Efficient energy-saving gas steam generator

Abstract

The utility model discloses an efficient energy-saving fuel gas steam generator, which belongs to the field of steam generators and comprises a support frame, a gas inlet system, a combustion system, a heat exchange system, a steam system and a smoke exhaust system, and the support frame is responsible for fixing and supporting the gas inlet system, the combustion system, the heat exchange system, the steam system and the smoke exhaust system. The air inlet system, the combustion system, the heat exchange system and the smoke exhaust system are sequentially connected front and back, the steam system is located above the heat exchange system, the air inlet system evenly feeds external air into the combustion system, the combustion system conducts gas combustion and generates high-temperature smoke, the heat exchange system absorbs smoke heat and quickly generates high-temperature steam, and the steam exhaust system is used for exhausting the high-temperature steam. The steam system conveys high-temperature steam to the outside, and the smoke exhaust system preheats fresh air through smoke waste heat and conveys the fresh air into the air inlet system. Flue gas waste heat is used for heating fresh air, the combustion effect is enhanced, the energy utilization rate is increased, and meanwhile flue gas pollutant emission can be greatly reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of gas steam generators, in particular to an energy-efficient gas steam generator. Background Art

[0002] A gas steam generator is a gas combustion device that uses the heat energy of gas to heat water into steam. The device generally includes components such as a housing, a burner, a heat exchanger, and a fan, and is mainly used in industrial production, food processing, workshop dust removal, room humidification, clothing steaming and washing, etc., and has a very wide range of applications.

[0003] The existing gas steam generators have the following technical problems: Most of the burners of gas steam generators are located below the heat exchanger. On the one hand, local high temperatures are likely to occur at the bottom of the heat exchanger during the operation of the device, and scale is likely to form at the bottom of the heat exchanger, which exacerbates the damage of the heat exchanger. Moreover, the water temperature above the inner part of the heat exchange tube is relatively low, resulting in a large amount of liquid water carried when the steam is discharged, and the steam conversion efficiency is low, which not only increases the operating cost of the device but also affects the use effect of the device. On the other hand, the combustion flue gas still has relatively high waste heat after exchanging heat with the heat exchanger. If not recovered, it will cause a large amount of energy loss, which is not conducive to energy conservation and environmental protection during the operation of the device. Summary of the Utility Model

[0004] In view of the above deficiencies of the prior art, the utility model provides an energy-efficient gas steam generator. The internal heat exchanger of this gas steam generator is not prone to scaling, and high-temperature steam can be quickly formed inside the heat exchanger, and the gas-liquid separation effect is obvious. The waste heat of the flue gas is recovered and utilized through a waste heat recovery device, which not only enhances the combustion effect and improves the energy utilization rate but also reduces the emission of flue gas pollutants.

[0005] To achieve the above objectives, the technical solution adopted by the utility model is:

[0006] An energy-efficient gas steam generator includes a support frame, an air intake system, a combustion system, a heat exchange system, and an exhaust system. The support frame is responsible for fixedly supporting the air intake system, the combustion system, the heat exchange system, the steam system, and the exhaust system. The air intake system, the combustion system, the heat exchange system, and the exhaust system are connected in sequence from front to back. The steam system is located above the heat exchange system and is connected to the heat exchange system.

[0007] Further, the air intake system consists of an air intake chamber, a triangular air intake cavity, and an air supply pipe. The air intake chamber is located in front of the support frame. The triangular air intake cavity is connected below the air intake chamber. The lower inlet of the triangular air intake cavity is connected to the air supply pipe.

[0008] Further, the combustion system consists of a combustion chamber, a fire viewing hole, a heat insulation plate, a burner, a gas nozzle, a nozzle base, a flow equalizing plate, a gas pipe, and a gas ratio valve. The combustion chamber is located behind the air inlet chamber and is hermetically connected to the air inlet chamber. Three fire viewing holes are installed on the outer wall of the combustion chamber, heat insulation plates are installed around the inner wall of the combustion chamber, and a burner is installed inside the combustion chamber. A flow equalizing plate with a porous structure is installed in front of the burner, a gas nozzle and a nozzle base are installed below the burner, the nozzle base is connected to the gas pipe, and a gas ratio valve is installed on the gas pipe.

[0009] Further, the heat exchange system consists of a heat exchange chamber, a heat exchanger, a water level probe, an extremely low water level protection probe, a liquid level gauge, a water inlet pipe, a drain pipe, a water inlet valve, and a drain valve. The heat exchange chamber is installed behind the combustion chamber and is hermetically connected to the combustion chamber. A heat exchanger is installed inside the heat exchange chamber. The heat exchanger is connected to the water inlet pipe, the drain pipe, and the attached water inlet valve and drain valve below. A water level probe is installed on one side above the heat exchanger, and an extremely low water level protection probe and a liquid level gauge are installed on the other side. The lower end of the liquid level gauge is connected to the drain outlet of the heat exchanger.

[0010] Further, the heat exchanger consists of high-temperature heat exchange tubes, low-temperature heat exchange tubes, an upper diversion chamber, a lower diversion chamber, a gas-liquid separation chamber, a water inlet, a drain outlet, through holes, and heat conducting fins. The high-temperature heat exchange tubes are composed of two rows of heat exchange tubes and are arranged perpendicular to the flue gas flow direction. The high-temperature heat exchange tubes are communicated with the gas-liquid separation chamber above. The inlets of the high-temperature heat exchange tubes are communicated with the lower diversion chamber below. The gas-liquid separation chamber is connected to the steam pipe above. One through hole is installed on each side of the gas-liquid separation chamber. The low-temperature heat exchange tubes are a row of heat exchange tubes and are installed behind the high-temperature heat exchange tubes in a staggered manner. Flow channels exist inside the upper and lower diversion chambers and connect the heads and tails of the low-temperature heat exchange tubes in sequence. The inlet of the low-temperature heat exchange tubes is directly connected to the water inlet, and the outlet of the low-temperature heat exchange tubes is communicated with the inlets of the high-temperature heat exchange tubes through the lower diversion chamber. A drain outlet is installed on one side of the lower diversion chamber. The heat conducting fins are installed on the outer walls of the high-temperature and low-temperature heat exchange tubes.

[0011] Further, the steam system consists of a steam pipe, a safety valve, a pressure sensor, a pressure switch, a pressure gauge, and a high-temperature ball valve. The inlet of the steam pipe is hermetically connected to the outlet of the heat exchanger, and a safety valve, a pressure sensor, a pressure switch, a pressure gauge, and a high-temperature ball valve are installed on the steam pipe.

[0012] Further, the smoke exhaust system consists of a smoke exhaust chamber, a waste heat recovery device, a fan, and a smoke exhaust pipe. A waste heat recovery device with a plate structure is arranged inside the smoke exhaust chamber. One end of the waste heat recovery device is an air inlet, and the other end is an air outlet. The air outlet is connected to the air inlet of the triangular air inlet chamber through an air supply pipe. The fan and the smoke exhaust pipe are installed at the outlet of the smoke exhaust chamber.

[0013] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0014] 1. The triangular air intake cavity in the air intake system is provided with ventilation holes on its upper surface that are consistent with the number of burner sheets, and the internal flow cross-sectional area of the triangular air intake cavity gradually decreases with the depth on both sides. This structure can make the air flow through each ventilation hole equal. During operation, the flow equalizing plate with a porous structure arranged in front of the burner can ensure that each burner surface obtains an equal air flow, while keeping the air flow direction stable.

[0015] 2. The heat exchange tubes in the heat exchange system are composed of high-temperature and low-temperature heat exchange tubes. The high-temperature heat exchange tubes are arranged perpendicular to the flue gas flow direction, increasing the heat exchange area and ensuring uniform heating of the tube walls. When water vapor flows upward into the steam pipeline, the liquid water carried in it will flow back to the high-temperature heat exchange tubes and be reheated due to its own gravity and the blockage of the cavity structure. In addition, the low-temperature heat exchange tubes are misaligned and installed behind the high-temperature heat exchange tubes. The low-temperature heat exchange tubes absorb part of the flue gas waste heat and preliminarily preheat the incoming cold water, increasing the initial water temperature in the high-temperature heat exchange tubes and accelerating the steam generation rate. Moreover, a large number of heat conduction fins are provided outside the high-temperature and low-temperature heat exchange tubes, further improving the heat exchange efficiency of each heat exchange tube.

[0016] 3. The waste heat recovery device in the exhaust system can transfer the flue gas waste heat to the incoming fresh air to increase the air temperature in the air intake chamber, strengthening the combustion effect and improving the energy utilization rate while reducing the emission of flue gas pollutants. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic diagram of the external structure of the present utility model.

[0018] Figure 2 is a top view structure diagram of the present utility model.

[0019] Figure 3 is Figure 2 a schematic cross-sectional structure diagram at A-A in

[0020] Figure 4 is a schematic diagram of the triangular air intake cavity structure of the present utility model.

[0021] Figure 5 is a schematic diagram of the heat exchanger structure of the present utility model (part of the heat conduction fins are not shown).

[0022] Figure 6 is a schematic diagram of the flow channel structure of the low-temperature heat exchange tube of the present utility model.

[0023] Labels in the figure: 1. Support frame; 2. Intake chamber; 3. Triangular intake cavity; 4. Air supply pipe; 5. Combustion chamber; 6. Fire viewing hole; 7. Heat insulation plate; 8. Burner; 9. Gas nozzle; 10. Nozzle base; 11. Flow equalizing plate; 12. Gas pipe; 13. Gas ratio valve; 14. Heat exchange chamber; 15. Heat exchanger; 16. Water level probe; 17. Extremely low water level protection probe; 18. Liquid level gauge; 19. Water inlet pipe; 20. Drain pipe; 21. Water inlet valve; 22. Drain valve; 23. High-temperature heat exchange pipe; 24. Low-temperature heat exchange pipe; 25. Upper diversion cavity; 26. Lower diversion cavity; 27. Gas-liquid separation cavity; 28. Water inlet; 29. Drain outlet; 30. Through hole; 31. Heat conducting fin; 32. Steam pipe; 33. Safety valve; 34. Pressure sensor; 35. Pressure switch; 36. Pressure gauge; 37. High-temperature ball valve; 38. Smoke exhaust chamber; 39. Waste heat recovery device; 40. Fan; 41. Smoke exhaust pipe. Specific embodiments

[0024] The following combines the attached Figures 1-6 The present utility model will be clearly and detailedly described. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present utility model.

[0025] As Figure 1 shown, a high-efficiency and energy-saving gas steam generator includes a support frame 1, an intake system, a combustion system, a heat exchange system, and a smoke exhaust system. The support frame 1 is responsible for fixedly supporting the intake system, the combustion system, the heat exchange system, the steam system, and the smoke exhaust system. The intake system, the combustion system, the heat exchange system, and the smoke exhaust system are connected in sequence from front to back. The steam system is located above the heat exchange system and is connected to the heat exchange system.

[0026] As Figures 1-4 shown, a high-efficiency and energy-saving gas steam generator, the intake system is composed of an intake chamber 2, a triangular intake cavity 3, and an air supply pipe 4. The intake chamber 2 is located in front of the support frame 1. The intake chamber 2 is connected to the triangular intake cavity 3 below. The lower inlet of the triangular intake cavity 3 is connected to the air supply pipe 4.

[0027] As Figures 1-3An efficient and energy-saving gas steam generator as shown, the combustion system is composed of a combustion chamber 5, a fire viewing hole 6, a heat insulation plate 7, a burner 8, a gas nozzle 9, a nozzle base 10, a flow equalizing plate 11, a gas pipe 12 and a gas ratio valve 13. The combustion chamber 5 is located behind the air inlet chamber 2 and is hermetically connected to the air inlet chamber 2. Three fire viewing holes 6 are installed on the outer wall of the combustion chamber 5. Heat insulation plates 7 are installed around the inner wall of the combustion chamber 5. And a burner 8 is installed inside the combustion chamber 5. A flow equalizing plate 11 with a porous structure is installed in front of the burner 8. The flow equalizing plate 11 can make each combustion surface of the burner 8 obtain an equal amount of air, and at the same time ensure that the air flow direction remains stable. A gas nozzle 9 and a nozzle base 10 are installed below the burner 8. The nozzle base 10 is connected to the gas pipe 12. A gas ratio valve 13 is installed on the gas pipe 12. The gas transported by the gas pipe 12 is ejected through the gas nozzle 9 and evenly distributed to each burner 8.

[0028] As Figures 1-3 An efficient and energy-saving gas steam generator as shown, the heat exchange system is composed of a heat exchange chamber 14, a heat exchanger 15, a water level probe 16, an extremely low water level protection probe 17, a liquid level gauge 18, a water inlet pipe 19, a drain pipe 20, a water inlet valve 21 and a drain valve 22. The heat exchange chamber 14 is installed behind the combustion chamber 5 and is hermetically connected to the combustion chamber 5. A heat exchanger 15 is installed inside the heat exchange chamber 14. The heat exchanger 15 is connected to the water inlet pipe 19, the drain pipe 20 and the attached water inlet valve 21 and drain valve 22 below. A water level probe 16 is installed on one side above the heat exchanger 15. The water level probe 16 can ensure that the water level inside the heat exchanger 15 is maintained at a certain level. An extremely low water level protection probe 17 and a liquid level gauge 18 are installed on the other side above the heat exchanger 15. The lower end of the liquid level gauge 18 is connected to the drain port of the heat exchanger 15. The liquid level gauge 18 can facilitate personnel to directly observe the water level inside the heat exchanger 15 from the outside. When the extremely low water level protection probe 17 cannot detect the water level signal, the gas ratio valve 13 closes and stops supplying gas, further ensuring the safe operation of the heat exchanger 15.

[0029] As Figures 5-6An efficient and energy-saving gas steam generator as shown, wherein the heat exchanger 15 is composed of high-temperature heat exchange tubes 23, low-temperature heat exchange tubes 24, upper diversion chamber 25, lower diversion chamber 26, gas-liquid separation chamber 27, water inlet 28, drain outlet 29, through holes 30 and heat conduction fins 31. The high-temperature heat exchange tubes 23 are composed of two rows of heat exchange tubes and are arranged perpendicular to the flue gas flow direction. The high-temperature heat exchange tubes 23 are communicated with the upper gas-liquid separation chamber 27 above. The lower inlets of each tube of the high-temperature heat pipe 23 are communicated with the lower diversion chamber 26. The gas-liquid separation chamber 27 is connected to the upper steam pipeline 32. One through hole 30 is installed on each side of the gas-liquid separation chamber 27. The through holes 30 can be used for inserting a water level probe 16 and an extremely low water level protection probe 17. The low-temperature heat exchange tubes 24 are a row of heat exchange tubes and are installed behind the high-temperature heat exchange tubes 23 in a staggered manner. There are fluid channels inside the upper 25 and lower diversion chambers 26 to connect the heads and tails of each tube of the low-temperature heat exchange tubes 24 in sequence. The inlet of the low-temperature heat exchange tubes 24 is directly connected to the water inlet 28, and the outlet of the low-temperature heat exchange tubes 24 is communicated with the inlets of each tube of the high-temperature heat exchange tubes 23 through the lower diversion chamber 26. The low-temperature heat exchange tubes 24 are responsible for preheating the incoming cold water and sending it into the high-temperature heat exchange tubes 23, thereby accelerating the steam generation rate in the high-temperature heat exchange tubes 23. A drain outlet 29 is installed on one side of the lower diversion chamber 26. The drain outlet 29 can be used to remove the dirt in the heat exchange tubes. The heat conduction fins 31 are installed on the outer walls of the high 23 and low-temperature heat exchange tubes 24 to enhance the heat exchange effect.

[0030] As Figure 1 An efficient and energy-saving gas steam generator as shown, wherein the steam system is composed of a steam pipeline 32, a safety valve 33, a pressure sensor 34, a pressure switch 35, a pressure gauge 36 and a high-temperature ball valve 37. The inlet of the steam pipeline 32 is hermetically connected to the outlet of the heat exchanger 15. A safety valve 33, a pressure sensor 34, a pressure switch 35, a pressure gauge 36 and a high-temperature ball valve 37 are installed on the steam pipeline 32. The safety valve 33 is a pneumatic mechanical device that can perform emergency pressure relief when the steam pressure is too high. The pressure switch 35 is an electronic sensor. When it detects that the steam pressure inside the steam pipeline 32 is too high, the gas proportional valve 13 will close, thereby stopping the gas supply.

[0031] As Figures 1-3 An efficient and energy-saving gas steam generator as shown, wherein the smoke exhaust system is composed of a smoke exhaust chamber 38, a waste heat recovery device 39, a fan 40 and a smoke exhaust pipe 41. A waste heat recovery device 39 with a plate structure is provided inside the smoke exhaust chamber 38. One end of the waste heat recovery device 39 is an air inlet, and the other end is an air outlet. The air outlet is connected to the air inlet of the triangular air inlet chamber 3 through an air supply pipe 4. The fan 40 and the smoke exhaust pipe 41 are installed at the outlet of the smoke exhaust chamber 38. The fan 40 extracts the final flue gas after the flue gas-air heat exchange from the smoke exhaust chamber 38.

[0032] A specific application of this embodiment is:

[0033] During use, external cold water enters the low-temperature heat exchange tube 24, the upper diversion chamber 25, the lower diversion chamber 26 and the high-temperature heat exchange tube 23 in sequence through the water inlet pipe 19. At the same time, under the suction of the fan 40, external fresh air enters the waste heat recovery device 39 and passes through the air supply pipe 4 and the triangular air inlet chamber 3 to enter the air inlet chamber 2. Subsequently, the air enters the combustion chamber 5 after being evenly distributed by the flow equalizing plate 11. External gas enters the gas base 10 through the gas pipe 12 and is ejected by the gas nozzle 9. After the surface of the burner 8 is ignited, flames and high-temperature flue gas are generated. Under the action of the rear fan 40, the flames and high-temperature flue gas heat the water in the high-temperature heat exchange tube 23 and the low-temperature heat exchange tube 24 in sequence. The high-temperature heat exchange tube 23 absorbs most of the heat of the flue gas and quickly generates steam in the tube. The low-temperature heat exchange tube 24 is responsible for absorbing part of the waste heat of the flue gas and heating the incoming cold water. After the preheated water enters the high-temperature heat exchange tube 23, the steam generation rate can be accelerated. When the high-temperature steam enters the gas-liquid separation chamber 27, the liquid water entrained therein can flow back to the high-temperature heat exchange tube 23 to be reheated. When the high-temperature steam passes through the steam pipe 32, the pressure sensor 34 and the pressure gauge 36 provided on the steam pipe 32 can feedback the steam pressure in real time. The safety valve 33 and the pressure switch 35 can ensure that the equipment works under a safe pressure. After the heat exchange, the flue gas enters the smoke exhaust chamber 38, and the plate-type waste heat recovery device 39 provided inside transfers the waste heat of the flue gas to the incoming fresh air. The preheated air enters the combustion chamber 5 through the air inlet system to continue to participate in combustion, and then the fan 40 discharges the flue gas after the waste heat recovery. Contents not described in detail in this description, such as the water inlet valve 21, the gas proportional valve 13, the heat insulation plate 7, etc., all belong to the prior art well-known to those skilled in the art.

[0034] The above embodiments are used to explain the principle and implementation mode of the present invention, rather than to limit the present invention. It should be noted that due to the limitations of the example description, and objectively, the specific structure of the present invention has an infinite number of forms. For those of ordinary skill in the art in this technical field, any modification, polishing or combination made to the present invention without departing from the principle of the present invention belongs to the protection scope of the present invention.

Claims

1. A high-efficiency and energy-saving gas steam generator, comprising a support frame, an air intake system, a combustion system, a heat exchange system and a smoke exhaust system, characterized in that: The support frame is responsible for fixing and supporting the air intake system, combustion system, heat exchange system, steam system and smoke exhaust system. The air intake system, combustion system, heat exchange system and smoke exhaust system are connected front and back in sequence. The steam system is located above the heat exchange system and is connected to the heat exchange system. The heat exchange system consists of a heat exchange chamber, a heat exchanger, a water level probe, an extremely low water level protection probe, a liquid level gauge, a water inlet pipe, a drain pipe, a water inlet valve and a drain valve. A heat exchanger is installed inside the heat exchange chamber. The water inlet pipe, the drain pipe and the water inlet valve and the drain valve are connected below the heat exchanger. The heat exchanger is arranged perpendicular to the direction of smoke flow and has heat-conducting fins on the outer wall. The upper end of the heat exchanger is connected to the gas-liquid separation chamber.

2. A high-efficiency and energy-saving gas steam generator according to claim 1, characterized in that: The air intake system consists of an air intake chamber, a triangular air intake cavity and an air supply pipe. The air intake chamber is located in front of the support frame, the triangular air intake cavity is connected below the air intake chamber, and the inlet below the triangular air intake cavity is connected to the air supply pipe.

3. The high-efficiency and energy-saving gas steam generator according to claim 1, characterized in that: The combustion system consists of a combustion chamber, a fire viewing hole, a heat insulation plate, a burner, a gas nozzle, a nozzle base, a flow equalizing plate, a gas pipe and a gas proportional valve. The combustion chamber is located behind the air intake chamber and is sealed and connected to the air intake chamber. Three fire viewing holes are installed on the outer wall of the combustion chamber, heat insulation plates are installed around the inner wall of the combustion chamber, and a burner is installed inside the combustion chamber. A flow equalizing plate with a porous structure is installed in front of the burner, and a gas nozzle and a nozzle base are installed below the burner. The nozzle base is connected to the gas pipe, and a gas proportional valve is installed on the gas pipe.

4. The high-efficiency and energy-saving gas steam generator according to claim 1, characterized in that: The heat exchange system consists of a heat exchange chamber, a heat exchanger, a water level probe, an extremely low water level protection probe, a liquid level gauge, a water inlet pipe, a drain pipe, a water inlet valve and a drain valve. The heat exchange chamber is installed behind the combustion chamber and is sealed with the combustion chamber. A heat exchanger is installed inside the heat exchange chamber. The water inlet pipe, the drain pipe and the attached water inlet valve and the drain valve are connected below the heat exchanger. A water level probe is installed on one side above the heat exchanger, and an extremely low water level protection probe and a liquid level gauge are installed on the other side. The lower end of the liquid level gauge is connected to the drain port of the heat exchanger.

5. The high-efficiency and energy-saving gas steam generator according to claim 1, characterized in that: The heat exchanger is composed of a high-temperature heat exchange tube, a low-temperature heat exchange tube, an upper guide cavity, a lower guide cavity, a gas-liquid separation cavity, a water inlet, a drain outlet, a through hole and a heat-conducting fin. The high-temperature heat exchange tube is composed of two rows of heat exchange tubes and is arranged perpendicular to the flow direction of the flue gas. The high-temperature heat exchange tube is connected to the upper gas-liquid separation cavity, and the lower inlet of each tube of the high-temperature heat pipe is connected to the lower guide cavity. The gas-liquid separation cavity is connected to the upper steam pipeline, and a through hole is installed on each side of the gas-liquid separation cavity. The low-temperature heat exchange tube is a row of heat exchange tubes, which are staggered and installed behind the high-temperature heat exchange tube. There are flow channels inside the upper and lower guide cavities and connect the end to end of each tube of the low-temperature heat exchange tube in sequence. The inlet of the low-temperature heat exchange tube is directly connected to the water inlet, and the outlet of the low-temperature heat exchange tube is connected to the inlet of each tube of the high-temperature heat exchange tube through the lower guide cavity. A drain outlet is installed on one side of the lower guide cavity, and the heat-conducting fin is installed on the outer wall of the high and low-temperature heat exchange tubes.

6. The high-efficiency and energy-saving gas steam generator according to claim 1, characterized in that: The steam system consists of a steam pipeline, a safety valve, a pressure sensor, a pressure switch, a pressure gauge and a high-temperature ball valve. The steam pipeline inlet is sealed and connected to the heat exchanger outlet. The steam pipeline is equipped with a safety valve, a pressure sensor, a pressure switch, a pressure gauge and a high-temperature ball valve.

7. The high-efficiency and energy-saving gas steam generator according to claim 1, characterized in that: The smoke exhaust system consists of a smoke exhaust chamber, a waste heat recovery device, a fan and a smoke exhaust pipe. A plate-type waste heat recovery device is provided inside the smoke exhaust chamber. One end of the waste heat recovery device is an air inlet, and the other end is an air outlet. The air outlet is connected to the air inlet of the triangular air inlet cavity through an air supply pipe. The fan and the smoke exhaust pipe are installed at the outlet of the smoke exhaust chamber.

Images