阅读说明：本技术 一种耦合卡琳娜循环的液态二氧化碳储能系统及方法 (Liquid carbon dioxide energy storage system and method coupled with kalina cycle ) 是由 刘展 刘旭 孙文旭 于 2020-12-16 设计创作，主要内容包括：本发明公开了一种耦合卡琳娜循环的液态二氧化碳储能系统及方法,可回收蓄热介质余热、充分利用蓄热介质的储热潜力、减少卡琳娜循环中涡轮叶片的腐蚀、减少卡琳娜循环中贫氨溶液中势能消散；所述系统结合了创新的卡琳娜循环,解决了基本卡琳娜循环中涡轮叶片腐蚀以及贫氨溶液势能浪费问题,通过高温液态二氧化碳储能系统耦合卡琳娜循环,安全有效的利用蓄热介质余热,提高了能量的利用率；在蓄热介质热储罐前增加了电加热器,使蓄热介质的蓄热潜力得到了充分利用。(The invention discloses a liquid carbon dioxide energy storage system and method coupled with a kalina cycle, which can recover the waste heat of a heat storage medium, fully utilize the heat storage potential of the heat storage medium, reduce the corrosion of turbine blades in the kalina cycle and reduce the potential energy dissipation in a poor ammonia solution in the kalina cycle; the system combines an innovative kalina cycle, solves the problems of turbine blade corrosion and poor ammonia solution potential energy waste in the basic kalina cycle, and safely and effectively utilizes the waste heat of the heat storage medium by coupling the high-temperature liquid carbon dioxide energy storage system with the kalina cycle, thereby improving the utilization rate of energy; an electric heater is added in front of the heat storage medium heat storage tank, so that the heat storage potential of the heat storage medium is fully utilized.)

1. A coupling kalina endless liquid carbon dioxide energy storage system which characterized in that includes: the system comprises a carbon dioxide turbine (1), a preheater (2), a kalina turbine (3), an ejector (4), a superheater (5), a heat regenerator (6), an ammonia water separator (7), an ammonia water steam generator (8), a precooler (9), a carbon dioxide sub-compressor (10), a carbon dioxide separator (12), a low-pressure liquid carbon dioxide storage tank (13), a high-pressure liquid carbon dioxide storage tank (14), a cold water tank (15), a carbon dioxide evaporator (16), an internal heat exchanger (18), a condenser (19), an after-cooler (20), a carbon dioxide compressor (21), an electric heater (22) and a hot water tank (23);

an outlet of the low-pressure liquid carbon dioxide storage tank (13) is sequentially communicated with a cold side pipeline of a carbon dioxide evaporator (16), a cold side pipeline of an internal heat exchanger (18), a carbon dioxide compressor (21), a hot side pipeline of an after-cooler (20), a hot side pipeline of the internal heat exchanger (18) and an inlet of a high-pressure liquid carbon dioxide storage tank (14) through pipelines;

an outlet of the high-pressure liquid carbon dioxide storage tank (14) is sequentially communicated with a cold side pipeline of the heat regenerator (6), a cold side pipeline of the preheater (2), the carbon dioxide turbine (1), a hot side pipeline of the heat regenerator (6), a hot side pipeline of the precooler (9) and an inlet of the carbon dioxide separator (12) through pipelines; a first outlet of the carbon dioxide separator (12) is sequentially communicated with inlets of the carbon dioxide sub-compressor (10) and a hot side pipeline of the precooler (9) through pipelines; the second outlet of the carbon dioxide separator (12) is communicated with the inlet of a low-pressure liquid carbon dioxide storage tank (13) through a pipeline;

an outlet of the cold water tank (15) is sequentially communicated with inlets of a hot side pipeline of the aftercooler (20), the electric heater (22), the hot water tank (23) and a hot side pipeline of the preheater (2) through pipelines;

an inlet of a hot side pipeline of the superheater (5) is communicated with an outlet of a hot side pipeline of the preheater (2); an outlet of a hot side pipeline of the superheater (5) is sequentially communicated with a hot side pipeline of the ammonia water steam generator (8) and an inlet of the cold water tank (15) through pipelines; an outlet of a cold side pipeline of the ammonia water steam generator (8) is communicated with an inlet of the ammonia water separator (7) through a pipeline; a first outlet of the ammonia water separator (7) is sequentially communicated with a cold side pipeline of the superheater (5), the kalina turbine and a first inlet of the ejector (4) through pipelines; a second outlet of the ammonia water separator (7) is communicated with a second inlet of the ejector (4); the outlet of the ejector (4) is communicated with the inlet of a hot side pipeline of the condenser (19) through a pipeline; the outlet of the hot side pipeline of the condenser (19) is communicated with the inlet of the cold side pipeline of the ammonia water steam generator (8).

2. The liquid carbon dioxide energy storage system coupled with the kalina cycle of claim 1, further comprising:

a pressure reducing throttle valve (11), the pressure reducing throttle valve (11) being disposed between the precooler (9) and the carbon dioxide separator (12).

3. The liquid carbon dioxide energy storage system coupled with the kalina cycle as claimed in claim 1, wherein the carbon dioxide compressor (21) and the carbon dioxide sub-compressor (10) are both in transmission connection with an electric motor.

4. The liquid carbon dioxide energy storage system coupled with the kalina cycle is characterized in that an ammonia water pump (17) is arranged between an outlet of a hot side pipeline of the condenser (19) and an inlet of a cold side pipeline of the ammonia water steam generator (8).

5. A liquid carbon dioxide energy storage system coupled with a kalina cycle according to claim 4, characterized in that the ammonia pump (17) is driven by an electric motor.

6. The liquid carbon dioxide energy storage system coupled with the kalina cycle as claimed in claim 1, wherein the carbon dioxide turbine (1) and the kalina turbine (3) are both in transmission connection with a generator.

7. The liquid carbon dioxide energy storage system coupled with the kalina cycle as claimed in claim 1, wherein a hot side pipeline of the carbon dioxide evaporator (16) is used for leading into a circulating water tower.

8. The liquid carbon dioxide energy storage system coupled with the kalina cycle as claimed in claim 1, wherein a cold side pipeline of the condenser (19) is used for leading into a circulating water tower.

9. A liquid carbon dioxide energy storage method coupled with a kalina cycle is characterized in that the liquid carbon dioxide energy storage system based on claim 1 comprises the following steps:

in the energy storage process, liquid carbon dioxide stored in a low-pressure liquid carbon dioxide storage tank (13) flows through a carbon dioxide evaporator (16) to absorb heat to become saturated steam, the liquid carbon dioxide flows through an internal heat exchanger (18) to absorb the compression heat of the compressed carbon dioxide to become high-pressure supercritical carbon dioxide, the high-pressure supercritical carbon dioxide enters a carbon dioxide compressor (21) through a pipeline, the compressed supercritical carbon dioxide flows through an aftercooler (20) to exchange heat with cold water from a cold water tank (15), cold energy in the cold water is absorbed, the temperature is reduced, the supercritical carbon dioxide flowing through the aftercooler (20) is condensed through the internal heat exchanger (18) to become a high-pressure liquid state, and the high-pressure liquid carbon dioxide is stored in a high-pressure liquid carbon dioxide storage tank (; wherein, carbon dioxide is compressed to generate compression heat, ambient water is discharged from the cold water tank (15), the compression heat is absorbed in the aftercooler (20), and the obtained compression heat water is conveyed to the electric heater (22) for heating and conveyed to the hot water tank (23) for storage;

in the energy release process, liquid carbon dioxide stored in a high-pressure liquid carbon dioxide storage tank (14) flows through a heat regenerator (6) to absorb the residual heat of the residual high-temperature carbon dioxide at the outlet of the turbine and is changed into supercritical carbon dioxide; the exhaust gas of the turbine is subjected to heat exchange through a heat regenerator (6) and then is mixed with a secondary flow from a carbon dioxide sub-compressor (10) as a primary flow, the mixed flow is cooled by ambient water in a precooler (9), the cooled mixed flow flows through a carbon dioxide separator (12), the gas flows to the carbon dioxide sub-compressor (10) through a first outlet of the carbon dioxide separator (12), and the liquid flows out of a second outlet of the carbon dioxide separator (12) and is stored in a low-pressure liquid carbon dioxide storage tank (13); hot water stored in the hot water tank (23) is discharged into the preheater (2) to transfer heat to carbon dioxide, the hot water flowing through the preheater (2) is conveyed to a kalina cycle to recover the heat, and cold water flowing out of the kalina cycle is stored in the cold water tank (15);

in the kalina cycle process, the ammonia water solution absorbs the waste heat in the heat storage medium from the superheater (5) in the ammonia water steam generator (8) to generate a two-phase mixture, the two-phase mixture is separated in the ammonia water separator (7), the saturated ammonia-rich steam flows out from a first outlet of the ammonia water separator (7) and is conveyed to the superheater (5) to absorb the waste heat in the heat storage medium from the preheater (2), and the saturated ammonia-rich steam after heat absorption enters the kalina turbine (3) to be expanded for power generation; saturated poor ammonia liquid enters the ejector (4) through a second outlet of the ammonia water separator (7) and is used as a primary flow to absorb the kalina turbine exhaust gas, a two-phase mixture is formed on the back of the ejector (4), the two-phase mixture flows through the condenser (19) to be condensed, and the condensed liquid is conveyed to the ammonia water steam generator (8) to be circulated for the next round.

Technical Field

The invention belongs to the technical field of energy storage, and particularly relates to a liquid carbon dioxide energy storage system and method coupled with kalina circulation.

Background

With the continuous development and progress of science and technology, energy becomes a main factor for restricting the development of the human society. With the excessive consumption of fossil fuels such as coal and the environmental pollution problem caused by the use of fossil fuels, the development and utilization of renewable energy sources are increasingly regarded by people. However, the renewable energy has the characteristics of high intermittency, randomness and the like, and a proper energy storage system needs to be selected to realize the stable output of the renewable energy power generation.

The liquid carbon dioxide energy storage is a novel energy storage technology, the energy storage system takes carbon dioxide as a working medium, and during energy storage, the electric power generated by renewable energy sources is used for pushing a compressor to compress the carbon dioxide, storing energy and recovering compression heat in the compression process; when releasing energy, the stored high-pressure carbon dioxide is heated, so that the stored high-pressure carbon dioxide does work in the expansion machine to release energy. However, the existing liquid carbon dioxide energy storage system has the defects of incapability of storing high-frequency fluctuation renewable energy, low energy density and complex turbine exhaust liquefaction device.

In summary, a new liquid carbon dioxide energy storage system and method are needed.

Disclosure of Invention

The invention aims to provide a liquid carbon dioxide energy storage system and a liquid carbon dioxide energy storage method coupled with kalina circulation, so as to solve one or more technical problems. The electric heater is adopted to improve the temperature of the heat storage medium by utilizing high-frequency fluctuation renewable electric energy, so that the energy density of the energy storage system is increased; turbine exhaust is liquefied by adopting self-condensation circulation, and the traditional heavy and complex packed bed type cold accumulator is removed.

In order to achieve the purpose, the invention adopts the following technical scheme:

the invention relates to a liquid carbon dioxide energy storage system coupled with kalina circulation, which comprises: the system comprises a carbon dioxide turbine, a preheater, a kalina turbine, an ejector, a superheater, a heat regenerator, an ammonia water separator, an ammonia water steam generator, a precooler, a carbon dioxide sub-compressor, a carbon dioxide separator, a low-pressure liquid carbon dioxide storage tank, a high-pressure liquid carbon dioxide storage tank, a cold water tank, a carbon dioxide evaporator, an internal heat exchanger, a condenser, an aftercooler, a carbon dioxide compressor, an electric heater and a hot water tank; an outlet of the low-pressure liquid carbon dioxide storage tank is sequentially communicated with a cold side pipeline of the carbon dioxide evaporator, a cold side pipeline of the internal heat exchanger, a carbon dioxide compressor, a hot side pipeline of the after-cooler, a hot side pipeline of the internal heat exchanger and an inlet of the high-pressure liquid carbon dioxide storage tank through pipelines; an outlet of the high-pressure liquid carbon dioxide storage tank is sequentially communicated with a cold side pipeline of the heat regenerator, a cold side pipeline of the preheater, the carbon dioxide turbine, a hot side pipeline of the heat regenerator, a hot side pipeline of the precooler and an inlet of the carbon dioxide separator through pipelines; the first outlet of the carbon dioxide separator is sequentially communicated with the carbon dioxide sub-compressor and the inlet of the hot side pipeline of the precooler through pipelines; the second outlet of the carbon dioxide separator is communicated with the inlet of the low-pressure liquid carbon dioxide storage tank through a pipeline; the outlet of the cold water tank is sequentially communicated with the hot side pipeline of the aftercooler, the electric heater, the hot water tank and the inlet of the hot side pipeline of the preheater through pipelines; an inlet of a hot side pipeline of the superheater is communicated with an outlet of a hot side pipeline of the preheater; the outlet of the hot side pipeline of the superheater is sequentially communicated with the hot side pipeline of the ammonia water steam generator and the inlet of the cold water tank through pipelines; an outlet of a cold side pipeline of the ammonia water steam generator is communicated with an inlet of the ammonia water separator through a pipeline; a first outlet of the ammonia water separator is sequentially communicated with a cold side pipeline of the superheater, the kalina turbine and a first inlet of the ejector through pipelines; the second outlet of the ammonia water separator is communicated with the second inlet of the ejector; the outlet of the ejector is communicated with the inlet of the hot side pipeline of the condenser through a pipeline; the outlet of the hot side pipeline of the condenser is communicated with the inlet of the cold side pipeline of the ammonia water steam generator.

The invention further improves the method and also comprises the following steps: a pressure reducing throttle valve disposed between the precooler and the carbon dioxide separator.

The invention is further improved in that the carbon dioxide compressor and the carbon dioxide sub-compressor are both in transmission connection with an electric motor.

The invention is further improved in that an ammonia water pump is arranged between the outlet of the hot side pipeline of the condenser and the inlet of the cold side pipeline of the ammonia water steam generator.

A further development of the invention is that the ammonia pump is driven by an electric motor.

The invention is further improved in that the carbon dioxide turbine and the kalina turbine are both in transmission connection with a generator.

In a further development of the invention, the hot-side line of the carbon dioxide evaporator is used for feeding into the circulating water tower.

A further development of the invention is that the cold-side line of the condenser is used for passing into the circulating water column.

The invention relates to a liquid carbon dioxide energy storage method coupled with kalina circulation, which is based on the liquid carbon dioxide energy storage system and comprises the following steps:

in the energy storage process, liquid carbon dioxide stored in a low-pressure liquid carbon dioxide storage tank flows through a carbon dioxide evaporator to absorb heat and turns into saturated steam, the compressed heat of the compressed carbon dioxide is absorbed by an internal heat exchanger and turns into high-pressure supercritical carbon dioxide, the high-pressure supercritical carbon dioxide enters a carbon dioxide compressor through a pipeline, the compressed supercritical carbon dioxide flows through an aftercooler to exchange heat with cold water from a cold water tank, cold energy in the cold water is absorbed, the temperature is reduced, and the supercritical carbon dioxide flowing through the aftercooler is condensed by the internal heat exchanger and turns into a high-pressure liquid state to be stored in the high-pressure liquid carbon dioxide storage tank; wherein, carbon dioxide is compressed to generate compression heat, ambient water is discharged from the cold water tank, the compression heat is absorbed in the aftercooler, and the water with the compression heat is conveyed to the electric heater for heating and conveyed to the hot water tank for storage;

in the energy release process, liquid carbon dioxide stored in a high-pressure liquid carbon dioxide storage tank flows through a heat regenerator to absorb the residual heat of the residual high-temperature carbon dioxide at the outlet of the turbine and is changed into supercritical carbon dioxide; the exhaust gas of the turbine is subjected to heat exchange through a heat regenerator and then is used as a primary flow to be mixed with a secondary flow from a carbon dioxide sub-compressor, the mixed flow is cooled by ambient water in a precooler, the cooled mixed flow flows through a carbon dioxide separator, the gas flows to the carbon dioxide sub-compressor through a first outlet of the carbon dioxide separator, and the liquid flows out of a second outlet of the carbon dioxide separator and is stored in a low-pressure liquid carbon dioxide storage tank; the hot water stored in the hot water tank is discharged into the preheater to transfer heat to the carbon dioxide, the hot water flowing through the preheater is conveyed to the kalina cycle to recover the heat, and the cold water flowing out of the kalina cycle is stored in the cold water tank;

in the kalina cycle process, the ammonia water solution absorbs the waste heat in the heat storage medium from the superheater in the ammonia water steam generator to generate a two-phase mixture, the two-phase mixture is separated in the ammonia water separator, the saturated ammonia-rich steam flows out from a first outlet of the ammonia water separator and is conveyed into the superheater to absorb the waste heat in the heat storage medium from the preheater, and the saturated ammonia-rich steam after heat absorption enters a kalina turbine to be expanded and generate power; and the saturated poor ammonia liquid enters the ejector through a second outlet of the ammonia water separator to be used as a primary flow to absorb the kalina turbine exhaust, a two-phase mixture is formed on the back of the ejector, the two-phase mixture flows through the condenser to be condensed, and the condensed liquid is conveyed to the ammonia water steam generator to be circulated for the next round.

Compared with the prior art, the invention has the following beneficial effects:

according to the liquid carbon dioxide energy storage system, during energy storage, the electric heater is used for further improving the temperature of the heat storage medium by utilizing high-frequency fluctuation renewable electric energy, so that the energy density of the energy storage system is increased; the self-condensation circulation is adopted to liquefy the turbine exhaust, so that the traditional heavy and complex packed bed type cold accumulator is removed; the carbon dioxide before compression and the compressed carbon dioxide exchange heat in an internal heat exchanger; the electric heater converts electric energy generated by low-quality high-frequency renewable energy sources into heat energy for storage. In the energy releasing process, a large amount of low-grade waste heat remains in the heat storage medium after the carbon dioxide is heated, and if the waste heat in the heat storage medium can be utilized, the utilization efficiency of energy can be greatly improved; kalina Cycle (Kalina Cycle) is a power Cycle system which effectively utilizes low-grade heat sources; however, in the traditional basic kalina cycle, saturated ammonia-rich steam directly expands through the turbine 3 to form gas-liquid two-phase mixed flow inside the turbine, which can seriously corrode turbine blades; and the high pressure ammonia-lean solution is throttled to an exhaust pressure, during which potential energy in the ammonia-lean solution is lost. The saturated ammonia-rich steam is further heated by the superheater, so that the fluid in the turbine is always in a gas state; the ejector is adopted to reduce the pressure of turbine exhaust by utilizing the pressure energy of the high-pressure ammonia-poor solution, increase the expansion ratio and further increase the output work of the system.

Specifically, the electric heater device is added in front of the hot water tank, so that the storage temperature of the heat storage medium is improved, and the heat storage potential of the heat storage medium is fully utilized. On the basis of a basic liquid carbon dioxide energy storage system, a condensation cycle is introduced between the turbine and the low-pressure liquid carbon dioxide storage tank, so that the problem that carbon dioxide at the outlet of the turbine of the traditional liquid carbon dioxide energy storage system is difficult to condense is solved. According to the invention, the high-temperature liquid carbon dioxide energy storage system is circularly coupled with the kalina, so that the waste heat of the heat storage medium is safely and effectively utilized, and the utilization rate of energy is improved. And compared with the basic kalina cycle, the inventive improvement of the invention comprises: a superheater is added before the ammonia water turbine to ensure dry expansion of the ammonia-rich steam in the turbine and reduce corrosion to the turbine; the ejector is used for replacing a throttle valve, so that the pressure difference of the ammonia water turbine is increased, and the output power of the ammonia water turbine is improved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art are briefly introduced below; it is obvious that the drawings in the following description are some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.

FIG. 1 is a schematic diagram of a liquid carbon dioxide energy storage system coupled to a kalina cycle in accordance with an embodiment of the present invention;

in the figure, 1, a carbon dioxide turbine; 2. a preheater; 3. a kalina turbine; 4. an ejector; 5. a superheater; 6. a heat regenerator; 7. an ammonia water separator; 8. an ammonia water vapor generator; 9. a precooler; 10. a carbon dioxide sub-compressor; 11. a pressure reducing throttle valve; 12. a carbon dioxide separator; 13. a low pressure liquid carbon dioxide storage tank; 14. a high pressure liquid carbon dioxide storage tank; 15. a cold water tank; 16. a carbon dioxide evaporator; 17. an ammonia pump; 18. an internal heat exchanger; 19. a condenser; 20. an aftercooler; 21. a carbon dioxide compressor; 22. an electric heater; 23. a hot water tank.

Detailed Description

In order to make the purpose, technical effect and technical solution of the embodiments of the present invention clearer, the following clearly and completely describes the technical solution of the embodiments of the present invention with reference to the drawings in the embodiments of the present invention; it is to be understood that the described embodiments are only some of the embodiments of the present invention. Other embodiments, which can be derived by one of ordinary skill in the art from the disclosed embodiments without inventive faculty, are intended to be within the scope of the invention.

Referring to fig. 1, a liquid carbon dioxide energy storage system coupled to kalina cycle according to an embodiment of the present invention includes: the system comprises a carbon dioxide turbine 1, a preheater 2, a kalina turbine 3, an ejector 4, a superheater 5, a heat regenerator 6, an ammonia water separator 7, an ammonia water steam generator 8, a precooler 9, a carbon dioxide sub-compressor 10, a decompression throttle valve 11, a carbon dioxide separator 12, a low-pressure liquid carbon dioxide storage tank 13, a high-pressure liquid carbon dioxide storage tank 14, a cold water tank 15, a carbon dioxide evaporator 16, an ammonia water pump 17, an internal heat exchanger 18, a condenser 19, an aftercooler 20, a carbon dioxide compressor 21, an electric heater 22 and a hot water tank 23.

The high-temperature liquid carbon dioxide energy storage system based on the heat storage medium waste heat utilization and coupled kalina cycle can be divided into three functional modules, namely a high-temperature liquid carbon dioxide energy storage and release unit, a heat energy storage and utilization unit and a kalina cycle unit.

In an embodiment of the present invention, the high temperature liquid carbon dioxide energy storage and release unit includes: the system comprises a low-pressure liquid carbon dioxide storage tank 13, a carbon dioxide evaporator 16, an internal heat exchanger 18, a carbon dioxide compressor 21, an aftercooler 20, a high-pressure liquid carbon dioxide storage tank 14, a heat regenerator 6, a preheater 2, a carbon dioxide turbine 1, a precooler 9, a carbon dioxide separator 12, a carbon dioxide son compressor 10 and the low-pressure liquid carbon dioxide storage tank 13 which are sequentially connected through pipelines; wherein, the outlet of the low-pressure liquid carbon dioxide storage tank 13 is connected with the cold side inlet of the carbon dioxide evaporator 16, the cold side outlet of the carbon dioxide evaporator 16 is connected with the cold side inlet of the internal heat exchanger 18, the cold side outlet of the internal heat exchanger 18 is connected with the inlet of the carbon dioxide compressor 21, the outlet of the carbon dioxide compressor 21 is connected with the hot side pipeline inlet of the aftercooler 20, the hot side pipeline outlet of the aftercooler 20 is connected with the hot side pipeline inlet of the internal heat exchanger 18, the hot side pipeline outlet of the internal heat exchanger 18 is connected with the inlet of the high-pressure liquid carbon dioxide storage tank 14, the outlet of the high-pressure liquid carbon dioxide storage tank 14 is connected with the cold side pipeline inlet of the regenerator 6, the cold side pipeline outlet of the preheater 6 is connected with, the outlet of the pipeline at the hot side of the heat regenerator 6 is connected with the inlet of the pipeline at the hot side of the precooler 9, and the outlet of the pipeline at the hot side of the precooler 9 is connected with the inlet of the carbon dioxide separator 12; a first outlet of the carbon dioxide separator 12 is connected with an inlet of a carbon dioxide sub-compressor 10, an outlet of the carbon dioxide sub-compressor 10 is connected with an inlet of the precooler 9, and a second outlet of the carbon dioxide separator 12 is connected with an inlet of a low-pressure liquid carbon dioxide storage tank 13.

In an embodiment of the present invention, the thermal energy storage and utilization unit includes: the system comprises a cold water tank 15, an after-cooler 20, an electric heater 22, a hot water tank 23 and a preheater 2 which are connected in sequence through pipelines; wherein, the outlet of the cold water tank 15 is connected with the inlet of the cold side pipeline of the aftercooler 20, the outlet of the cold side pipeline of the aftercooler 20 is connected with the inlet of the electric heater 22, the outlet of the electric heater 22 is connected with the inlet of the hot water tank 23, and the outlet of the hot water tank 23 is connected with the inlet of the hot side pipeline of the preheater 2.

In an embodiment of the present invention, the kalina cycle unit includes: the system comprises a superheater 5, an ammonia water separator 7, an ammonia water steam generator 8, a condenser 19, an ejector 4 and a kalina circulating turbine 3; wherein, the outlet of the hot side pipeline of the preheater 2 of the heat energy storage utilization unit is connected with the inlet of the hot side pipeline of the superheater 5, the outlet of the hot side pipeline of the superheater 5 is connected with the inlet of the hot side pipeline of the ammonia water steam generator 8, and the outlet of the hot side pipeline of the ammonia water steam generator 8 is connected with the inlet of the cold water tank 15; an outlet of the ammonia water pump 17 is connected with an inlet of a cold side pipeline of the ammonia water steam generator 8, and an outlet of the cold side pipeline of the ammonia water steam generator 8 is connected with an inlet of the ammonia water separator 7; the first outlet of the ammonia water separator 7 is connected with the inlet of the cold side pipeline of the superheater 5, the outlet of the cold side pipeline of the superheater 5 is connected with the inlet of the kalina turbine 3, the outlet of the kalina turbine 3 is connected with the first inlet of the ejector 4, the second outlet of the ammonia water separator 7 is connected with the second inlet of the ejector 4, the outlet of the ejector 4 is connected with the inlet of the condenser 19, and the outlet of the condenser 19 is connected with the inlet of the ammonia water pump 17.

In the embodiment of the invention, a pressure reducing throttle valve 11 is arranged between the hot side outlet of the precooler 9 and the inlet of the ammonia water separator 12. An ammonia water pump 17 is arranged between the outlet of the condenser 19 and the cold side inlet of the ammonia water steam generator 8.

In the embodiment of the invention, aiming at the defects and shortcomings of the prior art, in order to recover the waste heat of the heat storage medium, fully utilize the heat storage potential of the heat storage medium, reduce the corrosion of turbine blades in the kalina cycle and reduce the potential energy dissipation in the poor ammonia solution in the kalina cycle, a high-temperature liquid carbon dioxide energy storage system coupled with the kalina cycle is provided, the system combines the innovative kalina cycle, solves the problems of the corrosion of the turbine blades in the basic kalina cycle and the potential energy waste of the poor ammonia solution, and the waste heat of the heat storage medium is safely and effectively utilized and the utilization rate of energy is improved by coupling the high-temperature liquid carbon dioxide energy storage system with the kalina cycle. And an electric heater is added in front of the heat storage medium heat storage tank, so that the heat storage potential of the heat storage medium is fully utilized.

The working principle and the specific operation process of the high-temperature liquid carbon dioxide energy storage system based on the coupling kalina cycle of the waste heat utilization of the heat storage medium are as follows:

in the energy storage process, the high-temperature liquid carbon dioxide energy storage and release unit and the heat energy storage and utilization unit work. The liquid carbon dioxide stored in the low-pressure liquid carbon dioxide storage tank firstly flows through the carbon dioxide evaporator to absorb heat to become saturated steam, then flows through the internal heat exchanger to absorb the compression heat of the compressed carbon dioxide to become high-pressure supercritical carbon dioxide, the high-pressure supercritical carbon dioxide enters the carbon dioxide compressor through a pipeline, the compressed supercritical carbon dioxide flows through the aftercooler to perform heat exchange with cold water from the cold water tank, cold energy in the cold water is absorbed, the temperature is reduced, and the supercritical carbon dioxide flowing through the aftercooler is condensed through the internal heat exchanger to become a high-pressure liquid state and is stored in the high-pressure liquid carbon dioxide storage tank. The carbon dioxide is compressed to generate compression heat, the ambient water is discharged from the cold water tank, the compression heat is absorbed in the aftercooler, and the water with the compression heat is conveyed to the electric heater for further heating and then conveyed to the hot water tank for storage for later use in the energy release process.

In the energy release process, the high-temperature liquid carbon dioxide energy storage and release unit, the heat energy storage and utilization unit and the innovative kalina circulation unit all work. The liquid carbon dioxide stored in the high-pressure liquid carbon dioxide storage tank firstly flows through the heat regenerator to absorb the residual heat of the residual high-temperature carbon dioxide at the outlet of the turbine to become supercritical carbon dioxide, then flows through the preheater to absorb the heat from the hot water stored in the hot water tank to reach the highest temperature, and the supercritical carbon dioxide reaching the highest temperature enters the expansion machine to be expanded and generate power. The exhaust gas of the turbine is subjected to heat exchange by the heat regenerator and then is mixed with the secondary flow from the sub-compressor as a primary flow, then the mixed flow is cooled by ambient water in the precooler, the cooled mixed flow flows through the throttle valve and is throttled and expanded into gas-liquid flow, then the gas flows through the carbon dioxide separator, the gas flows to the sub-compressor through the first outlet of the carbon dioxide separator, and the liquid flows out of the second outlet of the carbon dioxide separator and is stored in the low-pressure liquid carbon dioxide storage tank. Because the liquid carbon dioxide that high pressure liquid carbon dioxide storage tank discharged need absorb the heat, so in this process, the hot water that the hot water jar stored is discharged and is passed the heat to carbon dioxide in the preheater, and the hot water after flowing through the preheater is carried to further recovery heat in the kalina circulation, and finally, the cold water that flows out from the kalina circulation is stored in the cold water jar, continues to be used for the later stage of energy storage process and utilizes.

In the kalina cycle process, the high-temperature liquid carbon dioxide energy storage and release unit, the heat energy storage and utilization unit and the innovative kalina cycle unit all work. The basic ammonia water solution absorbs the waste heat in the heat storage medium from the superheater in the ammonia water steam generator to generate a two-phase mixture, the two-phase mixture is separated in the separator, the saturated ammonia-rich steam flows out from a first outlet of the ammonia water separator and is conveyed into the superheater to absorb the waste heat in the heat storage medium from the preheater, and the saturated ammonia-rich steam after heat absorption enters the kalina turbine to expand for power generation. And the saturated poor ammonia liquid enters the ejector through a second outlet of the ammonia water separator to be used as a primary flow to absorb the kalina turbine for exhausting, a two-phase mixture is formed on the back of the ejector, the two-phase mixture flows through the condenser to be condensed, and finally the condensed liquid is conveyed to the ammonia water steam generator through the ammonia water pump to carry out the next round of circulation.

According to the technical scheme, the high-temperature liquid carbon dioxide energy storage system based on the coupling kalina cycle of the waste heat utilization of the heat storage medium has the technical advantages that: according to the invention, the high-temperature liquid carbon dioxide energy storage system is circularly coupled with the kalina, so that the waste heat of the heat storage medium is safely and effectively utilized, and the utilization rate of energy is improved. Compared with the basic kalina cycle, the invention is improved by two points: 1. a superheater is added before the ammonia water turbine to ensure dry expansion of the ammonia-rich steam in the turbine and reduce corrosion to the turbine; 2. the ejector is used for replacing a throttle valve, so that the pressure difference of the ammonia water turbine is increased, and the output power of the ammonia water turbine is improved. The electric heater device is added in front of the hot water tank, so that the storage temperature of the heat storage medium is improved, and the heat storage potential of the heat storage medium is fully utilized. On the basis of a basic liquid carbon dioxide energy storage system, a condensation cycle is introduced between the turbine and the low-pressure liquid carbon dioxide storage tank, so that the problem that carbon dioxide at the outlet of the turbine of the traditional liquid carbon dioxide energy storage system is difficult to condense is solved.

Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art can make modifications and equivalents to the embodiments of the present invention without departing from the spirit and scope of the present invention, which is set forth in the claims of the present application.