Heating system of air-cooled heat pump coupled gas-fired boiler

Abstract

A heating system with an air-cooled heat pump coupled with a gas-fired boiler comprises the air-cooled heat pump, the gas-fired boiler and a flue gas heat exchanger. A heating circulating water pump and a first valve are sequentially arranged on a heating inlet pipeline of the air-cooled heat pump along a flowing path of air-conditioning water; a heating outlet of the air-cooled heat pump is connected with a hot water supply end pipeline through a second valve; the heating inlet end of the gas-fired boiler is at least divided into two branches, and one branch is connected to the section, between the heating circulating water pump and the first valve, of the pipeline through a third valve; the other branch is connected to the section, between the second valve and the heating outlet of the air-cooled heat pump, of the pipeline through a fourth valve; the heating outlet end of the gas boiler is connected with the hot water supply end through a fifth valve in a pipeline mode. On one hand, the heating guarantee problem of a single heating system is solved, the problems of heating attenuation and instability of the air-cooled heat pump in a low-temperature environment are also solved, and the quality of the heating system is greatly improved; on the other hand, white smoke can be eliminated.

Description

Technical Field

[0001] The utility model relates to an air-conditioning heating system, in particular to a heating system of an air-cooled heat pump coupled with a gas boiler. Background Art

[0002] As a clean heating technology, air-cooled heat pumps are increasingly being promoted. However, the existing air-cooled heat pump units are inefficient when operating at lower ambient temperatures in winter, and may even fail to start normally. Gas boilers can be used as supplementary heating equipment for air-cooled heat pumps because of their stable heating. After combustion, the flue gas of a gas boiler often contains a lot of water vapor, and there is a phenomenon of "white smoke". Currently, a common technology for eliminating white smoke is to reduce the flue gas temperature to below 30°C and condense the water vapor in the flue gas into water for precipitation. However, a separate water-cooled air-conditioning unit is required. When the gas boiler is not enabled, the water-cooled air-conditioning unit is often idle and cannot be fully utilized. Therefore, this application urgently needs to design a new heating system, which not only solves the heating guarantee problem of a single heating system and the heating attenuation and instability problems of air-cooled heat pumps in low-temperature environments, but also solves the white smoke problem. Utility Model Content

[0003] The purpose of the utility model is to overcome the above-mentioned deficiencies of the prior art and provide a heating system of an air-cooled heat pump coupled to a gas boiler with a simple structure, which can operate different systems according to different needs, thereby achieving stable operation and eliminating white smoke.

[0004] The technical solution of the utility model is: a heating system of an air-cooled heat pump coupled with a gas boiler, comprising an air-cooled heat pump, a gas boiler and a flue gas heat exchanger; a heating circulation water pump and a first valve are sequentially arranged along the flow path of air-conditioning water on the heating inlet pipeline of the air-cooled heat pump; the heating outlet of the air-cooled heat pump is connected to the hot water supply end pipeline via the second valve; the heating inlet end of the gas boiler is divided into at least two branches, one branch is connected to the section of the pipeline between the heating circulation water pump and the first valve via the third valve; the other branch is connected to the section of the pipeline between the second valve and the heating outlet of the air-cooled heat pump via the fourth valve; the heating outlet end of the gas boiler is connected to the hot water supply end pipeline via the fifth valve.

[0005] Furthermore, the flue gas outlet of the gas boiler is connected to the flue gas heat exchanger via a smoke pipe; the water outlet of the flue gas heat exchanger is connected to the refrigeration inlet pipeline of the air-cooled heat pump via a waste heat recovery circulating water pump; the water inlet of the flue gas heat exchanger is connected to the refrigeration outlet pipeline of the air-cooled heat pump.

[0006] Furthermore, the air-cooled heat pump, heating circulating water pump, second valve and first valve are connected through a water pipeline to form an air-cooled heat pump heating system; the gas boiler, heating circulating water pump, third valve and fifth valve are connected through a water pipeline to form a gas boiler heating system.

[0007] Furthermore, the air-cooled heat pump, waste heat recovery circulating water pump, flue gas heat exchanger, and smoke pipe are connected through a water pipeline to form a flue gas waste heat recovery and white smoke elimination system.

[0008] Furthermore, the air-cooled heat pump heating system, the gas boiler heating system and the fourth valve are connected through a water pipeline to form an air-cooled heat pump and a gas boiler series or parallel coupled heating system.

[0009] Furthermore, when the third valve, the fifth valve, the second valve and the first valve are opened and the fourth valve is closed, a parallel coupling heating system of an air-cooled heat pump and a gas boiler is formed between the air-cooled heat pump heating system and the gas boiler heating system; when the fourth valve, the fifth valve and the first valve are opened and the third valve and the second valve are closed, a series coupling heating system of an air-cooled heat pump and a gas boiler is formed between the air-cooled heat pump heating system and the gas boiler heating system.

[0010] Furthermore, when the second valve and the first valve are opened and the fourth valve, the third valve and the fifth valve are closed, the air-cooled heat pump heating system works independently; when the third valve and the fifth valve are opened and the fourth valve, the second valve and the first valve are closed, the gas boiler heating system works independently.

[0011] Furthermore, the air-cooled heat pump adopts a four-pipe air-cooled heat pump that can cool and heat at the same time; the flue gas heat exchanger adopts a water-cooled flue gas heat exchanger.

[0012] Furthermore, the first to fifth valves are electric valves.

[0013] Furthermore, the heating inlet of the air-cooled heat pump is connected to the air-conditioning water output end via a pipeline, and the heating circulation water pump and the first valve are sequentially arranged on the pipeline along the air-conditioning water flow path.

[0014] The beneficial effects of the utility model are as follows: on the one hand, by arranging a water pipe connection structure between the air-cooled heat pump, the gas boiler and the five valves, it can not only meet the independent operation of the air-cooled heat pump heating system and the gas boiler heating system, but also form a series or parallel coupled heating system of the air-cooled heat pump and the gas boiler, so that the present invention not only solves the heating guarantee problem of a single heating system, but also solves the heating attenuation and instability problems of the air-cooled heat pump in a low temperature environment, greatly improves the quality of the heating system, and realizes the stable operation of the system; on the other hand, by arranging a flue gas heat exchanger between the air-cooled heat pump heating system and the gas boiler heating system, the cold water of the air-cooled heat pump can be fully utilized to reduce the flue gas output by the gas boiler to below 30°C, thereby eliminating white smoke, and the cold water of the air-cooled heat pump can be heated after heat exchange with the flue gas, and then can be heat exchanged with the air-conditioning water to form a cycle, thereby greatly improving the heat exchange efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 Schematic diagram of a heating system of an air-cooled heat pump coupled to a gas boiler according to an embodiment of the present invention;

[0016] Figure 2 is a schematic diagram of the operation of the air-cooled heat pump heating system according to an embodiment of the present invention (solid line portion);

[0017] Figure 3 is a schematic diagram of the operation of the gas boiler heating system according to an embodiment of the present invention (solid line portion);

[0018] Figure 4 is a schematic diagram of the operation of a parallel-coupled heating system of an air-cooled heat pump and a gas boiler according to an embodiment of the present invention (solid line portion);

[0019] Figure 5 Schematic diagram of the operation of a heating system in which an air-cooled heat pump and a gas boiler are coupled in series according to an embodiment of the present invention (solid line portion).

[0020] Description of reference numerals:

[0021] 1. Air-cooled heat pump; 2. Flue gas heat exchanger; 3. Gas boiler; 4. Fourth valve; 5. Third valve; 6. Fifth valve; 7. Second valve; 8. First valve; 9. Heating circulating water pump; 10. Waste heat recovery circulating water pump; 11. Smoke pipe; 31. Heating inlet; 32. Heating outlet; 33. Refrigeration inlet; 34. Refrigeration outlet. DETAILED DESCRIPTION

[0022] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0023] like Figure 1As shown: A heating system of an air-cooled heat pump coupled with a gas boiler, comprising an air-cooled heat pump 3, a gas boiler 1 and a flue gas heat exchanger 2; the air-cooled heat pump 3 is provided with a heating inlet 31, a heating outlet 32, a cooling inlet 33 and a cooling outlet 34. Among them, a heating circulation water pump 9 and a first valve 8 are sequentially provided on the heating inlet pipeline of the air-cooled heat pump 3 along the flow path of the air-conditioning water; the heating outlet 32 ​​of the air-cooled heat pump 3 is connected to the hot water supply end pipeline through the second valve 7. The heating inlet end of the gas boiler 1 is divided into two branches, one branch is connected to the section of the pipeline between the heating circulation water pump 9 and the first valve 8 through the third valve 5; the other branch is connected to the section of the pipeline between the second valve 7 and the heating outlet 32 ​​of the air-cooled heat pump through the fourth valve 4. The heating outlet end of the gas boiler 1 is connected to the hot water supply end pipeline through the fifth valve 6. The flue gas outlet of the gas boiler 1 is connected to the flue gas heat exchanger 2 via the smoke pipe 11; the water outlet of the flue gas heat exchanger 2 is connected to the refrigeration inlet 33 of the air-cooled heat pump 3 via the waste heat recovery circulating water pump 10; the water inlet of the flue gas heat exchanger 2 is connected to the refrigeration outlet 34 of the air-cooled heat pump 3 via the pipeline.

[0024] In this embodiment, the air-cooled heat pump 3, the heating circulating water pump 9, the second valve 7, and the first valve 8 are connected through a water pipeline to form an air-cooled heat pump heating system. The gas boiler 1, the heating circulating water pump 9, the third valve 5, and the fifth valve 6 are connected through a water pipeline to form a gas boiler heating system. The air-cooled heat pump 3, the waste heat recovery circulating water pump 10, the flue gas heat exchanger 2, and the smoke pipe 11 are connected through a water pipeline to form a flue gas waste heat recovery and white smoke elimination system. Among them, the air-cooled heat pump heating system, the gas boiler heating system, and the fourth valve 4 are connected through a water pipeline to form an air-cooled heat pump and a gas boiler series or parallel coupling heating system.

[0025] In this embodiment, the air-cooled heat pump adopts a four-pipe air-cooled heat pump that can cool and heat at the same time. The flue gas heat exchanger adopts a water-cooled flue gas heat exchanger, and cold water is provided by the air-cooled heat pump to reduce the flue gas temperature to 30°C, eliminate water vapor in the flue gas, thereby achieving the effect of eliminating white smoke, and at the same time absorb heat in the flue gas through the flue gas heat exchanger.

[0026] In this embodiment, the first valve to the fifth valve are preferably electric valves.

[0027] In this embodiment, the air-cooled heat pump heating system and the gas boiler heating system can operate independently, form an air-cooled heat pump and a gas boiler parallel coupling heating system, or form an air-cooled heat pump and a gas boiler series coupling heating system. Among them, the air-cooled heat pump and the gas boiler parallel coupling heating system is that the air-cooled heat pump and the gas boiler are running at the same time, and the circulating water provided by the heating circulating water pump 9 is distributed to the air-cooled heat pump 3 and the gas boiler 1 through the water pipeline at the same time. After the circulating water is heated, it is merged into the water pipeline. The air-cooled heat pump and the gas boiler series coupling heating system is that the air-cooled heat pump 3 and the gas boiler 1 are running at the same time. The circulating water provided by the heating circulating water pump flows to the air-cooled heat pump 3 through the water pipeline for primary heating, and then output from the air-cooled heat pump 3 to the gas boiler 1 for secondary heating to provide hot water with a higher temperature.

[0028] The working principle of this embodiment is:

[0029] (1) The air-cooled heat pump heating system works independently, such as Figure 2 As shown:

[0030] The second valve 7 and the first valve 8 are opened, the fourth valve 4, the third valve 5 and the fifth valve 6 are closed, the heating circulation water pump 9 is connected with the heating inlet 31 and the heating outlet 32 ​​of the air-cooling heat pump 3, and thus connected with the air-cooling heat pump 3, and the air-conditioning water is transported to the air-cooling heat pump 3 through the heating circulation water pump 9 for heating to provide hot water, and then transported to the hot water supply end through the heating outlet 32.

[0031] (2) The gas boiler heating system works independently, such as Figure 3 As shown:

[0032] The third valve 5 and the fifth valve 6 are opened, the fourth valve 4, the second valve 7 and the first valve 8 are closed, the heating circulation water pump 9 is connected to the gas boiler 1, and the air-conditioning water is transported to the gas boiler 1 through the heating circulation water pump 9 for heating to provide hot water, and then is transported to the hot water supply end through the heating outlet end of the gas boiler 1.

[0033] (3) The air-cooled heat pump and gas boiler are coupled in parallel to form a heating system, such as Figure 4 As shown:

[0034] The third valve 5, the fifth valve 6, the second valve 7, and the first valve 8 are opened, and the fourth valve 4 is closed. The heating circulation water pump 9 is connected to the heating inlet 31 and the heating outlet 32 ​​of the air-cooling heat pump 3, thereby connecting to the air-cooling heat pump 3. At the same time, the heating circulation water pump 9 is also connected to the gas boiler 1. In addition, the waste heat recovery circulation water pump 10 is connected to the cooling inlet 33 and the cooling outlet 34 of the air-cooling heat pump 3, thereby connecting the air-cooling heat pump 3 and the flue gas heat exchanger 2. After passing through the heating circulation water pump 9, the air-conditioning water flows to the air-cooling heat pump 3 and the gas boiler 1 at the same time for heating, providing hot water, and is sent to the hot water supply end. The 7°C cold water generated after heat exchange with the air-conditioning water in the air-cooling heat pump 3 is sent to the flue gas heat exchanger 2, reducing the flue gas temperature in the smoke pipe 11 to below 30°C, thereby eliminating white smoke; and the cold water in the flue gas heat exchanger 2 that is heated by heat exchange with the flue gas enters the air-cooling heat pump 3 again for heat exchange with the air-conditioning water, forming a cycle.

[0035] (4) The air-cooled heat pump and gas boiler are coupled in series to form a heating system, such as Figure 5 As shown:

[0036] The fourth valve 4, the fifth valve 6, and the first valve 8 are opened, the third valve 5 and the second valve 7 are closed, and the heating circulation water pump 9 is connected with the heating inlet 31 and the heating outlet 32 ​​of the air-cooling heat pump 3, thereby connecting with the air-cooling heat pump 3. At the same time, the air-cooling heat pump 3 is connected with the gas boiler 1. In addition, the waste heat recovery circulation water pump 10 is connected with the cooling inlet 33 and the cooling outlet 34 of the air-cooling heat pump 3, thereby connecting the air-cooling heat pump 3 with the flue gas heat exchanger 2. After passing through the heating circulation water pump 9, the air-conditioning water first flows to the air-cooling heat pump 3 for primary heating, and the air-conditioning water heated by the air-cooling heat pump 3 flows to the gas boiler 1 for secondary heating to provide hot water and is sent to the hot water supply end. The cold water at 7°C generated after heat exchange with the air-conditioning water in the air-cooled heat pump 3 is supplied to the flue gas heat exchanger 2, reducing the flue gas temperature in the smoke pipe 11 to below 30°C, thereby eliminating white smoke; and the cold water in the flue gas heat exchanger 2 that is heated by heat exchange with the flue gas enters the air-cooled heat pump 3 again to exchange heat with the air-conditioning water, forming a cycle.

[0037] To summarize, on the one hand, the present invention can satisfy the independent operation of the air-cooled heat pump heating system and the gas boiler heating system by setting a water pipe connection structure between the air-cooled heat pump, the gas boiler and the five valves, and can also form a series or parallel coupled heating system of the air-cooled heat pump and the gas boiler, so that the present invention not only solves the heating guarantee problem of a single heating system, but also solves the heating attenuation and instability problems of the air-cooled heat pump in a low temperature environment, greatly improves the quality of the heating system, and realizes the stable operation of the system; on the other hand, by setting a flue gas heat exchanger between the air-cooled heat pump heating system and the gas boiler heating system, the cold water of the air-cooled heat pump can be fully utilized to reduce the flue gas output by the gas boiler to below 30°C, thereby eliminating white smoke, and the cold water of the air-cooled heat pump can be heated after heat exchange with the flue gas, and then can be heat exchanged with the air-conditioning water to form a cycle, thereby greatly improving the heat exchange efficiency.

Claims

1. A heating system of an air-cooled heat pump coupled with a gas boiler, characterized in that: It comprises an air-cooled heat pump, a gas boiler and a flue gas heat exchanger; a heating circulation water pump and a first valve are sequentially arranged on the heating inlet pipeline of the air-cooled heat pump along the flow path of air-conditioning water; the heating outlet of the air-cooled heat pump is connected to the hot water supply end pipeline via a second valve; the heating inlet end of the gas boiler is divided into at least two branches, one branch is connected to the section of the pipeline between the heating circulation water pump and the first valve via a third valve; the other branch is connected to the section of the pipeline between the second valve and the heating outlet of the air-cooled heat pump via a fourth valve; the heating outlet end of the gas boiler is connected to the hot water supply end pipeline via a fifth valve.

2. The air-cooled heat pump coupled gas boiler heating system according to claim 1, characterized in that: The flue gas outlet of the gas boiler is connected to the flue gas heat exchanger via a smoke pipe; the water outlet of the flue gas heat exchanger is connected to the refrigeration inlet pipeline of the air-cooled heat pump via a waste heat recovery circulating water pump; the water inlet of the flue gas heat exchanger is connected to the refrigeration outlet pipeline of the air-cooled heat pump.

3. The air-cooled heat pump coupled gas boiler heating system according to claim 1, characterized in that: The air-cooled heat pump, the heating circulating water pump, the second valve and the first valve are connected through a water pipeline to form an air-cooled heat pump heating system; the gas boiler, the heating circulating water pump, the third valve and the fifth valve are connected through a water pipeline to form a gas boiler heating system.

4. The air-cooled heat pump coupled gas boiler heating system according to claim 2, characterized in that: The air-cooled heat pump, the waste heat recovery circulating water pump, the flue gas heat exchanger, and the smoke pipe are connected through a water pipeline to form a flue gas waste heat recovery and white smoke elimination system.

5. The air-cooled heat pump coupled gas boiler heating system according to claim 3, characterized in that: The air-cooled heat pump heating system, the gas boiler heating system and the fourth valve are connected through a water pipeline to form an air-cooled heat pump and a gas boiler series or parallel coupled heating system.

6. The air-cooled heat pump coupled gas boiler heating system according to claim 5, characterized in that: When the third valve, the fifth valve, the second valve and the first valve are opened and the fourth valve is closed, the air-cooled heat pump heating system and the gas boiler heating system constitute a parallel coupling heating system of the air-cooled heat pump and the gas boiler; when the fourth valve, the fifth valve and the first valve are opened and the third valve and the second valve are closed, the air-cooled heat pump heating system and the gas boiler heating system constitute a series coupling heating system of the air-cooled heat pump and the gas boiler.

7. The air-cooled heat pump coupled gas boiler heating system according to claim 1, characterized in that: When the second valve and the first valve are opened and the fourth valve, the third valve and the fifth valve are closed, the air-cooled heat pump heating system works independently; when the third valve and the fifth valve are opened and the fourth valve, the second valve and the first valve are closed, the gas boiler heating system works independently.

8. The air-cooled heat pump coupled gas boiler heating system according to claim 1, characterized in that: The air-cooled heat pump adopts a four-pipe air-cooled heat pump capable of cooling and heating at the same time; the flue gas heat exchanger adopts a water-cooled flue gas heat exchanger.

9. The air-cooled heat pump coupled gas boiler heating system according to claim 1, characterized in that: The first valve to the fifth valve are electric valves.

10. The air-cooled heat pump coupled gas boiler heating system according to claim 1, characterized in that: The heating inlet of the air-cooled heat pump is connected to the air-conditioning water output end via a pipeline, and the heating circulation water pump and the first valve are sequentially arranged along the air-conditioning water flow path on the pipeline.

Images