Tail exhaust device

Abstract

The utility model provides a tail exhaust device which comprises a vertically arranged tail exhaust main pipe used for enabling tail gas of a fuel cell stack to flow upwards along the tail exhaust main pipe, and a water collecting area is arranged at the bottom of the tail exhaust main pipe; the drain valve is used for draining liquid water from the water collecting area; the guide pipe is used for guiding tail gas to flow into the tail exhaust main pipe, the guide pipe comprises a confluence section and a bent pipe section, the confluence section is transversely arranged, the bent pipe section extends into the tail exhaust main pipe from the confluence section, and the bent pipe section is used for guiding the tail gas which transversely flows into the tail exhaust main pipe to vertically flow upwards; wherein the confluence section is provided with an anode tail gas inlet, so that anode tail gas can flow into the confluence section through the anode tail gas inlet and is mixed with cathode tail gas in the confluence section.

Description

Technical Field

[0001] The utility model relates to the technical field of fuel cells, in particular to a tail exhaust device. Background Art

[0002] A fuel cell is a power generation device that converts the chemical energy of fuel (hydrogen) and oxidant (oxygen) into electrical energy through an electrochemical reaction. Since it is not limited by the "Carnot cycle", its energy conversion efficiency is significantly higher than that of ordinary heat engines. With the gradual maturity of fuel cell technology, fuel cell systems have been widely used in specific application fields such as vehicles, ships, drones, power stations and combined heat and power, and have broad development prospects.

[0003] Regardless of the application scenario, the exhaust gas of the fuel cell stack needs to be discharged, and the water generated by the electrochemical reaction is discharged from the fuel cell stack along with the exhaust gas. The exhaust gas of the fuel cell stack includes the cathode side exhaust gas and the anode side exhaust gas, wherein the cathode side exhaust gas mainly includes unreacted air and water vapor, and the anode side exhaust gas mainly includes hydrogen discharged by the Purge operation and nitrogen diffused to the anode side. The cathode side exhaust gas and the anode side exhaust gas are usually mixed and discharged to reduce the hydrogen concentration of the exhaust gas to avoid potential safety hazards. Since the exhaust gas carries liquid water and is discharged from the fuel cell stack together, it is usually necessary to separate the exhaust gas from the gas and the liquid water, and discharge the exhaust gas and the liquid water separately, and the liquid water can be further recycled and reused.

[0004] Therefore, the tail exhaust device needs to take into account safety, the smoothness of exhaust emissions, the ability to separate liquid water, the noise of exhaust emissions, and the manufacturing and installation costs, etc. Especially in application scenarios such as fuel cell test systems and fixed fuel cell power generation systems that do not have strict requirements on size and layout space, the design of the tail exhaust device has greater flexibility and freedom, and should take into account the above-mentioned indicators. Utility Model Content

[0005] The main advantage of the utility model is that it provides a tail exhaust device, wherein the tail exhaust device includes a vertically arranged tail exhaust main pipe, which is used to make the exhaust gas of the fuel cell stack flow upward along the tail exhaust main pipe to avoid the exhaust gas from being discharged from the lower position of the system, thereby not only preventing the exhaust gas with high humidity from having a negative impact on the system, but also preventing the high-temperature exhaust gas from scalding the staff.

[0006] Another advantage of the utility model is that it provides a tail exhaust device, wherein the tail exhaust device can mix the anode tail gas and the cathode tail gas of the fuel cell stack before discharging, thereby diluting the hydrogen in the anode tail gas and reducing the hydrogen concentration to below the explosion limit, avoiding potential safety hazards.

[0007] Another advantage of the present invention is that it provides a tail exhaust device, wherein the guide pipe of the tail exhaust device includes a curved pipe section for guiding the exhaust gas flowing in laterally to flow vertically upward, so as to avoid the exhaust gas directly colliding laterally with a local area of ​​the pipe wall of the tail exhaust main pipe when entering the tail exhaust main pipe, thereby reducing the friction between the exhaust gas and the pipe wall of the tail exhaust main pipe, and being able to eliminate noise to a certain extent.

[0008] Another advantage of the present invention is that it provides a tail exhaust device, wherein the guide pipe of the tail exhaust device includes a silencer section, so that the exhaust gas flows into the tail exhaust main pipe through the silencer section, thereby further eliminating noise.

[0009] Another advantage of the present invention is that it provides a tail discharge device, wherein the tail discharge device includes a guide pipe, one end of the guide pipe is connected to the tail discharge main pipe, and the other end of the guide pipe is connected to the drain port of the confluence section of the guide pipe, so that liquid water in the guide pipe can flow into the tail discharge main pipe through the guide pipe, thereby avoiding the accumulation of liquid water in the guide pipe to avoid affecting the flow of exhaust gas, which is beneficial to enhancing the smoothness of exhaust gas emission.

[0010] Another advantage of the present invention is that it provides a tail discharge device, wherein the anode tail gas inlet of the confluence section and the drain outlet of the confluence section are staggered with each other to avoid the anode tail gas inlet facing the drain outlet, thereby preventing the hydrogen in the anode tail gas from directly flowing into the guide pipe in large quantities without being effectively diluted, thereby reducing the risk of hydrogen leakage in the guide pipe.

[0011] Another advantage of the present invention is that it provides a tail exhaust device, wherein the tail exhaust device also includes a condensing coil, and the coil body of the condensing coil is arranged in the tail exhaust main pipe, which is used to further condense the tail gas to reduce the humidity of the tail gas and enhance the recovery efficiency of liquid water.

[0012] Another advantage of the present invention is that it provides a tail exhaust device, wherein the tail exhaust main pipe has a segmented structure to facilitate the manufacture and installation of the tail exhaust device and reduce the manufacture and installation costs of the tail exhaust device.

[0013] Another advantage of the present invention is that it provides a tail exhaust device, wherein the tail exhaust device can take into account various indicators such as safety, smoothness of tail gas emissions, liquid water separation ability, noise of tail gas emissions, and manufacturing and installation costs.

[0014] Accordingly, according to an embodiment of the present invention, a tail exhaust device having at least one of the aforementioned advantages includes:

[0015] A vertically arranged tail exhaust main pipe is used to allow the tail gas of the fuel cell stack to flow upward along the tail exhaust main pipe, wherein a water collection area is provided at the bottom of the tail exhaust main pipe;

[0016] a drain valve for draining liquid water from the water collection area; and

[0017] A guide pipe is used to guide the exhaust gas to flow into the tail exhaust main pipe, wherein the guide pipe includes a confluence section and a bend section, the confluence section is arranged horizontally, the bend section extends from the confluence section into the tail exhaust main pipe, and the bend section is used to guide the exhaust gas flowing in horizontally to flow vertically upward, wherein the confluence section is provided with an anode exhaust gas inlet, so that the anode exhaust gas can flow into the confluence section through the anode exhaust gas inlet and mix with the cathode exhaust gas in the confluence section.

[0018] In some embodiments, the tail drain device further comprises a guide pipe, wherein one end of the guide pipe is connected to the tail drain main pipe, and the other end of the guide pipe is connected to the drain outlet of the confluence section.

[0019] In some embodiments, the anode tail gas inlet of the confluence section and the drain outlet of the confluence section are staggered with each other.

[0020] In some embodiments, the guide pipe further includes a silencer section, wherein the silencer section is located in the tail exhaust main pipe, there is a gap between the silencer section and the pipe wall of the tail exhaust main pipe, and the silencer section is provided with a plurality of silencer holes.

[0021] In some embodiments, the silencer section includes a top plate and a tube body, wherein the tube body extends vertically, the top end of the tube body is connected to the top plate, the bottom end of the tube body is connected to the bend section, and the top plate and the tube body are both provided with silencer holes, wherein the sum of the cross-sectional areas of all the silencer holes is greater than the cross-sectional area of ​​the tube body, greater than the cross-sectional area of ​​the bend section, and greater than the cross-sectional area of ​​the confluence section.

[0022] In some embodiments, the tail pipe includes a first flange structure, wherein the height of the first flange structure is within the height range of the elbow section, and the height of the first flange structure is higher than the height of the confluence section.

[0023] In some embodiments, the tail exhaust device also includes a condensing coil, and the condensing coil includes a coil body, an inlet joint and an outlet joint, wherein the inlet joint and the outlet joint are respectively located at two ends of the coil body, the inlet joint and the outlet joint are both arranged on the pipe wall of the tail exhaust main pipe, and the coil body is arranged in the tail exhaust main pipe.

[0024] In some embodiments, the tail exhaust device also includes a condensing coil, which includes a coil body, an inlet joint and an outlet joint, wherein the inlet joint and the outlet joint are respectively located at two ends of the coil body, the inlet joint and the outlet joint are both arranged on the pipe wall of the tail exhaust main pipe, and the coil body is arranged in the tail exhaust main pipe, wherein at least a portion of the coil body surrounds the muffler section and is located in the gap between the muffler section and the pipe wall of the tail exhaust main pipe.

[0025] In some embodiments, the tail exhaust device further includes a fixing member, wherein the fixing member is disposed in the tail exhaust main pipe, and a welding connection structure is formed between the fixing member and the coil body.

[0026] In some embodiments, the tail exhaust main pipe includes a first flange structure and a second flange structure, wherein the setting height of the first flange structure is within the height range of the bend section, the setting height of the first flange structure is higher than the height of the confluence section, the setting height of the first flange structure is lower than the height of the coil body, and the setting height of the second flange structure is higher than the height of the coil body.

[0027] The above and other advantages of the present invention will be fully reflected in combination with the following description and the accompanying drawings.

[0028] The above and other advantages and features of the present invention are fully reflected in the following detailed description of the present invention and the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the tail exhaust device in an application scenario according to an embodiment of the utility model.

[0030] Figure 2 It is another schematic diagram of the tail exhaust device in the application scenario according to the embodiment of the utility model.

[0031] Figure 3 It is a cross-sectional schematic diagram of a tail exhaust device according to an embodiment of the utility model.

[0032] Figure 4 It is a schematic diagram of the silencer section of the guide pipe of the tail exhaust device according to an embodiment of the utility model.

[0033] Figure 5 It is a schematic cross-sectional view of a tail exhaust device according to another embodiment of the utility model.

[0034] Figure 6 It is another schematic cross-sectional view of the tail exhaust device according to the above embodiment of the utility model.

[0035] In the figure: 1. tail discharge device; 11. tail discharge main pipe; 110. water collection area; 111. first flange structure; 112. second flange structure; 12. guide pipe; 1201. anode tail gas inlet; 1202. drain outlet; 121. confluence section; 122. elbow section; 123. silencer section; 1230. silencer hole; 1231. top plate; 1232. pipe body; 13. guide pipe; 14. drain valve; 15. liquid level sensor; 16. hydrogen concentration sensor; 17. condensing coil; 171. coil body; 172. inlet joint; 173. outlet joint; 18. fixing parts. DETAILED DESCRIPTION

[0036] The following description is provided to enable those skilled in the art to implement the present invention. Other obvious replacements, modifications and variations may occur to those skilled in the art. Therefore, the scope of protection of the present invention should not be limited to the exemplary embodiments described herein.

[0037] Those skilled in the art should understand that, unless otherwise specified herein, the terms "one" and "an" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element may be one, while in another embodiment, the number of the element may be multiple.

[0038] Those skilled in the art should understand that, unless otherwise specified herein, the directions or positions referred to by the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the directions or positions shown in the drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the devices or elements involved must have a specific direction or position. Therefore, the above terms should not be understood as limiting the present invention.

[0039] Refer to the attached drawings of this utility model specification Figures 1 to 4 , the tail exhaust device 1 according to the embodiment of the utility model is explained. The tail exhaust device 1 is suitable for use in fuel cell test systems, fixed fuel cell power generation systems (such as fuel cell power stations, fuel cell cogeneration systems, etc.), etc., for discharging the tail gas of fuel cell stacks, wherein the tail exhaust device 1 can be used according to Figure 1 Install it by the built-in installation method shown in the figure, or you can install it by Figure 2 Install it using the external installation method shown.

[0040] like Figures 1 to 4As shown, the tail exhaust device 1 includes a tail exhaust main pipe 11 and a guide pipe 12, wherein the tail exhaust main pipe 11 is vertically arranged to allow the exhaust gas of the fuel cell stack to flow upward along the tail exhaust main pipe 11, and the guide pipe 12 is used to guide the exhaust gas to flow into the tail exhaust main pipe 11. Since the exhaust gas flows upward along the tail exhaust main pipe 11, it can be directly discharged to the outside through the tail exhaust main pipe 11, and the exhaust gas is discharged to the top of the tail exhaust main pipe 11, or it can be discharged to the outside through another discharge pipeline connected to the upper end of the tail exhaust main pipe 11, and the exhaust gas is discharged outside the factory building, thereby avoiding the exhaust gas from being discharged from the lower position of the system, which can not only prevent the exhaust gas with high humidity from having a negative impact on the system, but also prevent the high temperature exhaust gas from scalding the staff.

[0041] like Figure 3 As shown, the guide pipe 12 includes a confluence section 121 and a bend section 122, wherein the confluence section 121 is arranged horizontally, and the bend section 122 extends from the confluence section 121 into the tail exhaust main pipe 11, and the bend section 122 is used to guide the exhaust gas flowing in horizontally to flow vertically upward. Under the guidance of the bend section 122, when the exhaust gas enters the tail exhaust main pipe 11, it no longer directly hits the local area of ​​the pipe wall of the tail exhaust main pipe 11 horizontally, thereby reducing the friction between the exhaust gas and the pipe wall of the tail exhaust main pipe 11, and can eliminate noise to a certain extent.

[0042] Further references Figure 3 The confluence section 121 of the guide pipe 12 is provided with an anode tail gas inlet 1201, which is used to pass the anode tail gas discharged from the fuel cell stack Purge operation into the confluence section 121, so that the anode tail gas is mixed with the cathode tail gas in the confluence section 121, and then the mixed tail gas is guided into the tail exhaust main pipe 11 through the guide pipe 12, and finally the mixed tail gas is discharged. Therefore, the hydrogen in the anode tail gas can be diluted, so that the hydrogen concentration is reduced to below the explosion limit, avoiding potential safety hazards. The tail exhaust device 1 may also include a hydrogen concentration sensor 16 arranged in the confluence section 121 of the guide pipe 12, which is used to monitor the hydrogen concentration of the mixed tail gas, so that when the hydrogen concentration is too high, the system can make subsequent alarm actions in time.

[0043] Those skilled in the art can understand that the humidity of the exhaust gas of the fuel cell stack is relatively high, and it can carry liquid water and be discharged together. In the process of the exhaust gas flowing upward along the tail exhaust main pipe 11, the liquid water can fall to the water collection area 110 at the bottom of the tail exhaust main pipe 11 under the action of gravity, and be temporarily collected in the water collection area 110. Moreover, in the process of the exhaust gas flowing upward, the tube wall of the tail exhaust main pipe 11 can play a certain role in condensation and gas-water separation, and the separated liquid water can flow down along the tube wall of the tail exhaust main pipe 11 to the water collection area 110 of the tail exhaust main pipe 11. The tail exhaust device 1 also includes a drain valve 14 for discharging liquid water from the water collection area 110. When the liquid water in the water collection area 110 reaches a certain amount, the drain valve 14 opens to discharge the liquid water from the water collection area 110. If the switching of the on / off state of the drain valve 14 needs to be controlled by an electrical signal (such as a solenoid valve), the tail drain device 1 should also include a liquid level sensor 15 for detecting the liquid level in the water collection area 110, so as to send a corresponding electrical signal according to the liquid level result detected by the liquid level sensor 15 to control the drain valve 14. If the drain valve 14 is a purely mechanical drain valve 14 and does not need to be controlled by an electrical signal, the tail drain device 1 may not be provided with the liquid level sensor 15, wherein the drain valve 14 may be a float type drain valve, which controls the drain valve 14 to open in time through the buoyancy provided by liquid water, and the drain valve 14 may also be a pressure type drain valve, which controls the drain valve 14 to open in time through the pressure of liquid water.

[0044] like Figures 1 to 3 As shown, the tail discharge device 1 also includes a guide pipe 13, wherein one end of the guide pipe 13 is connected to the tail discharge main pipe 11, and the other end of the guide pipe 13 is connected to the drain port 1202 of the confluence section 121 of the guide pipe 12, so that the liquid water in the guide pipe 12 can flow into the tail discharge main pipe 11 through the guide pipe 13, and then flow to the water collection area 110 of the tail discharge main pipe 11, thereby avoiding the accumulation of liquid water in the guide pipe 12, so as not to affect the flow of exhaust gas, which is conducive to enhancing the smoothness of exhaust gas emission. Preferably, the guide pipe 13 always connects the confluence section 121 with the tail discharge main pipe 11, that is, the guide pipe 13 is a pipeline that always remains connected, without the need for state switching (no need to set a valve), which not only saves costs but also reduces the complexity of control. Furthermore, the anode tail gas inlet 1201 of the confluence section 121 and the drain outlet 1202 of the confluence section 121 are staggered with each other, that is, the anode tail gas inlet 1201 and the drain outlet 1202 are not directly opposite to each other, thereby preventing the hydrogen in the anode tail gas from directly flowing into the guide tube 13 in large quantities without being effectively diluted, thereby reducing the risk of hydrogen leakage in the guide tube 13.

[0045] like Figure 3 and Figure 4 As shown, the guide pipe 12 also includes a silencer section 123, wherein the silencer section 123 is located in the tail exhaust main pipe 11, and there is a gap between the silencer section 123 and the pipe wall of the tail exhaust main pipe 11, and the silencer section 123 is provided with a plurality of silencer holes 1230, so that the exhaust gas enters the tail exhaust main pipe 11 through the silencer holes 1230 with smaller apertures, which is equivalent to flowing into a larger chamber through a small hole, thereby the silencer section 123 and the tail exhaust main pipe 11 together form a silencer structure to eliminate noise. There is no need to set a traditional silencer at the upper end of the tail exhaust main pipe 11 (the traditional silencer has a complex structure and a high cost), thereby reducing the manufacturing cost of the tail exhaust device 1. Specifically, as Figure 4 As shown, the muffler section 123 includes a top plate 1231 and a tube body 1232, wherein the tube body 1232 extends vertically, the top end of the tube body 1232 is connected to the top plate 1231, the bottom end of the tube body 1232 is connected to the curved tube section 122, and the top plate 1231 and the tube body 1232 are both provided with the muffler holes 1230. Preferably, the sum of the cross-sectional areas of all the muffler holes 1230 is greater than the cross-sectional area of ​​the tube body 1232, greater than the cross-sectional area of ​​the curved tube section 122, and greater than the cross-sectional area of ​​the converging section 121, so as to not only help to enhance the smoothness of the exhaust gas emission, but also help to enhance the muffler effect.

[0046] In order to reduce the difficulty of manufacturing and installing the tail exhaust device 1 and reduce the manufacturing and installation cost of the tail exhaust device 1, the tail exhaust main pipe 11 includes a first flange structure 111, and the tail exhaust main pipe 11 is segmented by the first flange structure 111, thereby forming a segmented structure. The setting height of the first flange structure 111 is located within the height range of the elbow section 122, and the setting height of the first flange structure 111 is higher than the height of the confluence section 121, so as to facilitate the installation of the guide pipe 12 on the tail exhaust main pipe 11.

[0047] Refer to the attached drawings of this utility model specification Figure 5 and Figure 6, a tail exhaust device 1 according to another embodiment of the utility model is explained. The tail exhaust device 1 also includes a condensing coil 17, and the condensing coil 17 includes a coil body 171, an inlet joint 172 and an outlet joint 173, wherein the inlet joint 172 and the outlet joint 173 are respectively located at the two ends of the coil body 171, and the inlet joint 172 and the outlet joint 173 are both arranged on the pipe wall of the tail exhaust main pipe 11, and the coil body 171 is arranged in the tail exhaust main pipe. The cooling medium can flow into the coil body 171 from the inlet joint 172, flow along the coil body 171, and then flow out of the coil body 171 through the outlet joint 173, so that the tail gas can be further condensed through the coil body 171, and the liquid water can be fully separated to reduce the humidity of the tail gas, and at the same time, the recovery efficiency of the liquid water can be enhanced.

[0048] Preferably, at least a portion of the coil body 171 surrounds the silencing section 123 and is located at the interval between the silencing section 123 and the pipe wall of the tail exhaust main pipe 11, which is not only conducive to improving the condensation effect, but also can further improve the silencing effect.

[0049] In order to prevent the coil body 171 from shaking or deforming under the impact of exhaust gas, the tail exhaust device 1 also includes a fixing member 18, wherein the fixing member 18 is arranged in the tail exhaust main pipe 11, and a welding connection structure is formed between the fixing member 18 and the coil body 171, so that the structural stability of the coil body 171 is improved by welding the coil body 171 to the fixing member 18.

[0050] Furthermore, in order to facilitate the installation of the condensing coil 17, reduce the difficulty of manufacturing and installing the tail exhaust device 1, and reduce the manufacturing and installation cost of the tail exhaust device 1, the tail exhaust main pipe 11 also includes a second flange structure 112, and the tail exhaust main pipe 11 is segmented by the first flange structure 111 and the second flange structure 112, thereby forming a segmented structure. The setting height of the first flange structure 111 is located within the height range of the bend section 122, the setting height of the first flange structure 111 is higher than the height of the confluence section 121, the setting height of the first flange structure 111 is lower than the height of the coil body 171, and the setting height of the second flange structure 112 is higher than the height of the coil body 171.

[0051] Those skilled in the art will appreciate that the above embodiments are merely examples, wherein features of different embodiments may be combined with each other to obtain implementation methods that are easily conceivable based on the contents disclosed in the present invention but are not explicitly indicated in the drawings.

[0052] Those skilled in the art should understand that the above description and the embodiments shown in the drawings are only for illustrative explanation of the present invention, rather than for limiting the present invention. All equivalent implementations, modifications and improvements within the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A tail discharge device, characterized in that: include: A vertically arranged tail exhaust main pipe is used to allow the tail gas of the fuel cell stack to flow upward along the tail exhaust main pipe, wherein a water collection area is provided at the bottom of the tail exhaust main pipe; a drain valve for draining liquid water from the water collection area; and A guide pipe is used to guide the exhaust gas to flow into the tail exhaust main pipe, wherein the guide pipe includes a confluence section and a bend section, the confluence section is arranged horizontally, the bend section extends from the confluence section into the tail exhaust main pipe, and the bend section is used to guide the exhaust gas flowing in horizontally to flow vertically upward, wherein the confluence section is provided with an anode exhaust gas inlet, so that the anode exhaust gas can flow into the confluence section through the anode exhaust gas inlet and mix with the cathode exhaust gas in the confluence section.

2. The tail exhaust device according to claim 1, characterized in that: It also includes a guide pipe, wherein one end of the guide pipe is connected to the tail drain main pipe, and the other end of the guide pipe is connected to the drain port of the confluence section.

3. The tail exhaust device according to claim 2, characterized in that: The anode tail gas inlet of the converging section and the drain outlet of the converging section are arranged in a staggered manner.

4. The tail discharge device according to any one of claims 1 to 3, characterized in that: The guide pipe further comprises a muffler section, wherein the muffler section is located in the tail exhaust main pipe, there is a gap between the muffler section and the pipe wall of the tail exhaust main pipe, and the muffler section is provided with a plurality of muffler holes.

5. The tail exhaust device according to claim 4, characterized in that: The silencer section includes a top plate and a tube body, wherein the tube body extends vertically, the top end of the tube body is connected to the top plate, the bottom end of the tube body is connected to the curved pipe section, and the top plate and the tube body are both provided with silencer holes, wherein the sum of the cross-sectional areas of all the silencer holes is greater than the cross-sectional area of ​​the tube body, greater than the cross-sectional area of ​​the curved pipe section, and greater than the cross-sectional area of ​​the confluence section.

6. The tail discharge device according to any one of claims 1 to 3, characterized in that: The tail pipe includes a first flange structure, wherein the arrangement height of the first flange structure is within the height range of the elbow section, and the arrangement height of the first flange structure is higher than the height of the confluence section.

7. The tail discharge device according to any one of claims 1 to 3, characterized in that: It also includes a condensing coil, which includes a coil body, an inlet joint and an outlet joint, wherein the inlet joint and the outlet joint are respectively located at two ends of the coil body, the inlet joint and the outlet joint are both arranged on the pipe wall of the tail exhaust main pipe, and the coil body is arranged in the tail exhaust main pipe.

8. The tail exhaust device according to claim 4, characterized in that: It also includes a condensing coil, which includes a coil body, an inlet joint and an outlet joint, wherein the inlet joint and the outlet joint are respectively located at two ends of the coil body, the inlet joint and the outlet joint are both arranged on the pipe wall of the tail exhaust pipe, and the coil body is arranged in the tail exhaust pipe, wherein at least a portion of the coil body surrounds the muffler section and is located in the interval between the muffler section and the pipe wall of the tail exhaust pipe.

9. The tail exhaust device according to claim 7, characterized in that: It also includes a fixing piece, wherein the fixing piece is arranged in the tail pipe, and a welding connection structure is formed between the fixing piece and the coil body.

10. The tail exhaust device according to claim 7, characterized in that: The tail exhaust main pipe includes a first flange structure and a second flange structure, wherein the setting height of the first flange structure is located within the height range of the bend section, the setting height of the first flange structure is higher than the height of the confluence section, the setting height of the first flange structure is lower than the height of the coil body, and the setting height of the second flange structure is higher than the height of the coil body.

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