Air source absorption heat pump system

Abstract

An air source absorption heat pump system comprises a refrigerant circulation pipeline and an absorbent circulation pipeline, a generator, a condenser, an evaporator and an absorber are sequentially installed and connected on the refrigerant circulation pipeline, and a first throttling device is arranged between the condenser and the evaporator; the absorbent circulating pipeline is arranged between the generator and the absorber; a solution pipeline is arranged between the absorber and the generator, and a solution pump is arranged on the solution pipeline. By the adoption of the technical scheme, driving energy of the gas heat pump is natural gas environment-friendly energy, low-level heat energy (such as heat contained in air) is converted into available high-level heat energy, the energy utilization rate is increased, and the influence of system work on air quality is reduced.

Description

[Technical field]

[0001] The utility model relates to the technical field of energy utilization, in particular to an air source absorption heat pump system. [Background technology]

[0002] Heating is a measure to keep warm. At present, the main measure taken by my country is centralized heating. Centralized heating refers to the way in which steam and hot water generated by centralized heat sources are supplied to a city (town) or part of a region through a pipeline network for the heat required for production, heating and life. Centralized heating is one of the basic facilities of modern cities and an important facility of urban public utilities. Centralized heating can provide cities with a stable, reliable and high-quality heat source and improve people's lives.

[0003] At present, most centralized heating uses gas boilers to provide heat sources. Gas boilers mainly generate heat energy by burning gas, but their efficiency is relatively low, and their energy consumption is large, which will cause certain air pollution. [Contents of the utility model]

[0004] In view of the shortcomings of the prior art, the purpose of this application is to provide an air source absorption heat pump system, which uses natural gas as the driving energy of the gas heat pump, and converts low-level thermal energy (such as the heat contained in the air) into usable high-level thermal energy, thereby improving energy utilization and reducing the impact of system operation on air quality.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] An air source absorption heat pump system, comprising:

[0007] It comprises a refrigerant circulation pipeline and an absorbent circulation pipeline, wherein a generator, a condenser, an evaporator and an absorber are sequentially installed and connected on the refrigerant circulation pipeline, and a first throttling device is arranged between the condenser and the evaporator; the absorbent circulation pipeline is arranged between the generator and the absorber; a solution pipeline is arranged between the absorber and the generator, and a solution pump is arranged on the solution pipeline.

[0008] The utility model is further configured as follows: a burner is installed in the generator, and the burner is communicated with a gas pipeline.

[0009] The utility model is further configured to include: a solar photovoltaic device, wherein the solar photovoltaic device is connected to a storage battery, and the storage battery is connected to the generator.

[0010] The utility model is further configured as follows: a rectification device is arranged between the generator and the condenser.

[0011] The utility model is further configured as follows: a liquid storage device and a first supercooling device are sequentially arranged between the condenser and the throttling device.

[0012] The utility model is further configured as follows: a gas-liquid separation device is provided between the first supercooling device and the absorber.

[0013] The utility model is further configured as follows: the absorbent circulation pipeline is provided with a second throttling device.

[0014] The utility model is further configured as follows: the absorbent circulation pipeline is provided with a second supercooling device, and the second supercooling device is connected to the solution pump.

[0015] The utility model is further configured as follows: the first throttling device and the second throttling device both adopt electronic expansion valves.

[0016] The utility model is further configured to include a defrost valve for defrosting the evaporator, wherein the defrost valve is arranged between the generator and the evaporator; or the defrost valve is arranged between the absorber and the evaporator.

[0017] Compared with the prior art, the utility model has the following advantages:

[0018] The utility model adopts gas heat pump heating technology for heating, and can combine gas and air source heat pump. The system has two parts of energy input, one part comes from the combustion of natural gas, and the other part comes from air energy. Heat is extracted from the air, that is, low-level thermal energy that cannot be directly used (such as the heat contained in the air) can be converted into usable high-level thermal energy, which reduces the cost of liquid ammonia gasification and improves energy utilization. At the same time, the driving energy of the gas heat pump is natural gas, an environmentally friendly energy, which is directly burned and utilized, and is efficiently utilized, thereby reducing waste of resources and reducing the impact on air quality.

Brief Description of the Drawings

[0019] Figure 1 Schematic diagram of the structure of the air source absorption heat pump system of this embodiment.

[0020] Figure numerals: 11. generator; 12. condenser; 13. evaporator; 14. absorber; 2. solution pump; 31. first throttling device; 32. second throttling device; 4. distillation device; 51. first subcooling device; 52. second subcooling device; 6. liquid storage device; 7. gas-liquid separation device; 8. defrost valve. [Specific implementation method]

[0021] The embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although certain embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be construed as being limited to the embodiments described herein. Instead, these embodiments are provided to provide a more thorough and complete understanding of the present invention. It should be understood that the drawings and embodiments of the present invention are only for exemplary purposes and are not intended to limit the scope of protection of the present invention.

[0022] It should be understood that the various steps described in the method implementation of the present utility model can be performed in different orders and / or performed in parallel. In addition, the method implementation may include additional steps and / or omit the steps shown. The scope of the present utility model is not limited in this respect.

[0023] The term "including" and its variations used herein are open inclusions, i.e., "including but not limited to". The term "connected" may be directly connected or indirectly connected through intermediate components (elements). The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one other embodiment"; the term "some embodiments" means "at least some embodiments". The relevant definitions of other terms will be given in the following description.

[0024] It should be noted that the concepts such as "first" and "second" mentioned in the present invention are only used to distinguish between devices, modules or units, and are not used to limit these devices, modules or units to be different devices, modules or units, nor are they used to limit the order or interdependence of the functions performed by these devices, modules or units.

[0025] Air source absorption heat pump is an efficient and environmentally friendly energy utilization equipment. It adopts the reverse Carnot principle to absorb low-grade thermal energy in the air and convert it into high-grade thermal energy that can be used by people, thereby saving some high-grade energy (such as coal, gas, oil, electricity, etc.).

[0026] like Figure 1 As shown, the utility model discloses an air source absorption heat pump system, comprising:

[0027] It includes a refrigerant circulation pipeline and an absorbent circulation pipeline. The refrigerant circulation pipeline is sequentially installed with a generator 11, a condenser 12, an evaporator 13 and an absorber 14, and a first throttling device 31 is arranged between the condenser 12 and the evaporator 13; the absorbent circulation pipeline is arranged between the generator 11 and the absorber 14; a solution pipeline is arranged between the absorber 14 and the generator 11, and a solution pump 2 is arranged on the solution pipeline.

[0028] Optionally, on the refrigerant circulation pipeline, the system sequentially installs four core components, namely, a generator 11, a condenser 12, an evaporator 13 and an absorber 14. During the circulation process, the refrigerant is first heated and evaporated in the generator 11 to form a high-pressure and high-temperature gaseous refrigerant; then, the gaseous refrigerant enters the condenser 12, and is converted into a liquid refrigerant after being cooled, and releases a large amount of heat energy; the liquid refrigerant then enters the evaporator 13, absorbs low-grade heat energy in the outside air, and evaporates into a gaseous refrigerant, thereby realizing energy conversion and transfer; finally, the gaseous refrigerant enters the absorber 14, is absorbed by the absorbent, and completes the entire circulation process.

[0029] Specifically, a first throttling device 31 is arranged between the condenser 12 and the evaporator 13. The first throttling device 31 can effectively control the flow rate and pressure of the refrigerant to ensure efficient and stable operation of the system. At the same time, the first throttling device 31 can also cool and reduce the pressure of the refrigerant to further improve the energy efficiency ratio of the system.

[0030] Optionally, in the absorbent circulation pipeline, the absorbent circulation pipeline is arranged between the generator 11 and the absorber 14, so as to realize the recycling of the absorbent. The absorbent absorbs the refrigerant vapor in the generator 11 to form a concentrated solution; then, the concentrated solution is transported to the absorber 14 through the action of the solution pump 2, releases the refrigerant vapor, and reabsorbs the new refrigerant vapor to form a dilute solution; the dilute solution returns to the generator 11 to complete the whole cycle. In addition, the system is provided with a solution pump 2, the function of which is to provide power for the absorbent, to drive it to circulate in the absorbent circulation pipeline, and by adjusting the speed and flow of the solution pump 2, the refrigerant evaporation pressure and temperature can be precisely controlled, further improving the energy efficiency ratio and stability of the heat pump system.

[0031] Optionally, a burner is installed in the generator 11, and the burner is connected to the gas pipeline.

[0032] Specifically, a burner is installed in the generator 11, and the burner is connected to the gas pipeline. When the system needs additional heat energy, the gas can be burned by the burner to heat the solution in the generator 11, thereby driving the refrigerant circulation and realizing the conversion and transfer of heat energy.

[0033] Optionally, a solar photovoltaic device is also included, wherein the solar photovoltaic device is connected to a battery, and the battery is connected to the generator 11.

[0034] Specifically, in order to further improve the energy utilization efficiency of the system, the system introduces a solar photovoltaic device, which converts solar energy into electrical energy through the photoelectric effect and is connected to a battery for storage, and the battery is connected to the generator 11; when there is sufficient solar energy, the battery can provide power for the generator 11 and reduce the use of the burner, thereby greatly reducing the energy consumption and operating costs of the system. By integrating the gas burner and the solar photovoltaic device, efficient conversion and utilization of energy is achieved.

[0035] Optionally, a distillation device 4 is provided between the generator 11 and the condenser 12. Before the ammonia vapor generated by the generator 11 enters the condenser 12, it is purified by the distillation device 4, which can effectively remove water vapor entrained in the ammonia vapor and prevent it from condensing in the condenser 12 and the evaporator 13, thereby affecting the heat transfer efficiency. At the same time, the purity of the refrigerant is improved, so that the system can operate at a lower pressure, reduce energy consumption, and extend the service life of the system.

[0036] Optionally, a liquid storage device 6 and a first supercooling device 51 are sequentially arranged between the condenser 12 and the first throttling device 31. The main function of the liquid storage device 6 is to store the liquid refrigerant produced in the condenser 12 to ensure a stable supply of refrigerant when the system is running. The liquid ammonia passes through the condenser 12 and enters the first supercooling device 51, exchanges heat with the ammonia gas in the evaporator 13 to become supercooled liquid ammonia, and then enters the evaporator 13 after passing through the first throttling device 31.

[0037] Optionally, a gas-liquid separation device 7 is provided between the first supercooling device 51 and the absorber 14. After the liquid ammonia passes through the first supercooling device 51, due to changes in pressure or temperature, part of the liquid ammonia may be converted into ammonia gas to form a gas-liquid mixture. The main function of the gas-liquid separation device 7 is to separate the gas and liquid in the gas-liquid mixture to ensure that only pure liquid refrigerant enters the evaporator 13.

[0038] Optionally, the absorbent circulation pipeline is provided with a second supercooling device 52, and the second supercooling device 52 is connected to the solution pump 2. The concentrated solution coming out of the absorber 14 is cooled by the water-cooled low-temperature absorber 14 (cold water in, hot water out, heat is taken out by the circulating water and used for heating and heating hot water), and then pressurized by the solution pump 2 and sent to the distillation device 4.

[0039] Optionally, the absorbent circulation pipeline is provided with a second throttling device 32, and both the first throttling device 31 and the second throttling device 32 adopt electronic expansion valves, which adopt electronic expansion valves instead of traditional mechanical expansion valves. It can realize precise flow control according to the load of the evaporator 13. On the one hand, it can avoid excessive liquid ammonia entering the evaporator 13 and reduce liquid hammer; on the other hand, it can also avoid insufficient liquid ammonia supply, which causes excessive superheat at the outlet of the evaporator 13. That is, precise adjustment of the electronic expansion valve helps the system to operate flexibly and efficiently under variable working conditions.

[0040] Optionally, a defrost valve 8 for defrosting the evaporator 13 is included, and the defrost valve 8 is arranged between the generator 11 and the evaporator 13; or the defrost valve 8 is arranged between the absorber 14 and the evaporator 13.

[0041] Specifically, when the defrost valve 8 is disposed between the generator 11 and the evaporator 13, by adjusting the opening of the defrost valve 8, the high-temperature and high-pressure gaseous refrigerant of the generator 11 can flow to the evaporator 13, thereby changing the surface temperature of the evaporator 13 and achieving the purpose of defrosting. The specific defrosting operation can be adjusted according to the density and distribution of the frost layer on the surface of the evaporator 13. For example, when the frost layer is thin or unevenly distributed, the opening of the defrost valve 8 can be reduced to reduce the refrigerant flow rate and prolong the residence time of the refrigerant in the evaporator 13 to more fully melt the frost layer.

[0042] Specifically, when the defrost valve 8 is arranged between the absorber 14 and the evaporator 13, the dilute solution in the absorber 14 dissolves and absorbs the ammonia from the second supercooling device 52 and releases a large amount of heat to become an ammonia concentrated solution. The concentrated solution coming out of the absorber 14 is cooled by the water-cooled low-temperature absorber 14, that is, cold water enters and hot water exits. The heat is taken out by the circulating water and can flow to the evaporator 13 through the defrost valve 8 to be used for defrosting the surface of the evaporator 13.

[0043] In summary, the operating conditions of the air source absorption heat pump system provided in this application are as follows:

[0044] Absorbent circulation: In the generator 11, the concentrated ammonia solution is heated by the fuel gas. After the ammonia gas is continuously evaporated from the concentrated ammonia solution, the concentration of the solution is reduced to become a high-temperature dilute solution. After heat exchange and cooling, it enters the absorber 14 through the second throttling device 32. In the absorber 14, the dilute solution dissolves and absorbs the ammonia gas from the second throttling device 32 and releases a large amount of heat to become an ammonia concentrated solution. The concentrated solution coming out of the absorber 14 is cooled by the water-cooled low-temperature absorber 14 (cold water in, hot water out, heat is taken out by circulating water for heating and heating hot water), and then pressurized by the solution pump 2 and sent to the distillation device 4. After the concentrated solution is heated, a part of it directly enters the stripping section of the generator 11, and a part of it enters the GAX high-efficiency heat exchanger of the falling film absorber 14 for heat exchange. After heat exchange, both parts of the concentrated solution return to the generator 11 and enter the next absorbent cycle.

[0045] Refrigerant cycle: In the generator 11, the concentrated ammonia solution is heated by the high temperature of the gas or the solar photovoltaic device, and the high-temperature and high-pressure ammonia gas is continuously evaporated; the high-temperature and high-pressure ammonia gas enters the condenser 12 after being rectified by the distillation device 4, and is cooled by the water-cooled heat exchanger in the condenser 12 (the heat is taken out by the circulating water and used for heating and heating hot water), and then condensed into liquid ammonia enters the first supercooling device 51, exchanges heat with the ammonia gas from the evaporator 13 to become supercooled liquid ammonia, and enters the evaporator 13 after throttling by the first throttling device 31, absorbs the heat in the air and is converted into ammonia gas, and then enters the absorber 14 to be absorbed by the dilute solution, becomes a concentrated solution, and is pumped into the generator 11 to enter the next refrigerant cycle.

[0046] Some exemplary embodiments of the utility model are described above, but those skilled in the art will appreciate that changes may be made to these exemplary embodiments without departing from the principles or spirit of the utility model, and the scope of the utility model is defined by the claims and their equivalents.

Claims

1. An air source absorption heat pump system, characterized in that: include: The invention comprises a refrigerant circulation pipeline and an absorbent circulation pipeline, wherein a generator (11), a condenser (12), an evaporator (13) and an absorber (14) are sequentially installed and connected on the refrigerant circulation pipeline, and a first throttling device (31) is arranged between the condenser (12) and the evaporator (13); the absorbent circulation pipeline is arranged between the generator (11) and the absorber (14); a solution pipeline is arranged between the absorber (14) and the generator (11), and a solution pump (2) is arranged on the solution pipeline.

2. The air source absorption heat pump system according to claim 1, characterized in that: A burner is installed in the generator (11), and the burner is connected to the gas pipeline.

3. The air source absorption heat pump system according to claim 1, characterized in that: It also comprises a solar photovoltaic device, wherein the solar photovoltaic device is connected to a storage battery, and the storage battery is connected to the generator (11).

4. The air source absorption heat pump system according to claim 1, characterized in that: A distillation device (4) is provided between the generator (11) and the condenser (12).

5. The air source absorption heat pump system according to claim 1, characterized in that: A liquid storage device (6) and a first supercooling device (51) are sequentially arranged between the condenser (12) and the throttling device.

6. The air source absorption heat pump system according to claim 5, characterized in that: A gas-liquid separation device (7) is provided between the first subcooling device (51) and the absorber (14).

7. The air source absorption heat pump system according to claim 1, characterized in that: The absorbent circulation pipeline is provided with a second throttling device (32).

8. The air source absorption heat pump system according to claim 1, characterized in that: The absorbent circulation pipeline is provided with a second supercooling device (52), and the second supercooling device (52) is connected to the solution pump (2).

9. The air source absorption heat pump system according to claim 7, characterized in that: Both the first throttling device (31) and the second throttling device (32) are electronic expansion valves.

10. The air source absorption heat pump system according to claim 1, characterized in that: It comprises a defrost valve (8) for defrosting the evaporator (13), wherein the defrost valve (8) is arranged between the generator (11) and the evaporator (13); or the defrost valve (8) is arranged between the absorber (14) and the evaporator (13).

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