Photo-thermal composite ammonia absorption multi-energy cogeneration system

Abstract

This invention provides a solar-thermal combined ammonia absorption cogeneration system, relating to the field of thermal system technology. The solar-thermal combined ammonia absorption cogeneration system includes a heat collection and storage subsystem, an energy storage subsystem, a refrigeration subsystem, and a power generation subsystem. The heat collection and storage subsystem is adapted to use solar energy to heat a heat-conducting medium to store a large amount of heat, and some of this heat can be used for heating. The energy storage subsystem is adapted to use the heat from the heat-conducting medium to heat a concentrated ammonia solution and separate it, generating a dilute ammonia solution and liquid ammonia. The refrigeration subsystem is adapted to use the throttling expansion process of liquid ammonia to absorb heat from the cold storage medium and store the cold energy. The power generation subsystem is adapted to use the heat from the heat-conducting medium to heat liquid ammonia to generate high-pressure ammonia vapor, and use the high-pressure ammonia vapor to drive a generator set to generate electricity. By applying the solar-thermal combined ammonia absorption cogeneration system provided by this invention, it is possible to utilize renewable energy for the combined supply of cold, heat, and electricity, thereby improving energy efficiency.

Description

Technical Field

[0001] This invention relates to the field of thermal system technology, and in particular to a photothermal composite ammonia absorption multi-energy supply system. Background Technology

[0002] The application of renewable energy in multiple technology fields such as power generation, heating, and cooling helps reduce carbon emissions and achieve green development.

[0003] Limited by geographical environment, resource conditions, and other factors, the utilization of renewable energy is intermittent and unstable. Therefore, developing corresponding energy storage technologies has become an effective way to achieve sustainable utilization of renewable energy. Meanwhile, thermal systems capable of combining cooling, heating, and electricity are receiving increasing attention. In some remote areas where heating networks are not available and power supply is tight, using electric power for heating and cooling presents significant challenges. Therefore, developing small-scale combined cooling, heating, and power systems based on renewable energy is of great importance. Summary of the Invention

[0004] This invention aims to at least solve one of the technical problems existing in related technologies. To this end, this invention provides a combined solar-thermal ammonia absorption multi-energy supply system, which can realize the combined supply of cooling, heating, and electrical energy using renewable energy sources, thereby improving energy utilization efficiency.

[0005] This invention provides a photothermal combined ammonia absorption multi-energy supply system, comprising:

[0006] A heat collection and storage subsystem, wherein a heat-conducting medium is provided within the heat collection and storage subsystem, and the heat collection and storage subsystem is adapted to use solar energy to heat the heat-conducting medium;

[0007] An energy storage subsystem is provided with a concentrated ammonia solution. The energy storage subsystem is adapted to use the heat of the heat-conducting medium to heat the concentrated ammonia solution and separate it to generate a dilute ammonia solution and liquid ammonia.

[0008] A refrigeration subsystem is provided with a cold storage medium, and the refrigeration subsystem is adapted to absorb the heat of the cold storage medium by means of liquid ammonia through throttling expansion;

[0009] A power generation system, comprising a generator set, wherein the power generation system is adapted to use the heat of the heat-conducting medium to heat the liquid ammonia to generate high-pressure ammonia vapor, and to use the high-pressure ammonia vapor to drive the generator set to generate electricity.

[0010] The solar-thermal ammonia absorption combined energy supply system provided in this embodiment integrates a solar thermal collection and storage subsystem, an energy storage subsystem, a refrigeration subsystem, and a power generation subsystem. It utilizes solar thermal collection technology to enrich solar thermal energy and exchanges heat between the heat-conducting, heat-storing, and cold-storing working media. This not only meets users' heating and cooling needs but also stores energy and provides electricity output. Specifically, the solar thermal collection and storage subsystem uses solar energy as the heat collection energy source. The collected heat is used to heat the heat-conducting medium, which stores a large amount of heat. A portion of this heat can be transferred to the heating heat storage medium, achieving high-temperature heating. Users can then use the heating heat storage medium for heating to meet their heating needs. The remaining heat in the heat-conducting medium can drive the operation of the solar-thermal ammonia absorption combined energy supply system. The energy storage subsystem can use the heat from the heat-conducting medium to heat a concentrated ammonia solution. After heating, the concentrated ammonia solution is separated into liquid ammonia and dilute ammonia solution, which are then stored. In the refrigeration subsystem, stored liquid ammonia absorbs heat from the cold storage medium through throttling expansion, thus cooling the cold storage medium and storing the cold energy. Simultaneously, after heat exchange, the liquid ammonia transforms into ammonia vapor, which mixes with a dilute ammonia solution to generate a concentrated ammonia solution, which is then stored in the energy storage subsystem for the next refrigeration cycle. In the power generation system, liquid ammonia is pressurized and heat-exchanged to generate ammonia vapor, which is used to drive a generator set to produce electricity. The ammonia vapor, after heat exchange, can again mix with a dilute ammonia solution to generate a concentrated ammonia solution, which is stored in the energy storage subsystem for the next power generation cycle. Therefore, the solar-thermal composite ammonia absorption multi-energy combined supply system provided in this embodiment of the invention can fully utilize solar and thermal resources, promote the comprehensive cascade utilization of solar and thermal resources, and simultaneously meet the demand for multi-energy combined supply of cold, heat, and electricity in a smart micro-energy internet.

[0011] According to one embodiment of the present invention, the heat collection and storage subsystem includes a solar heat collection mirror field, a high-temperature heat transfer oil tank, a hot water storage tank and a low-temperature heat transfer oil tank connected in sequence. The heat transfer medium is stored in the high-temperature heat transfer oil tank and the low-temperature heat transfer oil tank, and the hot water storage tank is provided with a heating heat storage medium.

[0012] According to one embodiment of the present invention, the energy storage subsystem includes a concentrated ammonia water storage tank, a generator, a separator, a condenser and a liquid ammonia storage tank connected in sequence, wherein the generator is connected to the heat collection and storage subsystem;

[0013] The energy storage subsystem also includes a dilute ammonia water storage tank, which is connected to the separator.

[0014] The concentrated ammonia solution is stored in the concentrated ammonia storage tank, the dilute ammonia solution is stored in the dilute ammonia storage tank, and the liquid ammonia is stored in the liquid ammonia storage tank.

[0015] According to one embodiment of the present invention, the refrigeration subsystem includes an evaporator, an absorber, and a solution exchanger connected in sequence, wherein the evaporator is connected to the liquid ammonia storage tank;

[0016] The refrigeration subsystem also includes a cold water storage tank, which is connected to the evaporator, and the cold storage medium is stored in the cold water storage tank.

[0017] According to one embodiment of the present invention, the generator set includes a booster device, a turbine expander unit and a generator, wherein the turbine expander unit is connected to the liquid ammonia storage tank, the booster device is connected to the liquid ammonia storage tank, and the generator is connected to the turbine expander unit;

[0018] The pressurization device is also connected to the heat collection and storage subsystem.

[0019] According to one embodiment of the present invention, the combined solar thermal and ammonia absorption multi-energy supply system further includes a cooling tower, which is connected to the condenser and the absorber.

[0020] According to one embodiment of the present invention, a first connecting valve is provided between the generator and the heat collection and storage subsystem.

[0021] According to one embodiment of the present invention, a second connecting valve is provided between the evaporator and the liquid ammonia storage tank.

[0022] According to one embodiment of the present invention, a third connecting valve is provided between the pressurization device and the liquid ammonia storage tank, a fourth connecting valve is provided between the pressurization device and the heat collection and storage subsystem, and a fifth connecting valve is provided between the turbine expander unit and the liquid ammonia storage tank.

[0023] According to one embodiment of the present invention, the heat collection and storage subsystem further includes a heat transfer oil pipeline, in which the heat transfer medium flows. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the structure of the photothermal composite ammonia absorption multi-energy combined supply system provided in the embodiment of the present invention.

[0026] Figure label:

[0027] 10. Solar collector and storage subsystem; 110. Solar collector mirror field; 120. High-temperature thermal oil tank; 130. Hot water storage tank; 140. Low-temperature thermal oil tank; 151. First connecting valve; 152. Second connecting valve; 153. Third connecting valve; 154. Fourth connecting valve; 155. Fifth connecting valve; 160. Thermal oil pipeline;

[0028] 20. Energy storage subsystem; 210. Concentrated ammonia storage tank; 220. Generator; 230. Separator; 240. Condenser; 250. Liquid ammonia storage tank; 260. Dilute ammonia storage tank;

[0029] 30. Refrigeration subsystem; 310. Evaporator; 320. Absorber; 330. Solution exchanger; 340. Chilled water tank;

[0030] 40. Electronic system; 410. Pressurization unit; 420. Turbine expander unit; 430. Generator;

[0031] 510. Cooling tower. Detailed Implementation

[0032] The embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of the invention.

[0033] In the description of the embodiments of the present invention, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of the present invention. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0034] In the description of the embodiments of the present invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of the present invention based on the specific circumstances.

[0035] In embodiments of the present invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0036] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0037] like Figure 1 As shown, this embodiment of the invention provides a solar-thermal composite ammonia absorption multi-energy system, including a heat collection and storage subsystem 10, an energy storage subsystem 20, a refrigeration subsystem 30, and a power generation system 40. The heat collection and storage subsystem 10 contains a heat-conducting medium and is adapted to use solar energy to heat the heat-conducting medium. The energy storage subsystem 20 contains a concentrated ammonia solution and is adapted to use the heat from the heat-conducting medium to heat the concentrated ammonia solution and separate it to generate a dilute ammonia solution and liquid ammonia. The refrigeration subsystem 30 contains a cold storage medium and is adapted to use liquid ammonia to absorb the heat from the cold storage medium through throttling expansion. The power generation system 40 includes a generator set 430 and is adapted to use the heat from the heat-conducting medium to heat the liquid ammonia to generate high-pressure ammonia vapor, and use the high-pressure ammonia vapor to drive the generator set 430 to generate electricity.

[0038] The solar-thermal composite ammonia absorption multi-energy combined supply system provided in this embodiment integrates a heat collection and storage subsystem 10, an energy storage subsystem 20, a refrigeration subsystem 30, and a power generation system 40. It utilizes solar thermal collection technology to enrich solar thermal energy and exchanges heat between the heat-conducting, heat-storing, and cold-storing working media. This not only meets users' heating and cooling needs but also stores energy and provides electricity output. Specifically, the heat collection and storage subsystem 10 uses solar energy as the heat collection energy source. The collected heat is used to heat the heat-conducting medium. The heated heat-conducting medium stores a large amount of heat, which can be transferred to the heating heat storage medium, achieving high-temperature heating. Users can then use the heating heat storage medium for heating to meet their heating needs. The remaining heat in the heat-conducting medium can drive the operation of the solar-thermal composite ammonia absorption multi-energy combined supply system. The energy storage subsystem 20 can use the heat from the heat-conducting medium to heat a concentrated ammonia solution. After heating, the concentrated ammonia solution is separated into liquid ammonia and dilute ammonia solution, which are then stored. In the refrigeration subsystem 30, the stored liquid ammonia absorbs heat from the cold storage medium through throttling expansion, achieving cooling of the cold storage medium and storing the cold energy. Simultaneously, after heat exchange, the liquid ammonia becomes ammonia vapor, which mixes with a dilute ammonia solution to generate a concentrated ammonia solution, stored in the energy storage subsystem 20, and participates in the next refrigeration cycle. In the power generation system 40, liquid ammonia is pressurized and heat-exchanged to generate ammonia vapor, which drives generator 430 to generate electricity. After heat exchange, the ammonia vapor can be mixed again with a dilute ammonia solution to generate a concentrated ammonia solution, stored in the energy storage subsystem 20, and participate in the next power generation cycle. Therefore, the solar-thermal composite ammonia absorption multi-energy combined supply system provided by this embodiment of the invention can fully utilize solar and thermal resources, promote the comprehensive cascade utilization of solar and thermal resources, and simultaneously meet the demand for multi-energy combined supply of cold, heat, and electricity in a smart micro-energy internet.

[0039] like Figure 1 As shown, in an embodiment of the present invention, the heat collection and storage subsystem 10 includes a solar heat collection mirror field 110, a high-temperature heat transfer oil tank 120, a hot water storage tank 130 and a low-temperature heat transfer oil tank 140 connected in sequence. The heat transfer medium is stored in the high-temperature heat transfer oil tank 120 and the low-temperature heat transfer oil tank 140, and the hot water storage tank 130 is provided with a heating heat storage medium.

[0040] like Figure 1 As shown, in an embodiment of the present invention, a first connecting valve 151 is provided between the generator 220 and the heat collection and storage subsystem 10.

[0041] like Figure 1 As shown, in an embodiment of the present invention, a second connecting valve 152 is provided between the evaporator 310 and the liquid ammonia storage tank 250.

[0042] like Figure 1As shown, in an embodiment of the present invention, a third connecting valve 153 is provided between the pressurizing device 410 and the liquid ammonia storage tank 250, a fourth connecting valve 154 is provided between the pressurizing device 410 and the heat collection and storage subsystem 10, and a fifth connecting valve 155 is provided between the turbine expander unit 420 and the liquid ammonia storage tank 250.

[0043] like Figure 1 As shown, in an embodiment of the present invention, the heat collection and storage subsystem 10 further includes a heat transfer oil pipeline 160, in which the heat transfer medium flows.

[0044] The solar thermal collector field 110 is a trough-type solar thermal collector device, connected to a low-temperature thermal oil tank 140 and a high-temperature thermal oil tank 120. The collected heat is used to heat the thermal medium, such as thermal oil, up to 250°C. The high-temperature thermal oil in the high-temperature thermal oil tank 120 stores a large amount of heat. Heat exchange can be performed between the thermal oil and the heating storage medium, such as water, in the hot water storage tank 130 to heat the water. Users can then use the heated water for heating to meet their heating needs. The water temperature in the hot water storage tank 130 is typically between 85°C and 90°C.

[0045] Specifically, based on the aforementioned technical features, when the system operates in heat storage mode, the fourth connecting valve 154 between the heat transfer oil pipeline 160 and the booster device 410, and the first connecting valve 151 between the heat transfer oil pipeline 160 and the generator 220 are closed, while the connecting valve between the heat transfer oil pipeline 160 and the hot water storage tank 130 is opened. The heat transfer oil pump is activated, allowing the heat transfer oil in the system to be gradually heated by the collected solar energy, thereby raising the temperature of the heat transfer oil and storing heat. Part of the heat from the heat transfer oil can be used to heat the water in the hot water storage tank 130, allowing users to use the heated water for warmth. The heat transfer oil can be heated up to 250°C, while the water temperature in the hot water storage tank 130 is typically between 85°C and 90°C.

[0046] like Figure 1 As shown, in an embodiment of the present invention, the energy storage subsystem 20 includes a concentrated ammonia water storage tank 210, a generator 220, a separator 230, a condenser 240 and a liquid ammonia storage tank 250 connected in sequence, and the generator 220 is connected to the heat collection and storage subsystem 10.

[0047] The energy storage subsystem 20 also includes a dilute ammonia storage tank 260, which is connected to the separator 230;

[0048] Concentrated ammonia solution is stored in concentrated ammonia storage tank 210, dilute ammonia solution is stored in dilute ammonia storage tank 260, and liquid ammonia is stored in liquid ammonia storage tank 250.

[0049] like Figure 1As shown, in an embodiment of the present invention, the photothermal ammonia absorption multi-energy combined supply system further includes a cooling tower 510, which is connected to the condenser 240 and the absorber 320.

[0050] In the energy storage subsystem 20 using ammonia as the working fluid, a concentrated ammonia solution is heated in evaporator 310, with the heat required for heating provided by heat transfer oil. The heated ammonia solution enters separator 230 for distillation and separation. The ammonia vapor enters condenser 240 and is cooled by cooling water to become a high-concentration, low-pressure pure ammonia solution, which is then stored in liquid ammonia storage tank 250.

[0051] Specifically, based on the aforementioned technical features, when the system operates in energy storage mode, the connecting valves between the heat transfer oil pipeline 160 and the hot water storage tank 130, and the fourth connecting valve 154 between the heat transfer oil pipeline 160 and the booster device 410 are closed. The first connecting valve 151 between the heat transfer oil pipeline 160 and the generator 220 is opened. The ammonia solution pump is started, and the ammonia solution enters the generator 220 from the concentrated ammonia storage tank 210. It is heated by the high-temperature heat transfer oil in the heat transfer oil pipeline 160, with the heating temperature generally around 140°C. The heated ammonia solution enters the separator 230 for distillation separation. The ammonia vapor at the top enters the condenser 240, is cooled by cooling water provided by the cooling tower 510, and then enters the liquid ammonia storage tank 250 for storage. The dilute ammonia solution at the bottom of the separator 230 enters the dilute ammonia storage tank 260. The liquid ammonia entering the liquid ammonia storage tank 250 has a concentration of 99%, a temperature of 25-30°C, and a pressure of 1.0-1.2 MPa.

[0052] like Figure 1 As shown, in an embodiment of the present invention, the refrigeration subsystem 30 includes an evaporator 310, an absorber 320 and a solution exchanger 330 connected in sequence, and the evaporator 310 is connected to the liquid ammonia storage tank 250.

[0053] The refrigeration subsystem 30 also includes a cold water storage tank 340, which is connected to the evaporator 310, and the cold storage medium is stored in the cold water storage tank 340.

[0054] In the absorption refrigeration system, the ammonia solution, after being throttled and depressurized, enters the evaporator 310 and expands into ammonia vapor. During this process, it absorbs heat from the outside environment, causing its temperature to drop. This cooling capacity is stored in the chilled water tank 340 via chilled water to meet the user's cooling needs. The expanded ammonia vapor enters the absorber 320 and is absorbed by the dilute ammonia solution, becoming a concentrated ammonia solution, which then enters the generator 220 for heating, starting the next cycle. In the solution exchanger 330, the concentrated ammonia solution flowing out of the absorber 320 exchanges heat with the dilute ammonia solution flowing out of the separator 230 to improve energy utilization efficiency.

[0055] Specifically, based on the aforementioned technical features, when the system operates in cold storage mode, the third connecting valve 153 between the liquid ammonia storage tank 250 and the pressurization device 410, and the fifth connecting valve 155 between the liquid ammonia storage tank 250 and the turbine expander unit 420 are closed. The second connecting valve 152 between the liquid ammonia storage tank 250 and the evaporator 310 is opened, and simultaneously the outlet valve of the dilute ammonia water storage tank 260 is opened. At this time, liquid ammonia flows out from the bottom of the liquid ammonia storage tank 250, undergoes throttling and pressure reduction, and then enters the evaporator 310 for expansion, absorbing heat from the chilled water in the cold storage tank 340 and storing the cooling capacity. The operating pressure inside the evaporator 310 is generally 0.3-0.4 MPa. The expanded ammonia vapor enters the absorber 320, where it is absorbed by the dilute ammonia water flowing from the dilute ammonia water tank, becoming a concentrated ammonia solution. After heat exchange with the dilute ammonia solution flowing into the absorber 320 in the solution exchanger 330, it enters the concentrated ammonia water storage tank 210.

[0056] like Figure 1 As shown, in an embodiment of the present invention, the generator 430 group includes a booster device 410, a turbine expander unit 420 and a generator 430. The turbine expander unit 420 is connected to the liquid ammonia storage tank 250, the booster device 410 is connected to the liquid ammonia storage tank 250, and the generator 430 is connected to the turbine expander unit 420.

[0057] The pressurization device 410 is also connected to the heat collection and storage subsystem 10.

[0058] In the power generation system, pure ammonia solution flows from the bottom of the liquid ammonia storage tank 250. After heat exchange in the pressurization device 410, it becomes ammonia vapor and then enters the upper part of the liquid ammonia storage tank 250, thus pressurizing the liquid ammonia tank. The heat required by the pressurization device 410 comes from the heat transfer oil in the heat collection and storage subsystem 10. The pressurized high-pressure ammonia vapor enters the turbine expander unit 420 to do work, driving the generator 430 to generate electricity. The exhaust steam enters the absorber 320 to start the next cycle.

[0059] Specifically, based on the aforementioned technical features, when the system executes the power generation mode, the second connecting valve 152 between the liquid ammonia storage tank 250 and the evaporator 310 is closed, the third connecting valve 153 between the liquid ammonia storage tank 250 and the pressurization device 410 is opened, the fourth connecting valve 154 between the heat transfer oil pipeline 160 and the pressurization device 410 is opened, and the outlet valve of the dilute ammonia water storage tank 260 is opened simultaneously. At this time, liquid ammonia flows out from the bottom of the liquid ammonia storage tank 250 into the pressurization device 410, where it is heated by the high-temperature heat transfer oil from the heat collection and storage subsystem 10, becoming ammonia vapor and entering the top of the liquid ammonia storage tank 250, thus completing the pressurization of the liquid ammonia storage tank 250. After the pressure in the liquid ammonia storage tank 250 reaches 3MPa, the fifth connecting valve 155 between the liquid ammonia storage tank 250 and the turbine expander unit 420 is opened, and the high-pressure ammonia vapor enters the turbine expander unit 420 to expand and do work, driving the generator set 430 to generate electricity. After expansion, the exhaust steam enters the absorber 320 and is absorbed by the dilute ammonia solution, becoming a concentrated ammonia solution that enters the concentrated ammonia storage tank 210.

[0060] The solar thermal ammonia absorption combined energy system provided in this embodiment of the invention can also operate two or more of the following modes simultaneously: thermal storage mode, energy storage mode, cold storage mode, and power generation mode.

[0061] For example, when the thermal storage mode and energy storage mode are operating simultaneously, the fourth connecting valve 154 between the heat transfer oil pipeline 160 and the booster device 410 is closed, and the connecting valve between the heat transfer oil pipeline 160 and the hot water storage tank 130 and the first connecting valve 151 between the heat transfer oil pipeline 160 and the generator 220 are opened. At this time, the heat transfer oil of the thermal collection and storage subsystem 10 can heat the water in the hot water storage tank 130 to complete the heating and thermal storage, and can also heat the concentrated ammonia solution in the generator 220 to complete the energy storage.

[0062] When the thermal storage mode and power generation mode are operating simultaneously, the first connecting valve 151 between the heat transfer oil pipeline 160 and the generator 220 is closed, and the connecting valve between the heat transfer oil pipeline 160 and the hot water storage tank 130 and the fourth connecting valve 154 between the heat transfer oil pipeline 160 and the pressurization device 410 are opened. At this time, the heat transfer oil of the thermal collection and storage subsystem 10 can heat the water in the hot water storage tank 130 to complete the heating and thermal storage, and can also heat the liquid ammonia in the pressurization device 410 to turn it into steam to pressurize the liquid ammonia storage tank 250.

[0063] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A photothermal combined ammonia absorption multi-energy supply system, characterized in that, include: A heat collection and storage subsystem, wherein a heat-conducting medium is provided within the heat collection and storage subsystem, and the heat collection and storage subsystem is adapted to use solar energy to heat the heat-conducting medium; An energy storage subsystem is provided with a concentrated ammonia solution. The energy storage subsystem is adapted to use the heat of the heat-conducting medium to heat the concentrated ammonia solution and separate it to generate a dilute ammonia solution and liquid ammonia. A refrigeration subsystem is provided with a cold storage medium, and the refrigeration subsystem is adapted to absorb the heat of the cold storage medium by means of liquid ammonia through throttling expansion; A power generation system, comprising a generator set, the power generation system being adapted to use the heat of the heat-conducting medium to heat the liquid ammonia to generate high-pressure ammonia vapor, and to use the high-pressure ammonia vapor to drive the generator set to generate electricity; The heat collection and storage subsystem includes a solar heat collection mirror field, a high-temperature heat transfer oil tank, a hot water storage tank and a low-temperature heat transfer oil tank connected in sequence. The heat transfer medium is stored in the high-temperature heat transfer oil tank and the low-temperature heat transfer oil tank, and the hot water storage tank is equipped with a heating heat storage medium. The energy storage subsystem includes a concentrated ammonia water storage tank, a generator, a separator, a condenser, and a liquid ammonia storage tank connected in sequence, and the generator is connected to the heat collection and storage subsystem. The energy storage subsystem also includes a dilute ammonia water storage tank, which is connected to the separator. The concentrated ammonia solution is stored in the concentrated ammonia storage tank, the dilute ammonia solution is stored in the dilute ammonia storage tank, and the liquid ammonia is stored in the liquid ammonia storage tank; The refrigeration subsystem includes an evaporator, an absorber, a solution exchanger, and a cold water storage tank connected in sequence. The evaporator is connected to the liquid ammonia storage tank via a second connecting valve. The solution exchanger is connected to the concentrated ammonia storage tank and the dilute ammonia storage tank. The cold water storage tank is connected to the evaporator, and the cold storage medium is stored in the cold water storage tank. The generator set includes a booster device, a turbine expander unit, and a generator. The inlet end of the turbine expander unit is connected to the liquid ammonia storage tank, the outlet end of the turbine expander unit is connected to the absorber, the booster device is connected to the liquid ammonia storage tank, and the generator is connected to the turbine expander unit. The pressurization device is also connected to the heat collection and storage subsystem; The solar-thermal combined ammonia absorption multi-energy system can operate independently in one of the following modes: thermal storage, energy storage, cold storage, and power generation. Alternatively, the solar-thermal combined ammonia absorption multi-energy system can simultaneously operate in either the energy storage mode and the thermal storage mode, or simultaneously operate in either the energy storage mode and the cold storage mode, or simultaneously operate in either the energy storage mode, the thermal storage mode, and the cold storage mode, or simultaneously operate in either the power generation mode and the thermal storage mode, or simultaneously operate in either the power generation mode, the thermal storage mode, and the cold storage mode, or simultaneously operate in either the thermal storage mode and the cold storage mode.

2. The photothermal combined ammonia absorption multi-energy supply system according to claim 1, characterized in that, The combined solar thermal ammonia absorption multi-energy supply system also includes a cooling tower, which is connected to the condenser and the absorber.

3. The photothermal combined ammonia absorption multi-energy supply system according to claim 1, characterized in that, A first connecting valve is provided between the generator and the heat collection and storage subsystem.

4. The photothermal composite ammonia absorption multi-energy combined supply system according to claim 1, characterized in that, A second connecting valve is provided between the evaporator and the liquid ammonia storage tank.

5. The photothermal combined ammonia absorption multi-energy supply system according to claim 1, characterized in that, A third connecting valve is provided between the pressurization device and the liquid ammonia storage tank, a fourth connecting valve is provided between the pressurization device and the heat collection and storage subsystem, and a fifth connecting valve is provided between the turbine expander unit and the liquid ammonia storage tank.

6. The photothermal combined ammonia absorption multi-energy supply system according to any one of claims 1-5, characterized in that, The heat collection and storage subsystem also includes a heat transfer oil pipeline, in which the heat transfer medium flows.

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