A flue gas heat exchanger

Abstract

The present invention provides a flue gas heat exchanger for exchanging the heat of flue gas generated by a gas engine to a refrigerant, and has the following characteristics: a first shell, which is a closed shell, having a flue gas inlet and a flue gas outlet; a refrigerant heat exchange unit, comprising a refrigerant inlet, a heat exchange component and a refrigerant outlet, at least a portion of the heat exchange component is arranged in the first shell, and the heat exchange component comprises a refrigerant heat exchange channel and fins, wherein the flue gas enters the first shell from the flue gas inlet, flows through the outside of the refrigerant heat exchange channel and the fins, transfers the heat in the flue gas to the refrigerant in the refrigerant heat exchange channel, and then flows out from the flue gas outlet.

Description

Technical Field

[0001] The invention relates to a heat exchanger, in particular to a flue gas heat exchanger. Background Art

[0002] At present, with the continuous advancement of gas heat pump technology, gas heat pumps have been widely used in the field of refrigeration and heating. Most of the popular gas heat pump units on the market are small multi-split units and hot and cold water units developed by Japanese companies such as Yanmar and Sanyo. The gas engines of these gas heat pump units are usually directly exposed to the surrounding environment. During the operation of the unit, the flue gas generated by the gas engine is usually directly discharged, and the heat in the flue gas is not utilized. Therefore, the gas heat pump units in the prior art only have low operating efficiency. With the implementation of the sustainable development strategy, the continuous strengthening of energy-saving and environmental protection awareness, and the promotion of the policy of replacing coal with gas for heating in winter in the north, how to improve the operating efficiency of gas heat pump units has become an urgent problem to be solved. Summary of the invention

[0003] The present invention is made to solve the problem of utilizing the heat in the flue gas generated when the above-mentioned gas engine is working, and its purpose is to provide a flue gas heat exchanger.

[0004] The present invention provides a flue gas heat exchanger for exchanging the heat of flue gas generated by a gas engine to a refrigerant, and has the following characteristics: a first shell, which is a closed shell, having a flue gas inlet and a flue gas outlet; a refrigerant heat exchange unit, comprising a refrigerant inlet, a heat exchange component and a refrigerant outlet, at least a portion of the heat exchange component is arranged in the first shell, and the heat exchange component comprises a refrigerant heat exchange channel and fins, wherein the flue gas enters the first shell from the flue gas inlet, flows through the outside of the refrigerant heat exchange channel and the fins, transfers the heat in the flue gas to the refrigerant in the refrigerant heat exchange channel, and then flows out from the flue gas outlet.

[0005] The flue gas heat exchanger provided by the present invention may also have the following feature: wherein the heat exchange component is any one of a fin coil heat exchanger, a microchannel heat exchanger, and a plate-fin heat exchanger.

[0006] The flue gas heat exchanger provided by the present invention may also have the following features: wherein the heat exchange unit also includes a liquid separator and a bus, the refrigerant heat exchange channel is connected to the refrigerant inlet through the liquid separator, and the refrigerant heat exchange channel is connected to the refrigerant outlet through the bus.

[0007] The flue gas heat exchanger provided by the present invention may also have the following features: the flue gas inlet is arranged on the top of the first shell, and the flue gas outlet is arranged on the side wall of the first shell.

[0008] The flue gas heat exchanger provided by the present invention may also have the following feature: wherein the first shell is in the shape of a rectangular parallelepiped.

[0009] The flue gas heat exchanger provided by the present invention may also have the following characteristics: a part of the heat exchange component is arranged in the first shell to absorb heat from the flue gas, and another part of the heat exchange component is arranged outside the first shell to absorb heat from the surrounding air.

[0010] The flue gas heat exchanger provided by the present invention may also have the following characteristics: the material of the heat exchange component is at least one of stainless steel, copper and aluminum, and the material of the first shell is stainless steel or aluminum.

[0011] The flue gas heat exchanger provided by the present invention may also have such a feature, and further includes: a non-refrigerant heat exchange unit, which is arranged in the first shell and between the heat exchange component and the flue gas inlet, including at least one of a steam generator and a flue gas-water heat exchanger.

[0012] Functions and Effects of the Invention

[0013] According to the flue gas heat exchanger involved in the present invention, since it includes a first box body, a flue gas duct and a refrigerant heat exchange unit, the refrigerant heat exchange unit includes a heat exchange component, a part of the heat exchange component is arranged in the first shell, and the part of the heat exchange component can absorb heat from the flue gas flowing through the first shell, so the flue gas heat exchanger can utilize the heat in the flue gas generated by the gas engine. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 The structure of the flue gas heat exchanger in the embodiment of the present invention is shown in FIG. Figure 1 ;

[0015] Figure 2 The structure of the flue gas heat exchanger in the embodiment of the present invention is shown in FIG. Figure 2 ;

[0016] Figure 3 The structure of the flue gas heat exchanger in the embodiment of the present invention is shown in FIG. Figure 3 ;

[0017] Figure 4 The structure of the wastewater treatment tank in the embodiment of the present invention is shown in FIG. Figure 1 ;

[0018] Figure 5 The structure of the wastewater treatment tank in the embodiment of the present invention is shown in FIG. Figure 2 . DETAILED DESCRIPTION

[0019] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the following embodiments are combined with the accompanying drawings to specifically illustrate the flue gas heat exchanger of the present invention.

[0020] Figure 1 The structure of the flue gas heat exchanger in the embodiment of the present invention is shown in FIG. Figure 1 ; Figure 2 The structure of the flue gas heat exchanger in the embodiment of the present invention is shown in FIG. Figure 2 ; Figure 3 The structure of the flue gas heat exchanger in the embodiment of the present invention is shown in FIG. Figure 3 .

[0021] like Figure 1-3 As shown, the flue gas heat exchanger 100 is used to be arranged in a heat preservation box, and includes a first shell 10, a second shell 20, a fan 30, a refrigerant heat exchange unit 40 and a wastewater treatment box 50.

[0022] The first shell 10 is a closed rectangular parallelepiped shell having a smoke inlet 11, a smoke outlet 12 and a condensed water outlet (not shown in the figure).

[0023] The smoke inlet 11 is arranged at the top of the first housing 10, and is used to be connected and communicated with the smoke outlet of the gas engine 22. The smoke outlet 12 is arranged on the side wall of the first housing 10. The condensed water outlet is arranged at the bottom of the first housing 10. And, the condensed water outlet is lower than the smoke outlet 12.

[0024] The second shell 20 is a closed rectangular parallelepiped shell, which has the same width as the first shell 10, and the two are connected together. The first shell 10 and the second shell 20 are not connected, so the smoke in the first shell 10 cannot enter the second shell 20. The second shell 20 has a hot air inlet 21 and a hot air outlet (not shown in the figure). The hot air inlet 21 is arranged at the top of the second shell 20. The hot air outlet is arranged at the bottom of the second shell 20.

[0025] The fan 30 is disposed at the hot air inlet 21 and is used to blow the hot air in the heat preservation box 100 into the hot air inlet 21 .

[0026] The refrigerant heat exchange unit 40 is disposed on the first shell 10 and the second shell 20 , and has a refrigerant inlet 41 , a heat exchange assembly 42 , a refrigerant outlet 43 , a liquid separator 44 , a bus bar 45 and a connecting pipe 46 .

[0027] The heat exchange component 42 includes fins 421 and refrigerant heat exchange channels 422. The heat exchange component 42 is any one of a fin coil heat exchanger, a microchannel heat exchanger, and a plate-fin heat exchanger. In the present embodiment, the heat exchange component 42 is a fin coil heat exchanger, and the fins 421 are arranged on the refrigerant heat exchange channels 422. The heat exchange component 42 includes three parts (three sections), namely, the first section area 42a, the second section area 42b, and the third section area 42c. That is, the fins 421 and the refrigerant heat exchange channels 422 are also arranged according to these three sections. The first section area 42a is arranged outside the first shell 10, the second section area 42b is arranged inside the first shell 10, and the third section area 42c is arranged inside the second shell 20.

[0028] The refrigerant heat exchange channel 422 has a coil inlet 4221 and a coil outlet 4222. The coil inlet 4221 is the location where the refrigerant enters the refrigerant heat exchange channel 422, and is disposed outside the first shell 10. The coil outlet 4222 is the location where the refrigerant flows out of the refrigerant heat exchange channel 422, and is disposed outside the second shell 20. The coil inlet 4221 is located lower than the coil outlet 4222.

[0029] The liquid separator 44 is a vertically arranged inverted cone structure, having an upper plane 441, a lower plane 442, a first inlet 443 and a plurality of liquid separation outlets 444. The number of the liquid separation outlets 444 is equal to the number of the refrigerant heat exchange channels 422. The first inlet 443 is arranged on the lower plane 442 and is connected to the refrigerant inlet 41. The liquid separation outlet 444 is arranged on the upper plane 441, and the plurality of liquid separation outlets are evenly distributed along the circumferential direction of the upper plane 441. The liquid separation outlet 444 is connected to the coil inlet 4221 through a connecting pipe 46. The material of the connecting pipe 46 is the same as that of the refrigerant heat exchange channel 422. The number of the connecting pipes 46 is the same as that of the refrigerant heat exchange channel 422.

[0030] like Figure 2 , 3 As shown, each branch of the bus 45 is connected to each coil outlet 4222, and the main path of the bus 45 is connected to the refrigerant outlet 43. In this embodiment, the bus 45 is arranged in the second shell 20. The refrigerant outlet 43 is penetrated on the second shell 20.

[0031] The first section area 42a is used for directly exchanging heat with the hot air in the heat preservation box 100. The second section area 42b is used for heat exchange with smoke. The third section area 42c is used for heat exchange with the hot air in the second shell 20.

[0032] The refrigerant flow process is as follows: the refrigerant enters the liquid separator 44 from the refrigerant inlet 41 through the first inlet 443 for liquid separation, then flows out from the liquid separation outlet 444, enters the refrigerant heat exchange channel 422 through the connecting pipe 46 and the coil inlet 4221, and after heat exchange in the refrigerant heat exchange channel 422, flows from the coil outlet 4222 to the bus 45, and finally flows out from the refrigerant outlet 43.

[0033] The flow process of the flue gas in the first shell 10 is as follows: the flue gas enters the first shell 10 from the flue gas duct 40, flows through the refrigerant heat exchange channel 422 and the fins 80, transfers heat to the refrigerant, and then flows out from the flue gas outlet. In this process, condensed water is generated, and the nitrogen oxides in the flue gas are partially dissolved in the condensed water, which flows out through the condensed water outlet.

[0034] The hot air flows in the second shell 20 as follows: the hot air enters the second shell 20 from the hot air inlet 21, flows through the refrigerant heat exchange channel 422 and the fins 80, transfers heat to the refrigerant, and then flows out from the hot air outlet.

[0035] Figure 4 The structure of the wastewater treatment tank in the embodiment of the present invention is shown in FIG. Figure 1 ; Figure 5 The structure of the wastewater treatment tank in the embodiment of the present invention is shown in FIG. Figure 2 .

[0036] like Figure 4 , 5 As shown, the wastewater treatment tank 50 includes a treatment tank body 51 , a partition plate 52 , a sewage outlet 53 and a stop valve 54 .

[0037] The processing box body 51 is disposed below the first shell 10 and the second shell 20 , and includes a shell 511 , a maintenance port 512 , a closing cover 513 , a water inlet 514 , and a water outlet 515 .

[0038] The shell 511 is a rectangular shell with a hollow interior, and zeolite is contained in the shell 511 .

[0039] The maintenance port 512 is rectangular and is provided on the upper surface of the housing 511, and can be used by an operator to deliver zeolite into the housing 511. The closing cover 513 is rectangular and has a size suitable for the maintenance port 512, and can be inserted into the maintenance port 512 to close the maintenance port 512.

[0040] The water inlet 514 is a circular through hole opened on the upper surface of the shell 511, and is connected to the condensed water outlet of the first box body 30 through a waste water pipe (not shown in the figure). The condensed water (waste water) discharged from the waste water pipe enters the shell 511 through the water inlet 514 to react with the zeolite for neutralization. The water outlet 515 is provided on the upper part of the side wall of the shell 511, and is a pipe connected to the shell 511 for discharging waste water.

[0041] The partition plate 52 is a rectangular plate, which is vertically fixed in the shell 511, located between the water inlet 514 and the water outlet 515, and also located between the water inlet 514 and the maintenance port 512. The bottom of the partition plate 52 is higher than the bottom of the shell 511 and lower than the water outlet 515, and the bottom of the partition plate 52 and the bottom of the shell 511 form a channel for wastewater to flow. The setting of the channel can increase the contact time between the wastewater and the zeolite, so that the wastewater and the zeolite react more fully.

[0042] A square through hole (not shown in the figure) is opened on the upper part of the partition plate 52, and the cross-sectional area of ​​the square through hole is larger than the cross-sectional area of ​​the zeolite. When the operator replenishes the zeolite into the shell 511 from the maintenance port, if the zeolite cannot be delivered to the side of the partition plate 52 away from the maintenance port 512, the operator can replenish the zeolite to the side of the partition plate 52 away from the maintenance port 512 through the square through hole.

[0043] The drain port 53 is disposed at the lower part of the side wall of the housing 511 and is a pipe connected to the housing 511 for draining the water and zeolite in the housing 511. The stop valve 54 is installed on the drain port 53 and can control the on and off of the drain pipe 531.

[0044] When in use, the height of the zeolite is lower than the water outlet 515 .

[0045] The working process of the wastewater treatment box 50 is as follows: wastewater enters the shell 511 from the water inlet 514, reacts with the zeolite in the shell 511, flows from one side of the partition plate 52 to the other side through the channel formed by the bottom of the partition plate 52 and the bottom of the shell 511, and finally flows out from the water outlet 515.

[0046] Functions and Effects of the Embodiments

[0047] According to the flue gas heat exchanger involved in the present invention, since it includes a first box body, a flue gas duct and a refrigerant heat exchange unit, the refrigerant heat exchange unit includes a heat exchange component, a part of the heat exchange component is arranged in the first shell, and the part of the heat exchange component can absorb heat from the flue gas flowing through the first shell, so the flue gas heat exchanger can utilize the heat in the flue gas generated by the gas engine.

[0048] Furthermore, because the flue gas heat exchanger also includes a second shell and a fan, a part of the heat exchange component is arranged in the second shell, the heat preservation box can confine the heat emitted by the engine when it is working, and the fan can blow the hot air in the heat preservation box into the second shell, and the heat exchange component arranged in the second shell can absorb heat from the hot air flowing through the second shell; in addition, the rest of the heat exchange component is arranged outside the first shell and the second shell, and this part of the heat exchange component can absorb heat from the hot air around it, so the flue gas heat exchanger can efficiently utilize the heat radiated from the gas engine to the surrounding air. In addition, this use of hot air can also effectively avoid the occurrence of the problem of excessive temperature of the gas engine caused by untimely heat dissipation, ensuring the normal operation of the gas engine.

[0049] The above-mentioned embodiments are preferred examples of the present invention and are not intended to limit the protection scope of the present invention.

[0050] For example, in this embodiment, the flue gas heat exchanger only includes a refrigerant heat exchange unit. In actual application, in order to improve the utilization effect of the flue gas, the flue gas heat exchanger includes, in addition to the refrigerant heat exchange unit, a non-refrigerant heat exchange unit, which is arranged in the first shell and between the heat exchange component and the flue gas inlet, and is a steam generator or a flue gas-water heat exchanger or a combination of the two.

Claims

1. A flue gas heat exchanger, arranged in an insulated box, for exchanging heat from flue gas generated by a gas engine to a refrigerant, characterized in that: include: The first shell is a closed shell having a smoke inlet and a smoke outlet; A refrigerant heat exchange unit, comprising a refrigerant inlet, a heat exchange component and a refrigerant outlet, at least a portion of the heat exchange component is disposed in the first shell, and the heat exchange component comprises a refrigerant heat exchange channel and fins; The second shell is a closed shell, connected to the first shell but not in communication with the first shell, and has a hot air inlet and a hot air outlet; as well as A fan is arranged at the hot air inlet and is used to blow the hot air in the heat preservation box into the hot air inlet. The heat exchange assembly includes a first section area, a second section area and a third section area, the second section area is arranged in the first shell, the first section area is arranged outside the first shell, the first section area is used to directly exchange heat with the hot air in the thermal insulation box, and the third section area is arranged in the second shell. The flue gas enters the first shell from the flue gas inlet, flows through the outside of the refrigerant heat exchange channel and the fins in the second section, transfers the heat in the flue gas to the refrigerant in the refrigerant heat exchange channel, and then flows out from the flue gas outlet. Hot air enters the second shell from the hot air inlet, flows through the outside of the refrigerant heat exchange channel in the third section and the fins, transfers heat to the refrigerant, and then flows out from the hot air outlet.

2. The flue gas heat exchanger according to claim 1, characterized in that: in, The heat exchange component is any one of a fin coil heat exchanger, a microchannel heat exchanger, and a plate-fin heat exchanger.

3. The flue gas heat exchanger according to claim 1, characterized in that: in, The heat exchange unit further includes a liquid separator and a bus bar, the refrigerant heat exchange channel is connected to the refrigerant inlet through the liquid separator, and the refrigerant heat exchange channel is connected to the refrigerant outlet through the bus bar.

4. The flue gas heat exchanger according to claim 1, characterized in that: in, The smoke inlet is arranged on the top of the first shell, and the smoke outlet is arranged on the side wall of the first shell.

5. The flue gas heat exchanger according to claim 1, characterized in that: in, The first shell is in a rectangular parallelepiped shape.

6. The flue gas heat exchanger according to claim 1, characterized in that: in, The material of the heat exchange component is at least one of stainless steel, copper and aluminum, and the material of the first shell is stainless steel or aluminum.

7. The flue gas heat exchanger according to claim 1, characterized in that: Also includes: The non-refrigerant heat exchange unit is arranged in the first shell and between the heat exchange component and the flue gas inlet, and includes at least one of a steam generator and a flue gas-water heat exchanger.

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