Flue gas source heat recovery evaporator

Abstract

The utility model relates to a flue gas source heat recovery evaporator. According to the technical scheme, two sets of evaporators arranged side by side are evenly distributed in an inner cavity of an evaporator shell, each set of evaporator comprises a plurality of heat exchange pipes, fins are evenly distributed on the outer wall of each heat exchange pipe, the heat exchange pipes of the two sets of evaporators are distributed at intervals, the outlet end of one set of evaporator is connected with a first liquid separator through an air return pipe, and the outlet end of the other set of evaporator is connected with a second liquid separator. The outlet end of the other evaporator is connected with the second liquid separator through an air return pipe, the inlet ends of the two evaporators are connected with the electronic expansion valve through a main air inlet pipe, and the first liquid separator and the second liquid separator are connected to the first compressor and the second compressor through pipelines respectively. The air conditioner has the advantages that due to the fact that the heat exchange pipes of the two sets of evaporators are distributed in the evaporator shell at intervals, adjustment of parameters of the two sets of evaporators can be achieved by controlling the two compressors, and in some scenes, when the heat exchange efficiency needs to be accurately adjusted, the function of accurately and dynamically adjusting the parameters in a large range can be achieved.

Description

Technical Field

[0001] The utility model relates to a heat pump evaporator, in particular to a flue gas source heat recovery evaporator. Background Art

[0002] At present, a single evaporator is generally used in heat pump units. The evaporation pressure of a single evaporator decreases, the exhaust pressure increases, the compression ratio of the compressor increases, and the amount of frost on the evaporator increases, which leads to a decrease in the energy efficiency ratio of the heat pump unit and a decrease in the heating capacity. There is a contradiction between the increase in heat load demand of buildings under low-temperature conditions and the decrease in heating capacity of the air source heat pump unit. In addition, the range of dynamic adjustment parameters of a single evaporator is limited and cannot meet the needs of a large range of adjustments.

[0003] With the development of technology, dual air-cooled evaporators have emerged. The dual air-cooled evaporators can be used alternately, and can adjust the energy of the compressor to prevent the evaporation pressure from decreasing and affecting the performance of the heat pump unit. However, the existing dual air-cooled evaporators are generally connected in series, so there will be differences in ambient temperature, making parameter control more difficult. In some scenarios, when the heat exchange efficiency needs to be accurately and dynamically adjusted, the accurate dynamic adjustment function cannot be achieved. Utility Model Content

[0004] The purpose of the utility model is to provide a flue gas source heat recovery evaporator in view of the above-mentioned defects in the prior art. By designing two evaporators arranged in parallel, the two groups of evaporators can be connected in parallel with the same ambient temperature. The function of dynamically adjusting the heat exchange can be achieved by controlling the two groups of evaporators, thereby meeting the needs of a wide range of dynamic adjustment parameters.

[0005] The utility model discloses a flue gas source heat recovery evaporator, the technical scheme of which is as follows: comprising a heat exchange tube (2), a tube sheet (3), a support frame (4), a first liquid distributor (5), an air return pipe (6), an evaporator shell (7), a second liquid distributor (8) and a main air inlet pipe (13), the left and right ends of the evaporator shell (7) are respectively installed with the tube sheet (3), the upper and lower ends are respectively installed with the support frame (4), two groups of evaporators arranged in parallel are evenly distributed in the inner cavity of the evaporator shell (7), each group of evaporators comprises a plurality of heat exchange tubes (2), and the ends of the heat exchange tubes (2) are respectively installed with the tube sheets (3). The heat exchange tubes (2) of the two groups of evaporators are respectively installed on the tube sheet (3), fins (1) are evenly distributed on the outer wall of each heat exchange tube (2), and the heat exchange tubes (2) of the two groups of evaporators are arranged at intervals, the outlet end of one group of evaporators is connected to the first liquid distributor (5) through the return air pipe (6), the outlet end of the other group of evaporators is connected to the second liquid distributor (8) through the return air pipe (6), the inlet ends of the two groups of evaporators are connected to the electronic expansion valve (14) through the main air inlet pipe (13), and the first liquid distributor (5) and the second liquid distributor (8) are respectively connected to the first compressor (15) and the second compressor (16) through pipelines.

[0006] Preferably, the plurality of heat exchange tubes (2) are connected at the outer ends of the tube sheet (3) via a heat exchange joint (2.1).

[0007] Preferably, the output end of the main air inlet pipe (13) is connected to a plurality of branch pipes (13.1), and connected to the inlet end of the heat exchange pipe (2) through the branch pipes (13.1).

[0008] Preferably, a smoke inlet hood (9) is installed at the upper end of the evaporator shell (7), and the top of the smoke inlet hood (9) is connected to the smoke source via a smoke inlet pipe (10); and a smoke outlet hood (11) is installed at the lower end of the evaporator shell (7), and the lower end of the smoke outlet hood (11) is connected to the smoke exhaust channel via a smoke outlet pipe (12).

[0009] Preferably, the smoke inlet hood (9) is of a structure that is narrow at the top and wide at the bottom, and after the hot smoke passes through the two groups of evaporators arranged in parallel in the inner cavity of the evaporator shell (7), it is discharged along the smoke outlet hood (11) that is wide at the top and narrow at the bottom.

[0010] Preferably, a first filter is installed on the pipeline between the first liquid distributor (5) and the first compressor (15), and a second filter is installed on the pipeline between the second liquid distributor (8) and the second compressor (16).

[0011] The beneficial effect of the utility model is as follows: after the liquid refrigerant is throttled and reduced in pressure by the electronic expansion valve, it enters into the multiple heat exchange tubes through multiple branch pipes, the reduced-pressure refrigerant vaporizes and absorbs heat, and then returns to the first liquid distributor and the second liquid distributor through the return pipe, and then is respectively sent to the first compressor and the second compressor, and then is pressurized by the compressor, the refrigerant becomes a high-temperature and high-pressure gas, and then enters the condenser to heat the condensed water, and the gaseous refrigerant becomes a liquid, and then is throttled and reduced in pressure by the electronic expansion valve to continue the cycle; and the ambient temperature of the heat exchange tubes of the two groups of evaporators is the same, so that the parameters of the two groups of evaporators can be adjusted by controlling the two compressors, especially when the heat exchange efficiency needs to be accurately adjusted dynamically, the need for accurate dynamic adjustment over a wide range can be met, and the problem of difficulty in accurately adjusting the parameters will not be caused due to the different ambient temperatures of the heat exchange tubes of the two groups of evaporators. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Attached Figure 1 It is a schematic diagram of the structure of the utility model in a top view;

[0013] Attached Figure 2 It is a structural schematic diagram of the utility model in the front view direction;

[0014] Attached Figure 3 It is a schematic diagram of the tube sheet of the utility model in the right-side viewing direction;

[0015] Attached Figure 4It is a schematic diagram of the structure of the utility model when in use;

[0016] In the above figure: fin 1, heat exchange tube 2, tube sheet 3, support frame 4, first liquid distributor 5, return air pipe 6, evaporator shell 7, second liquid distributor 8, smoke inlet hood 9, smoke inlet pipe 10, smoke outlet hood 11, smoke outlet pipe 12, air inlet pipe 13, electronic expansion valve 14, first compressor 15 and second compressor 16, heat exchange joint 2.1, branch pipe 13.1. DETAILED DESCRIPTION

[0017] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0018] Example 1, reference Figure 1-Figure 4 The utility model mentions a flue gas source heat recovery evaporator, comprising fins 1, heat exchange tubes 2, tube sheets 3, support frames 4, a first liquid distributor 5, a return air pipe 6, an evaporator shell 7, a second liquid distributor 8 and a main air intake pipe 13. The left and right ends of the evaporator shell 7 are respectively installed with tube sheets 3, and the upper and lower ends are respectively installed with support frames 4. Two groups of evaporators arranged in parallel are evenly distributed in the inner cavity of the evaporator shell 7. Each group of evaporators includes a plurality of heat exchange tubes 2, and the ends of the heat exchange tubes 2 are respectively installed on the tube sheets 3. Fins 1 are evenly distributed on the outer wall of each heat exchange tube 2, and the heat exchange tubes 2 of the two groups of evaporators are distributed at intervals. The outlet end of one group of evaporators is connected to the first liquid distributor 5 through the return air pipe 6, and the outlet end of the other group of evaporators is connected to the second liquid distributor 8 through the return air pipe 6. The inlet ends of the two groups of evaporators are connected to the electronic expansion valve 14 through the main air intake pipe 13. The first liquid distributor 5 and the second liquid distributor 8 are respectively connected to the first compressor 15 and the second compressor 16 through pipelines.

[0019] Among them, multiple heat exchange tubes 2 are connected at the outer ends of the tube sheet 3 through heat exchange joints 2.1.

[0020] The output end of the main air inlet pipe 13 is connected to a plurality of branch pipes 13 . 1 , and is connected to the inlet end of the heat exchange pipe 2 through the branch pipes 13 . 1 .

[0021] A smoke inlet hood 9 is installed at the upper end of the evaporator shell 7, and the top of the smoke inlet hood 9 is connected to the smoke source through a smoke inlet pipe 10; a smoke outlet hood 11 is installed at the lower end of the evaporator shell 7, and the lower end of the smoke outlet hood 11 is connected to the smoke exhaust channel through a smoke outlet pipe 12.

[0022] The smoke inlet hood 9 is a structure that is narrow at the top and wide at the bottom. After the hot smoke passes through the two groups of evaporators arranged in parallel in the inner cavity of the evaporator housing 7, it is discharged along the smoke outlet hood 11 that is wide at the top and narrow at the bottom.

[0023] A first filter is installed on the pipeline between the first liquid distributor 5 and the first compressor 15 , and a second filter is installed on the pipeline between the second liquid distributor 8 and the second compressor 16 .

[0024] When the utility model is used, the liquid refrigerant passes through the electronic expansion valve 14 for throttling and reducing the pressure, and then passes through the multiple branch pipes 13.1 to enter the multiple heat exchange tubes 2. The reduced-pressure refrigerant gasifies and absorbs heat, and then passes through the return pipe 6 to return to the first liquid distributor 5 and the second liquid distributor 8, and then is respectively sent to the first compressor 15 and the second compressor 16. After being pressurized by the compressor, the refrigerant becomes a high-temperature and high-pressure gas, and then enters the condenser to heat the condensed water. The gaseous refrigerant becomes a liquid, and then passes through the electronic expansion valve 14 for throttling and reducing the pressure, and continues to circulate; thus, the parameters of the two groups of evaporators can be adjusted by controlling the two compressors. In some scenarios, when it is necessary to accurately and dynamically adjust the heat exchange efficiency, the function of accurate and large-range dynamic adjustment can be realized. For example, by turning off the first compressor 15, the first liquid distributor 5 and the first group of evaporators, another group of evaporators can be used alone to work to meet the needs of low power parameters. When full load operation is required, both groups of evaporators and both compressors work to meet the needs of full power parameters. The heat exchangers of the two groups of evaporators are arranged in parallel, so the ambient temperature is the same. When it is necessary to accurately and dynamically adjust the heat exchange efficiency, the need for accurate and dynamic adjustment over a wide range can be met.

[0025] Embodiment 2, a flue gas source heat recovery evaporator mentioned in the utility model comprises fins 1, heat exchange tubes 2, tube sheets 3, support frames 4, a first liquid distributor 5, a return air pipe 6, an evaporator shell 7, a second liquid distributor 8 and a main air intake pipe 13, the left and right ends of the evaporator shell 7 are respectively installed with tube sheets 3, and the upper and lower ends are respectively installed with support frames 4, two groups of evaporators arranged in parallel are evenly distributed in the inner cavity of the evaporator shell 7, each group of evaporators comprises a plurality of heat exchange tubes 2, and the ends of the heat exchange tubes 2 are respectively installed on the tube sheets 3, fins 1 are evenly distributed on the outer wall of each heat exchange tube 2, and the heat exchange tubes 2 of the two groups of evaporators are distributed at intervals, the outlet end of one group of evaporators is connected to the first liquid distributor 5 through the return air pipe 6, the outlet end of the other group of evaporators is connected to the second liquid distributor 8 through the return air pipe 6, the inlet ends of the two groups of evaporators are connected to the electronic expansion valve 14 through the main air intake pipe 13, the first liquid distributor 5 and the second liquid distributor 8 are respectively connected to the first compressor 15 and the second compressor 16 through pipelines.

[0026] The difference from Example 1 is:

[0027] According to the needs of on-site use, a third group of evaporators arranged in parallel can also be set up, and each group of evaporators includes multiple heat exchange tubes 2, so as to increase the range of dynamic adjustment and the adjustable capacity, thereby realizing a wider range of applications.

[0028] The above are only some preferred embodiments of the utility model. Any person skilled in the art may modify the above technical solutions or modify them into equivalent technical solutions. Therefore, any simple modification or equivalent replacement based on the technical solution of the utility model shall fall within the scope of protection claimed by the utility model.

Claims

1. A flue gas source heat recovery evaporator, characterized by: The invention comprises a heat exchange tube (2), a tube sheet (3), a support frame (4), a first liquid distributor (5), an air return pipe (6), an evaporator shell (7), a second liquid distributor (8) and a main air inlet pipe (13), wherein the tube sheets (3) are respectively installed at the left and right ends of the evaporator shell (7), and the support frames (4) are respectively installed at the upper and lower ends, and two groups of evaporators arranged in parallel are evenly distributed in the inner cavity of the evaporator shell (7), each group of evaporators comprises a plurality of heat exchange tubes (2), and the ends of the heat exchange tubes (2) are respectively installed on the tube sheets (3). Fins (1) are evenly distributed on the outer wall of each heat exchange tube (2), and the heat exchange tubes (2) of the two groups of evaporators are spaced apart. The outlet end of one group of evaporators is connected to the first liquid distributor (5) through a return air pipe (6), and the outlet end of the other group of evaporators is connected to the second liquid distributor (8) through the return air pipe (6). The inlet ends of the two groups of evaporators are connected to the electronic expansion valve (14) through a main air inlet pipe (13), and the first liquid distributor (5) and the second liquid distributor (8) are respectively connected to the first compressor (15) and the second compressor (16) through pipelines.

2. The flue gas source heat recovery evaporator according to claim 1 is characterized in that: The plurality of heat exchange tubes (2) are connected at the outer ends of the tube sheet (3) via heat exchange joints (2.1).

3. The flue gas source heat recovery evaporator according to claim 2 is characterized in that: The output end of the main air inlet pipe (13) is connected to a plurality of branch pipes (13.1), and is connected to the inlet end of the heat exchange pipe (2) through the branch pipes (13.1).

4. The flue gas source heat recovery evaporator according to claim 3 is characterized in that: A smoke inlet hood (9) is installed at the upper end of the evaporator shell (7), and the top of the smoke inlet hood (9) is connected to a smoke source via a smoke inlet pipe (10); a smoke outlet hood (11) is installed at the lower end of the evaporator shell (7), and the lower end of the smoke outlet hood (11) is connected to a smoke exhaust channel via a smoke outlet pipe (12).

5. The flue gas source heat recovery evaporator according to claim 4 is characterized in that: The smoke inlet hood (9) is of a structure that is narrow at the top and wide at the bottom. After the hot smoke passes through two groups of evaporators arranged in parallel in the inner cavity of the evaporator shell (7), it is discharged along the smoke outlet hood (11) that is wide at the top and narrow at the bottom.

6. The flue gas source heat recovery evaporator according to claim 5 is characterized in that: A first filter is installed on the pipeline between the first liquid distributor (5) and the first compressor (15), and a second filter is installed on the pipeline between the second liquid distributor (8) and the second compressor (16).

Images