turbine, the second heat pump, the high-temperature antifreezing. The utility model discloses can realize the stable output of renewable energy electric power such as wind-powered electricity generation or photovoltaic power generation, have balanced electric power supply and demand effect, can realize extensive energy storage, performance energy storage peak shaving advantage solves renewable energy storage problem.
Description
Technical Field
The utility model relates to an energy storage technical field, in particular to two jar fused salt energy storage power generation systems of multistage heat pump formula.
Background
The fused salt heat storage technology is that in the heat storage stage, fused salt is heated by electric energy, solar energy and other energy sources, and heat is stored in high-temperature fused salt. The heat is released through the high-temperature fused salt in the heat supply stage, the high-temperature fused salt releases heat to a heat user through heat exchange, the form of releasing heat is multiple forms such as supplying steam, pushing a steam turbine to generate electricity, supplying heat through supplying steam, and the like, so that the solar heat power station heat storage system is applicable to energy storage systems such as renewable energy electric quantity absorption, off-peak electricity utilization and the like of a photothermal power station heat storage, a thermal power plant peak regulation, an off-wind light abandoning and the like, and plays roles of shifting peaks and filling valleys.
At present, related technologies provide a heat pump type alternative energy storage power supply method and apparatus, including an energy storage heat supply mode and a power supply heat supply mode. The two sets of heat storage systems alternately store and release energy under the modes of energy storage and heat supply and power supply and heat supply respectively to achieve the functions of energy storage and power supply. When an energy storage heat supply mode is adopted, a normal-temperature working medium absorbs heat through a first heat storage system in an isobaric manner, is subjected to adiabatic compression through a compressor, releases heat through a second heat storage system in an isobaric manner, then enters a turbine for adiabatic expansion to apply work to the outside, and finally is released to the outside as a heating source; the device is sequentially connected with an air inlet device, a first heat exchanger, a first heat storage system, a compressor, a second heat exchanger, a second heat storage system, a turbine and an air outlet device in series along the direction of working gas. The other mode is a heat supply and power supply mode, after the normal-temperature working medium is subjected to adiabatic compression by a compressor, isobaric heat absorption is carried out through a second heat storage system, then the working medium enters a turbine for adiabatic expansion to apply work to the outside, isobaric heat release is carried out through a first heat storage system, and finally the working medium is supplied and released to the outside as a heating source; in this process the net output work is used to power. The scheme solves the problems of wind abandonment and light abandonment in photovoltaic power generation and wind power generation and peak clipping and valley filling of peak-valley electricity, supplies heat while storing and supplying power, and recovers waste heat of waste gas in another heat storage system, thereby improving heat-power conversion efficiency.
However, the above technical solutions have the following drawbacks: the circulation mode of the normal-temperature working medium during energy storage (electricity storage) is as follows: compression-release of heat (via the second heat accumulator) -expansion work-heating-absorption of heat (via the first heat accumulator); the cycle mode when supplying power is: compression-absorption of heat (via the second heat accumulator) -expansion to do work-release of heat (via the first heat accumulator) -heating. In the energy storage circulation mode, if single-tank energy storage is adopted, full heat and cold cannot be completely stored; if double tanks are adopted for energy storage, the full heat and cold can be stored; in the power supply circulation mode, in order to maintain the temperature difference and the energy conversion efficiency of the second heat accumulator serving as a high-temperature heat source and the first heat accumulator serving as a low-temperature heat source, the temperature of the second heat accumulator needs to be increased, the compression ratio of the system is increased, the temperature of the high-temperature end of the system is also increased, and the requirement of the system on high-temperature resistant materials is increased; the system is open cycle, and is not suitable for use when the cycle working medium is helium, argon and other gases.
SUMMERY OF THE UTILITY MODEL
The utility model discloses aim at solving one of above-mentioned technical problem at least.
Therefore, the utility model aims to provide a multistage heat pump formula bijar fused salt energy storage power generation system, this system can realize the stable output of renewable energy power such as wind-powered electricity generation or photovoltaic power generation, has balanced electric power supply and demand effect, can realize extensive energy storage, and performance energy storage peak shaving advantage solves renewable energy storage problem.
In order to achieve the above object, the utility model provides a multi-stage heat pump type double-tank fused salt energy storage power generation system, include: the energy storage device comprises a high-temperature molten salt tank, a low-temperature molten salt tank, a high-temperature antifreezing solution tank and a low-temperature antifreezing solution tank, wherein heat energy is stored in the high-temperature molten salt tank in the form of high-temperature molten salt heat energy, and is stored in the low-temperature antifreezing solution tank in the form of low-temperature antifreezing solution heat energy; an energy conversion device comprising: the system comprises a compressor, a first heat pump, a low-temperature molten salt pump connected with the low-temperature molten salt tank, a high-temperature molten salt pump connected with the high-temperature molten salt tank, a turbine, a second heat pump, a high-temperature antifreezing liquid pump connected with the high-temperature antifreezing liquid tank, a low-temperature antifreezing liquid pump connected with the low-temperature antifreezing liquid tank, a first heat exchanger, a second heat exchanger and a generator, wherein a loop formed by one or more of the high-temperature molten salt tank, the low-temperature molten salt tank, the high-temperature antifreezing liquid tank, the low-temperature antifreezing liquid tank, the compressor, the first heat pump, the low-temperature molten salt pump, the high-temperature molten salt pump, the turbine, the second heat pump, the high-temperature antifreezing liquid pump, the low-temperature antifreezing liquid pump, the first heat exchanger, the second heat exchanger and the generator is selectively opened so as to.
In addition, according to the utility model discloses foretell two jar fused salt energy storage power generation systems of multistage heat pump formula can also have following additional technical characterstic:
in some examples, when electric energy is converted into heat energy, a loop formed by the compressor, the first heat pump, the turbine and the second heat pump is opened, the compressor is driven by electric power, the electric energy is converted into hot gaseous working media, the first heat pump is driven by the electric power, the hot gaseous working media heat the molten salt, the temperature of the molten salt is increased, the low-temperature molten salt pump drives the molten salt to flow out of the low-temperature molten salt tank and flow through the first heat pump, and the molten salt flows to the high-temperature molten salt tank after being heated, so that heat storage at the high-temperature end of the system is completed.
In some examples, the temperature of the hot gaseous working medium is reduced after flowing through the turbine, the second heat pump is driven by electricity, the cold gaseous working medium absorbs heat from the antifreeze solution, the temperature of the antifreeze solution is reduced, the antifreeze solution pump drives the antifreeze solution to flow out of the high-temperature antifreeze solution tank, the antifreeze solution flows through the second heat pump, and the antifreeze solution flows to the low-temperature antifreeze solution tank after releasing heat, so that heat storage at the low-temperature end of the system is completed.
In some examples, wherein the first heat pump transfers heat of the hot gaseous working medium into the molten salt, at a low temperature end of the first heat pump the heating working medium absorbs heat from the hot gaseous working medium by evaporation, at a high temperature end of the first heat pump the heating working medium releases heat to the low temperature molten salt by condensation, and the low temperature molten salt is converted into high temperature molten salt and flows to the high temperature molten salt tank.
In some examples, wherein the second heat pump transfers heat of the low-temperature antifreeze solution to the cold gas working medium, at a high temperature end of the second heat pump, the refrigerant releases heat to the cold gas working medium through condensation, at a low temperature end of the second heat pump, the refrigerant absorbs heat from the high-temperature antifreeze solution through evaporation, and the high-temperature antifreeze solution is converted into the low-temperature antifreeze solution and flows to the low-temperature antifreeze solution tank.
In some examples, when heat storage is completed, the high temperature molten salt tank is full, the low temperature molten salt tank is empty, the low temperature antifreeze tank is full, and the high temperature antifreeze tank is empty.
In some examples, when converting thermal energy into electric energy, the first heat pump and the second heat pump are turned off, the first heat exchanger and the second heat exchanger are turned on, and a loop consisting of the compressor, the first heat exchanger, the turbine and the second heat exchanger is turned on.
In some examples, the compressor applies work to compress the gaseous working medium, the high-temperature molten salt is driven by the high-temperature molten salt pump to flow out of the high-temperature molten salt tank, the high-temperature molten salt heats the gaseous working medium when flowing through the first heat exchanger, the high-temperature molten salt flows to the low-temperature molten salt tank after heat exchange to expand the gaseous working medium to apply work, the turbine is pushed to rotate to drive the generator to generate electricity, the hot gaseous working medium applies work, flows through the second heat exchanger, releases heat to the low-temperature antifreeze solution, the low-temperature antifreeze solution is driven by the low-temperature antifreeze solution pump to flow out of the low-temperature solution tank, and the low.
In some examples, when the discharge is complete, the high temperature molten salt tank is empty, the low temperature molten salt tank is full, the low temperature antifreeze tank is empty, and the high temperature antifreeze tank is full.
In some examples, the freezing point of the antifreeze is below 0 ℃ and the working temperature is-70 ℃ to 0 ℃.
According to the utility model discloses a multistage heat pump formula bivalve fused salt energy storage power generation system adopts the closed circulation, has the energy conversion efficiency height, adopts fused salt heat-retaining and antifreeze solution cold storage, two-stage heat pump heating/cold, the temperature difference of system high temperature end and low temperature end temperature is stable, safe and reliable, clean low-carbon's advantage, utilizes the same set of system to realize energy storage and electricity generation; the temperature difference of the heat-work cycle is improved by utilizing the two-stage heat pump, the total energy conversion efficiency of the system is improved, the compression ratio of each heat pump is reduced, and the equipment cost is reduced; by reducing the temperature of the low-temperature end of the system, the total energy conversion efficiency of the system is ensured, and the temperature of the high-temperature end of the system and the requirement on high-temperature resistant equipment are reduced; the system can stabilize the instability of power generation of renewable energy sources such as wind power generation or photovoltaic power generation, realize the stable output of the power of the renewable energy sources, relieve the problems of wind abandonment and light abandonment, peak regulation of a thermal power plant, off-peak power utilization and the like; the system is in closed circulation, realizes zero emission and has a wide working medium selection range.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a schematic structural diagram of a multi-stage heat pump type double-tank molten salt energy storage power generation system according to an embodiment of the present invention.
FIG. 2 is a schematic diagram of the structure and operating parameters of a multi-stage heat pump type double-tank molten salt energy storage power generation system during the compressed air energy storage cycle according to an embodiment of the present invention;
FIG. 3 is a graph of operating parameters of a multi-stage heat pump type dual-tank molten salt energy storage power generation system during a compressed air energy storage cycle, according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of the structure and operating parameters of a multi-stage heat pump type dual-tank molten salt energy storage power generation system during a turbine work cycle according to an embodiment of the present invention;
FIG. 5 is a graph of operating parameters of a multi-stage heat pump dual-tank molten salt energy storage power generation system during a turbine work cycle, according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of the structure and operating parameters of a multi-stage heat pump type dual-tank molten salt energy storage power generation system during a first heat pump cycle according to an embodiment of the present invention;
FIG. 7 is a graph of operating parameters of a multi-stage heat pump dual-tank molten salt energy storage power generation system during a first heat pump cycle, according to an embodiment of the present disclosure;
FIG. 8 is a schematic diagram of the structure and operating parameters of a multi-stage heat pump dual-tank molten salt energy storage power generation system during a second heat pump cycle according to an embodiment of the present invention;
fig. 9 is a graph of operating parameters of a multi-stage heat pump dual-tank molten salt energy storage power generation system during a second heat pump cycle, according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The following describes a multi-stage heat pump type double-tank molten salt energy storage power generation system according to an embodiment of the present invention with reference to the drawings.
Fig. 1 is a schematic structural diagram of a multi-stage heat pump type double-tank molten salt energy storage power generation system according to an embodiment of the present invention. The multi-stage heat pump type double-tank molten salt energy storage power generation system comprises an energy storage device (not shown in the figure) and an energy conversion device (not shown in the figure).
As shown in fig. 1, the energy storage device includes 4 heat-insulating tanks with high thermal insulation performance, specifically including a high-temperature molten salt tank 5, a low-temperature molten salt tank 3, a high-temperature antifreeze liquid tank 9, and a low-temperature antifreeze liquid tank 11, and heat energy is stored in the high-temperature molten salt tank 5 in the form of high-temperature molten salt heat energy and in the low-temperature antifreeze liquid tank 11 in the form of low-temperature antifreeze liquid heat energy. When heat storage is finished (namely electric energy is converted into heat energy), the high-temperature molten salt tank 5 is full, the low-temperature molten salt tank 3 is emptied, the low-temperature antifreeze liquid tank 11 is full, and the high-temperature antifreeze liquid tank 9 is emptied.
In one embodiment of the present invention, the antifreeze with freezing point lower than 0 ℃ is used as the low temperature end cold storage medium, the working temperature of the antifreeze is-70 ℃ to 0 ℃, and the antifreeze can be, but not limited to, ethanol water solution, ethylene glycol water solution, glycerol water solution, saline water solution (calcium chloride, magnesium chloride, sodium nitrate, sodium nitrite); the low-melting-point salt (nitrate and chloride) is used as a high-temperature-end heat storage medium, so that the risk of molten salt solidification and the requirement of a system on molten salt solidification prevention are reduced. The working temperature of the anti-freezing solution is reduced, so that the energy conversion efficiency of the system is ensured, the temperature of the high-temperature end of the system is reduced, and the requirement of the system on expensive high-temperature-resistant materials is reduced.
The energy conversion device utilizes electric energy to drive gaseous working medium circulation and two sets of heat pumps, and converts the electric energy into heat energy to be stored. The energy conversion device specifically includes: the system comprises a compressor 1, a first heat pump 2, a low-temperature molten salt pump 4 connected with a low-temperature molten salt tank 3, a high-temperature molten salt pump 6 connected with a high-temperature molten salt tank 5, a turbine 7, a second heat pump 8, a high-temperature antifreezing liquid pump 10 connected with a high-temperature antifreezing liquid tank 9, a low-temperature antifreezing liquid pump 12 connected with a low-temperature antifreezing liquid tank 11, a first heat exchanger 13, a second heat exchanger 14 and a generator 15.
Specifically, the electric energy is converted into the heat energy or the heat energy is converted into the electric energy by selectively opening a loop formed by one or more of the high-temperature molten salt tank 5, the low-temperature molten salt tank 3, the high-temperature antifreeze liquid tank 9, the low-temperature antifreeze liquid tank 11, the compressor 1, the first heat pump 2, the low-temperature molten salt pump 4, the high-temperature molten salt pump 6, the turbine 7, the second heat pump 8, the high-temperature antifreeze liquid pump 10, the low-temperature antifreeze liquid pump 12, the first heat exchanger 13, the second heat exchanger 14 and the generator 15.
In the heat storage stage (i.e. the stage of converting electric energy into heat energy), the gaseous working medium performs reverse circulation of Brayton cycle. The gaseous working medium can be air, nitrogen, helium, argon and hydrogen. When the electric energy is converted into the heat energy, a loop formed by the compressor 1, the first heat pump 2, the turbine 7 and the second heat pump 8 is opened, the compressor 1 is driven by electric power, and the electric energy is converted into the energy of the hot gaseous working medium; through electric drive first heat pump 2, hot gaseous working medium heating fused salt, fused salt temperature risees, and low temperature fused salt pump 4 drive fused salt flows out from low temperature fused salt jar 3, and first heat pump 2 flows through, and fused salt is heated the back and flows to high temperature fused salt jar 5, accomplishes the heat-retaining of system high temperature end.
Further, after the hot gaseous working medium flows through the turbine 7, the temperature is reduced, the second heat pump 8 is driven by electric power, the cold gaseous working medium absorbs heat from the antifreeze solution, the temperature of the antifreeze solution is reduced, the high-temperature antifreeze solution pump 10 drives the antifreeze solution to flow out of the high-temperature antifreeze solution tank 9 and flow through the second heat pump 8, and the antifreeze solution flows to the low-temperature antifreeze solution tank 11 after releasing heat, so that heat storage at the low-temperature end of the system is completed.
Wherein, first heat pump 2 transfers the heat of hot gaseous working medium to the fused salt, and at the low temperature end of first heat pump 2, the working medium that heats absorbs heat from hot gaseous working medium through the evaporation, and at the high temperature end of first heat pump 2, the working medium that heats is exothermic to low temperature fused salt through the condensation, and low temperature fused salt converts high temperature fused salt into, flows to high temperature fused salt jar 5.
The second heat pump 8 transfers the heat of the low-temperature antifreeze solution to the cold gas state working medium, the refrigeration working medium releases heat to the cold gas state working medium through condensation at the high-temperature end of the second heat pump 8, the refrigeration working medium absorbs heat from the high-temperature antifreeze solution through evaporation at the low-temperature end of the second heat pump 8, and the high-temperature antifreeze solution is converted into the low-temperature antifreeze solution and flows to the low-temperature antifreeze solution tank 11.
When the heat energy is converted into the electric energy (namely, in the power generation stage), the first heat pump 2 and the second heat pump 8 are closed through corresponding valves, the first heat exchanger 13 and the second heat exchanger 14 are opened, and a loop formed by the compressor 1, the first heat exchanger 13, the turbine 7 and the second heat exchanger 14 is opened to start the power cycle of the heat-electricity conversion, wherein the process is the reverse process of the electricity-heat conversion and can be simplified into a constant-pressure heating work-applying cycle.
The compressor 1 applies work to compress a gaseous working medium, the high-temperature molten salt is driven by the high-temperature molten salt pump 6 to flow out of the high-temperature molten salt tank 5, the high-temperature molten salt heats the gaseous working medium when flowing through the first heat exchanger 13, the gaseous working medium flows to the low-temperature molten salt tank 3 after heat exchange to expand the hot gaseous working medium to apply work, the turbine 7 is pushed to rotate to drive the generator 15 to generate electricity, the hot gaseous working medium applies work, flows through the second heat exchanger 14 to release heat to the low-temperature antifreeze liquid, the low-temperature antifreeze liquid is driven by the low-temperature antifreeze liquid pump 12 to flow out of the low-temperature antifreeze liquid tank 11, and flows to.
When the discharge is finished (namely, the conversion of the heat energy into the electric energy is finished), the high-temperature molten salt tank 5 is emptied, the low-temperature molten salt tank 3 is full, the low-temperature antifreeze solution tank 11 is emptied, and the high-temperature antifreeze solution tank 9 is full. Further, the system may begin the next energy storage and generation cycle.
As a specific embodiment, the structure and the operation parameters of the multi-stage heat pump type double-tank molten salt energy storage power generation system in the compressed air energy storage cycle are exemplarily shown in FIG. 2. FIG. 3 shows an exemplary operating parameter curve of the multi-stage heat pump type double-tank molten salt energy storage power generation system during a compressed air energy storage cycle. Fig. 4 exemplarily shows the structure and the operation parameters of the multi-stage heat pump type double-tank molten salt energy storage power generation system in the working cycle of the turbine. FIG. 5 exemplarily shows an operation parameter curve of the multi-stage heat pump type double-tank molten salt energy storage power generation system in a turbine work cycle. FIG. 6 shows the structure and operation parameters of the multi-stage heat pump type double-tank molten salt energy storage power generation system in the first heat pump cycle. FIG. 7 illustrates an operating parameter curve of the multi-stage heat pump type two-tank molten salt energy storage and generation system during a first heat pump cycle. FIG. 8 shows the structure and operation parameters of the multi-stage heat pump type double-tank molten salt energy storage power generation system during the second heat pump cycle. FIG. 9 exemplarily illustrates an operating parameter curve of the multi-stage heat pump type two-tank molten salt energy storage and power generation system in the second heat pump cycle.
As a specific example, table 1 shows exemplary values of the main operating parameters.
TABLE 1
To sum up, in the multi-stage heat pump type double-tank fused salt energy storage power generation system of the utility model, in the heat storage stage, the gaseous working medium is subjected to the cycle of compression-heat release-expansion work-heat absorption, the outside inputs electric energy to the system, the gaseous working medium absorbs heat from the antifreeze solution and releases heat to the fused salt through the heat pump, and the hot gaseous working medium is used as a low-grade heat source to heat the fused salt through the first heat pump; and refrigerating the antifreeze liquid by the cold gas working medium through a second heat pump. Through the combined operation of gaseous working medium circulation and two sets of heat pumps, the heat pump compression ratio is reduced, the heat pump type double-tank molten salt energy storage power generation system stores heat in a high-temperature molten salt tank and stores cold in a low-temperature antifreezing solution tank, heat is transferred to a high-temperature heat source from a low-temperature heat source of the system, the temperature difference between the high-temperature end and the low-temperature end of the whole system is effectively improved, and therefore the heat storage power generation efficiency of the system is improved. In the power generation stage, the gaseous working medium is subjected to a constant pressure heating work-applying cycle process: the system outputs electric energy to the outside, the gaseous working medium absorbs heat from the molten salt through the heat exchanger and releases heat to the antifreeze, the turbine does work more than the compressor to drive the generator to generate electricity, and the system outputs the electric energy to the outside. Because the temperature difference between the high-temperature end and the low-temperature end of the whole system is increased in the energy storage stage, the heat storage and power generation efficiency of the system is improved.
The system adopts a main device of gaseous working medium circulation consisting of a compressor, a heat pump, a heat exchanger, a turbine, a heat pump and a heat exchanger, and realizes heat storage and power generation by using the same system through reciprocal electricity-heat conversion circulation and heat-electricity conversion circulation by using the same system, thereby simplifying the system and reducing the cost.
The system adopts low-melting-point molten salt as a high-temperature-end heat storage medium, adopts antifreeze with a lower freezing point as a low-temperature-end heat storage medium, and adopts a gaseous working medium as a heat storage and power generation circulating working medium. The fused salt is low-melting-point salt, and the risk of fused salt solidification and the requirement of a system on fused salt solidification prevention are reduced. The working temperature of the antifreeze is reduced, so that the energy conversion efficiency of the system is ensured, the temperature of the high-temperature end of the heat pump type double-tank molten salt energy storage power generation system is reduced, the requirements of the system on expensive high-temperature-resistant equipment and materials are reduced, and the system cost is reduced. Furthermore, the gaseous working medium is in closed circulation in the heat storage and power generation stages, no emission and no pollution are caused, and a clean, low-carbon, efficient and energy-saving energy storage mode is realized.
The system adopts the modes that the high-temperature molten salt tank, the low-temperature molten salt tank, the high-temperature antifreezing liquid tank and the low-temperature antifreezing liquid tank store heat and store cold respectively, avoids the mixing of a high-temperature energy storage medium and a low-temperature energy storage medium, effectively maintains the temperature constancy of a high-temperature end and a low-temperature end, maintains the temperature difference of the high-temperature end and the low-temperature end of the system, and ensures the efficiency of heat storage and power generation of the system. The system provides an energy storage mode which is generally suitable for thermal power peak regulation, stabilization of instability of power generation of renewable energy sources such as wind power or photovoltaic power generation and the like, peak shifting valley filling, and alleviation of problems of wind abandonment, light abandonment and the like.
In other words, the system is a closed cycle energy storage and power generation system which is based on the heat storage of the molten salt and the cold storage of the anti-freezing solution, utilizes a two-stage heat pump to heat the molten salt and refrigerate the anti-freezing solution, and adopts a turbine and a compressor to do work to generate power, and is suitable for the fields of peak regulation of a thermal power plant, renewable energy storage of wind power, photovoltaic and the like, utilization of off-peak electricity and the like. Aiming at the characteristics of instability and intermittence of renewable energy sources, the energy storage power generation system can stabilize the instability of power generation of the renewable energy sources such as wind power generation or photovoltaic power generation and the like, realize stable output of the renewable energy source power, has the effect of balancing power supply and demand, can realize large-scale energy storage, exerts the advantages of energy storage and peak regulation, and solves the problem of energy storage of the renewable energy sources. The system adopts two stages of heat pumps to increase the temperature of the high-temperature end of the system and reduce the temperature of the low-temperature end of the system, thereby reducing the compression ratio of each stage of heat pump; by adopting the mode of reducing the temperature of the low-temperature end of the system, the lower temperature of the high-temperature end of the system is realized while the energy conversion efficiency is ensured, and the requirement of the system on high-temperature resistant materials is reduced; the system is in closed circulation, zero emission is realized, and the working medium selection range is wide.
The working principle of the system can be summarized as follows: the method is characterized in that molten salt is used as a high-temperature end heat storage medium, an antifreezing solution is used as a low-temperature end heat storage medium, and a gaseous working medium is used as a heat storage and power generation circulating working medium. In the heat storage stage, the gaseous working medium performs a cycle process of compression, heat release (through a first heat pump), expansion work and heat absorption (through a second heat pump), the gaseous working medium absorbs heat from the antifreeze and releases heat to the molten salt, the hot gaseous working medium serves as a low-grade heat source and heats the molten salt through the first heat pump, and the low-temperature molten salt exchanges heat and then flows to a high-temperature molten salt tank for storage; and the cold gas working medium cools the antifreeze through the second heat pump to refrigerate the antifreeze, and the high-temperature antifreeze flows to the low-temperature antifreeze tank to be stored after heat exchange. High-temperature heat is stored in the high-temperature molten salt tank; the low-temperature heat is stored in the low-temperature antifreeze liquid tank. In the stage, the total work of the compressor work and the heat pump work is greater than the work of the turbine, and the outside inputs electric energy to the system; in the power generation stage, the gaseous working medium is subjected to a constant pressure heating work-applying cycle process: the system comprises a compressor, a gas working medium, a gas heat exchanger, a first heat exchanger, a second heat exchanger, a gas working medium, a turbine, a power generator and a power supply system, wherein the gas working medium absorbs heat from molten salt and releases heat to an antifreezing solution, the turbine does work more than the compressor to drive the power generator to generate power, and the system outputs power to the outside in a net.
According to the multi-stage heat pump type double-tank fused salt energy storage power generation system provided by the embodiment of the utility model, the closed circulation is adopted, the advantages of high energy conversion efficiency, adoption of fused salt heat storage and antifreeze liquid for cold storage, two-stage heat pump heating/cooling, stable temperature and temperature difference of the high temperature end and the low temperature end of the system, safety, reliability and clean low carbon are achieved, and energy storage and power generation are realized by using the same set of system; the temperature difference of the heat-work cycle is improved by utilizing the two-stage heat pump, the total energy conversion efficiency of the system is improved, the compression ratio of each heat pump is reduced, and the equipment cost is reduced; by reducing the temperature of the low-temperature end of the system, the total energy conversion efficiency of the system is ensured, and the temperature of the high-temperature end of the system and the requirement on high-temperature resistant equipment are reduced; the system can stabilize the instability of power generation of renewable energy sources such as wind power generation or photovoltaic power generation, realize the stable output of the power of the renewable energy sources, relieve the problems of wind abandonment and light abandonment, peak regulation of a thermal power plant, off-peak power utilization and the like; the system is in closed circulation, realizes zero emission and has a wide working medium selection range.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (2)
1. The utility model provides a multi-stage heat pump formula bijar fused salt energy storage power generation system which characterized in that includes:
the energy storage device comprises a high-temperature molten salt tank, a low-temperature molten salt tank, a high-temperature antifreezing solution tank and a low-temperature antifreezing solution tank, wherein heat energy is stored in the high-temperature molten salt tank in the form of high-temperature molten salt heat energy, and is stored in the low-temperature antifreezing solution tank in the form of low-temperature antifreezing solution heat energy;
an energy conversion device comprising: a compressor, a first heat pump, a low-temperature molten salt pump connected with the low-temperature molten salt tank, a high-temperature molten salt pump connected with the high-temperature molten salt tank, a turbine, a second heat pump, a high-temperature antifreezing liquid pump connected with the high-temperature antifreezing liquid tank, a low-temperature antifreezing liquid pump connected with the low-temperature antifreezing liquid tank, a first heat exchanger, a second heat exchanger and a generator, wherein,
the electric energy is converted into heat energy or the heat energy is converted into the electric energy by selectively opening a loop formed by one or more of the high-temperature molten salt tank, the low-temperature molten salt tank, the high-temperature antifreeze liquid tank, the low-temperature antifreeze liquid tank, the compressor, the first heat pump, the low-temperature molten salt pump, the high-temperature molten salt pump, the turbine, the second heat pump, the high-temperature antifreeze liquid pump, the low-temperature antifreeze liquid pump, the first heat exchanger, the second heat exchanger and the generator.
2. The multi-stage heat pump type double-tank molten salt energy storage power generation system of claim 1, wherein a freezing point of the anti-freezing solution is below 0 ℃ and an operating temperature is-70 ℃ to 0 ℃.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110159379A (en) * | 2019-06-14 | 2019-08-23 | 国家电投集团科学技术研究院有限公司 | The double tank molten salt energy-storage electricity generation systems of Multi-stage heat pump type |
| CN112524841A (en) * | 2020-11-30 | 2021-03-19 | 上海发电设备成套设计研究院有限责任公司 | Heat pump energy storage system |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110159379A (en) * | 2019-06-14 | 2019-08-23 | 国家电投集团科学技术研究院有限公司 | The double tank molten salt energy-storage electricity generation systems of Multi-stage heat pump type |
| CN110159379B (en) * | 2019-06-14 | 2024-01-09 | 国家电投集团科学技术研究院有限公司 | Multistage heat pump type double-tank molten salt energy storage power generation system |
| CN112524841A (en) * | 2020-11-30 | 2021-03-19 | 上海发电设备成套设计研究院有限责任公司 | Heat pump energy storage system |
| CN112524841B (en) * | 2020-11-30 | 2022-08-30 | 上海发电设备成套设计研究院有限责任公司 | Heat pump energy storage system |
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