Muffler with flue gas waste heat recovery function

Abstract

The present invention discloses a silencer with flue gas waste heat recovery function, which relates to the technical field of flue gas energy collection and silencer, and includes a pipe body, both ends of the pipe body are fixedly connected with docking plates, the circumferential outer wall of the pipe body is fixedly connected with a soundproof cover, the circumferential inner wall of the soundproof cover is respectively fixedly connected with a sealing cover and a mesh cover, the mesh cover is sleeved on the outside of the sealing cover, and the sealing cover, the mesh cover and the soundproof cover form a silencer chamber. In the present invention, cold water and high-temperature flue gas are only separated by the pipe body, so no other heat transfer consumption is generated, and the heat exchange flow channel is spiral, thereby effectively extending the heat exchange time between the heat exchange flow channel and the high-temperature flue gas, and the flue gas temperature here is at the highest state, so the pitch of the spiral blade gradually increases from the end away from the water inlet pipe, which can ensure that the density of the heat exchange flow channel here is greater than that of other areas, so that the cold water can fully exchange heat with the high-temperature flue gas.

Description

Technical Field

[0001] The invention relates to the technical field of flue gas energy recovery and silencer, and in particular to a silencer with a flue gas waste heat recovery function. Background Art

[0002] At present, the power industry, metallurgy, chemical industry and other industries are inseparable from steam power, and a large amount of flue gas is generated during the operation of the boiler. After being desulfurized and denitrated, the flue gas is discharged into the air, and a large amount of noise is generated during the discharge process. In order to ensure that there is no large amount of noise pollution during the flue gas discharge process, people will connect a muffler to the flue gas discharge pipe to reduce the noise generated during its discharge. However, during the flue gas discharge process, not only will a relatively strong noise be generated, but the flue gas will also take away a lot of heat. Directly discharging the flue gas into the air will cause a waste of heat and energy, and reduce the utilization rate of the combustion raw materials.

[0003] After searching, a Chinese patent with announcement number CN206770862U discloses a flue gas energy-collecting silencer, including a shell, characterized in that: cones are provided at both ends of the shell, the cone at the left end is connected to the flue gas inlet connecting pipe, a cooling water outlet interface is provided on the cone at the left end, a spray column type silencer is provided on the right side of the flue gas inlet connecting pipe; a smoke gas outlet connecting pipe is provided at the cone at the right end, and a cooling water inlet is provided on the cone at the right end; an inner silencer orifice plate is provided on the inner side of the shell, silencer cotton is provided between the inner silencer orifice plate and the inner wall of the shell, an internal circulating water heat exchange pipe is provided in the silencer cotton; a split silencer and a silencer device are provided in the shell.

[0004] Based on the existing technology, it is found that the above patent still has the following deficiencies: the heat exchange with the flue gas is realized by setting a circulating water heat exchange tube on the outer wall of the vertebral body. Although heat exchange can be carried out, the circulating water heat exchange tube has a certain wall thickness, and the outer wall of the circulating water heat exchange tube is also filled with silencer cotton, so the heat exchange efficiency between the circulating water heat exchange tube and the flue gas inside the vertebral body is relatively low, and the full utilization of heat energy cannot be achieved. At the same time, the above patent only performs silencing and noise reduction by setting a spray column type silencer and a split silencer inside the vertebral body, and the energy consumption of noise is low, resulting in poor silencing effect and cannot meet people's use needs. Therefore, a silencer with flue gas waste heat recovery function is urgently needed to solve the above problems. Summary of the invention

[0005] In view of the problems in the related art, the present invention proposes a muffler with a flue gas waste heat recovery function to overcome the above-mentioned technical problems existing in the existing related art.

[0006] The technical solution of the present invention is achieved in this way:

[0007] A silencer with flue gas waste heat recovery function comprises a pipe body, both ends of the pipe body are fixedly connected to docking plates, the circumferential outer wall of the pipe body is fixedly connected to a soundproof cover, the circumferential inner wall of the soundproof cover is respectively fixedly connected to a sealing cover and a mesh cover, the mesh cover is sleeved on the outside of the sealing cover, the sealing cover, the mesh cover and the soundproof cover form a silencer cavity, the interior of the silencer cavity is filled with sound insulation cotton, the circumferential outer wall of the pipe body is fixedly connected to a spiral blade, and the spiral blade is fixedly connected to the circumferential inner wall of the sealing cover;

[0008] The spiral blades, the circumferential outer wall of the tube body, and the circumferential inner wall of the sealing cover form a spiral heat exchange flow channel. The two ends of the sound insulation cover are respectively fixedly connected with a water inlet pipe and a drain pipe. The water inlet pipe and the drain pipe are both connected to the heat exchange flow channel. The pitch of the spiral blades gradually increases along the direction away from the end of the water inlet pipe.

[0009] A filter assembly for removing impurities from smoke is provided in the docking plate close to the water inlet pipe;

[0010] A first silencer component and a second silencer component are respectively arranged inside the tube body.

[0011] Further, the first silencer assembly includes a circular plate fixedly connected to the circumferential inner wall of the tube body, a first silencer is fixedly connected to the outer wall of one side of the circular plate, a first guide vane distributed in a circular pattern at equal distances is fixedly connected to the circumferential outer wall of the first silencer, a reflux hole distributed in a circular pattern at equal distances is opened on the circumferential outer wall of the first silencer, a second silencer is fixedly connected to the inner wall of one end of the first silencer, a second guide vane distributed in a circular pattern at equal distances is fixedly connected to the circumferential outer wall of the second silencer, both the first guide vane and the second guide vane are spiral-shaped, a fourth exhaust hole is opened on the circumferential outer wall of the second silencer, and a first exhaust hole is opened in the middle of the circular plate.

[0012] Furthermore, a first spoiler and a second spoiler that are equidistantly distributed in a circle are fixedly connected to an outer wall of one side of the circular plate close to the first silencer, and the cross-sections of the first spoiler and the second spoiler are both arc-shaped.

[0013] Furthermore, the second silencer assembly includes silencer ring plates connected to the circumferential inner wall of the tube body, the number of the silencer ring plates is three groups, the three groups of silencer ring plates are all trumpet-shaped, two groups of silencer ring plates are provided with third exhaust holes in the middle, and one group of silencer ring plates is provided with second exhaust holes equidistantly distributed in a circular shape in the middle.

[0014] Furthermore, the silencer ring plate provided with the second exhaust hole is located in the middle of the two groups of silencer ring plates provided with the third exhaust hole.

[0015] Furthermore, the curvature of the silencer ring plate gradually decreases in a direction away from the circular plate.

[0016] Furthermore, the circular plate and one side outer wall of the two groups of silencer ring plates are fixedly connected with a deflector, and the cross section of the deflector is arc-shaped.

[0017] Furthermore, the filter assembly includes a ring plate frame fixedly connected to the inside of a group of docking plates, a filter mesh plate is fixedly connected to the inside of the ring plate frame, one side outer wall of the filter mesh plate is flush with one side outer wall of the ring plate frame, and the other side outer wall of the filter mesh plate is provided with an arc groove, and the arc grooves are distributed at equal distances on the outer wall of the filter mesh plate.

[0018] Furthermore, one side of the ring plate frame is fixedly connected with arc rods distributed at equal distances, the arc rods are located in the middle of the two groups of arc grooves, and the outer wall of the arc rod close to the filter mesh plate is provided with tooth grooves distributed in an arc shape at equal distances.

[0019] Furthermore, a rotating column is rotatably connected to the middle part of the annular plate frame, and one end of the rotating column away from the annular plate frame is rotatably connected to the outer wall of one end of the first silencer, the circumferential outer wall of the rotating column is fixedly connected to a shaft sleeve, and the circumferential outer wall of the shaft sleeve is fixedly connected to fan blades distributed in a circle at equal distances, one end of the rotating column is fixedly connected to a fixed column, and the circumferential outer wall of the fixed column is fixedly connected to a connecting frame, and brush rollers are rotatably connected to both sides of the connecting frame.

[0020] Beneficial effects of the present invention:

[0021] The muffler with flue gas waste heat recovery function provided by the present invention has a filter component that is set up. After the high-temperature flue gas enters the interior of the docking plate, it will first contact the filter mesh plate. The filter mesh plate can not only filter and remove impurities of the high-temperature flue gas, but also prevent impurities carried by the high-temperature flue gas from entering the interior of the pipe body and settling to form a scale body, which affects the service life and muffler effect of the muffler. At the same time, the filter mesh plate with a porous structure can make the sound waves generated by the flow of flue gas reflect back and forth on the inner surface of the pores, thereby achieving a sound absorption effect. Subsequently, after the high-temperature flue gas flows out from the other side of the filter mesh plate, part of the flue gas will be discharged from the arc groove. The flue gas discharged from the arc groove will first hit its inner wall, thereby being able to consume a certain amount of the sound waves generated by the flow of flue gas. At the same time, another part of the flue gas will hit the tooth groove on the outer wall of one side of the arc rod, thereby being able to make the sound waves reflected and hit inside the tooth groove to be weakened to a certain extent, thereby being able to achieve preliminary muffler and noise reduction of the flue gas.

[0022] Then the smoke enters the inside of the tube body. The smoke entering the tube body will first come into contact with the fan blades. As the smoke continues to flow in, the smoke will push the fan blades to rotate. The rotation of the fan blades can consume the kinetic energy of the smoke flow, thereby reducing the noise of the smoke flow. In the process of rotation of the fan blades, the rotating column can be driven to rotate. In the process of rotation of the rotating column, the fixed column, connecting frame and brush roller at one end thereof can be driven to rotate together, thereby cleaning the surface of the filter mesh plate to avoid clogging of the filter mesh plate after long-term use.

[0023] The muffler with flue gas waste heat recovery function provided by the present invention has a first muffler component, and the high-temperature flue gas will collide with the end face of the first muffler after blowing the fan blades, thereby diffusing along the outer wall of the first muffler and flowing in the direction close to the circular plate. At this time, the high-temperature flue gas will fully contact the circumferential inner wall of the tube body. After the high-temperature flue gas fully contacts the inside of the tube body, it will fully exchange heat with the cold water inside the heat exchange flow channel. At the same time, the cold water and the high-temperature flue gas are only separated by the tube body, so no other heat transfer consumption is generated. At the same time, the heat exchange flow channel is spiral, which effectively prolongs the exchange time. The heat exchange time between the hot runner and the high-temperature flue gas is the highest here, so the pitch of the spiral blade gradually increases from the end away from the water inlet pipe, which can ensure that the density of the heat exchange flow channel here is greater than that of other areas, so that the cold water can fully exchange heat with the high-temperature flue gas. When the high-temperature flue gas flows in contact with the outer wall of one side of the circular plate, the first spoiler and the second spoiler arranged on the outer wall of the circular plate can form a vortex of the high-temperature flue gas, thereby prolonging the residence time of the high-temperature flue gas on one side of the circular plate, further improving the heat exchange efficiency between the high-temperature flue gas and the cold water.

[0024] Subsequently, the high-temperature flue gas flows back along the guidance of the first guide plate and flows into the interior of the first silencer through the reflux hole. The high-temperature flue gas flowing into the interior of the silencer will flow out from the fourth exhaust hole through the guidance of the second guide plate. In this process, the backflow of the flue gas is achieved, thereby extending the collision path of the flue gas with the first guide plate and the second guide plate, further weakening the sound waves generated when the flue gas flows, thereby achieving a good silencing effect.

[0025] The muffler with flue gas waste heat recovery function provided by the present invention has a second muffler component set up, so that the smoke after being silenced by the first muffler component will be ejected from the first exhaust hole and collide with the muffler ring plate, and the muffler ring plate is trumpet-shaped, so that the smoke can be dispersed and decelerated to achieve the effect of silencing, and the dispersed and decelerated smoke will fully contact with the inside of the pipe body again to recover the waste heat. In the process of smoke dispersion, the speed of smoke outflowing from the second exhaust hole or the third exhaust hole can be slowed down by the action of the guide cover, thereby extending the time for the smoke to fully contact the inside of the pipe body and ensuring the efficiency of waste heat recovery. At the same time, in the process of smoke dispersion and deceleration in the three groups of muffler ring plates, the second exhaust holes opened on one side of the muffler ring plate located in the middle are distributed in a circular shape, so that the smoke discharged from the third exhaust hole can first collide with the muffler ring plate before being discharged from the second exhaust hole, further weakening the ability of sound waves, effectively improving the muffler effect of the entire muffler, and meeting people's muffler needs. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0027] Figure 1 It is a schematic diagram of the overall left side structure of the present invention.

[0028] Figure 2 It is a schematic diagram of the overall right side structure of the present invention.

[0029] Figure 3 It is a cross-sectional structural schematic diagram of the present invention.

[0030] Figure 4 For the present invention Figure 3 Schematic diagram of the enlarged structure at point A in the middle.

[0031] Figure 5 It is a schematic diagram of the half-section plan structure of the present invention.

[0032] Figure 6 It is a schematic diagram of the overall structure of the soundproof cover after being disassembled according to the present invention.

[0033] Figure 7 The left side structural schematic diagram of the internal structure of the tube body of the present invention is disassembled.

[0034] Figure 8 The right side structural schematic diagram of the internal structure of the tube body of the present invention is disassembled.

[0035] Fig. 9It is a schematic structural diagram of the first spoiler and the second spoiler of the present invention distributed on the outer wall of the circular plate.

[0036] Fig.10 It is a schematic diagram of the front structure of the filter mesh plate after being disassembled.

[0037] Fig.11 It is a schematic diagram of the back structure of the filter mesh plate of the present invention.

[0038] Fig.12 It is a schematic diagram of the flow direction of smoke inside the pipe body of the present invention.

[0039] In the figure:

[0040] 1. Soundproof cover; 2. Pipe body; 3. Water inlet pipe; 4. Docking plate; 5. Ring plate frame; 6. Filter mesh plate; 7. Fixed column; 8. Drain pipe; 9. Mesh cover; 10. Soundproof cotton; 11. Sealing cover; 12. Spiral blade; 13. Heat exchange flow channel; 14. Circular plate; 15. Guide cover; 16. First exhaust hole; 17. Silencing ring plate; 18. Second exhaust hole; 19. Third exhaust hole; 20. First silencer; 21. First guide vane; 22. Second silencer; 23. Second guide vane; 24. Reflux hole; 25. Fan blade; 26. Rotating column; 27. Arc rod; 28. Arc groove; 30. Fourth exhaust hole; 31. Connecting frame; 32. Brush roller; 33. Tooth groove; 34. First spoiler; 35. Second spoiler. DETAILED DESCRIPTION

[0041] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of the present invention.

[0042] See also Figure 1-Figure 12 , a silencer with flue gas waste heat recovery function, comprising a pipe body 2, both ends of the pipe body 2 are fixedly connected with a docking plate 4, the circumferential outer wall of the pipe body 2 is fixedly connected with a soundproof cover 1, the circumferential inner wall of the soundproof cover 1 is respectively fixedly connected with a sealing cover 11 and a mesh cover 9, the mesh cover 9 is sleeved on the outside of the sealing cover 11, the sealing cover 11, the mesh cover 9 and the soundproof cover 1 form a silencer cavity, the interior of the silencer cavity is filled with soundproofing cotton 10, the circumferential outer wall of the pipe body 2 is fixedly connected with a spiral blade 12, the spiral blade 12 is fixedly connected with the circumferential inner wall of the sealing cover 11, the soundproofing cotton 10 can not only play a good sound insulation effect, but also can play a certain role in heat preservation for the water flow in the waste heat recovery process, to avoid the water flow after heat exchange and the air to fully exchange heat and cause heat loss;

[0043] The spiral blades 12, the circumferential outer wall of the tube body 2, and the circumferential inner wall of the sealing cover 11 form a spiral heat exchange flow channel 13. The two ends of the sound insulation cover 1 are respectively fixedly connected with the water inlet pipe 3 and the drain pipe 8. The water inlet pipe 3 and the drain pipe 8 are both connected to the heat exchange flow channel 13. The pitch of the spiral blades 12 gradually increases along the direction away from the water inlet pipe 3. The heat exchange flow channel 13 is spiral, which effectively prolongs the heat exchange time between the heat exchange flow channel 13 and the high-temperature flue gas. At the same time, the flue gas temperature here is the highest, so the pitch of the spiral blades 12 gradually increases from the direction away from the water inlet pipe 3, which can ensure that the density of the heat exchange flow channel 13 here is greater than that of other areas, so that the cold water can fully exchange heat with the high-temperature flue gas.

[0044] A filter assembly for removing impurities from smoke is provided in the docking plate 4 near the water inlet pipe 3;

[0045] A first silencer component and a second silencer component are respectively arranged inside the tube body 2 .

[0046] Preferably, the first silencer assembly includes a circular plate 14 fixedly connected to the circumferential inner wall of the tube body 2, a first silencer 20 is fixedly connected to the outer wall of one side of the circular plate 14, a first guide plate 21 distributed in a circular shape with equal distances is fixedly connected to the circumferential outer wall of the first silencer 20, a return flow hole 24 distributed in a circular shape with equal distances is opened on the circumferential outer wall of the first silencer 20, a second silencer 22 is fixedly connected to the inner wall of one end of the first silencer 20, a second guide plate 23 distributed in a circular shape with equal distances is fixedly connected to the circumferential outer wall of the second silencer 22, and the first guide plate 21 and the second guide plate 23 are both spirally connected. The fourth exhaust hole 30 is provided on the circumferential outer wall of the second silencer 22, and the first exhaust hole 16 is provided in the middle of the circular plate 14. The high-temperature flue gas flows back along the guidance of the first guide plate 21 and flows into the interior of the first silencer 20 through the reflux hole 24. The high-temperature flue gas flowing into the interior of the silencer will flow out from the fourth exhaust hole 30 through the guidance of the second guide plate 23. In this process, the reflux of the flue gas is realized, thereby extending the collision path of the flue gas with the first guide plate 21 and the second guide plate 23, further weakening the sound waves generated when the flue gas flows, and achieving a good silencing effect.

[0047] Preferably, the outer wall of one side of the circular plate 14 close to the first silencer 20 is fixedly connected with a first spoiler 34 and a second spoiler 35 which are equidistantly distributed in a circle, and the cross-sections of the first spoiler 34 and the second spoiler 35 are both arc-shaped. When the high-temperature flue gas flows in contact with the outer wall of one side of the circular plate 14, the first spoiler 34 and the second spoiler 35 arranged on the outer wall of the circular plate 14 can form a vortex in the high-temperature flue gas, thereby prolonging the residence time of the high-temperature flue gas on one side of the circular plate 14, and further improving the heat exchange efficiency between the high-temperature flue gas and cold water.

[0048] Preferably, the second silencer assembly includes a silencer ring plate 17 connected to the circumferential inner wall of the pipe body 2, and the number of the silencer ring plates 17 is three groups, and the three groups of silencer ring plates 17 are all trumpet-shaped. A third exhaust hole 19 is opened in the middle of two groups of silencer ring plates 17, and a second exhaust hole 18 distributed in a circular shape and at equal distances is opened in the middle of one group of silencer ring plates 17. The flue gas silenced by the first silencer assembly will be ejected from the first exhaust hole 16 and collide with the silencer ring plate 17, and the silencer ring plate 17 is trumpet-shaped, so that the flue gas can be dispersed and decelerated to achieve the effect of silence, and the dispersed and decelerated flue gas will fully contact the inside of the pipe body 2 again for waste heat recovery.

[0049] Preferably, the silencer ring plate 17 with the second exhaust hole 18 is located in the middle of the two groups of silencer ring plates 17 with the third exhaust hole 19. In the process of smoke being dispersed and decelerated in the three groups of silencer ring plates 17, the second exhaust holes 18 opened on one side of the silencer ring plate 17 located in the middle are distributed in a circular shape, so that the smoke discharged from the third exhaust hole 19 can first collide with the silencer ring plate 17 before being discharged from the second exhaust hole 18, further weakening the capacity of the sound waves, effectively improving the silencer effect of the entire silencer, and meeting people's silencer needs.

[0050] Preferably, the curvature of the silencer ring plate 17 gradually decreases in the direction away from the circular plate 14, thereby preventing the smoke from being decelerated too much inside the tube body 2 and causing the flow rate to be too slow, thereby ensuring the stability of the smoke emission process.

[0051] Preferably, the circular plate 14 and the outer wall of one side of the two groups of silencer ring plates 17 are fixedly connected with a guide cover 15, and the cross-section of the guide cover 15 is arc-shaped. During the smoke dispersion process, the speed of smoke flowing out of the second exhaust hole 18 or the third exhaust hole 19 can be slowed down by the action of the guide cover 15, thereby extending the time of full contact with the inside of the smoke pipe body 2 and ensuring the efficiency of waste heat recovery.

[0052] Preferably, the filter assembly includes a ring plate frame 5 fixedly connected to the inside of a group of docking plates 4, a filter mesh plate 6 is fixedly connected to the inside of the ring plate frame 5, one side outer wall of the filter mesh plate 6 is flush with one side outer wall of the ring plate frame 5, and the other side outer wall of the filter mesh plate 6 is provided with an arc groove 28, and the arc grooves 28 are equidistantly distributed on the outer wall of the filter mesh plate 6, one side of the ring plate frame 5 is fixedly connected with an arc rod 27 equidistantly distributed, the arc rod 27 is located in the middle of the two groups of arc grooves 28, and the outer wall of the arc rod 27 close to the filter mesh plate 6 is provided with tooth grooves 33 equidistantly distributed in an arc shape, and the middle part of the ring plate frame 5 is rotatably connected with a rotating column 26. One end of the rotating column 26 away from the annular plate frame 5 is rotatably connected to the outer wall of one end of the first silencer 20, the circumferential outer wall of the rotating column 26 is fixedly connected with a shaft sleeve, and the circumferential outer wall of the shaft sleeve is fixedly connected with the fan blades 25 distributed in a circle at equal distances, one end of the rotating column 26 is fixedly connected with a fixed column 7, and the circumferential outer wall of the fixed column 7 is fixedly connected with a connecting frame 31, and both sides of the connecting frame 31 are rotatably connected with brush rollers 32. After the high-temperature flue gas enters the docking plate 4, it will first contact the filter mesh plate 6. The filter mesh plate 6 can not only filter and remove impurities from the high-temperature flue gas, but also prevent impurities in the high-temperature flue gas from entering the pipe body 2 and settling to form After the scale is formed, the service life and silencing effect of the silencer will be affected. At the same time, the porous structure of the filter mesh plate 6 can make the sound waves generated by the flue gas flow reflect back and forth on the inner surface of the pores, thereby achieving a sound absorption effect. Subsequently, after the high-temperature flue gas flows out from the other side of the filter mesh plate 6, part of the flue gas will be discharged from the arc groove 28. The flue gas discharged from the arc groove 28 will first hit its inner wall, thereby consuming a certain amount of the sound waves generated by the flue gas flow. At the same time, another part of the flue gas will collide with the tooth groove 33 on the outer wall of one side of the arc rod 27, thereby causing the sound waves to be reflected and collided inside the tooth groove 33 to be weakened to a certain extent, thereby achieving After the initial silencing and noise reduction of the flue gas, the flue gas then enters the interior of the tube body 2. The flue gas entering the tube body 2 will first come into contact with the fan blades 25. As the smoke continues to flow in, the smoke will push the fan blades 25 to rotate. The rotation of the fan blades 25 can consume the kinetic energy of the smoke flow, thereby reducing the noise of the smoke flow. In the process of rotation of the fan blades 25, the rotating column 26 can be driven to rotate. In the process of rotation of the rotating column 26, the fixed column 7, the connecting frame 31 and the brush roller 32 at one end thereof can be driven to rotate together, thereby cleaning the surface of the filter mesh plate 6 to avoid clogging of the filter mesh plate 6 after long-term use.

[0053] In summary, with the help of the above technical solution of the present invention, when in use, the high-temperature flue gas will first pass through the docking plate 4 to the inside of the pipe body 2. After the high-temperature flue gas enters the docking plate 4, it will first contact the filter mesh plate 6. The filter mesh plate 6 can not only filter and remove impurities from the high-temperature flue gas, but also prevent the impurities carried by the high-temperature flue gas from entering the pipe body 2 and settling to form scale, which affects the service life and silencing effect of the muffler. At the same time, the porous structure of the filter mesh plate 6 can make the sound waves generated by the flow of the flue gas pass through the filter mesh plate 6. The inner surface of the pores reflects back and forth, thereby achieving a sound absorption effect. After the high-temperature smoke flows out from the other side of the filter mesh plate 6, part of the smoke will be discharged from the arc groove 28. The smoke discharged from the arc groove 28 will first hit its inner wall, thereby being able to consume a certain amount of sound waves generated by the smoke flow. At the same time, another part of the smoke will collide with the tooth groove 33 on the outer wall of one side of the arc rod 27, thereby being able to cause the sound waves to be reflected and collided inside the tooth groove 33 to be weakened to a certain extent, thereby being able to achieve preliminary silencing and noise reduction of the smoke.

[0054] Then the smoke enters the tube body 2, and the smoke entering the tube body 2 will first contact the fan blades 25. As the smoke continues to flow in, the smoke will push the fan blades 25 to rotate. The rotation of the fan blades 25 can consume the kinetic energy of the smoke flow, thereby reducing the noise of the smoke flow. In the process of the rotation of the fan blades 25, the rotating column 26 can be driven to rotate. In the process of the rotation of the rotating column 26, the fixed column 7, the connecting frame 31 and the brush roller 32 at one end thereof can be driven to rotate together, so that the surface of the filter mesh plate 6 can be cleaned to avoid clogging of the filter mesh plate 6 after long-term use.

[0055] After the high-temperature flue gas blows the fan blades 25, it will collide with the end surface of the first silencer 20, and then diffuse along the outer wall of the first silencer 20 and flow toward the direction close to the circular plate 14. At this time, the high-temperature flue gas will fully contact the circumferential inner wall of the tube body 2. After the high-temperature flue gas fully contacts the inside of the tube body 2, it will fully exchange heat with the cold water inside the heat exchange flow channel 13. At the same time, the cold water and the high-temperature flue gas are only separated by the tube body 2, so no other heat transfer consumption will be generated. At the same time, the heat exchange flow channel 13 is spiral, which effectively prolongs the heat exchange time between the heat exchange flow channel 13 and the high-temperature flue gas. The flue gas temperature is at the highest state here, so the pitch of the spiral blade 12 gradually increases from the end away from the water inlet pipe 3, which can ensure that the density of the heat exchange channel 13 here is greater than that of other areas, so that the cold water can fully exchange heat with the high-temperature flue gas. When the high-temperature flue gas flows in contact with the outer wall of one side of the circular plate 14, the first spoiler 34 and the second spoiler 35 arranged on the outer wall of the circular plate 14 can form a vortex in the high-temperature flue gas, thereby prolonging the residence time of the high-temperature flue gas on one side of the circular plate 14, further improving the heat exchange efficiency between the high-temperature flue gas and the cold water.

[0056] Subsequently, the high-temperature flue gas flows back along the guidance of the first guide plate 21 and flows into the interior of the first muffler 20 through the return hole 24. The high-temperature flue gas flowing into the interior of the muffler will flow out from the fourth exhaust hole 30 through the guidance of the second guide plate 23. In this process, the flue gas flows back, thereby extending the collision path between the flue gas and the first guide plate 21 and the second guide plate 23, further weakening the sound waves generated when the flue gas flows, and achieving a good silencing effect. The flue gas silenced by the first muffler assembly will be ejected from the first exhaust hole 16 and collide with the muffler ring plate 17, and the muffler ring plate 17 is trumpet-shaped, so that the flue gas can be dispersed and decelerated to achieve the silencing effect, and the dispersed and decelerated flue gas will fully contact with the inside of the pipe body 2 again for waste heat recovery. In the process of smoke dispersion, the speed of the smoke flowing out of the second exhaust hole 18 or the third exhaust hole 19 can be slowed down by the action of the guide cover 15, thereby extending the time for the smoke to fully contact the inside of the pipe body 2 and ensuring the efficiency of waste heat recovery.

[0057] At the same time, when the smoke is dispersed and decelerated in the three groups of silencer ring plates 17, the second exhaust holes 18 opened on one side of the middle silencer ring plate 17 are distributed in a circular shape, so that the smoke discharged from the third exhaust hole 19 can first collide with the silencer ring plate 17 before being discharged from the second exhaust hole 18, further weakening the ability of the sound waves, effectively improving the silencer effect of the entire silencer, and meeting people's silencer needs.

[0058] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A muffler with flue gas waste heat recovery function, comprising a pipe body (2), characterized in that: Both ends of the tube body (2) are fixedly connected to docking plates (4); the circumferential outer wall of the tube body (2) is fixedly connected to a soundproof cover (1); the circumferential inner wall of the soundproof cover (1) is respectively fixedly connected to a sealing cover (11) and a mesh cover (9); the mesh cover (9) is sleeved on the outside of the sealing cover (11); the sealing cover (11), the mesh cover (9) and the soundproof cover (1) form a soundproofing cavity; the interior of the soundproofing cavity is filled with soundproofing cotton (10); the circumferential outer wall of the tube body (2) is fixedly connected to a spiral blade (12); the spiral blade (12) is fixedly connected to the circumferential inner wall of the sealing cover (11); The spiral blades (12), the circumferential outer wall of the tube body (2), and the circumferential inner wall of the sealing cover (11) form a spiral heat exchange flow channel (13); the two ends of the sound insulation cover (1) are respectively fixedly connected to a water inlet pipe (3) and a drain pipe (8); the water inlet pipe (3) and the drain pipe (8) are both connected to the heat exchange flow channel (13); and the pitch of the spiral blades (12) gradually increases in a direction away from the end of the water inlet pipe (3); A filter assembly for removing impurities from smoke is arranged in the docking plate (4) close to the water inlet pipe (3); A first silencer assembly and a second silencer assembly are respectively arranged inside the tube body (2), the first silencer assembly comprising a circular plate (14) fixedly connected to the circumferential inner wall of the tube body (2), a first silencer tube (20) fixedly connected to the outer wall of one side of the circular plate (14), a first guide vane (21) equidistantly distributed in a circular pattern fixedly connected to the circumferential outer wall of the first silencer tube (20), a reflux hole (24) equidistantly distributed in a circular pattern is provided on the circumferential outer wall of the first silencer tube (20), a second silencer tube (22) fixedly connected to the inner wall of one end of the first silencer tube (20), a first guide vane (21) equidistantly distributed in a circular pattern fixedly connected to the circumferential outer wall of the first silencer tube (20), The second guide plate (23) is provided with a spiral shape, the first guide plate (21) and the second guide plate (23) are both spiral-shaped, the circumferential outer wall of the second silencer tube (22) is provided with a fourth exhaust hole (30), the middle portion of the circular plate (14) is provided with a first exhaust hole (16), the second silencer assembly comprises a silencer ring plate (17) connected to the circumferential inner wall of the tube body (2), the number of the silencer ring plates (17) is three groups, the three groups of the silencer ring plates (17) are all trumpet-shaped, the middle portions of two groups of the silencer ring plates (17) are provided with a third exhaust hole (19), and the middle portion of one group of the silencer ring plates (17) is provided with second exhaust holes (18) distributed in a circle at equal distances.

2. The muffler with flue gas waste heat recovery function according to claim 1 is characterized in that: A first spoiler (34) and a second spoiler (35) are fixedly connected to an outer wall of one side of the circular plate (14) close to the first silencer (20) and are distributed in a circular shape at equal distances; the cross sections of the first spoiler (34) and the second spoiler (35) are both arc-shaped.

3. The muffler with flue gas waste heat recovery function according to claim 2 is characterized in that: The silencer ring plate (17) provided with the second exhaust hole (18) is located in the middle of the two groups of silencer ring plates (17) provided with the third exhaust hole (19).

4. The muffler with flue gas waste heat recovery function according to claim 3 is characterized in that: The curvature of the silencer ring plate (17) gradually decreases in a direction away from the circular plate (14).

5. The muffler with flue gas waste heat recovery function according to claim 2 is characterized in that: The circular plate (14) and the outer walls of one side of the two groups of silencer ring plates (17) are both fixedly connected with a flow guide cover (15), and the cross section of the flow guide cover (15) is in the shape of a circular arc.

6. The muffler with flue gas waste heat recovery function according to claim 4 is characterized in that: The filter assembly comprises a ring plate frame (5) fixedly connected to the inside of a group of docking plates (4); a filter mesh plate (6) is fixedly connected to the inside of the ring plate frame (5); an outer wall on one side of the filter mesh plate (6) is flush with an outer wall on one side of the ring plate frame (5); an arc groove (28) is formed on the outer wall on the other side of the filter mesh plate (6); and the arc grooves (28) are distributed at equal distances on the outer wall of the filter mesh plate (6).

7. The muffler with flue gas waste heat recovery function according to claim 6 is characterized in that: One side of the ring plate frame (5) is fixedly connected to arc-shaped rods (27) distributed at equal distances, the arc-shaped rods (27) are located in the middle of the two groups of arc-shaped grooves (28), and the outer wall of the arc-shaped rod (27) on one side close to the filter mesh plate (6) is provided with tooth grooves (33) distributed in an arc shape at equal distances.

8. The muffler with flue gas waste heat recovery function according to claim 7 is characterized in that: A rotating column (26) is rotatably connected to the middle of the annular plate frame (5); one end of the rotating column (26) away from the annular plate frame (5) is rotatably connected to the outer wall of one end of the first silencer (20); a shaft sleeve is fixedly connected to the circumferential outer wall of the rotating column (26); fan blades (25) distributed in a circular shape and at equal distances are fixedly connected to the circumferential outer wall of the shaft sleeve; one end of the rotating column (26) is fixedly connected to a fixed column (7); the circumferential outer wall of the fixed column (7) is fixedly connected to a connecting frame (31); and brush rollers (32) are rotatably connected to both sides of the connecting frame (31).

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