Renewable energy driven absorption type combined cooling and heating system

Abstract

The invention relates to the technical field of absorption systems, and discloses an absorption type combined cooling and heating system driven by renewable energy sources. The absorption type combined cooling and heating system driven by the renewable energy sources comprises solution circulation, ammonia working medium circulation, a fuel gas-flue gas process, heat supply load circulation, cold supply load circulation, solar heat collection heat conduction oil circulation and generation heat conduction oil circulation. According to the renewable energy source driven absorption type combined cooling and heating system, renewable energy source driving is introduced, the cooling and heating requirements are met, combined energy supply of cooling and heating is achieved through one device, the utilization rate of renewable energy sources is increased, and the energy consumption is reduced. And then when the absorption type combined cooling and heating system operates, refrigeration temperature control, absorber liquid level control, generation temperature control, heat supply temperature control and heat source power control can be adopted to control the absorption type combined cooling and heating system driven by renewable energy sources, and the system can automatically adjust and efficiently operate along with environment temperature changes and heat supply power setting.

Description

Technical Field

[0001] The invention relates to the technical field of absorption systems, and in particular to an absorption combined cooling and heating system driven by renewable energy. Background Art

[0002] As the trend of global warming intensifies, countries around the world have proposed energy conservation and emission reduction development goals. Every year, the heating and cooling of buildings is a source of considerable carbon emissions. Due to the problem of my country's energy structure, electricity resources are currently mainly obtained by burning traditional fossil energy. Most of the building heating needs are met by boilers or electric heaters, but the burning of fossil fuels by boilers has the problem of greenhouse gas emissions, and the electric heating system has problems such as low electricity efficiency. The building cooling field is a great test for the power grid system under the huge cooling load in summer. In order to meet the cooling needs in summer, the power grid system also needs to pay high maintenance costs to ensure the reliability of operation.

[0003] At present, conventional boiler heating systems still face the problem of low system utilization. When the demand for heat is low in summer, the boiler heating system is almost stagnant. However, the huge peak power consumption of cooling capacity in summer places high demands on the power grid. The developing combined heating and cooling technology can alleviate this phenomenon, and only one unit can achieve the effect of heating in winter and cooling in summer.

[0004] The absorption system drives the introduction of renewable resources, such as solar energy. Since the solar energy power is unstable, gas supplementary combustion is required to ensure the stable and continuous heat drive supply of the absorption system. The gas absorption system introduces medium-pressure evaporation and medium-pressure absorption on the basis of the traditional single-effect absorption system, which can enhance the adaptability of the system at low temperature ambient temperature, improve the performance of the system at low temperature ambient temperature, make full use of the low-temperature flue gas waste heat recovered from the gas boiler, enhance the system solution heat recovery effect, and improve the system efficiency. However, the current absorption system renewable energy utilization rate is not high enough. Summary of the invention

[0005] Based on this, it is necessary to address the technical problems of the existing technology on how to improve the utilization rate of renewable energy and cleanly and efficiently obtain the heat and cold required by users in the combined heat and cold supply system, and propose a renewable energy driven absorption combined heat and cold supply system, which includes: solution circulation, ammonia working medium circulation, gas-flue gas process, heating load circulation, cooling load circulation, solar heat collection heat transfer oil circulation, and heat transfer oil circulation;

[0006] The solution circulation includes: the first outlet of the generator is connected to one end of the stop valve H1, a thermometer T1 is arranged between the first outlet of the generator and the stop valve H1, the other end of the stop valve H1 is connected to one end of the throttle valve LV6, the other end of the throttle valve LV6 is connected to the first inlet of the medium-pressure absorber, a pressure gauge P3 is arranged between the other end of the throttle valve LV6 and the first inlet of the medium-pressure absorber, the first outlet of the medium-pressure absorber is connected to one end of the throttle valve LV7, a thermometer T2 is arranged between the first outlet of the medium-pressure absorber and one end of the throttle valve LV7, the other end of the throttle valve LV7 is connected to the first inlet of the absorber, and the first outlet of the absorber is connected to One end of the solution pump is connected, a pressure gauge P5 and a thermometer T3 are arranged between the first outlet of the absorber and one end of the solution pump, the other end of the solution pump is connected to one end of the flowmeter F1, the other end of the flowmeter F1 is connected to one end of the check valve C1, the other end of the check valve C1 is connected to the first inlet of the rectifier, the first outlet of the rectifier is connected to the second inlet of the medium-pressure absorber, a thermometer T4 is arranged between the first outlet of the rectifier and the second inlet of the medium-pressure absorber, the second outlet of the medium-pressure absorber is connected to the first inlet of the generator, and a thermometer T5 is arranged between the second outlet of the medium-pressure absorber and the first inlet of the generator;

[0007] The ammonia working medium cycle includes: the second outlet of the generator is connected to the second inlet of the rectifier, the second outlet of the generator and the second inlet of the rectifier are provided with a pressure gauge P1, the second outlet of the rectifier is connected to the first inlet of the condenser, the first outlet of the condenser is connected to the first inlet of the subcooler, a thermometer T6 is provided between the first outlet of the condenser and the first inlet of the subcooler, the first outlet of the subcooler is connected to one end of the stop valve H2, the other end of the stop valve H2 is connected to one end of the throttle valve LV2, the other end of the throttle valve LV2 is connected to the first inlet of the medium-pressure evaporator, the first outlet of the medium-pressure evaporator is connected to the inlet of the separator, the first outlet of the medium-pressure evaporator is connected to A thermometer T7 and a pressure gauge P2 are provided between the inlets of the separator, the first outlet of the separator is connected to one end of the stop valve H3, the other end of the stop valve H3 is connected to one end of the check valve C2, the other end of the check valve C2 is connected to the first inlet of the medium-pressure absorber, the separator is provided with a liquid level gauge L2, the second outlet of the separator is connected to one end of the throttle valve LV1, the other end of the throttle valve LV1 is connected to the first inlet of the evaporator, a thermometer T8 and a pressure gauge P4 are provided between the other end of the throttle valve LV1 and the first inlet of the evaporator, the first outlet of the evaporator is connected to the second inlet of the subcooler, and the second outlet of the subcooler is connected to the second inlet of the absorber;

[0008] The gas-flue gas process includes a gas and air inlet connected to the first inlet of the thermal oil boiler, a flow meter F5 is provided at the gas and air inlet, a flow meter P5 is provided on the pipeline between the gas and air inlet and the first inlet of the thermal oil boiler, a first outlet of the thermal oil boiler is respectively connected to one end of the cooling flue gas pipeline and one end of the heating flue gas pipeline through a three-way ball valve TV5, the other end of the heating flue gas pipeline is connected to the second inlet of the medium-pressure evaporator, the second outlet of the medium-pressure evaporator is connected to the flue gas outlet, and a thermometer T19 is provided between the second outlet of the medium-pressure evaporator and the flue gas outlet;

[0009] The heating cycle includes a second outlet of the condenser connected to a third inlet of the absorber, a thermometer T17 is provided between the second outlet of the condenser and the third inlet of the absorber, the absorber is provided with a liquid level gauge L1, the second outlet of the absorber is connected to one end of a throttle valve LV8, a thermometer T16 is provided between the second outlet of the absorber and one end of the throttle valve LV8, the other end of the throttle valve LV8 is connected to one end of a flowmeter F4, the other end of the flowmeter F4 is connected to one end of a heating load, the other end of the heating load is connected to the second inlet of the condenser, and a thermometer T18 is provided between the other end of the heating load and the second inlet of the condenser;

[0010] The refrigeration cycle includes one end of the cooling load connected to the second inlet of the evaporator, a thermometer T14 is provided between the one end of the cooling load and the second inlet of the evaporator, the second outlet of the evaporator is connected to one end of the throttle valve LV9, a thermometer T15 is provided between the second outlet of the evaporator and one end of the throttle valve LV9, the other end of the throttle valve LV9 is connected to one end of a flow meter F3, and the other end of the flow meter F3 is connected to the other end of the cooling load;

[0011] The solar heat collection heat transfer oil circulation includes a first outlet of a plate heat exchanger connected to an inlet of a heat collection circulation pump, a thermometer T24 is provided between the first outlet of the plate heat exchanger and the inlet of the heat collection circulation pump, the outlet of the heat collection circulation pump is connected to one end of a flow meter F6, the other end of the flow meter F6 is connected to the inlet of a solar heat collector, a thermometer T21 is provided between the other end of the flow meter F6 and the inlet of the solar heat collector, the outlet of the solar heat collector is connected to the inlet of an electric tee TV4, a thermometer T22 is provided between the outlet of the solar heat collector and the inlet of the electric tee TV4, the first outlet of the electric tee TV4 is connected to the first inlet of the plate heat exchanger, the second outlet of the electric tee TV4 is connected to the inlet of a radiator, the outlet of the radiator is connected to the first inlet of the plate heat exchanger, and a thermometer T23 is provided at the first inlet of the plate heat exchanger;

[0012] The heat transfer oil circulation comprises that the second outlet of the heat transfer oil boiler is connected to the inlet of the circulation pump, a thermometer T13 is arranged between the second outlet of the heat transfer oil boiler and the inlet of the circulation pump, the outlet of the circulation pump is connected to one end of a flow meter F2, the other end of the flow meter F2 is connected to the second inlet of the generator, a thermometer T10 is arranged between the other end of the flow meter F2 and the second inlet of the generator, the third outlet of the generator is connected to the inlet of an electric tee TV3, a thermometer T11 is arranged between the third outlet of the generator and the inlet of the electric tee TV3, the first outlet of the electric tee TV3 is connected to the second inlet of the plate heat exchanger, the second outlet of the plate heat exchanger is connected to the second inlet of the heat transfer oil boiler, the second outlet of the electric tee TV3 is connected to the second inlet of the heat transfer oil boiler, and a thermometer T12 is arranged at the second inlet of the heat transfer oil boiler.

[0013] The absorption combined cooling and heating system driven by renewable energy proposed in the present invention introduces renewable energy drive and combines cooling and heating needs. One device realizes combined cooling and heating energy supply, thereby improving the utilization rate of renewable energy. Then, when the absorption combined cooling and heating system is in operation, refrigeration temperature control, absorber liquid level control, generated temperature control, heating temperature control and heat source power control can be used to control the absorption combined cooling and heating system driven by renewable energy, so as to realize efficient operation of the system by automatically adjusting the heating power setting according to changes in ambient temperature. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0015] in:

[0016] Figure 1 It is a schematic structural diagram of an absorption-type combined cooling and heating system driven by renewable energy in one embodiment;

[0017] Figure 2 A schematic diagram of the structure of refrigeration temperature control of an absorption-type combined cooling and heating system driven by renewable energy in one embodiment;

[0018] Figure 3 A schematic diagram of the structure of absorber liquid level control of an absorption-type combined cooling and heating system driven by renewable energy in one embodiment;

[0019] Figure 4 A schematic diagram of the structure of the temperature control of the absorption cooling and heating combined power generation system driven by renewable energy in one embodiment;

[0020] Figure 5 The schematic diagram is a structural diagram of heating temperature control and heat source power control of an absorption combined cooling and heating system driven by renewable energy in one embodiment. DETAILED DESCRIPTION

[0021] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by technicians in the technical field of the present application; the terms used in the specification of the application herein are only for the purpose of describing specific embodiments and are not intended to limit the present application; the terms "including" and "having" and any variations thereof in the specification and claims of the present application and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of the present application or the above-mentioned drawings are used to distinguish different objects, not to describe a specific order.

[0022] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] The absorption type combined cooling and heating system driven by renewable energy provided in the embodiment of the present invention is referred to Figure 1, P1 represents the generating pressure, P2 represents the intermediate evaporation pressure, P3 represents the intermediate absorption pressure, P4 represents the evaporation pressure, P5 represents the absorption pressure, T1 represents the generating temperature, T2 represents the intermediate absorption end temperature, T3 represents the absorption temperature, T4 represents the distillation outlet temperature, T5 represents the generating liquid return temperature, T6 represents the condensing temperature, T7 represents the intermediate evaporation temperature, T8 represents the evaporation temperature, T9 represents the evaporator outlet temperature, T10 represents the heat transfer oil inlet temperature, T11 represents the heat transfer oil outlet temperature, T12 represents the boiler inlet temperature, T13 represents the boiler outlet temperature, T14 represents the cooling return water temperature, T15 represents the cooling outlet water temperature, T16 represents the heating outlet water temperature, T17 represents the heating absorber outlet temperature, T18 represents the heating return water temperature, T19 indicates exhaust gas temperature, T20 indicates ambient temperature, T21 indicates collector inlet, T22 indicates collector outlet, T23 indicates plate exchanger inlet temperature, T24 indicates plate exchanger outlet temperature, F1 indicates solution circulation flow, F2 indicates heat transfer oil flow, F3 indicates cooling flow, F4 indicates heating flow, F5 indicates gas flow, F6 indicates collector flow, L1 indicates absorber liquid level, L2 indicates separator liquid level, LV1 indicates low-pressure working fluid throttle valve, LV2 indicates medium-pressure working fluid throttle valve, TV3 indicates plate exchanger switching valve, TV4 indicates radiator switching valve, TV5 indicates flue gas switching valve, LV6 indicates medium-pressure solution valve, LV7 indicates low-pressure solution valve, LV8 indicates heating regulating valve, LV9 indicates cooling regulating valve, and PUM1 indicates solution pump.

[0025] The absorption type combined cooling and heating system driven by renewable energy includes: solution circulation, ammonia working medium circulation, fuel gas-flue gas process, heating load circulation, cooling load circulation, solar heat collection heat transfer oil circulation, and heat transfer oil circulation;

[0026] The solution circulation includes: the first outlet of the generator is connected to one end of the stop valve H1, a thermometer T1 is arranged between the first outlet of the generator and the stop valve H1, the other end of the stop valve H1 is connected to one end of the throttle valve LV6, the other end of the throttle valve LV6 is connected to the first inlet of the medium-pressure absorber, a pressure gauge P3 is arranged between the other end of the throttle valve LV6 and the first inlet of the medium-pressure absorber, the first outlet of the medium-pressure absorber is connected to one end of the throttle valve LV7, a thermometer T2 is arranged between the first outlet of the medium-pressure absorber and one end of the throttle valve LV7, the other end of the throttle valve LV7 is connected to the first inlet of the absorber, and the first outlet of the absorber is connected to One end of the solution pump is connected, a pressure gauge P5 and a thermometer T3 are arranged between the first outlet of the absorber and one end of the solution pump, the other end of the solution pump is connected to one end of the flowmeter F1, the other end of the flowmeter F1 is connected to one end of the check valve C1, the other end of the check valve C1 is connected to the first inlet of the rectifier, the first outlet of the rectifier is connected to the second inlet of the medium-pressure absorber, a thermometer T4 is arranged between the first outlet of the rectifier and the second inlet of the medium-pressure absorber, the second outlet of the medium-pressure absorber is connected to the first inlet of the generator, and a thermometer T5 is arranged between the second outlet of the medium-pressure absorber and the first inlet of the generator;

[0027] In this embodiment, the solution circulation is used to heat the concentrated solution in the generator by countercurrent heat transfer oil, so that part of the ammonia gas evaporates and becomes a dilute solution. Under the action of pressure, the dilute solution flows from the generator through the stop valve H1, the throttle valve LV6, and the first inlet of the medium-pressure absorber into the medium-pressure absorber; in the medium-pressure absorber, the dilute solution exchanges heat with the concentrated solution refluxed to the generator, and after the heat exchange, the dilute solution flows into the absorber through the first outlet of the medium-pressure absorber, the throttle valve LV7, and the first inlet of the absorber in sequence; in the absorber, the dilute solution absorbs ammonia vapor, the solution concentration increases to form a concentrated solution, and heat is released; after heat exchange with the circulating water of the heating load, the concentrated solution is pressurized by the solution pump and flows into the rectifier, exchanges heat with the high-temperature ammonia vapor in the rectifier, and enters the medium-pressure absorber through the second inlet of the medium-pressure absorber; after the concentrated solution exchanges heat with the high-temperature dilute solution in the medium-pressure absorber, it flows from the second outlet of the medium-pressure absorber to the first inlet of the generator, and then flows into the generator. During the solution circulation, the liquid level of absorber L1 is maintained stable to ensure the balance between the solution entering the absorber and the solution leaving the absorber, thus achieving a stable solution circulation flow. By controlling the opening of the LV7 valve, the flow of the solution entering the absorber is adjusted, thereby controlling the size of the solution circulation flow; the size of the intermediate pressure P2 is controlled by adjusting the LV6 valve. The absorber liquid level PID control loop is introduced into the solution circulation loop.

[0028] The ammonia working medium cycle of the absorption-type combined cooling and heating system driven by renewable energy comprises that the second outlet of the generator is connected to the second inlet of the rectifier, the second outlet of the generator and the second inlet of the rectifier are provided with a pressure gauge P1, the second outlet of the rectifier is connected to the first inlet of the condenser, the first outlet of the condenser is connected to the first inlet of the subcooler, a thermometer T6 is provided between the first outlet of the condenser and the first inlet of the subcooler, the first outlet of the subcooler is connected to one end of the stop valve H2, the other end of the stop valve H2 is connected to one end of the throttle valve LV2, the other end of the throttle valve LV2 is connected to the first inlet of the medium-pressure evaporator, the first outlet of the medium-pressure evaporator is connected to the inlet of the separator, and the medium-pressure A thermometer T7 and a pressure gauge P2 are provided between the first outlet of the evaporator and the inlet of the separator, the first outlet of the separator is connected to one end of the stop valve H3, the other end of the stop valve H3 is connected to one end of the check valve C2, the other end of the check valve C2 is connected to the first inlet of the medium-pressure absorber, the separator is provided with a liquid level gauge L2, the second outlet of the separator is connected to one end of the throttle valve LV1, the other end of the throttle valve LV1 is connected to the first inlet of the evaporator, a thermometer T8 and a pressure gauge P4 are provided between the other end of the throttle valve LV1 and the first inlet of the evaporator, the first outlet of the evaporator is connected to the second inlet of the subcooler, and the second outlet of the subcooler is connected to the second inlet of the absorber;

[0029] In this embodiment, the high-temperature ammonia vapor in the generator is used in the ammonia working medium circulation to enter the second inlet of the rectifier through the second outlet of the generator, and is heat-exchanged with the low-temperature concentrated solution and purified in the rectifier;

[0030] The ammonia vapor after heat exchange and purification enters the condenser through the first inlet of the condenser and exchanges heat with the low-temperature circulating water for liquefaction; the liquefied ammonia working medium enters the subcooler through the first outlet of the condenser to form subcooled liquid ammonia;

[0031] The subcooled liquid ammonia passes through the stop valve H2, the throttle valve LV2, and the first inlet of the medium-pressure evaporator to enter the medium-pressure evaporator to absorb the waste heat of the flue gas; the liquid ammonia working medium heated by the flue gas enters the separator and partially evaporates in the separator;

[0032] The evaporated ammonia in the separator enters the medium-pressure absorber through the stop valve H3 and the check valve C2, and is absorbed by the medium-pressure dilute solution; the liquid ammonia in the separator is throttled and expanded by the throttle valve LV1 to form a low-pressure and low-temperature liquid ammonia working medium; the low-pressure and low-temperature liquid ammonia working medium enters the evaporator through the first inlet of the evaporator to evaporate at a low temperature, absorbs heat energy in the air, and becomes ammonia vapor with a higher temperature; the ammonia vapor with a higher temperature enters the subcooler through the second inlet of the subcooler, and enters the absorber from the second outlet of the subcooler;

[0033] In the absorber, ammonia vapor is absorbed by the dilute solution, the ammonia working fluid and the dilute solution are mixed to release heat, and a concentrated solution is obtained after heat exchange with the circulating water of the heating load. The concentrated solution after cooling is pressurized by the solution pump and returned to the generator through the distillation device and the medium-pressure absorber, completing the ammonia working fluid cycle.

[0034] It should be noted that the evaporation amount of ammonia can be adjusted by adjusting the opening of the LV1 valve. Under the premise that the solution flow rate remains unchanged, the evaporation temperature can be adjusted by adjusting the P3 pressure. In the working fluid circulation loop, the evaporation temperature PID control loop is introduced to adjust the evaporation temperature to match the working conditions of different low-temperature heat sources.

[0035] The gas-flue gas process of the absorption combined cooling and heating system driven by renewable energy includes gas and air inlets connected to the first inlet of the thermal oil boiler, flow meters F5 are arranged at the gas and air inlets, flow meters P5 are arranged on the pipeline between the gas and air inlets and the first inlet of the thermal oil boiler, the first outlet of the thermal oil boiler is respectively connected to one end of the cooling flue gas pipeline and one end of the heating flue gas pipeline through a three-way ball valve TV5, the other end of the heating flue gas pipeline is connected to the second inlet of the medium-pressure evaporator, the second outlet of the medium-pressure evaporator is connected to the flue gas outlet, and a thermometer T19 is arranged between the second outlet of the medium-pressure evaporator and the flue gas outlet;

[0036] In this embodiment, the gas-flue gas process is used for gas to flow into the burner, and high-temperature flue gas is generated after combustion; the high-temperature flue gas heats the thermal oil in the thermal oil boiler, and the flue gas with waste heat enters the intermediate evaporator at the second inlet of the intermediate evaporator through the heating flue gas pipeline, and the flue gas with waste heat exchanges with the low-temperature working medium and is discharged from the flue gas outlet.

[0037] The heating cycle of the absorption-type combined cooling and heating system driven by renewable energy includes: the second outlet of the condenser is connected to the third inlet of the absorber, a thermometer T17 is arranged between the second outlet of the condenser and the third inlet of the absorber, the absorber is provided with a liquid level gauge L1, the second outlet of the absorber is connected to one end of the throttle valve LV8, a thermometer T16 is arranged between the second outlet of the absorber and one end of the throttle valve LV8, the other end of the throttle valve LV8 is connected to one end of the flowmeter F4, the other end of the flowmeter F4 is connected to one end of the heating load, the other end of the heating load is connected to the second inlet of the condenser, and a thermometer T18 is arranged between the other end of the heating load and the second inlet of the condenser;

[0038] In this embodiment, the heating cycle is used for circulating water to enter the absorber from the second inlet of the absorber, exchange heat with concentrated ammonia water, and increase the temperature; the circulating water with increased temperature enters the condenser from the second inlet of the condenser through the throttle valve LV8, the flow meter F4, and the heating load, and condenses the ammonia vapor into liquid ammonia in the condenser to take away the heat. Specifically, the circulating water (temperature T16) enters the absorber, exchanges heat with concentrated ammonia water, and the temperature increases (T17); the circulating water enters the condenser, condenses the ammonia vapor into liquid ammonia, takes away the heat, and the water supply temperature is increased to T18. With the system water supply temperature T18 as the process quantity and T18_SV as the temperature target value, the heating temperature control is introduced: heating mode.

[0039] The refrigeration cycle of the absorption combined cooling and heating system driven by renewable energy includes: one end of the cooling load is connected to the second inlet of the evaporator, a thermometer T14 is arranged between the one end of the cooling load and the second inlet of the evaporator, the second outlet of the evaporator is connected to one end of the throttle valve LV9, a thermometer T15 is arranged between the second outlet of the evaporator and one end of the throttle valve LV9, the other end of the throttle valve LV9 is connected to one end of the flowmeter F3, and the other end of the flowmeter F3 is connected to the other end of the cooling load;

[0040] In this embodiment, the refrigeration cycle is used for the refrigerant solution to enter the evaporator from the second inlet of the evaporator, and after heat exchange with the low-temperature working medium, enter the cooling load through the throttle valve LV9 and the flow meter F3. Specifically, the refrigerant solution (temperature T14) enters the evaporator, exchanges heat with the low-temperature working medium, and the temperature of the refrigerant solution decreases (temperature T15) to supply the cooling end load. With the system cooling temperature T15 as the process quantity and T15_SV as the temperature target value, the heating temperature control is introduced: cooling mode.

[0041] The solar heat collection heat transfer oil circulation of the absorption type combined cooling and heating system driven by renewable energy includes a first outlet of a plate heat exchanger connected to an inlet of a heat collection circulation pump, a thermometer T24 is arranged between the first outlet of the plate heat exchanger and the inlet of the heat collection circulation pump, the outlet of the heat collection circulation pump is connected to one end of a flow meter F6, the other end of the flow meter F6 is connected to the inlet of a solar collector, a thermometer T21 is arranged between the other end of the flow meter F6 and the inlet of the solar collector, the outlet of the solar collector is connected to the inlet of an electric tee TV4, a thermometer T22 is arranged between the outlet of the solar collector and the inlet of the electric tee TV4, the first outlet of the electric tee TV4 is connected to the first inlet of the plate heat exchanger, the second outlet of the electric tee TV4 is connected to the inlet of a radiator, the outlet of the radiator is connected to the first inlet of the plate heat exchanger, and a thermometer T23 is arranged at the first inlet of the plate heat exchanger;

[0042] In this embodiment, the solar heat collection heat transfer oil circulation is used for the heat transfer oil to enter the heat collection circulation pump from the first outlet of the plate heat exchanger, and after being pressurized by the heat collection circulation pump, enter the solar heat collector, the solar heat collector heats the heat transfer oil, and the heated heat transfer oil enters the plate heat exchanger through the first inlet of the plate heat exchanger to exchange heat with the heat transfer oil circulating in the heat transfer oil circulation. Specifically, the heat transfer oil enters the heat collection circulation pump from the outlet of the plate heat exchanger (temperature T24), is pressurized by the circulation pump, and enters the solar heat collector, the solar heat collector heats the heat transfer oil (temperature T23), and then enters the plate heat exchanger to exchange heat with the circulating heat transfer oil, providing a high-temperature driving heat source for the system. The solar heat collection heat transfer oil circulation is provided with a bypass valve and a radiator for overheating protection of the heat collection system.

[0043] The heat transfer oil circulation of the absorption combined cooling and heating system driven by renewable energy includes the second outlet of the heat transfer oil boiler being connected to the inlet of the generation circulation pump, a thermometer T13 is arranged between the second outlet of the heat transfer oil boiler and the inlet of the generation circulation pump, the outlet of the generation circulation pump is connected to one end of a flow meter F2, the other end of the flow meter F2 is connected to the second inlet of the generator, a thermometer T10 is arranged between the other end of the flow meter F2 and the second inlet of the generator, the third outlet of the generator is connected to the inlet of an electric tee TV3, a thermometer T11 is arranged between the third outlet of the generator and the inlet of the electric tee TV3, the first outlet of the electric tee TV3 is connected to the second inlet of the plate heat exchanger, the second outlet of the plate heat exchanger is connected to the second inlet of the heat transfer oil boiler, the second outlet of the electric tee TV3 is connected to the second inlet of the heat transfer oil boiler, and a thermometer T12 is arranged at the second inlet of the heat transfer oil boiler.

[0044] In this embodiment, the heat transfer oil circulation is used for high-temperature heat transfer oil to enter the generator from the second outlet of the heat transfer oil boiler through the circulation pump under pressure. The high-temperature heat transfer oil in the generator tube heats the shell side solution to evaporate ammonia vapor. The heat transfer oil after the heat exchange is completed flows out of the generator and enters the heat transfer oil plate heat exchanger through the electric tee TV3. The plate heat exchanger exchanges heat with the high-temperature heat transfer oil in the solar energy collector cycle. The temperature of the heat transfer oil in the heat transfer oil circulation increases, and then it flows into the heat transfer oil boiler, and is supplemented with heat by the heat transfer oil boiler to produce high-temperature heat transfer oil with stable temperature.

[0045] Specifically, the high-temperature heat transfer oil is pressurized from the boiler outlet through the circulating pump and enters the generator (inlet temperature T10). In the generator tube, the high-temperature heat transfer oil heats the shell side solution and evaporates ammonia vapor. After the heat exchange is completed, the heat transfer oil flows out of the generator (outlet temperature T11), enters the heat transfer oil plate heat exchanger through the switching valve TV3, and exchanges heat with the high-temperature heat transfer oil in the solar heat collection cycle in the plate heat exchanger, causing the circulating heat transfer oil temperature to rise (T12). Then, it flows into the heat transfer oil boiler and is supplemented with heat by the heat transfer oil boiler to produce high-temperature heat transfer oil with stable temperature. The burner of the heat transfer oil boiler is used as an actuator and introduced into the heat source power control loop.

[0046] As an example, the start-stop control method of the absorption combined cooling and heating system driven by renewable energy of the present invention is as follows: startup parameter setting: after issuing the startup command, set the startup start burner opening, LV1 opening, LV2 opening, LV5 opening, LV6 opening, and absorber liquid level target opening L1_SV_start; startup heat transfer oil circulation control: detect whether the circulating water flow F1 is normal. If the circulating water flow is normal, start the heat collection circulation pump, and fully open the radiator circulation valve TV4 to 100%, that is, the heat transfer oil does not pass through the radiator; start the generation circulation pump, open the plate heat exchanger switching valve TV3 , that is, circulating heat transfer oil passes through the plate heat exchanger, and light and heat intervene; after a delay of 20 minutes; start combustion, the burner fixed power control Q_HJ_SV value is fixed, that is, the heat source power control loop is in manual mode; L1 liquid level is greater than the preset value L1_SV_start, start the circulation pump M1, and turn on the liquid level automatic control mode; if T11>T23, close the plate heat exchanger switching valve TV3, that is, cut off the light and heat; judge: whether P1-P3 is greater than 0.8MPa, T2 temperature matches P3 pressure saturation temperature T_P3, pressure and temperature conditions are met, and the system startup is completed. The shutdown control process of the absorption type combined cooling and heating system driven by renewable energy of the present invention is: after issuing a shutdown command, turn off the burner, close the plate switching valve TV3, turn off the heat collection circulation pump, and turn off the generation circulation pump; P1<1.0MPa, T1<100℃, directly turn off the solution pump, otherwise after the gas is turned off, delay 30 minutes, turn off the solution pump M1; turn off V1 and V2.

[0047] As an example, the renewable energy-driven absorption combined cooling and heating system of the present invention introduces multiple control loops, including Figure 2 Refrigeration temperature control as shown Figure 3 The absorber level control shown in Figure 4 The temperature control occurs as shown, Figure 5 The heating temperature control and heat source power control are shown.

[0048] Refrigeration temperature control: T8 is used as the process quantity, LV1 is used as the regulating actuator, and the average temperature of the T14 stage minus the offset is used as the set value T8_SV to achieve automatic adjustment of the evaporation temperature. Absorber liquid level control: L1 is used as the process quantity, the solution pump PUM1 is used as the regulating actuator, and the reference set value minus the average liquid level value of the separator stage is used as the set value L1_SV to achieve balanced control of the absorber, generator, and separator liquid levels.

[0049] Generation temperature control: pre-set the matching relationship between evaporation temperature and generation temperature, determine the generation temperature setting value T1_SV according to the evaporation temperature, and adjust the opening of LV7 according to the deviation between the actual generation temperature T1 and the setting value T1_SV. If T1 is too high, increase the opening of LV7, increase the solution flow, and reduce the generation temperature; if T1 is too low, reduce the opening of LV7, reduce the solution flow, and increase the generation temperature.

[0050] Heating temperature control: Heating mode. The water supply temperature T18_SV_PRE and the supply and return water temperature difference Δ_T16T18_PRE are preset. The system sets the LV8 opening according to the rated output power, and then sets the water supply flow. With the water supply temperature T18 as the process quantity, T18_SV as the target quantity, and the input power control set value Q_HJ_SV as the regulation output, the PID regulation loop is introduced to automatically control the water supply temperature. When the heat source power is adjusted to the maximum, the water supply temperature T18 is still lower than the target temperature T18_SV, and the LV8 opening is reduced, thereby reducing the water supply flow; when the heat source power is adjusted to the minimum, the water supply temperature T18 is still higher than the target temperature T18_SV, and the LV8 opening is increased, thereby increasing the water supply flow.

[0051] Heating temperature control: In cooling mode, the cooling temperature T15_SV_PRE and the temperature difference between the cooling inlet and outlet medium Δ_T14T15_PRE are preset. The system sets the LV9 opening according to the rated output power, and then sets the cooling medium flow rate. With the cooling temperature T15 as the process quantity, T15_SV as the target quantity, and the input power control set value Q_HJ_SV as the adjustment output, the PID adjustment loop is introduced to automatically control the cooling temperature. When the heat source power is adjusted to the maximum, the cooling temperature T15 is still higher than the target temperature T15_SV, and the LV8 opening is reduced, thereby reducing the cooling medium flow rate; when the heat source power is adjusted to the minimum, the cooling temperature T15 is still lower than the target temperature T15_SV, and the LV8 opening is increased, thereby increasing the cooling medium flow rate.

[0052] Heat source power control: Taking the calculated input power Q_HJ as the process variable, Q_HJ_SV as the set value, and the burner output M4 as the regulator, a PID regulation loop is introduced. Among them, Q_HJ is the sum of the solar thermal input power Q_J and the gas power Q_H. When Q_J > Q_HJ_SV, the burner is turned off; after the burner is turned off, the regulation output of the PID loop is switched to the opening of the heat dissipation switching valve TV4, and the heat source power is controlled by adjusting the opening of TV4; when the opening of the heat dissipation switching valve is 100% and Q_HJ_SV - Q_H < Q_HJ_SV * 10%, the burner is turned on, and the regulation output of the PID loop is switched to the burner output M4; when T11 > T23, the plate heat exchanger switching valve TV3 is closed to cut off the solar thermal energy, and when T11 < T23, the plate heat exchanger switching valve TV3 is opened to connect the solar thermal energy.

[0053] After the system starts, through the coordinated control of multiple loops such as refrigeration temperature control, absorber liquid level control, generator temperature control, heating temperature control, and heat source power control, the system realizes variable-condition and variable-power adaptive operation.

[0054] The control process of the multi-loop linkage control is as follows:

[0055] After the system startup is completed, the heat source drive control is set to the automatic mode, and the output temperature target set value T15_SV (T18_SV) is set; the refrigeration control loop is set to the automatic mode, and the evaporation temperature set value automatically follows the average value of T14 minus 7°C; the L1_SV of the absorber liquid level control loop decreases inversely with the increase of the separator liquid level L2, and the minimum value is not less than L1_min.

[0056] After running for 60 minutes, the average heat source power Q_HJ_AVG1, the temperature difference between the supply and return water Δ_T14T15 (Δ_T18T16) are calculated, and the heating temperature control loop is set to manual; the set value Q_HJ_SV of the heat source power control loop is set to Q_HJ_AVG1; the average opening V1_AVG of V1 is calculated, the upper limit V1_max of the V1 opening is set to V1_AVG + 20, and the lower limit V1_min of the V1 opening is set to V1_AVG - 20; the average value L2_AVG of the L2 liquid level is calculated.

[0057] Calculate the average value of T15 (T18) every 60 minutes, and calculate the difference from T15_SV (T18_SV) to obtain Δ_T15 = T15_SV - T15_AVG (Δ_T18 = T18_SV - T18_AVG). The set value of the heat source power control loop is Q_HJ_SV = Q_HJ_SV * (1 + Δ_T15 / Δ_T14T15) (Q_HJ_SV = Q_HJ_SV * (1 + Δ_T18 / Δ_T16T18)); calculate the average value of the V1 opening V1_AVG, set the upper limit of the V1 opening V1_max to V1_AVG + 20, and set the lower limit of the V1 opening V1_min to V1_AVG - 20; calculate the average value of the L2 liquid level L2_AVG, calculate the difference Δ_L2 from the previous L2 average value, and increase L1_SV in the reverse direction by Δ_L2.

[0058] After the system startup is completed, every 60 minutes, calculate the average values of Q_H and Q_J, Q_H_AVG and Q_J_AVG respectively, and make a judgment on the burner stop and supplementary combustion. If Q_J_AVG > Q_HJ_SV, close the burner. After the burner is closed, the adjustment output of the PID loop is switched to the opening of the heat dissipation switching valve TV4, and the heat source power is controlled by adjusting the opening of the heat dissipation switching valve TV4; when the opening of the heat dissipation switching valve TV4 is 100% and Q_HJ_SV - Q_H < Q_HJ_SV * 10%, the burner is turned on, and the adjustment output of the PID loop is switched to the burner output M4; calculate the average values of T11 and T23, T11_AVG and T23_AVG. If T11_AVG - T23_AVG > 2, close the plate heat exchanger switching valve TV3 to cut off the solar heat. If T23_AVG - T11_AVG > 2, open the plate heat exchanger switching valve TV3 to connect the solar heat.

[0059] The renewable energy-driven absorption-type combined cooling and heating supply system proposed in this embodiment introduces renewable energy drive and combines cooling and heating demands. One device realizes combined energy supply for cooling and heating. The superposition of multiple driving energies in the system, and to meet cooling and heating according to demands, increases the system control difficulty. The changes in driving load, user-side load, and environment will cause system performance changes, and the system stability and efficiency are affected. To enhance system stability, adapt to variable power operation at different ambient temperatures, and achieve the optimal system efficiency, multi-loop coordinated control of refrigeration temperature control, absorber liquid level control, generation temperature control, heating temperature control, and heat source power control is introduced to achieve variable-condition and variable-power adaptive operation, and to realize the automatic adjustment and efficient operation of the system with the change of ambient temperature and heating power setting. Combine the ambient temperature, dew point temperature, and evaporation temperature to judge the frosting condition of the evaporator, and inject medium-pressure solution into the evaporator through the defrosting valve to increase the evaporator temperature and achieve automatic defrosting control. In a low-temperature environment, achieve automatic heating temperature control and automatic defrosting control, and have the best evaporation temperature and the optimal system efficiency during variable-condition operation.

[0060] The three-loop linkage control of refrigeration temperature control, absorber liquid level control, and heat source power control is introduced to realize system adaptive control, automatically adjust and operate efficiently with changes in ambient temperature and heating and cooling power demand; realize efficient start and stop control, and realize cooling and heating switching control of the combined heat and cold supply system. The absorber liquid level control loop stabilizes the absorber liquid level and flow, adjusts the amount of generated solution, and ensures the generation effect; the refrigeration temperature control loop adjusts the evaporation temperature to ensure evaporation efficiency according to the ambient temperature; the heat source drive control adjusts the burner power to achieve stable coupling of light heat and gas heat.

[0061] The embodiments described above are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be included in the protection scope of the present invention.

Claims

1. An absorption combined cooling and heating system driven by renewable energy, characterized in that: The absorption type combined cooling and heating system driven by renewable energy includes: solution circulation, ammonia working medium circulation, fuel gas-flue gas process, heating load circulation, cooling load circulation, solar heat collection heat transfer oil circulation, and heat transfer oil circulation; The solution circulation includes: the first outlet of the generator is connected to one end of the stop valve H1, a thermometer T1 is arranged between the first outlet of the generator and the stop valve H1, the other end of the stop valve H1 is connected to one end of the throttle valve LV6, the other end of the throttle valve LV6 is connected to the first inlet of the medium-pressure absorber, a pressure gauge P3 is arranged between the other end of the throttle valve LV6 and the first inlet of the medium-pressure absorber, the first outlet of the medium-pressure absorber is connected to one end of the throttle valve LV7, a thermometer T2 is arranged between the first outlet of the medium-pressure absorber and one end of the throttle valve LV7, the other end of the throttle valve LV7 is connected to the first inlet of the absorber, and the first outlet of the absorber is connected to One end of the solution pump is connected, a pressure gauge P5 and a thermometer T3 are arranged between the first outlet of the absorber and one end of the solution pump, the other end of the solution pump is connected to one end of the flowmeter F1, the other end of the flowmeter F1 is connected to one end of the check valve C1, the other end of the check valve C1 is connected to the first inlet of the rectifier, the first outlet of the rectifier is connected to the second inlet of the medium-pressure absorber, a thermometer T4 is arranged between the first outlet of the rectifier and the second inlet of the medium-pressure absorber, the second outlet of the medium-pressure absorber is connected to the first inlet of the generator, and a thermometer T5 is arranged between the second outlet of the medium-pressure absorber and the first inlet of the generator; The ammonia working medium cycle includes: the second outlet of the generator is connected to the second inlet of the rectifier, the second outlet of the generator and the second inlet of the rectifier are provided with a pressure gauge P1, the second outlet of the rectifier is connected to the first inlet of the condenser, the first outlet of the condenser is connected to the first inlet of the subcooler, a thermometer T6 is provided between the first outlet of the condenser and the first inlet of the subcooler, the first outlet of the subcooler is connected to one end of the stop valve H2, the other end of the stop valve H2 is connected to one end of the throttle valve LV2, the other end of the throttle valve LV2 is connected to the first inlet of the medium-pressure evaporator, the first outlet of the medium-pressure evaporator is connected to the inlet of the separator, the first outlet of the medium-pressure evaporator is connected to A thermometer T7 and a pressure gauge P2 are provided between the inlets of the separator, the first outlet of the separator is connected to one end of the stop valve H3, the other end of the stop valve H3 is connected to one end of the check valve C2, the other end of the check valve C2 is connected to the first inlet of the medium-pressure absorber, the separator is provided with a liquid level gauge L2, the second outlet of the separator is connected to one end of the throttle valve LV1, the other end of the throttle valve LV1 is connected to the first inlet of the evaporator, a thermometer T8 and a pressure gauge P4 are provided between the other end of the throttle valve LV1 and the first inlet of the evaporator, the first outlet of the evaporator is connected to the second inlet of the subcooler, and the second outlet of the subcooler is connected to the second inlet of the absorber; The gas-flue gas process includes a gas and air inlet connected to the first inlet of the thermal oil boiler, a flow meter F5 is provided at the gas and air inlet, a flow meter P5 is provided on the pipeline between the gas and air inlet and the first inlet of the thermal oil boiler, a first outlet of the thermal oil boiler is respectively connected to one end of the cooling flue gas pipeline and one end of the heating flue gas pipeline through a three-way ball valve TV5, the other end of the heating flue gas pipeline is connected to the second inlet of the medium-pressure evaporator, the second outlet of the medium-pressure evaporator is connected to the flue gas outlet, and a thermometer T19 is provided between the second outlet of the medium-pressure evaporator and the flue gas outlet; The heating cycle includes a second outlet of the condenser connected to a third inlet of the absorber, a thermometer T17 is provided between the second outlet of the condenser and the third inlet of the absorber, the absorber is provided with a liquid level gauge L1, the second outlet of the absorber is connected to one end of a throttle valve LV8, a thermometer T16 is provided between the second outlet of the absorber and one end of the throttle valve LV8, the other end of the throttle valve LV8 is connected to one end of a flowmeter F4, the other end of the flowmeter F4 is connected to one end of a heating load, the other end of the heating load is connected to the second inlet of the condenser, and a thermometer T18 is provided between the other end of the heating load and the second inlet of the condenser; The refrigeration cycle includes one end of the cooling load connected to the second inlet of the evaporator, a thermometer T14 is provided between the one end of the cooling load and the second inlet of the evaporator, the second outlet of the evaporator is connected to one end of the throttle valve LV9, a thermometer T15 is provided between the second outlet of the evaporator and one end of the throttle valve LV9, the other end of the throttle valve LV9 is connected to one end of a flow meter F3, and the other end of the flow meter F3 is connected to the other end of the cooling load; The solar heat collection heat transfer oil circulation includes a first outlet of a plate heat exchanger connected to an inlet of a heat collection circulation pump, a thermometer T24 is provided between the first outlet of the plate heat exchanger and the inlet of the heat collection circulation pump, the outlet of the heat collection circulation pump is connected to one end of a flow meter F6, the other end of the flow meter F6 is connected to the inlet of a solar heat collector, a thermometer T21 is provided between the other end of the flow meter F6 and the inlet of the solar heat collector, the outlet of the solar heat collector is connected to the inlet of an electric tee TV4, a thermometer T22 is provided between the outlet of the solar heat collector and the inlet of the electric tee TV4, the first outlet of the electric tee TV4 is connected to the first inlet of the plate heat exchanger, the second outlet of the electric tee TV4 is connected to the inlet of a radiator, the outlet of the radiator is connected to the first inlet of the plate heat exchanger, and a thermometer T23 is provided at the first inlet of the plate heat exchanger; The heat transfer oil circulation comprises that the second outlet of the heat transfer oil boiler is connected to the inlet of the circulation pump, a thermometer T13 is arranged between the second outlet of the heat transfer oil boiler and the inlet of the circulation pump, the outlet of the circulation pump is connected to one end of a flow meter F2, the other end of the flow meter F2 is connected to the second inlet of the generator, a thermometer T10 is arranged between the other end of the flow meter F2 and the second inlet of the generator, the third outlet of the generator is connected to the inlet of an electric tee TV3, a thermometer T11 is arranged between the third outlet of the generator and the inlet of the electric tee TV3, the first outlet of the electric tee TV3 is connected to the second inlet of the plate heat exchanger, the second outlet of the plate heat exchanger is connected to the second inlet of the heat transfer oil boiler, the second outlet of the electric tee TV3 is connected to the second inlet of the heat transfer oil boiler, and a thermometer T12 is arranged at the second inlet of the heat transfer oil boiler.

2. The absorption combined cooling and heating system driven by renewable energy according to claim 1, characterized in that: Solution circulation is used to heat the concentrated solution in the generator by countercurrent heat transfer of heat-conducting oil, so that part of the ammonia evaporates and becomes a dilute solution. Under the action of pressure, the dilute solution flows from the generator through the stop valve H1, the throttle valve LV6, and the first inlet of the medium-pressure absorber into the medium-pressure absorber; In the medium-pressure absorber, the dilute solution exchanges heat with the concentrated solution refluxed to the generator, and after the heat exchange, the dilute solution flows into the absorber through the first outlet of the medium-pressure absorber, the throttle valve LV7, and the first inlet of the absorber in sequence; in the absorber, the dilute solution absorbs ammonia vapor, the solution concentration increases to form a concentrated solution, and releases heat; after heat exchange with the heating load circulating water, the concentrated solution is pressurized by the solution pump and flows into the rectifier, exchanges heat with the high-temperature ammonia vapor in the rectifier, and enters the medium-pressure absorber through the second inlet of the medium-pressure absorber; after the concentrated solution exchanges heat with the high-temperature dilute solution in the medium-pressure absorber, it flows from the second outlet of the medium-pressure absorber to the first inlet of the generator, and then flows into the generator.

3. The absorption combined cooling and heating system driven by renewable energy according to claim 2, characterized in that: The high-temperature ammonia vapor in the ammonia working medium cycle is used to enter the second inlet of the rectifier through the second outlet of the generator, and is heat-exchanged with the low-temperature concentrated solution and purified in the rectifier; The ammonia vapor after heat exchange and purification enters the condenser through the first inlet of the condenser and exchanges heat with the low-temperature circulating water for liquefaction; the liquefied ammonia working medium enters the subcooler through the first outlet of the condenser to form subcooled liquid ammonia; The subcooled liquid ammonia passes through the stop valve H2, the throttle valve LV2, and the first inlet of the medium-pressure evaporator to enter the medium-pressure evaporator to absorb the waste heat of the flue gas; the liquid ammonia working medium heated by the flue gas enters the separator and partially evaporates in the separator; The evaporated ammonia in the separator enters the medium-pressure absorber through the stop valve H3 and the check valve C2, and is absorbed by the medium-pressure dilute solution; the liquid ammonia in the separator is throttled and expanded by the throttle valve LV1 to form a low-pressure and low-temperature liquid ammonia working medium; the low-pressure and low-temperature liquid ammonia working medium enters the evaporator through the first inlet of the evaporator to evaporate at a low temperature, absorbs heat energy in the air, and becomes ammonia vapor with a higher temperature; the ammonia vapor with a higher temperature enters the subcooler through the second inlet of the subcooler, and enters the absorber from the second outlet of the subcooler; In the absorber, ammonia vapor is absorbed by the dilute solution, the ammonia working fluid and the dilute solution are mixed to release heat, and a concentrated solution is obtained after heat exchange with the circulating water of the heating load. The concentrated solution after cooling is pressurized by the solution pump and returned to the generator through the distillation device and the medium-pressure absorber, completing the ammonia working fluid cycle.

4. The absorption combined cooling and heating system driven by renewable energy according to claim 3, characterized in that: The gas-flue gas process is used for gas to flow into the burner and generate high-temperature flue gas after combustion; the high-temperature flue gas heats the heat transfer oil in the heat transfer oil boiler, and the flue gas with waste heat enters the intermediate evaporator at the second inlet of the intermediate evaporator through the heating flue gas pipeline. The flue gas with waste heat exchanges with the low-temperature working medium and is discharged from the flue gas outlet.

5. The absorption combined cooling and heating system driven by renewable energy according to claim 4, characterized in that: Heating cycle: The circulating water enters the absorber from the second inlet of the absorber, exchanges heat with the concentrated ammonia water, and its temperature rises; the circulating water with increased temperature passes through the throttle valve LV8, flow meter F4, and heating load and enters the condenser from the second inlet of the condenser, where the ammonia vapor is condensed into liquid ammonia and the heat is taken away.

6. The absorption combined cooling and heating system driven by renewable energy according to claim 5, characterized in that: Refrigeration cycle: The refrigerant solution enters the evaporator from the second inlet of the evaporator, exchanges heat with the low-temperature working medium, and then enters the cooling load through the throttle valve LV9 and the flow meter F3.

7. The absorption combined cooling and heating system driven by renewable energy according to claim 6, characterized in that: The solar thermal oil circulation is used for the heat transfer oil to enter the heat transfer circulation pump from the first outlet of the plate heat exchanger, and after being pressurized by the heat transfer circulation pump, it enters the solar thermal collector. The solar thermal collector heats the heat transfer oil, and the heated heat transfer oil enters the plate heat exchanger through the first inlet of the plate heat exchanger to exchange heat with the heat transfer oil in the heat transfer oil circulation.

8. The absorption combined cooling and heating system driven by renewable energy according to claim 7, characterized in that: The heat transfer oil circulation is used for high-temperature heat transfer oil to enter the generator from the second outlet of the heat transfer oil boiler through the circulation pump under pressure. In the generator tube, the high-temperature heat transfer oil heats the shell side solution to evaporate ammonia vapor. After the heat exchange is completed, the heat transfer oil flows out of the generator and enters the heat transfer oil plate heat exchanger through the electric tee TV3. The plate heat exchanger exchanges heat with the high-temperature heat transfer oil in the solar energy collector cycle. The temperature of the heat transfer oil in the heat transfer oil circulation rises and then flows into the heat transfer oil boiler. After being heated by the heat transfer oil boiler, high-temperature heat transfer oil with stable temperature is generated.

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