A heat management method based on a double-effect absorption-based combined cooling and heating system

Abstract

The application provides a heat management method based on a double-effect absorption type cold and heat combined supply system, comprising the following steps: starting a double-effect generation process of a high-pressure generator and a low-pressure generator; detecting an ambient temperature in a factory building; if a current temperature of the factory building is less than a first temperature threshold, controlling a first three-way valve, a second three-way valve, a first four-way valve and a second four-way valve to switch to a heat supply operation state respectively, so as to respectively connect a heat supply water loop and an auxiliary equipment waste heat utilization loop, and completing a heat supply cycle; if the current temperature of the factory building is greater than the first temperature threshold, controlling the first three-way valve, the second three-way valve, the first four-way valve and the second four-way valve to switch to a cooling supply operation state respectively, so as to connect a heat source steam heat dissipation loop, an auxiliary equipment waste heat dissipation loop and a cooling water loop, and completing a cooling supply cycle. The application improves the utilization efficiency of the energy of the heat source steam generated by the absorption nuclear power plant equipment by combining the high-pressure generator and the low-pressure generator.

Description

Technical Field

[0001] This application relates to the field of nuclear power equipment heat utilization technology, and in particular to a heat management method based on a dual-effect absorption combined cooling and heating system. Background Technology

[0002] The existing thermal management system of nuclear power plants has many problems, specifically: on the one hand, it requires an independent low-temperature heat source to provide energy for the operation of the evaporator, resulting in energy waste and increased costs; on the other hand, the existing heating process only absorbs the heat source steam of the nuclear power plant through a single generator, which results in the incomplete absorption of the heat source steam of the nuclear power plant and the influence of different refrigerant solutions, which leads to the incomplete recycling of the refrigerant solution, further causing resource waste. Summary of the Invention

[0003] In view of this, the purpose of this application is to provide at least one thermal management method based on a dual-effect absorption combined cooling and heating system, which improves the energy utilization efficiency of nuclear power plant equipment by absorbing the energy from the heat source steam generated by the nuclear power plant equipment through a combination of high and low pressure generators.

[0004] This application mainly includes the following aspects:

[0005] In a first aspect, embodiments of this application provide a thermal management method based on a double-effect absorption combined cooling and heating system. The double-effect absorption combined cooling and heating system includes a high-pressure generator, an absorber, a condenser, an evaporator, a low-pressure generator, a heat exchanger group, auxiliary equipment heat exchangers, a first cold source heat exchanger, a second cold source heat exchanger, a first three-way valve, a second three-way valve, a first four-way valve, and a second four-way valve. The high-pressure generator is connected to heat source steam provided by nuclear power plant equipment via a steam pipeline. The high-pressure generator is connected to the absorber via the heat exchanger group. A solution pipeline is provided between the high-pressure generator, the heat exchanger group, and the absorber. The high-pressure generator, the low-pressure generator, and the condenser are sequentially connected via steam pipelines. The low-pressure generator is connected to the heat exchanger group via a solution pipeline, and the system is connected to the heat exchanger group via the heat exchanger... The solution pipeline within the heat exchanger unit connects to the absorber. The condenser and evaporator are connected via a solution pipeline, and the evaporator and absorber are connected via a steam pipeline. A first three-way valve is sequentially connected to the absorber, condenser, and second three-way valve via a circulating water pipeline. The second three-way valve is also connected to the heating outlet and, via a circulating water pipeline, to the first cold source heat exchanger. The auxiliary equipment heat exchanger is connected to a first four-way valve, evaporator, second four-way valve, and second cold source heat exchanger via a circulating water pipeline. The first four-way valve is also connected to the cooling return water and second four-way valve. The second four-way valve is also connected to the cooling supply end. The auxiliary equipment heat exchanger also absorbs waste heat from the nuclear power plant's auxiliary equipment via a circulating water pipeline. The method includes: starting the high-pressure generator and the low-pressure... The generator operates in a dual-effect cycle; it detects the ambient temperature inside the plant; if the current plant temperature is lower than a first temperature threshold, it controls the first three-way valve, second three-way valve, first four-way valve, and second four-way valve to switch to heating operation mode, thereby connecting the hot water supply circuit and the auxiliary equipment waste heat utilization circuit. The hot water supply circuit is a circulating water circuit formed by the heating return water end, the first three-way valve, the absorber, the condenser, the second three-way valve, and the heating output end; the auxiliary equipment waste heat utilization circuit is a circulating water circuit formed between the auxiliary equipment heat exchanger, the first four-way valve, the evaporator, the second four-way valve, and the second cold source heat exchanger; the heating cycle is completed by connecting the hot water supply circuit and the auxiliary equipment waste heat utilization circuit; if the current plant temperature is higher than the first temperature threshold... If the value is set, the first three-way valve, the second three-way valve, the first four-way valve, and the second four-way valve are switched to the cooling operation state, thereby connecting the heat source steam heat dissipation circuit, the auxiliary equipment waste heat dissipation circuit, and the cooling water circuit. The heat source steam heat dissipation circuit is the circulating water circuit between the first three-way valve, the absorber, the condenser, the second three-way valve, and the first cold source heat exchanger. The auxiliary equipment waste heat dissipation circuit is the circulating water circuit between the auxiliary equipment heat exchanger, the first four-way valve, the second four-way valve, and the second cold source heat exchanger. The cooling water circuit is the circulating water circuit formed by the cooling water return end, the first four-way valve, the evaporator, the second four-way valve, and the cooling output end. The cooling cycle is completed by utilizing the heat source steam heat dissipation circuit, the auxiliary equipment waste heat dissipation circuit, and the cooling water circuit.

[0006] In one possible implementation, the heat exchanger assembly includes a first heat exchanger and a second heat exchanger. The double-effect absorption combined cooling and heating system further includes a solution pump, a first throttle valve, a second throttle valve, a third throttle valve, a fourth throttle valve, and a first circulating pump. The high-pressure generator is connected to the absorber via a solution pipeline, sequentially passing through the first heat exchanger, the second heat exchanger, and the solution pump. The high-pressure generator is also connected to the absorber via a solution pipeline, sequentially passing through the first heat exchanger, the second throttle valve, the second heat exchanger, and the first throttle valve. One solution pipeline from the low-pressure generator is connected to the solution pipeline between the first and second heat exchangers via the third throttle valve. The other solution pipeline from the low-pressure generator is connected to the solution pipeline between the second throttle valve and the second heat exchanger. A fourth throttle valve is installed on the solution pipeline between the condenser and the low-pressure generator. The double-effect generation process includes: absorbing heat from the refrigerant solution in the high-pressure generator. The heat from the steam generates high-pressure refrigerant vapor and forms a concentrated absorbent solution. The high-pressure refrigerant vapor is input into the low-pressure generator through a solution pipeline. The high-pressure refrigerant vapor is heat-absorbing by the dilute absorbent solution in the low-pressure generator, generating low-pressure refrigerant vapor and a concentrated absorbent solution. The low-pressure refrigerant vapor flows into the condenser through the fourth throttle valve. The concentrated absorbent solution in the high-pressure generator is input into the absorber through the first heat exchanger, the second throttle valve, the second heat exchanger, and the first throttle valve. The concentrated absorbent solution in the low-pressure generator is input into the absorber through the second heat exchanger and the first throttle valve. The dilute absorbent solution generated by the absorption in the absorber is pressurized by a solution pump. A portion of the pressurized dilute absorbent solution output from the solution pump is returned to the high-pressure generator through the second heat exchanger and the first heat exchanger, while the other portion is returned to the low-pressure generator through the second heat exchanger and the third throttle valve.

[0007] In one possible implementation, a fifth throttle valve is installed on the solution pipeline between the condenser and the evaporator; a first circulation pump is installed on the circulation pipeline connecting the absorber and the condenser; a second circulation pump is installed between the evaporator and the second four-way valve; and a third circulation pump is installed between the second four-way valve and the second cold source heat exchanger. The heating cycle is completed by controlling the first and second terminals of a first three-way switch to be in the ON state, and controlling the first and third terminals of the second three-way valve to be in the ON state, thereby opening the hot water supply circuit; the heating circulating water flows into the absorber through the first three-way switch; and the absorber absorbs the gaseous refrigerant from the evaporator to release energy into the heating circulating water. The process generates a low-concentration refrigerant; the heating circulating water output from the absorber is transported to the condenser via the first circulating pump; the low-pressure refrigerant vapor is condensed in the condenser to release heat to the heating circulating water flowing through the condenser; the condensed liquid refrigerant is depressurized by the fifth throttle valve and flows into the evaporator, while the heating circulating water that absorbs the condensation heat is transported to the heating output end via the second three-way valve; the first four-way valve and the second four-way valve are controlled to be in heating operation state to connect the auxiliary equipment waste heat utilization circuit; the auxiliary equipment waste heat utilization circuit provides a low-temperature heat source for the evaporator; under the energy of the low-temperature heat source, the liquid refrigerant is evaporated in the evaporator to generate gaseous refrigerant, which is then input into the absorber through the steam pipe to complete the heating cycle.

[0008] In one possible implementation, a low-temperature heat source is provided to the evaporator by: controlling the first and second ends of the first four-way valve to be in the on state and controlling the first and second ends of the second four-way valve to be in the on state, so as to connect the auxiliary equipment waste heat utilization loop; absorbing the waste heat generated by the nuclear power plant auxiliary equipment through the auxiliary equipment heat exchanger and transferring it to the cooling water flowing through the auxiliary equipment heat exchanger; transmitting the cooling water output from the auxiliary equipment heat exchanger to the evaporator through the first and second ends of the first four-way valve, so that the liquid refrigerant in the evaporator evaporates into gaseous refrigerant by absorbing heat from the cooling water; driving the second circulation pump and the third circulation pump to return the cooling water flowing out of the evaporator to the auxiliary equipment heat exchanger through the first and second ends of the second four-way valve and the second cold source heat exchanger, thus completing the supply of the low-temperature heat source required by the evaporator through the auxiliary equipment waste heat utilization loop.

[0009] In one possible implementation, the dual-effect absorption combined cooling and heating system further includes a fourth circulating pump, which is installed on the circulating water pipe between the first cold source heat exchanger and the second cold source heat exchanger. The heat dissipation circulation return end is connected to the heat dissipation circulation outlet end through the circulating water pipe and via the first cold source heat exchanger, the fourth circulating pump, and the second cold source heat exchanger, forming a heat dissipation circulation water loop. The method further includes: driving the fourth circulating pump in the heating cycle; and transferring the waste heat absorbed from the auxiliary equipment that cannot be utilized by the evaporator to the heat dissipation circulation water loop through the second cold source heat exchanger.

[0010] In one possible implementation, the cooling cycle is completed as follows: The second and third terminals of the first three-way switch are respectively controlled to be in the ON state, and the first and third terminals of the second three-way valve are respectively controlled to be in the ON state, to connect the heat source steam cooling circuit; the heat source steam cooling circuit is used to remove the heat corresponding to the heat source steam generated by the nuclear power plant equipment; The second and third terminals of the first four-way valve are respectively controlled to be in the ON state, and the first and fourth terminals of the second four-way valve are respectively controlled to be in the ON state, to connect the cooling water supply circuit; the cooling water supply is supplied through the first four-way valve. The chilled water input at the cold return water end is transferred to the evaporator; the evaporator is operated so that the liquid refrigerant inside the evaporator absorbs heat from the chilled water and evaporates into gaseous refrigerant; the second circulation pump and the third circulation pump are driven to output the chilled water flowing out of the evaporator through the first and fourth ends of the second four-way valve to the chilled water output end; the first and fourth ends of the first four-way valve and the third and second ends of the second four-way valve are controlled to be in the on state respectively to connect the auxiliary equipment waste heat dissipation circuit; the waste heat energy generated by the operation of the auxiliary heat dissipation equipment of the nuclear power plant is recovered through the auxiliary equipment waste heat dissipation circuit.

[0011] In one possible implementation, the heat corresponding to the heat source steam generated by the nuclear power plant equipment is removed in the following way: Circulating water input from the third end of the first three-way valve is input into the absorber through the second end of the first three-way valve; the absorber absorbs the gaseous refrigerant from the evaporator to release energy into the circulating water, generating a low-concentration refrigerant; the circulating water output from the absorber is transported to the condenser by the first circulating pump; the low-pressure refrigerant vapor is condensed in the condenser to release heat to the circulating water flowing through the condenser; the condensed liquid refrigerant is depressurized by the fifth throttle valve and flows into the evaporator, and the circulating water that has absorbed the condensation heat is sequentially transported to the first cold source heat exchanger through the second three-way valve; the circulating water is heat exchanged through the first cold source heat exchanger, transferring the heat in the circulating water to the heat dissipation circulating water loop and transporting the cooled circulating water to the third end of the first three-way valve to form a circulating return water; the heat dissipation circulating water loop completes the heat dissipation of the heat source steam.

[0012] In one possible implementation, waste heat energy generated by the operation of auxiliary heat dissipation equipment in a nuclear power plant is recovered by: absorbing production waste heat from the auxiliary equipment through circulating water flowing into the auxiliary equipment heat exchanger; conveying the circulating water output from the auxiliary equipment heat exchanger sequentially through the first end of the first four-way valve, the fourth end of the first four-way valve, the third end of the second four-way valve, and the fourth end of the second four-way valve to a second cold source heat exchanger; and transferring the auxiliary equipment production waste heat carried in the circulating water to the heat dissipation circulating water loop through the second cold source heat exchanger, so as to reuse the auxiliary equipment production waste heat through the heat dissipation circulating water loop.

[0013] In one possible implementation, the method further includes: determining whether the ambient temperature is less than or equal to a second temperature threshold; if the ambient temperature is less than or equal to the second temperature threshold, then using the antifreeze as circulating water in the auxiliary equipment waste heat utilization circuit, the auxiliary equipment waste heat dissipation circuit, and the cooling water supply circuit.

[0014] Secondly, this application also provides a dual-effect absorption combined cooling and heating system. The dual-effect absorption combined cooling and heating system includes a high-pressure generator, an absorber, a condenser, an evaporator, a low-pressure generator, a heat exchanger group, auxiliary equipment heat exchangers, a first heat exchanger, a second heat exchanger, a first three-way valve, a second three-way valve, a first four-way valve, and a second four-way valve. The high-pressure generator is connected to the heat source steam provided by the nuclear power plant via a steam pipeline. The high-pressure generator is connected to the absorber via the heat exchanger group. A solution pipeline is provided between the high-pressure generator, the heat exchanger group, and the absorber. The high-pressure generator, the low-pressure generator, and the condenser are sequentially connected via steam pipelines. The low-pressure generator is connected to the heat exchanger group via a solution pipeline and then connected to the absorber via a solution pipeline within the heat exchanger group. The condenser and evaporator are connected via a solution pipeline. The evaporator and absorber are connected via a... The system is connected via a steam pipeline. The first three-way valve is sequentially connected to the absorber, the first circulating pump, the condenser, and the second three-way valve via a circulating water pipeline. The second three-way valve is also connected to the heating outlet and, via the circulating water pipeline, to the first three-way valve through the first heat exchanger. The cooling return water is connected to the cooling inlet via the circulating water pipeline, via the first heat exchanger and the second heat exchanger. The auxiliary equipment heat exchanger forms a circulating water loop with the first four-way valve, the evaporator, the second four-way valve, and the second heat exchanger via the circulating water pipeline. The first four-way valve is also connected to the cooling return water and the second four-way valve. The second four-way valve is also connected to the cooling end. The auxiliary equipment heat exchanger also absorbs the heat generated by the auxiliary equipment of the nuclear power plant via the circulating water pipeline through the equipment preheating absorption pipeline. The dual-effect absorption combined cooling and heating system also includes a processor, which runs the thermal management method provided in any of the above embodiments.

[0015] This application provides a thermal management method based on a dual-effect absorption combined cooling and heating system, comprising: initiating the dual-effect generation process of a high-pressure generator and a low-pressure generator; detecting the ambient temperature inside the plant; if the current temperature of the plant is less than a first temperature threshold, controlling the first three-way valve, the second three-way valve, the first four-way valve, and the second four-way valve to switch to heating operation mode respectively, so as to connect the hot water supply circuit and the auxiliary equipment waste heat utilization circuit respectively, completing the heating cycle; if the current temperature of the plant is greater than the first temperature threshold, controlling the first three-way valve, the second three-way valve, the first four-way valve, and the second four-way valve to switch to cooling operation mode respectively, so as to connect the heat source steam heat dissipation circuit, the auxiliary equipment waste heat dissipation circuit, and the cooling water supply circuit respectively, completing the cooling cycle. This application improves the energy utilization efficiency of nuclear power plant equipment by absorbing the energy from the heat source steam generated by the high and low pressure generators.

[0016] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This illustration shows one of the structural schematic diagrams of a dual-effect absorption combined cooling and heating system provided in an embodiment of this application;

[0019] Figure 2 A flowchart illustrating the steps of a thermal management method based on a dual-effect absorption combined cooling and heating system provided in an embodiment of this application is shown.

[0020] Figure 3 This is shown as a second schematic diagram of a dual-effect absorption combined cooling and heating system provided in an embodiment of this application. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. It should be understood that the drawings in this application are for illustrative and descriptive purposes only and are not intended to limit the scope of protection of this application. Furthermore, it should be understood that the schematic drawings are not drawn to scale. The flowcharts used in this application illustrate operations implemented according to some embodiments of this application. It should be understood that the operations in the flowcharts may not be implemented in sequence, and steps without logical contextual relationships may be reversed or implemented simultaneously. In addition, those skilled in the art, guided by the content of this application, may add one or more other operations to the flowcharts, or remove one or more operations from the flowcharts.

[0022] Furthermore, the described embodiments are merely some, not all, of the embodiments of this application. The components of the embodiments of this application described and illustrated herein can typically be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0023] The cooling and heating needs of existing nuclear power plants are typically met by two parts: the Hot and Cold Water Production and Distribution System (SES) and the Conventional Island Closed Cooling Water System (SRI). The working principle of the SES is that in the cold season, heat is absorbed from the high-temperature steam (greater than 150°C) generated by the nuclear power equipment through water as a medium, and hot water at 60-70°C is supplied to the plant. In the hot season, electricity is consumed to generate 7°C cooling water through compression refrigeration, which is supplied to key equipment for cooling. In the existing technology, the cooling and heating cycles are independent, and the cooling and heating needs are met separately in different seasons.

[0024] In other words, for the heating process achieved by the existing hot and cold water production and distribution system, on the one hand, an independent low-temperature heat source is required to provide energy for the evaporator to work, resulting in energy waste and increased costs. On the other hand, the existing heating process only absorbs the heat source steam of the nuclear power plant through a single generator, which means that the heat source steam of the nuclear power plant cannot be completely absorbed and is affected by different refrigerant solutions, resulting in the refrigerant solution not being fully recycled and reused, further causing resource waste.

[0025] Based on this, this application provides a thermal management method based on a dual-effect absorption combined cooling and heating system. This method improves the energy utilization efficiency of nuclear power plant equipment by combining high- and low-pressure generators to absorb energy from the heat source steam generated by nuclear power plant equipment. Specifically, the method is as follows:

[0026] Please see Figure 1 , Figure 1 This illustration shows one of the structural schematic diagrams of a dual-effect absorption combined cooling and heating system provided in an embodiment of this application. Figure 1 As shown, the dual-effect absorption combined cooling and heating system provided in this application includes a high-pressure generator 1, an absorber 2, a condenser 3, an evaporator 4, a low-pressure generator 5, a heat exchanger group 9, an auxiliary equipment heat exchanger 8, a first cold source heat exchanger 6, a second cold source heat exchanger 7, a first three-way valve Q1, a second three-way valve Q2, a first four-way valve K1, and a second four-way valve K2.

[0027] Preferably, the high-pressure generator 1 is connected to the heat source steam provided by the nuclear power plant equipment through a steam pipeline. The high-pressure generator 1 is connected to the absorber 2 through the heat exchanger group 9. A solution pipeline is provided between the high-pressure generator 1, the heat exchanger group 9 and the absorber 2. The high-pressure generator 1, the low-pressure generator 5 and the condenser 3 are connected in sequence through steam pipelines. The low-pressure generator 5 is connected to the heat exchanger group 9 through a solution pipeline and is connected to the absorber 2 through a solution pipeline in the heat exchanger group 9. The condenser 3 and the evaporator 4 are connected through a solution pipeline. The evaporator 4 and the absorber 2 are connected through a steam pipeline.

[0028] The first three-way valve Q1 is sequentially connected to the absorber 2, condenser 3 and the second three-way valve Q2 through the circulating water pipeline. The second three-way valve Q2 is also connected to the heating outlet and connected to the first three-way valve Q1 through the first cold source heat exchanger via the circulating water pipeline. The auxiliary equipment heat exchanger 8 is connected to the first four-way valve K1, evaporator 4, second four-way valve K2 and the second cold source heat exchanger through the circulating water pipeline. The first four-way valve K1 is also connected to the cooling return water and the second four-way valve K2. The second four-way valve K2 is also connected to the cooling end. The auxiliary equipment heat exchanger 8 also absorbs waste heat from the nuclear power plant's auxiliary equipment through the circulating water pipeline.

[0029] Please see Figure 2 , Figure 2 A flowchart illustrating the steps of a thermal management method based on a dual-effect absorption combined cooling and heating system provided in an embodiment of this application is shown. Figure 2 As shown, the method includes:

[0030] S100, start the dual-effect generation process of the high-voltage generator and the low-voltage generator.

[0031] S200, Detects the ambient temperature inside the factory.

[0032] S300 If the current temperature of the plant is less than the first temperature threshold, control the first three-way valve, the second three-way valve, the first four-way valve and the second four-way valve to switch to the heating operation state respectively, so as to connect the hot water supply circuit and the auxiliary equipment waste heat utilization circuit respectively.

[0033] S400: The heating cycle is completed by connecting the hot water supply circuit and the waste heat utilization circuit of the auxiliary equipment.

[0034] Among them, such as Figure 1 As shown, the hot water supply circuit is a circulating water circuit formed by the heating return water end, the first three-way valve Q1, the absorber 2, the condenser 3, the second three-way valve Q2, and the heating output end. The auxiliary equipment waste heat utilization circuit is a circulating water circuit formed between the auxiliary equipment heat exchanger 8, the first four-way valve K1, the evaporator 4, the second four-way valve K2, and the second cold source heat exchanger 7.

[0035] S500 If the current temperature of the plant is greater than the first temperature threshold, control the first three-way valve, the second three-way valve, the first four-way valve and the second four-way valve to switch to the cooling operation state respectively, so as to connect the heat source steam heat dissipation circuit, the auxiliary equipment waste heat dissipation circuit and the cooling water circuit.

[0036] Among them, such as Figure 1 As shown, the heat source steam heat dissipation circuit is a circulating water circuit between the first three-way valve Q1, absorber 2, condenser 3, second three-way valve Q2 and first cold source heat exchanger 6. The auxiliary equipment waste heat dissipation circuit is a circulating water circuit between the auxiliary equipment heat exchanger 8, first four-way valve K1, second four-way valve K2 and second cold source heat exchanger 7. The cooling water circuit is a circulating water circuit formed by the cooling water return end, first four-way valve K1, evaporator 4, second four-way valve K2 and cooling output end.

[0037] The S600 utilizes a heat source steam cooling circuit, an auxiliary equipment waste heat cooling circuit, and a cooling water supply circuit to complete the cooling cycle.

[0038] Specifically, in steps S100 to S600, the cascaded high-pressure generator 1 and low-pressure generator 5 absorb heat from the heat source steam in stages, which can effectively improve the utilization and heat dissipation efficiency of the heat source steam in the heating and cooling cycles. In addition, the cooling of traditional SES is achieved through compression refrigeration, which adds a separate refrigeration device and consumes a lot of electrical energy, resulting in energy waste and increased costs. However, the dual-effect absorption combined cooling and heating system provided in this application connects SES and SRI into a whole, and provides low-temperature energy to the evaporator by absorbing the waste heat generated by the nuclear power equipment, avoiding the waste of waste heat generated by the auxiliary equipment of the nuclear power plant and improving energy utilization.

[0039] In one possible implementation, please refer to Figure 3 , Figure 3 This is a second schematic diagram of a dual-effect absorption combined cooling and heating system provided in an embodiment of this application. (See attached diagram.) Figure 3As shown, the heat exchanger group 9 includes a first heat exchanger 91 and a second heat exchanger 92. The double-effect absorption combined cooling and heating system also includes a solution pump P1, a first throttle valve V1, a second throttle valve V2, a third throttle valve V3, a fourth throttle valve V4, and a first circulating pump R1.

[0040] Preferably, the high-pressure generator 1 is connected to the absorber 2 via a solution pipeline, passing through the first heat exchanger 91, the second heat exchanger 92, and the solution pump P1 in sequence. The high-pressure generator 1 is also connected to the absorber 2 via a solution pipeline, passing through the first heat exchanger 91, the second throttle valve V2, the second heat exchanger 92, and the first throttle valve V1 in sequence. One solution pipeline from the low-pressure generator 5 is connected to the solution pipeline between the first heat exchanger 91 and the second heat exchanger 92 via the third throttle valve V3. The other solution pipeline from the low-pressure generator 5 is connected to the solution pipeline between the second throttle valve V2 and the second heat exchanger 92. A fourth throttle valve V4 is installed on the solution pipeline between the condenser 3 and the low-pressure generator 5.

[0041] In a preferred embodiment, the dual-effect process includes:

[0042] High-pressure refrigerant vapor and a concentrated absorbent solution are generated by the refrigerant solution in high-pressure generator 1 absorbing heat from the heat source steam. The high-pressure refrigerant vapor is then fed into low-pressure generator 5 through a steam pipe. The high-pressure refrigerant vapor is cooled by the dilute absorbent solution in low-pressure generator 5, resulting in low-pressure refrigerant vapor and a concentrated absorbent solution. The low-pressure refrigerant vapor flows into condenser 3 through the fourth throttle valve V4 for further cooling and condensation. The concentrated absorbent solution in high-pressure generator 1 is then passed through the first heat exchanger 91 and the second throttle valve V4. 2. The second heat exchanger 92 and the first throttle valve V1 are used to input the concentrated absorbent solution in the low-pressure generator 5 into the absorber 2. The solution pump P1 pressurizes the dilute absorbent solution generated by the absorption in the absorber 2. A portion of the pressurized dilute absorbent solution output from the solution pump P1 is returned to the high-pressure generator 1 through the second heat exchanger 92 and the first heat exchanger 91, while the other portion of the dilute absorbent solution is returned to the low-pressure generator 5 through the second heat exchanger 92 and the third throttle valve V3.

[0043] In one specific embodiment, this application achieves the absorption of heat from heat source steam by cascading high-pressure generator 1 and low-pressure generator 1. On the one hand, it improves the heat extraction efficiency of heat source steam and increases energy utilization. On the other hand, it can also achieve full recycling of refrigerant solution and avoid resource waste.

[0044] like Figure 2As shown, a fifth throttle valve V5 is installed on the solution pipeline between condenser 3 and evaporator 4, a first circulation pump R1 is installed on the circulation pipeline connecting absorber 2 and condenser 3, a second circulation pump R2 is installed between evaporator 4 and second four-way valve K2, and a third circulation pump R3 is installed between second four-way valve K2 and second cold source heat exchanger 7.

[0045] In a preferred embodiment, the heating cycle is completed in the following manner:

[0046] The first terminal a of the first three-way switch Q1 and the second terminal c of the first three-way switch Q2 are respectively controlled to be in the on state, and the first terminal d of the second three-way valve Q2 and the third terminal e of the second three-way valve Q2 are respectively controlled to be in the on state, so that the hot water supply circuit is connected. The heating circulation water flows into the absorber 2 through the first three-way switch Q1. The absorber 2 absorbs the gaseous refrigerant from the evaporator 4 to release energy into the heating circulation water, and generates a low concentration of refrigerant in the absorber 2. The heating circulation water output from the absorber 2 is transported to the condenser 3 through the first circulation pump R1. The low-pressure refrigerant vapor is condensed in the condenser 3 to release heat to the heating circulation water flowing through the condenser 3. The condensed liquid refrigerant is depressurized through the fifth throttle valve V5 and flows into the evaporator 4. The heating circulation water that has absorbed the condensation heat is transported to the heating output end through the second three-way valve Q2.

[0047] Control the first four-way valve K1 and the second four-way valve K2 to be in the heating operation state so that the waste heat utilization circuit of the auxiliary equipment is connected. The waste heat utilization circuit of the auxiliary equipment provides a low temperature heat source to the evaporator 4. Under the energy of the low temperature heat source, the liquid refrigerant is evaporated by the evaporator 4 to generate gaseous refrigerant. The gaseous refrigerant is then input into the absorber 2 through the steam pipe to complete the heating cycle.

[0048] In one specific embodiment, during the heating cycle, a low-temperature heat source is provided to the evaporator in the following manner:

[0049] The first terminal i and the second terminal g of the first four-way valve K1 and the first terminal k and the second terminal m of the second four-way valve K2 are respectively controlled to be in the closed state, so that the waste heat utilization circuit of the auxiliary equipment is connected. The waste heat generated by the auxiliary equipment of the nuclear power plant is absorbed by the auxiliary equipment heat exchanger 8 and transferred to the cooling water flowing through the auxiliary equipment heat exchanger 8. The cooling water output from the auxiliary equipment heat exchanger 8 is transferred to the evaporator 4 through the first terminal i and the second terminal g of the first four-way valve K1, so that the liquid refrigerant in the evaporator 4 evaporates into gaseous refrigerant by absorbing heat from the cooling water. The second circulation pump R2 and the third circulation pump R3 drive the cooling water flowing out of the evaporator 4 to flow back to the auxiliary equipment heat exchanger 8 through the first terminal k of the second four-way valve K2, the second terminal m of the second four-way valve K2 and the second cold source heat exchanger 7, thus completing the supply of the low temperature heat source required by the evaporator to the auxiliary equipment waste heat utilization circuit.

[0050] In another preferred embodiment, such as Figure 2 As shown, the dual-effect absorption combined cooling and heating system also includes a fourth circulation pump R4. The fourth circulation pump R4 is installed on the circulating water pipe between the first cold source heat exchanger 6 and the second cold source heat exchanger 7. The heat dissipation circulation return water end is connected to the heat dissipation circulation outlet end through the circulating water pipe and through the first cold source heat exchanger 6, the fourth circulation pump R4 and the second cold source heat exchanger 7, forming a heat dissipation circulation water loop.

[0051] Specifically, the methods also include:

[0052] In the heating cycle, the fourth circulating pump R4 is driven to transfer the waste heat that the evaporator 4, which is not usable by the auxiliary equipment, to the heat dissipation circulating water circuit through the second cold source heat exchanger 7.

[0053] Specifically, when the dual-effect absorption combined cooling and heating system of this application is operating in heating mode, it uses an absorption heat pump to cycle and utilizes high-temperature steam to drive a high-pressure generator. The evaporator absorbs heat and utilizes the low-temperature waste heat of the auxiliary equipment, which increases the heat capacity compared with direct steam heating. On the other hand, the waste heat from the auxiliary equipment is absorbed by the evaporator, and the circulating water is cooled down before being discharged into the circulating working fluid in the heat dissipation circulating water loop through the first cold source heat exchanger and the second cold source heat exchanger, which reduces the impact of heat dissipation on the environment. The circulating working fluid in the heat dissipation circulating water loop can be seawater.

[0054] In a preferred embodiment, the cooling cycle is completed in the following manner:

[0055] The second terminal c and the third terminal b of the first three-way switch Q1 are respectively controlled to be in the closed state, and the first terminal d and the third terminal f of the second three-way valve Q2 are respectively controlled to be in the closed state, so as to connect the heat source steam heat dissipation circuit. The heat source steam heat dissipation circuit is used to remove the heat corresponding to the heat source steam generated by the nuclear power plant equipment. The second terminal g and the third terminal h of the first four-way valve K1 are respectively controlled to be in the closed state, and the first terminal k and the fourth terminal n of the second four-way valve K2 are respectively controlled to be in the closed state, so as to connect the cooling water circuit. The cooling water input from the cooling water return end is transferred to the evaporator 4 through the first four-way valve K1. The evaporator 4 is operated so that the liquid refrigerant in the evaporator 4 absorbs the heat in the cooling water and evaporates into gaseous refrigerant. The second circulation pump R2 and the third circulation pump R3 are driven to output the cooling water flowing out of the evaporator 4 through the first terminal k and the fourth terminal n of the second four-way valve K2 to the cooling output end.

[0056] The first terminal i and the fourth terminal j of the first four-way valve K1 are respectively controlled to be in the on state, and the third terminal l and the second terminal m of the second four-way valve K2 are respectively controlled to be in the on state, so as to connect the waste heat dissipation circuit of the auxiliary equipment, and recover the waste heat energy generated by the operation of the auxiliary heat dissipation equipment of the nuclear power plant through the connection of the waste heat dissipation circuit of the auxiliary equipment.

[0057] In a preferred embodiment, during the cooling process, the heat corresponding to the heat source steam generated by the nuclear power plant equipment is removed in the following manner:

[0058] The circulating water input from the third end b of the first three-way valve Q1 is fed into the absorber 2 via the second end c of the first three-way valve Q1. The absorber 2 absorbs the gaseous refrigerant from the evaporator 4 to release energy into the circulating water, generating a low-concentration refrigerant. The circulating water output from the absorber 2 is then transported to the condenser 3 via the first circulating pump R1. The condenser 3 condenses the low-pressure refrigerant vapor to release heat to the circulating water flowing through it. The condensed liquid refrigerant is depressurized by the fifth throttle valve V5 and flows into the evaporator. The circulating water that has absorbed the condensation heat is then transported to the first cold source heat exchanger 6 via the second three-way valve Q2. The first cold source heat exchanger 6 exchanges heat with the circulating water, transferring the heat in the circulating water to the heat dissipation circulating water loop. The cooled circulating water is then transported back to the third end b of the first three-way valve Q1 to form a circulating return water loop. The heat dissipation circulating water loop is used to dissipate heat from the heat source vapor.

[0059] In a preferred embodiment, waste heat energy generated during the operation of auxiliary cooling equipment in a nuclear power plant is recovered in the following manner:

[0060] The circulating water flowing into the auxiliary equipment heat exchanger 8 absorbs the production waste heat from the nuclear power plant's auxiliary equipment. The circulating water output from the auxiliary equipment heat exchanger 8 is sequentially transported through the first end i of the first four-way valve K1, the fourth end j of the first four-way valve K1, the third end l of the second four-way valve K2, and the fourth end m of the second four-way valve K2 to the second cold source heat exchanger 7. The second cold source heat exchanger 7 transfers the auxiliary equipment production waste heat carried in the circulating water to the heat dissipation circulating water circuit, so as to reuse or dissipate the auxiliary equipment production waste heat through the heat dissipation circulating water circuit.

[0061] The dual-effect absorption combined cooling and heating system provided in this application, when operating in cooling mode, also uses high-temperature steam as the driving force to output cooling capacity from the evaporator to achieve the cooling effect, while discharging the heat generated in the absorber and condenser together with the waste heat of the auxiliary equipment, making full use of the original heat dissipation requirements of the auxiliary equipment, and making the overall system simpler and more compact.

[0062] In a preferred embodiment, the method further includes:

[0063] Determine whether the ambient temperature is less than or equal to the second temperature threshold. If the ambient temperature is less than or equal to the second temperature threshold, then use the antifreeze as the circulating water in the auxiliary equipment waste heat utilization circuit, the auxiliary equipment waste heat dissipation circuit, and the cooling water supply circuit.

[0064] Specifically, the circulating working fluid in the auxiliary equipment waste heat utilization circuit, the auxiliary equipment waste heat dissipation circuit, and the cooling water circuit is usually water. When the ambient temperature is less than or equal to the second temperature threshold, and the ambient temperature is determined to be low enough to cause freezing, the circulating working fluid in the auxiliary equipment waste heat utilization circuit, the auxiliary equipment waste heat dissipation circuit, and the cooling water circuit needs to be replaced with antifreeze.

[0065] Preferably, in a dual-effect absorption combined cooling and heating system, commonly used absorption refrigerant pairs are used as absorbent and refrigerant, such as lithium bromide-water pair, calcium chloride-water pair, water-ammonia pair, etc.

[0066] In another possible implementation, the working fluid in the cooling cycle that supplies cold energy to the cold end and the heating cycle that supplies heat energy to the hot end is usually water, but it can be replaced with other working fluids according to actual operating needs.

[0067] In a preferred embodiment, the internal operating pressure and operating temperature of the dual-effect absorption combined cooling and heating system can be adjusted by setting the solution concentration and circulation ratio of the refrigerant pair. That is, the optimal solution concentration and circulation ratio are obtained by optimizing calculations based on the required temperature, equipment operating pressure range and efficiency, thereby controlling the operation of the dual-effect absorption combined cooling and heating system.

[0068] In another preferred embodiment, the flow rate is set to match the flow rates of the cooling cycle, heating cycle, and the circulating water in the heat source steam and heat dissipation circulating water circuits. That is, during the heating process, the flow rate of the introduced auxiliary steam is adjusted to match the power of the high-temperature heat source with the heating power and the power of the low-temperature heat source. During the cooling process, the power of the high-temperature heat source is matched with the cooling power, and the temperature of the circulating water in the heat dissipation circulating water circuit is matched with the condensing temperature inside the condenser and the absorption temperature inside the absorber.

[0069] In a preferred embodiment, by allocating the flow rates of the double-effect absorption refrigeration cycle into the high-pressure generator and the low-pressure generator, the condensation heat of the refrigerant generated at the high-pressure generator is matched with the heat absorption required by the low-pressure generator.

[0070] The dual-effect absorption combined cooling and heating system provided in this application also includes various detection devices and control systems for measuring the temperature of the cold source, heat source, cold end, heat end, auxiliary equipment, as well as the temperature and pressure of each piece of equipment and pipeline during operation. At the same time, it adjusts various operating parameters of the dual-effect absorption system according to the cooling and heating needs of the nuclear power plant.

[0071] The dual-effect absorption combined cooling and heating system provided by the applicant also includes a processor, which runs the thermal management method provided in any of the above embodiments.

[0072] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems and devices described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here. In the several embodiments provided in this application, it should be understood that the disclosed systems, devices, and methods can be implemented in other ways. The device embodiments described above are merely illustrative. For example, the division of units is only a logical functional division; in actual implementation, there may be other division methods. Furthermore, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Another point is that the displayed or discussed mutual coupling or direct coupling or communication connection may be through some communication interfaces; the indirect coupling or communication connection of devices or units may be electrical, mechanical, or other forms.

[0073] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0074] In addition, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit.

[0075] If the aforementioned functions are implemented as software functional units and sold or used as independent products, they can be stored in a processor-executable, non-volatile, computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0076] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A thermal management method based on a dual-effect absorption combined cooling and heating system, characterized in that, The dual-effect absorption combined cooling and heating system includes a high-pressure generator, an absorber, a condenser, an evaporator, a low-pressure generator, a heat exchanger assembly, auxiliary equipment heat exchangers, a first cold source heat exchanger, a second cold source heat exchanger, a first three-way valve, a second three-way valve, a first four-way valve, and a second four-way valve. The high-pressure generator is connected to the heat source steam provided by the nuclear power plant equipment via a steam pipeline. The high-pressure generator is connected to the absorber via a heat exchanger assembly. A solution pipeline connects the high-pressure generator, the heat exchanger assembly, and the absorber. The high-pressure generator, the low-pressure generator, and the condenser are sequentially connected via steam pipelines. The low-pressure generator is connected to the heat exchanger assembly via a solution pipeline and then connected to the absorber via a solution pipeline within the heat exchanger assembly. The condenser and evaporator are connected via a solution pipeline, and the evaporator and absorber are connected via a steam pipeline. The first three-way valve is sequentially connected to the absorber, condenser, and second three-way valve via circulating water pipelines. The second three-way valve is also connected to the heating water outlet and, via circulating water pipelines, to the first three-way valve through the first cold source heat exchanger. The auxiliary equipment heat exchanger is connected to the first four-way valve, evaporator, second four-way valve, and second cold source heat exchanger via circulating water pipelines. The first four-way valve is also connected to the cooling water return end and the second four-way valve. The second four-way valve is also connected to the cooling end. The auxiliary equipment heat exchanger also absorbs waste heat from the nuclear power plant's auxiliary equipment via circulating water pipelines. The method includes: Start the dual-effect generation process of the high-voltage generator and the low-voltage generator; Detect the ambient temperature inside the factory building; If the current temperature of the plant is lower than the first temperature threshold, the first three-way valve, the second three-way valve, the first four-way valve, and the second four-way valve are switched to the heating operation state respectively, so as to connect the hot water supply circuit and the auxiliary equipment waste heat utilization circuit respectively. The hot water supply circuit is a circulating water circuit formed by the heating return water end, the first three-way valve, the absorber, the condenser, the second three-way valve, and the heating output end. The auxiliary equipment waste heat utilization circuit is a circulating water circuit formed between the auxiliary equipment heat exchanger, the first four-way valve, the evaporator, the second four-way valve, and the second cold source heat exchanger. The heating cycle is completed by connecting the hot water supply circuit and the waste heat utilization circuit of auxiliary equipment; If the current temperature of the plant is greater than the first temperature threshold, the first three-way valve, the second three-way valve, the first four-way valve, and the second four-way valve are switched to the cooling operation state to connect the heat source steam heat dissipation circuit, the auxiliary equipment waste heat dissipation circuit, and the cooling water circuit. The heat source steam heat dissipation circuit is the circulating water circuit between the first three-way valve, the absorber, the condenser, the second three-way valve, and the first cold source heat exchanger. The auxiliary equipment waste heat dissipation circuit is the circulating water circuit between the auxiliary equipment heat exchanger, the first four-way valve, the second four-way valve, and the second cold source heat exchanger. The cooling water circuit is the circulating water circuit formed by the cooling return water end, the first four-way valve, the evaporator, the second four-way valve, and the cooling output end. The cooling cycle is completed by utilizing the heat source steam heat dissipation circuit, the auxiliary equipment waste heat dissipation circuit, and the cooling water supply circuit; The heat exchanger assembly includes a first heat exchanger and a second heat exchanger. The double-effect absorption combined cooling and heating system also includes a solution pump, a first throttling valve, a second throttling valve, a third throttling valve, a fourth throttling valve, and a first circulating pump. The high-pressure generator is connected to the absorber via a solution pipeline, passing sequentially through a first heat exchanger, a second heat exchanger, and a solution pump. The high-pressure generator is also connected to the absorber via a solution pipeline, passing sequentially through a first heat exchanger, a second throttle valve, a second heat exchanger, and a first throttle valve. One solution pipeline from the low-pressure generator connects to the solution pipeline between the first and second heat exchangers via a third throttle valve. Another solution pipeline from the low-pressure generator connects to the solution pipeline between the second throttle valve and the second heat exchanger. A fourth throttle valve is installed on the solution pipeline between the condenser and the low-pressure generator. The dual-effect process includes: The refrigerant solution in the high-pressure generator absorbs heat from the heat source steam to generate high-pressure refrigerant vapor and form a concentrated absorbent solution. The high-pressure refrigerant vapor is introduced into the low-pressure generator through a solution pipeline; The high-pressure refrigerant vapor is subjected to heat absorption treatment by the dilute absorbent solution in the low-pressure generator, and low-pressure refrigerant vapor and concentrated absorbent solution are generated. The low-pressure refrigerant vapor flows into the condenser through the fourth throttle valve; The concentrated absorbent solution in the high-pressure generator is fed into the absorber through the first heat exchanger, the second throttle valve, the second heat exchanger, and the first throttle valve; The concentrated absorbent solution in the low-pressure generator is fed into the absorber through the second heat exchanger and the first throttle valve; The dilute absorbent solution produced by the absorption process in the absorber is pressurized by a solution pump; A portion of the pressurized absorbent dilute solution output from the solution pump is returned to the high-pressure generator through the second heat exchanger and the first heat exchanger, while another portion of the absorbent dilute solution is returned to the low-pressure generator through the second heat exchanger and the third throttle valve. A fifth throttle valve is installed on the solution pipeline between the condenser and the evaporator; a first circulation pump is installed on the circulation pipeline connecting the absorber and the condenser; a second circulation pump is installed between the evaporator and the second four-way valve; and a third circulation pump is installed between the second four-way valve and the second cold source heat exchanger. The heating cycle is completed in the following ways: The first and second terminals of the first three-way switch are respectively controlled to be in the ON state, and the first and third terminals of the second three-way valve are respectively controlled to be in the ON state, so as to make the hot water supply circuit open. The heating circulating water flows into the absorber through the first three-way switch; The gaseous refrigerant from the evaporator is absorbed by the absorber to release energy into the heating circulating water, generating a low-concentration refrigerant. The heating circulating water output from the absorber is delivered to the condenser via the first circulation pump; The low-pressure refrigerant vapor is condensed by the condenser to release heat to the heating circulation water flowing through the condenser. The condensed liquid refrigerant is depressurized by the fifth throttle valve and flows into the evaporator. The heating circulation water that absorbs the heat of condensation is delivered to the heating output end through the second three-way valve. Control the first four-way valve and the second four-way valve to be in heating operation mode so that the waste heat utilization circuit of the auxiliary equipment is connected; The waste heat utilization circuit of the auxiliary equipment provides a low-temperature heat source for the evaporator. Under the energy of the low-temperature heat source, the liquid refrigerant is evaporated by the evaporator to generate gaseous refrigerant, and the gaseous refrigerant is introduced into the absorber through the steam pipe to complete the heating cycle; The evaporator is provided with a low-temperature heat source in the following manner: The first and second ends of the first four-way valve are respectively controlled to be in the on state, and the first and second ends of the second four-way valve are respectively controlled to be in the on state, so as to connect the waste heat utilization circuit of the auxiliary equipment. The waste heat generated by the auxiliary equipment of the nuclear power plant is absorbed by the auxiliary equipment heat exchanger and transferred to the cooling water flowing through the auxiliary equipment heat exchanger; The cooling water output from the auxiliary equipment heat exchanger is transmitted to the evaporator through the first and second ends of the first four-way valve, so that the liquid refrigerant in the evaporator can absorb heat from the cooling water and evaporate into gaseous refrigerant. Drive the second and third circulation pumps to return the cooling water flowing out of the evaporator to the auxiliary equipment heat exchanger via the first and second ends of the second four-way valve and the second cold source heat exchanger, thus completing the supply of the low-temperature heat source required by the evaporator through the auxiliary equipment waste heat utilization loop. The cooling cycle is completed in the following way: The second and third terminals of the first three-way switch are respectively controlled to be in the ON state, and the first and third terminals of the second three-way valve are respectively controlled to be in the ON state, so as to connect the heat source steam heat dissipation circuit. The heat source steam cooling circuit is used to remove the heat corresponding to the heat source steam generated by the nuclear power plant equipment. The second and third ends of the first four-way valve are respectively controlled to be in the on state, and the first and fourth ends of the second four-way valve are respectively controlled to be in the on state, so as to connect the cold water supply circuit. The cooling water input from the cooling water return end is transferred to the evaporator through the first four-way valve; The evaporator is operated so that the liquid refrigerant inside the evaporator absorbs heat from the cooling water and evaporates into gaseous refrigerant; Drive the second and third circulation pumps to output the cooling water flowing out of the evaporator to the cooling output terminal through the first and fourth terminals of the second four-way valve; The first and fourth ends of the first four-way valve are respectively controlled to be in the on state, and the third and second ends of the second four-way valve are respectively controlled to be in the on state, so as to connect the waste heat dissipation circuit of the auxiliary equipment. Waste heat energy generated by the operation of auxiliary cooling equipment in nuclear power plants can be recovered through waste heat dissipation loops in auxiliary equipment. The heat generated by the heat source steam from nuclear power plant equipment is removed in the following ways: The circulating water input from the third end of the first three-way valve is input into the absorber through the second end of the first three-way valve; The gaseous refrigerant from the evaporator is absorbed by the absorber to release energy into the circulating water, generating a low concentration of refrigerant. The circulating water output from the absorber is delivered to the condenser via the first circulation pump; The low-pressure refrigerant vapor is condensed by the condenser to release heat to the circulating water flowing through the condenser. The condensed liquid refrigerant is depressurized by the fifth throttle valve and flows into the evaporator. The circulating water that absorbs the heat of condensation is then transported to the first cold source heat exchanger through the second three-way valve. The circulating water is heated by the first cold source heat exchanger, which transfers the heat in the circulating water to the heat dissipation circulating water circuit and delivers the cooled circulating water to the third end of the first three-way valve to form a circulating return water. The heat source steam is cooled by a circulating water circuit.

2. The method according to claim 1, characterized in that, The dual-effect absorption combined cooling and heating system also includes a fourth circulating pump, which is installed on the circulating water pipeline between the first and second cold source heat exchangers. The heat dissipation circulation return water end is connected to the heat dissipation circulation outlet end through the circulating water pipeline, the first cold source heat exchanger, the fourth circulating pump, and the second cold source heat exchanger, forming a heat dissipation circulation water loop. The method further includes: In the heating cycle, the fourth circulation pump is driven; The waste heat that the evaporator cannot utilize, which is absorbed by the auxiliary equipment, is transferred to the heat dissipation circulating water circuit via the second cold source heat exchanger.

3. The method according to claim 1, characterized in that, Waste heat energy generated during the operation of auxiliary cooling equipment in nuclear power plants can be recovered through the following methods: Waste heat from nuclear power plant auxiliary equipment is absorbed by circulating water flowing into the heat exchanger of the auxiliary equipment. The circulating water output from the auxiliary equipment heat exchanger is sequentially transported to the second cold source heat exchanger through the first end of the first four-way valve, the fourth end of the first four-way valve, the third end of the second four-way valve, and the fourth end of the second four-way valve. The waste heat from the auxiliary equipment, carried in the circulating water, is transferred to the heat dissipation circulating water circuit via a second cold source heat exchanger, so that the waste heat from the auxiliary equipment can be reused through the heat dissipation circulating water circuit.

4. The method according to claim 1, characterized in that, The method further includes: Determine whether the ambient temperature is less than or equal to the second temperature threshold; If the ambient temperature is less than or equal to the second temperature threshold, the antifreeze will be used as circulating water in the auxiliary equipment waste heat utilization circuit, the auxiliary equipment waste heat dissipation circuit, and the cooling water supply circuit.

5. A dual-effect absorption combined cooling and heating system, characterized in that, The dual-effect absorption combined cooling and heating system includes a high-pressure generator, an absorber, a condenser, an evaporator, a low-pressure generator, a heat exchanger assembly, auxiliary equipment heat exchangers, a first cold source heat exchanger, a second cold source heat exchanger, a first three-way valve, a second three-way valve, a first four-way valve, and a second four-way valve. The high-pressure generator is connected to the heat source steam provided by the nuclear power plant equipment via a steam pipeline. The high-pressure generator is connected to the absorber via a heat exchanger assembly. A solution pipeline connects the high-pressure generator, the heat exchanger assembly, and the absorber. The high-pressure generator, the low-pressure generator, and the condenser are sequentially connected via solution pipelines. The low-pressure generator is connected to the heat exchanger assembly via a solution pipeline and then connected to the absorber via a solution pipeline within the heat exchanger assembly. The condenser and evaporator are connected via solution pipelines, and the evaporator and absorber are connected via steam pipelines. The first three-way valve is sequentially connected to the absorber, condenser, and second three-way valve via circulating water pipelines. The second three-way valve is also connected to the heating water outlet and, via circulating water pipelines, to the first three-way valve through the first cold source heat exchanger. The auxiliary equipment heat exchanger is connected to the first four-way valve, evaporator, second four-way valve, and second cold source heat exchanger via circulating water pipelines. The first four-way valve is also connected to the cooling water return end and the second four-way valve. The second four-way valve is also connected to the cooling end. The auxiliary equipment heat exchanger also absorbs waste heat from the nuclear power plant's auxiliary equipment via circulating water pipelines. The dual-effect absorption combined cooling and heating system further includes a processor, which runs the thermal management method of any one of claims 1-4.

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