Air source and steam hybrid heat pump system

Abstract

The invention discloses an air source and fuel gas hybrid heat pump system, and belongs to the technical field of heat supply. The system is provided with an air source heat pump and a steam type absorption heat pump; the energy storage water tank is connected between the air source heat pump and the steam type absorption heat pump, and the plate heat exchanger is connected between the steam type absorption heat pump and a heat consumer; wherein an outlet of the plate heat exchanger is connected with an inlet of the steam type absorption heat pump, then an outlet of the steam type absorption heat pump is connected with an inlet of the plate heat exchanger so as to form a loop, and an inlet and an outlet of the energy storage water tank are both communicated with a loop pipeline. The air source heat pump and the steam type absorption heat pump are organically combined, and efficient operation of the system under different load conditions is achieved by means of the dual energy advantages of off-peak electricity and steam.

Description

Technical Field

[0001] The present invention relates to the technical field of heating, and particularly to an air source and steam hybrid heat pump system. Background Art

[0002] With the intensification of the global energy crisis and environmental problems, the high consumption and high pollution problems of traditional energy have become increasingly prominent, driving the urgent need for clean energy and efficient energy utilization technologies.

[0003] In the fields of building heating and hot water supply, although traditional gas boilers and electric heating equipment are technically mature, their energy utilization efficiency is relatively low and their carbon emissions are relatively high, making it difficult to meet the requirements of energy conservation and emission reduction. Air source heat pumps have the characteristics of high efficiency and environmental protection, but their heating efficiency decreases in low-temperature environments and they rely on electric drive; while steam absorption heat pumps can utilize the high calorific value of heat sources such as steam to provide a stable heat source, but their energy efficiency ratio (COP) during independent operation is relatively low.

[0004] Therefore, based on the above problems, how to combine the advantages of air source heat pumps and steam absorption heat pumps to form a hybrid heat pump system has become the key to solving the above problems. Summary of the Invention

[0005] The object of the present invention is to overcome the defects existing in the prior art and provide an air source and steam hybrid heat pump system. By organically combining an air source heat pump and a steam absorption heat pump, the dual energy advantages of off-peak electricity and steam are utilized to achieve the efficient operation of the system under different load conditions.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] The air source and steam hybrid heat pump system disclosed by the present invention includes:

[0008] An air source heat pump, a steam absorption heat pump; and

[0009] An energy storage water tank connected between the air source heat pump and the steam absorption heat pump, and a plate heat exchanger connected between the steam absorption heat pump and the heat user;

[0010] Wherein, the outlet of the plate heat exchanger is connected to the inlet of the steam absorption heat pump, and then the outlet of the steam absorption heat pump is connected to the inlet of the plate heat exchanger to form a loop, and both the inlet and outlet of the energy storage water tank are communicated with the loop pipeline.

[0011] Further, a parallel flow is adopted in the solution circuit of the steam-type absorption heat pump. Among them, the outlet of one absorber of the steam-type absorption heat pump is connected to a high-temperature solution heat exchanger and a high-pressure generator in sequence through a dilute solution pipeline b, and the outlet of the other absorber is connected to a low-temperature solution heat exchanger, a condensate heat exchanger, and a low-pressure generator in sequence through a dilute solution pipeline b.

[0012] Further, the outlet of the high-pressure generator is connected to the inlet of the high-temperature solution heat exchanger through a concentrated solution pipeline c, the outlet of the low-pressure generator is connected to the inlet of the low-temperature solution heat exchanger through a concentrated solution pipeline c, and the outlets of the high-temperature solution heat exchanger and the low-temperature solution heat exchanger converge into one path through a concentrated solution pipeline c and are connected to the inlet of the absorber.

[0013] Further, the outlet of the low-pressure generator is connected to the inlet of condenser II, the outlet of condenser II is connected to the inlet of evaporator II through a refrigerant pipeline d, and the outlet of evaporator II is connected to the inlet of the absorber.

[0014] Further, the energy storage water tank is connected to evaporator II through a cold water pipeline f, and a cold water valve is arranged on the cold water pipeline f.

[0015] Further, the outlet of the plate heat exchanger is connected to the inlets of the absorber and condenser II in sequence through a cooling water pipeline h, and then returns to the inlet of the plate heat exchanger. Among them, the inlet and outlet cold water pipeline f of the energy storage water tank is connected to the outlet cooling water pipeline h of condenser II and the outlet cooling water pipeline h of the plate heat exchanger through a tee.

[0016] Further, high-temperature steam enters the high-pressure generator through a steam pipeline g, and the high-pressure generator is connected to the condensate heat exchanger through a steam pipeline g.

[0017] Further, the high-pressure generator is connected to the low-pressure generator through a refrigerant vapor pipeline e, and a refrigerant valve is arranged on the refrigerant vapor pipeline e between the high-pressure generator and the low-pressure generator.

[0018] Further, a solution valve is arranged on the solution pipeline between the high-temperature solution heat exchanger and the absorber. The outlet of the absorber is connected to the inlet of the solution pump, and the outlet of the solution pump is connected to the inlet of the low-temperature solution heat exchanger.

[0019] Further, the air source heat pump has a condenser I. The refrigerant water outlet of the condenser I is connected to an expansion valve through a refrigerant water pipe a. A filter is provided on the pipe between the condenser I and the expansion valve. The outlet of the expansion valve is connected to the inlet of an evaporator I. The outlet of the evaporator I is connected to the inlet of a compressor. The outlet of the compressor is connected to the inlet of the condenser I. The condenser I is connected to the energy storage water tank through a pipe.

[0020] In the above technical solution, for the air source and steam hybrid heat pump system provided by the present invention, the beneficial effects are:

[0021] For the air source and steam hybrid heat pump system designed by the present invention, firstly, the energy storage water tank is connected between the air source heat pump and the steam absorption heat pump, and the plate heat exchanger is connected between the steam absorption heat pump and the heat user. The air source heat pump and the steam absorption heat pump are organically combined.

[0022] Secondly, the outlet of the plate heat exchanger is connected to the inlet of the steam absorption heat pump, and then the outlet of the steam absorption heat pump is connected to the inlet of the plate heat exchanger to form a loop. Both the inlet and outlet of the energy storage water tank are communicated with the loop pipeline.

[0023] This system can not only make full use of the condensation heat of the air source heat pump in series mode under high load to improve the energy efficiency of the steam absorption heat pump, but also flexibly distribute heat in parallel mode under low load to ensure the high efficiency and economy of the system. In addition, the system also introduces waste heat recovery technology to further improve the energy utilization efficiency and reduce energy waste. Description of the Drawings

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments recorded in the present invention. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings.

[0025] Figure 1 It is the schematic diagram of the air source and steam hybrid heat pump system disclosed by the present invention.

[0026] Description of the Reference Numerals:

[0027] 1. Condenser I; 2. Low-pressure generator; 3. Filter; 4. Compressor; 5. Expansion valve; 6. Evaporator I; 7. Refrigerant valve; 8. High-pressure generator; 9. Condensate heat exchanger; 10. High-temperature solution heat exchanger; 11. Solution valve; 12. Low-temperature solution heat exchanger; 13. Refrigerant pump; 14. Evaporator II; 15. Solution pump; 16. Absorber; 17. Plate heat exchanger; 18. Energy storage water tank; 19. Cold water valve; 20. Condenser II; 21. Three-way joint

[0028] 100. Air source heat pump; 200. Steam-fired absorption heat pump

[0029] a. Refrigerant water pipe; b. Weak solution pipeline; c. Strong solution pipeline; d. Refrigerant pipeline; e. Refrigerant vapor pipeline; f. Cold water pipeline; g. Steam pipeline; h. Cooling water pipe Detailed implementation mode

[0030] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further introduced in detail below with reference to the accompanying drawings

[0031] See Figure 1 as shown

[0032] The air source and steam hybrid heat pump system of the invention includes: an air source heat pump 100, an energy storage water tank 18, a steam-fired absorption heat pump 200 and a plate heat exchanger 17

[0033] The energy storage water tank 18 is connected between the air source heat pump 100 and the steam-fired absorption heat pump 200, and the plate heat exchanger 17 is connected between the steam-fired absorption heat pump 200 and the heat user. The working medium uses an environmentally friendly refrigerant and lithium bromide solution. Among them, the outlet of the plate heat exchanger 17 is connected to the inlet of the steam-fired absorption heat pump 200, and then the outlet of the steam-fired absorption heat pump 200 is connected to the inlet of the plate heat exchanger 17, thus forming a loop. Both the inlet and outlet of the energy storage water tank 18 are communicated with the loop pipeline. That is to say, the inlet of the energy storage water tank 18 is communicated with the pipeline on the loop that enters the inlet of the steam-fired absorption heat pump 200, and the outlet of the energy storage water tank 18 is communicated with the pipeline on the loop that exits the outlet of the steam-fired absorption heat pump 200

[0034] In a specific embodiment, see Figure 1 as shown, the air source heat pump 100 includes a condenser I 1, a filter 3, a compressor 4, an expansion valve 5 and an evaporator I 6

[0035] In the air source heat pump 100, the refrigerant water outlet of the condenser I 1 is connected to the expansion valve 5 through the refrigerant water pipe a, and the filter 3 is arranged on the pipeline between the condenser I 1 and the expansion valve 5; the outlet of the expansion valve 5 is connected to the inlet of the evaporator I 6; the outlet of the evaporator I 6 is connected to the inlet of the compressor 4; the outlet of the compressor 4 is connected to the inlet of the condenser I 1; the condenser I 1 is connected to the energy storage water tank 17 through a pipeline.

[0036] The steam type absorption heat pump 200 includes a low-pressure generator 2, a condenser II 20, an absorber 16, an evaporator II 14, a high-pressure generator 8, a condensate heat exchanger 9, a high-temperature solution heat exchanger 10, a low-temperature solution heat exchanger 12, a refrigerant valve 7, a solution valve 11, a cold water valve 19, a refrigerant pump 13 and a solution pump 15;

[0037] In the steam type absorption heat pump 200, the solution circuit adopts a parallel flow. One outlet of the absorber 16 is sequentially connected to the high-temperature solution heat exchanger 10 and the high-pressure generator 8 through the dilute solution pipeline b, and the other outlet of the absorber 16 is sequentially connected to the low-temperature solution heat exchanger 12, the condensate heat exchanger 9 and the low-pressure generator 2 through the dilute solution pipeline b. The solution valve 11 is arranged on the solution pipeline between the high-temperature solution heat exchanger 10 and the absorber 16. The outlet of the absorber 16 is connected to the inlet of the solution pump 15, and the outlet of the solution pump 15 is connected to the inlet of the low solution heat exchanger 12;

[0038] The outlet of the high-pressure generator 8 is connected to the inlet of the high-temperature solution heat exchanger 10 through the concentrated solution pipeline c, and the outlet of the low-pressure generator 2 is connected to the inlet of the low-temperature solution heat exchanger 12 through the concentrated solution pipeline c. The outlets of the high-temperature solution heat exchanger 10 and the low-temperature solution heat exchanger 12 converge into one path through the concentrated solution pipeline c and are connected to the inlet of the absorber 16. High-temperature steam enters the high-pressure generator 8 through the steam pipeline g, and the high-pressure generator 8 is connected to the condensate heat exchanger 9 through the steam pipeline g;

[0039] The high-pressure generator 8 is connected to the low-pressure generator 2 through the refrigerant vapor pipeline e. The refrigerant valve 7 is arranged on the pipeline between the high-pressure generator 8 and the low-pressure generator 2. The outlet of the low-pressure generator 2 is connected to the inlet of the condenser II 20. The outlet of the condenser II 20 is connected to the inlet of the evaporator II 14 through the refrigerant pipeline d. The outlet of the evaporator II 14 is connected to the inlet of the absorber 16. A refrigerant pump 13 is arranged on the refrigerant pipeline d at the outlet of the evaporator II 14.

[0040] The energy storage water tank 18 is connected to the evaporator II 14 through the cold water pipeline f, and the cold water valve 19 is arranged on the cold water pipeline f; the outlet of the plate heat exchanger 17 is connected to the inlets of the absorber 16 and the condenser II 20 in sequence through the cooling water pipeline h, and then returns to the inlet of the plate heat exchanger 17; the inlet and outlet cold water pipeline f of the energy storage water tank 18 is connected to the outlet cooling water pipeline h of the condenser II 20 and the outlet cooling water pipeline h of the plate heat exchanger 17 through a tee 21.

[0041] In the above technical solution, an air source and steam hybrid heat pump system provided by the present invention has a working principle, and the system operation modes can be divided into a series hybrid operation mode and a parallel hybrid operation mode.

[0042] Series operation mode: When operating at high load, the cold water valve 19, the refrigerant valve 7, and the solution valve 11 are opened. The air source heat pump 100 drives the compressor 4 to generate refrigerant steam by using off-peak electricity and enters the condenser I 1. The condensation heat generated in the condenser I 1 is stored in the hot water storage tank 18. The hot water storage tank 18 is connected to the evaporator II 14 of the steam-type absorption heat pump 200. During the peak electricity period, the compression air source heat pump 100 is deactivated. The heat of the hot water storage tank 18 is all provided to the evaporator II 14 for the evaporation of the refrigerant. The chilled water that has provided the heat returns to the hot water storage tank 18 to complete the chilled water cycle; the cooling water is provided by the plate heat exchanger 17 and flows in a series process, and its temperature rises after passing through the absorber 16 and the condenser II 20 in sequence, and then returns to the plate heat exchanger 17 to provide heat for users.

[0043] Parallel operation mode: When operating at low load, the cold water valve 19, the refrigerant valve 7, and the solution valve 11 are opened. According to the heat distribution principle of 3:2, the condensation heat generated by the air source heat pump 100 is used to provide heat for users by the air source heat pump 100 and the steam-type absorption heat pump 200 at the same time. Specifically, the condensation heat generated by the air source heat pump 100 is divided into two paths. 2 / 5 of the heat is used to provide the energy required for evaporation for the evaporator II 14 of the steam-type absorption heat pump 200, and 3 / 5 of the heat is directly mixed with the heated cooling water through the tee 21 and then enters the plate heat exchanger 17 to provide heat for users.

[0044] This system organically combines the air source heat pump and the steam-type absorption heat pump, utilizes the dual energy advantages of off-peak electricity and steam, and realizes the efficient operation of the system under different load conditions. This system can not only make full use of the condensation heat of the air source heat pump through the series mode at high load to improve the energy efficiency of the steam-type absorption heat pump, but also flexibly distribute heat through the parallel mode at low load to ensure the high efficiency and economy of the system. In addition, the system also introduces the waste heat recovery technology, which further improves the energy utilization efficiency and reduces energy waste;

[0045] Only certain exemplary embodiments of the present invention have been described by way of illustration. Without doubt, for those of ordinary skill in the art, the described embodiments can be modified in various different ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and description are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. Air source and steam hybrid heat pump system, characterized in that, Including: an air source heat pump (100), a steam absorption heat pump (200); and a heat storage water tank (18) connected between the air source heat pump (100) and the steam absorption heat pump (200), and a plate heat exchanger (17) connected between the steam absorption heat pump (200) and a heat user; wherein, the outlet of the plate heat exchanger (17) is connected to the inlet of the steam absorption heat pump (200), and then the outlet of the steam absorption heat pump (200) is connected to the inlet of the plate heat exchanger (17) to form a loop, and both the inlet and outlet of the heat storage water tank (18) are communicated with the loop pipeline.

2. The air source and steam hybrid heat pump system according to claim 1, characterized in that: In the steam absorption heat pump (200), the solution loop adopts a parallel flow. Among them, the outlet of one absorber (16) of the steam absorption heat pump (200) is sequentially connected to a high-temperature solution heat exchanger (10) and a high-pressure generator (8) through a dilute solution pipeline b, and the outlet of the other absorber (16) is sequentially connected to a low-temperature solution heat exchanger (12), a condensate heat exchanger (9) and a low-pressure generator (2) through a dilute solution pipeline b.

3. The air source and steam hybrid heat pump system according to claim 2, characterized in that: The outlet of the high-pressure generator (8) is connected to the inlet of the high-temperature solution heat exchanger (10) through a concentrated solution pipeline c, the outlet of the low-pressure generator (2) is connected to the inlet of the low-temperature solution heat exchanger (12) through a concentrated solution pipeline c, and the outlets of the high-temperature solution heat exchanger (10) and the low-temperature solution heat exchanger (12) converge into one path through a concentrated solution pipeline c and are connected to the inlet of the absorber (16).

4. The air source and steam hybrid heat pump system according to claim 2 or 3, characterized in that: The outlet of the low-pressure generator (2) is connected to the inlet of a condenser II (20), the outlet of the condenser II (20) is connected to the inlet of an evaporator II (14) through a refrigerant pipeline d, and the outlet of the evaporator II (14) is connected to the inlet of the absorber (16).

5. The air source and steam hybrid heat pump system according to claim 4, characterized in that: The heat storage water tank (18) is connected to the evaporator II (14) through a cold water pipeline f, and a cold water valve (19) is arranged on the cold water pipeline f.

6. The air source and steam hybrid heat pump system according to claim 5, characterized in that: The outlet of the plate heat exchanger (17) is sequentially connected to the inlets of the absorber (16) and the condenser II (20) through a cooling water pipeline h and then returns to the inlet of the plate heat exchanger (17). Among them, the inlet and outlet of the heat storage water tank (18) are connected to the outlet cooling water pipeline h of the condenser II (20) and the outlet cooling water pipeline h of the plate heat exchanger (17) through a tee (21) on the cold water pipeline f.

7. The air source and steam hybrid heat pump system according to claim 2 or 3, characterized in that: High-temperature steam enters the high-pressure generator (8) through the steam pipeline g, and the high-pressure generator (8) is connected to the condensate heat exchanger (9) through the steam pipeline g.

8. The air source and steam hybrid heat pump system according to claim 2 or 3, characterized in that: The high-pressure generator (8) is connected to the low-pressure generator (2) through the refrigerant vapor pipeline e, and the refrigerant valve (7) is arranged on the refrigerant vapor pipeline e between the high-pressure generator (8) and the low-pressure generator (2).

9. The air source and steam hybrid heat pump system according to claim 2, characterized in that: A solution valve (11) is arranged on the solution pipeline between the high-temperature solution heat exchanger (10) and the absorber (16), the outlet of the absorber (16) is connected to the inlet of the solution pump (15), and the outlet of the solution pump (15) is connected to the inlet of the low-temperature solution heat exchanger (12).

10. The air source and steam hybrid heat pump system according to claim 1, characterized in that: The air source heat pump (100) has a condenser I (1), the refrigerant water outlet of the condenser I (1) is connected to the expansion valve (5) through the refrigerant water pipe a, a filter (3) is arranged on the pipeline between the condenser I (1) and the expansion valve (5), the outlet of the expansion valve (5) is connected to the inlet of the evaporator I (6), the outlet of the evaporator I (6) is connected to the inlet of the compressor (4), the outlet of the compressor (4) is connected to the inlet of the condenser I (1), and the condenser I (1) is connected to the energy storage water tank (18) through a pipeline.

Images