A low-temperature methanol-washed tail gas thermal storage oxidation flue gas recirculation coupling device

Abstract

The present invention relates to the field of separation technology, and specifically discloses a low-temperature methanol-washed tail gas thermal storage oxidation flue gas recirculation coupling device, comprising a dilution box and an air guide mechanism arranged in a ring array around the dilution box, the inner side wall of the dilution box is provided with a separation mechanism for separating the gas entering the dilution box, and the bottom inner wall of the dilution box is provided with a dilution mechanism. The present invention transports part of the gas burned in the thermal oxidation furnace back to the thermal oxidation furnace through an air pipe and an air guide mechanism, and dilutes the tail gas with fresh air for circulating combustion, thereby introducing the tail gas purified by the thermal oxidation furnace as circulating gas and mixing it with the original waste gas to achieve precise dilution, effectively reducing the concentration of organic matter in the tail gas, avoiding safety hazards such as unstable operation of the thermal oxidation furnace due to excessive concentration, and at the same time using the waste heat of the circulating gas to preheat the intake air, thereby improving the thermal efficiency of the system and reducing energy consumption.

Description

Technical Field

[0001] The present invention relates to the field of separation technology, in particular to a low-temperature methanol tail gas washing thermal storage oxidation flue gas recirculation coupling device. Background Art

[0002] During the low-temperature methanol scrubbing process in coal chemical plants, waste gas typically contains high concentrations of volatile organic compounds. Directly feeding the waste gas into a regenerative thermal oxidizer can lead to excessively high combustion temperatures, potentially causing equipment overheating, excessive NOx levels, and even deflagration. Traditional methods use fresh air dilution, but this introduces excessive oxygen, increases system energy consumption, and prevents precise control of waste gas concentration.

[0003] Publication number CN118454366B discloses a carbon dioxide capture device for flue gas treatment and its implementation method, which aims to squeeze out the grease contained in the impurities on the filter cloth through the cooperation of a hollow plate and an extrusion roller, so that the impurities on the filter cloth can be separated from the filter cloth and collected.

[0004] Based on the existing technology, the following problems exist:

[0005] The existing tail gas treatment device is not convenient for using the tail gas purified by the thermal oxidation furnace as circulating gas to mix with the original exhaust gas and fresh air, which makes it inconvenient to achieve precise dilution. It is easy to cause safety hazards such as unstable operation of the thermal oxidation furnace due to excessive concentration. It is also not convenient to synchronously treat the circulating gas, fresh air and original exhaust gas, such as burning after separation and dilution, which is easy to cause incomplete local combustion or local explosion, affecting the actual use of tail gas treatment. There are certain shortcomings. In order to solve the above problems, a low-temperature methanol washing tail gas heat storage oxidation flue gas recirculation coupling device is proposed. Summary of the Invention

[0006] In order to overcome the shortcomings of the above-mentioned prior art, the present invention provides a low-temperature methanol-washed tail gas thermal storage oxidation flue gas recirculation coupling device, which is convenient for using the tail gas purified by the thermal oxidation furnace as circulating gas, mixing it with the original exhaust gas and fresh air, and realizing precise dilution, thereby avoiding safety hazards such as unstable operation of the thermal oxidation furnace due to excessive concentration, and facilitating the synchronous processing of the circulating gas, fresh air and original exhaust gas, thereby reducing the occurrence of incomplete local combustion or local explosion.

[0007] To achieve the above objectives, the present invention is implemented through the following technical solutions: a low-temperature methanol-washed tail gas thermal storage oxidation flue gas recirculation coupling device, comprising a thermal oxidation furnace, an air intake pipe and an exhaust pipe fixedly arranged at the air intake end and the exhaust end of the thermal oxidation furnace, a dilution box, an air guide mechanism arranged in a ring array around the dilution box, and an air supply pipe for connecting the exhaust pipe and one of the air guide mechanisms, the inner side wall of the dilution box is provided with a separation mechanism for separating the gas entering the dilution box, and the bottom inner wall of the dilution box is provided with a dilution mechanism for diluting the gas separated by the separation mechanism, and the separation mechanism includes:

[0008] The mounting ring is fixedly mounted on the inner wall of the dilution box, and an annular groove is formed on the outer wall of the mounting ring;

[0009] The ring body is sleeved on the inner side of the annular groove. The outer wall of the ring body is embedded with the first filter screen, the second filter screen and the third filter screen arranged in a circular array. The inner wall of the annular groove is fixed with the fourth filter screen, the fifth filter screen and the sixth filter screen arranged corresponding to the first filter screen, the second filter screen and the third filter screen respectively, so as to separate the gas entering the dilution box.

[0010] Furthermore, the separation mechanism also includes a first sealing plate, a second sealing plate and a third sealing plate fixedly arranged on the top inner wall and the bottom inner wall of the annular groove. The first sealing plate, the second sealing plate and the third sealing plate are respectively arranged corresponding to the positions of the first filter screen, the second filter screen and the third filter screen. There is a gap between the two first sealing plates, between the two second sealing plates and between the two third sealing plates to allow the gas to enter the dilution box after separation. The top inner wall and the bottom inner wall of the annular groove and on both sides of the first sealing plate are respectively fixed with a fourth sealing plate and a fifth sealing plate.

[0011] Furthermore, the separation mechanism further comprises:

[0012] The sixth sealing plate is fixedly arranged on the top inner wall and the bottom inner wall of the annular groove, and is located on the side of the third filter screen away from the second filter screen. The sixth sealing plate is fixedly connected to the third sealing plate and the inner wall of the annular groove, and is designed to be sealed. The fourth sealing plate and the fifth sealing plate are fixedly connected to the first sealing plate and the inner wall of the annular groove, and are designed to be sealed. The side walls of the fourth sealing plate, the fifth sealing plate and the sixth sealing plate are provided with through grooves for sleeved ring bodies, so that the ring bodies can rotate along the side walls of the fourth sealing plate, the fifth sealing plate and the sixth sealing plate. The ring body is concentrically arranged with the mounting ring, and a distance is left between the inner wall of the ring body and the inner wall of the annular groove.

[0013] Furthermore, notches are provided on the inner sides of the two first sealing plates, the second sealing plates, and the third sealing plates, which are close to each other, so that the outer sides of the two first sealing plates, the second sealing plates, and the third sealing plates, which are close to each other, fit in contact with the outer wall of the ring body, and sealing strips arranged at intervals are fixedly provided on the notches of the first sealing plates, the second sealing plates, and the third sealing plates;

[0014] The inner walls of the side wall grooves of the fourth sealing plate, the fifth sealing plate and the sixth sealing plate are fixed with sealing rings arranged at intervals to seal the connection between the ring body and the fourth sealing plate, the fifth sealing plate and the sixth sealing plate when the ring body rotates.

[0015] Furthermore, the separation mechanism further comprises:

[0016] The servo motor is fixed on the outer wall of the dilution box and is located at the bottom of the air intake pipe. The output shaft of the servo motor is fixed with a rotating shaft extending into the dilution box through a coupling. A gear is fixed on the side wall of one end of the rotating shaft located in the dilution box. The rotating shaft is rotatably connected to the dilution box. The bottom of the ring body is provided with tooth grooves arranged in a circular array and meshing with the gear.

[0017] Furthermore, the separation mechanism further comprises:

[0018] The first scraper is fixed in an annular array on the inner wall of the dilution box and fits with the outer wall of the ring body. The inner wall of the arc-shaped groove is fixed with a second scraper arranged in an annular array, and the second scraper fits with the inner wall of the ring body.

[0019] The third scraper is fixed on the inner wall of the ring body in an annular array and fits with the inner wall of the arc-shaped groove. The positions of the first scraper, the second scraper and the third scraper correspond to the positions of the first filter screen, the second filter screen and the third filter screen.

[0020] Furthermore, the dilution mechanism includes:

[0021] The box body is fixedly arranged on the bottom inner wall of the dilution box, and the inner wall of the box body is fixedly provided with tubes arranged in a circular array and extending to the outside of the box;

[0022] The first connecting pipe is fixedly arranged on the inner wall of the mounting ring in a circular array, and is respectively sleeved on the outside of the fourth filter, the fifth filter and the sixth filter, so that the gas enters the first connecting pipe after being separated by the fourth filter, the fifth filter and the sixth filter. The first connecting pipe is fixedly connected to the end of the tube body located outside the box, and the end of the tube body located inside the box is designed to be inclined so that the gas enters the box along the inclined angle.

[0023] Furthermore, the dilution mechanism further comprises:

[0024] The vortex blades are rotatably arranged on the bottom inner wall and the top inner wall of the box body so that the vortex blades rotate under the action of the gas flowing along the inclined trajectory. The top of the box body is provided with guide holes arranged in a circular array. The upper end of the box body is designed in a frustum shape to limit the flow space of the gas entering the upper end of the box body. The air inlet end of the intake pipe is fixedly connected to the top exhaust end of the box body and is connected to each other. The outer wall of the intake pipe is provided with a valve body.

[0025] Furthermore, the air guide mechanism includes:

[0026] The first air ducts are fixedly mounted on the outer wall of the dilution box in an annular array and extend to the inner side of the annular groove. The outer wall of the first air ducts is fixedly provided with second connecting pipes, so that the first air ducts are connected to the second air ducts via the second connecting pipes, and one of the second air ducts is connected to the gas delivery pipe;

[0027] The lower tube body is fixedly arranged at the bottom of the second connecting tube and is communicated with the second connecting tube and the first air guide tube. The outer walls of the first air guide tube and the second air guide tube are both provided with valve bodies.

[0028] Furthermore, the air guide mechanism further includes:

[0029] A threaded rod is threadedly connected to the outer wall of the second air duct and extends into the second air duct. A connecting rod is fixedly provided at the bottom of the threaded rod. A blocking block is fixedly provided at the bottom of the connecting rod, and the bottom of the blocking block is designed to be arc-shaped so that when the blocking block is at the top dead center, the bottom of the blocking block fits with the top inner wall of the first air duct. When the blocking block is at the bottom dead center, the entire blocking block is located in the lower tube body, and the cross-section of the connecting rod is designed to be elliptical.

[0030] The present invention provides a low-temperature methanol tail gas washing thermal storage oxidation flue gas recirculation coupling device. Compared with the existing technology, it has the following advantages:

[0031] 1. The present invention transports part of the gas burned in the thermal oxidation furnace back into the thermal oxidation furnace through an air pipe and an air guide mechanism, and dilutes the tail gas with fresh air for circulating combustion. The tail gas purified by the thermal oxidation furnace is introduced as circulating gas and mixed with the original waste gas to achieve precise dilution, effectively reducing the concentration of organic matter in the tail gas, avoiding safety hazards such as unstable operation of the thermal oxidation furnace due to excessive concentration, and at the same time using the waste heat of the circulating gas to preheat the intake air, thereby improving the thermal efficiency of the system and reducing energy consumption.

[0032] 2. The present invention integrates the air guide mechanism into the outer wall of the dilution box, thereby facilitating the separation mechanism to simultaneously separate the circulating gas, exhaust gas and fresh air, and to simultaneously clean the separation mechanism, thereby facilitating continuous separation and subsequent dilution, so as to facilitate the synchronous treatment of the circulating gas, exhaust gas and fresh air, thereby facilitating the actual separation and purification of the exhaust gas in the thermal oxidation furnace.

[0033] 3. The present invention filters impurities in exhaust gas, fresh air and circulating gas respectively through a separation mechanism, thereby reducing the amount of particulate matter or crystals attached to the inner wall, flue, valve and other parts of the thermal oxidation furnace, avoiding affecting the flow and purification efficiency of the flue gas, and can separate carbon dioxide in the circulating gas, reduce the concentration of carbon dioxide in the circulating gas, thereby reducing the space occupied by carbon dioxide in the combustion chamber after dilution of fresh air, exhaust gas and circulating gas, thereby avoiding reducing the proportion of oxygen and other combustible components, and avoiding the problem of incomplete combustion and affecting the combustion effect of the thermal oxidation furnace.

[0034] 4. The present invention makes the ring body rotate back and forth in a small distance, so as to facilitate the synchronous cleaning of the first filter screen, the second filter screen, the third filter screen, the fourth filter screen, the fifth filter screen and the sixth filter screen, which is convenient for long-term separation and use. In the cleaning process, the circulating gas is prevented from mixing with the exhaust gas and the fresh air, thereby avoiding affecting the filtration of carbon dioxide. At the same time, the fresh air and the exhaust gas are pre-diluted to improve the dilution effect and avoid the exhaust gas concentration being too high, which affects the separation effect.

[0035] 5. The present invention uses a recoil mechanism to recoil the first filter screen, etc., and cooperates with the separation mechanism to facilitate the long-term separation use of the separation mechanism, and avoids the accumulation of impurities at the connection between the first air duct and the second air duct during the recoil process. After the recoil is completed, the impurities are brought to the first filter screen, etc. again, affecting the recoil effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0037] Figure 2 This is a schematic structural diagram of the air intake pipe, air delivery pipe, air guide mechanism and dilution box of the present invention;

[0038] Figure 3 This is a schematic diagram of the air guide mechanism, dilution box and air intake pipe structure of the present invention;

[0039] Figure 4 This is a schematic diagram of the explosion and cross-sectional structure of the dilution box of the present invention;

[0040] Figure 5 This is a schematic cross-sectional view of the dilution box, ring body and mounting ring of the present invention;

[0041] Figure 6 This is a schematic diagram of the internal structure of the annular groove of the present invention;

[0042] Figure 7 This is a schematic structural diagram of the second sealing plate, the second filter screen, the third sealing plate, the third filter screen and the sixth sealing plate of the present invention;

[0043] Figure 8 This is a schematic diagram of the explosion structure of the ring body and the mounting ring of the present invention;

[0044] Figure 9 This is a schematic cross-sectional structural diagram of a fourth sealing plate of the present invention;

[0045] Figure 10 It is a schematic structural diagram of the first sealing plate, the second sealing plate, the third sealing plate and the fourth sealing plate of the present invention;

[0046] Figure 11 Schematic diagram of the servo motor and ring structure of the present invention;

[0047] Figure 12 Schematic diagram of the dilution mechanism structure of the present invention;

[0048] Figure 13 This is a schematic diagram of the cross-sectional structure of the box body of the present invention;

[0049] Figure 14 Schematic diagram of the tube body and vortex blade structure of the present invention;

[0050] Figure 15 Schematic diagram of the structure of the gas guide mechanism of the present invention;

[0051] Figure 16 This is a schematic cross-sectional view of the second connecting tube, the lower tube body, and the first air guide tube of the present invention;

[0052] Figure 17 This is a schematic structural diagram of the blocking block and the lower tube body of the present invention;

[0053] Figure 18 It is a schematic structural diagram of the connecting rod and threaded rod of the present invention.

[0054] Reference numerals in the above drawings: 1, thermal oxidation furnace; 2, exhaust pipe; 3, gas transmission pipe; 4, air inlet pipe; 5, air guide mechanism; 6, dilution box; 7, separation mechanism; 8, dilution mechanism;

[0055] 51. Second air guide tube; 52. Second connecting tube; 53. Lower tube body; 54. First air guide tube; 55. Threaded rod; 56. Connecting rod; 57. Blocking block;

[0056] 71. Mounting ring; 72. Ring body; 73. Annular groove; 74. First sealing plate; 75. Fourth sealing plate; 76. First filter screen; 77. Fifth sealing plate; 78. Second filter screen; 79. Second sealing plate; 791. Third filter screen; 792. Third sealing plate; 793. Sixth sealing plate; 794. Fourth filter screen; 795. Fifth filter screen; 796. Sealing strip; 797. Sealing ring; 798. Servo motor; 799. Third scraper; 7991. Second scraper; 7992. First scraper; 7993. Sixth filter screen;

[0057] 81. First connecting pipe; 82. Box body; 83. Vortex blades; 84. Tube body. DETAILED DESCRIPTION

[0058] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. 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 without making creative efforts are within the scope of protection of the present invention.

[0059] Example 1: Please refer to Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 、 Figure 7 and 8 A low-temperature methanol-washed tail gas thermal storage oxidation flue gas recirculation coupling device includes a thermal oxidation furnace 1, an air intake pipe 4 and an exhaust pipe 2 fixedly installed at the air intake and exhaust ends of the thermal oxidation furnace 1, a dilution box 6, air guide mechanisms 5 arranged in a ring array around the dilution box 6, and an air supply pipe 3 for connecting the exhaust pipe 2 and one of the air guide mechanisms 5. The inner side wall of the dilution box 6 is provided with a separation mechanism 7 for separating the gas entering the dilution box 6. The bottom inner wall of the dilution box 6 is provided with a dilution mechanism 8 for diluting the gas separated by the separation mechanism 7. The separation mechanism 7 includes:

[0060] The mounting ring 71 is fixed to the inner wall of the dilution box 6, and the outer wall of the mounting ring 71 is provided with an annular groove 73;

[0061] The ring body 72 is sleeved on the inner side of the annular groove 73. The outer wall of the ring body 72 is embedded with a first filter screen 76, a second filter screen 78 and a third filter screen 791 arranged in a circular array. The inner wall of the annular groove 73 is fixed with a fourth filter screen 794, a fifth filter screen 795 and a sixth filter screen 7993 arranged corresponding to the first filter screen 76, the second filter screen 78 and the third filter screen 791 respectively, so as to separate the gas entering the dilution box 6.

[0062] During specific implementation, during the process of treating the exhaust gas through the thermal oxidation furnace 1, the exhaust gas, fresh air and circulating gas respectively enter the dilution box 6 through the air guide mechanism 5 on the outer wall of the dilution box 6. During this process, the first filter 76, the second filter 78, the third filter 791, the fourth filter 794, the fifth filter 795 and the sixth filter 7993 of the separation mechanism 7 respectively filter the impurities in the exhaust gas, fresh air and circulating gas, thereby reducing the amount of impurities attached to the inner wall, flue and valve of the thermal oxidation furnace 1, avoiding affecting the flow and purification efficiency of the flue gas, and being able to separate the carbon dioxide in the circulating gas, reducing the concentration of carbon dioxide in the circulating gas, thereby reducing the space occupied by the carbon dioxide in the combustion chamber after the fresh air, exhaust gas and circulating gas are diluted, thereby avoiding reducing the proportion of oxygen and other combustible components, and avoiding the problem of incomplete combustion and affecting the combustion effect of the thermal oxidation furnace 1.

[0063] During the separation process, by rotating the ring body 72 back and forth a small distance, the first filter screen 76, the second filter screen 78, the third filter screen 791, the fourth filter screen 794, the fifth filter screen 795 and the sixth filter screen 7993 are conveniently cleaned, thereby continuing the separation. Moreover, by cooperating with the separation mechanism 7 and the air guide mechanism 5, the first filter screen 76, the second filter screen 78, the third filter screen 791, the fourth filter screen 794, the fifth filter screen 795 and the sixth filter screen 7993 are conveniently cleaned by backflushing, thereby further improving the cleaning effect and avoiding affecting the filtering effect during long-term filtration.

[0064] By integrating the air guide mechanism 5 into the outer wall of the dilution box 6, the separation mechanism 7 can simultaneously separate the circulating gas, exhaust gas and fresh air, and can also simultaneously clean them, so as to facilitate continuous separation and use. The separated gas enters the dilution mechanism 8, so as to facilitate subsequent dilution and use.

[0065] See also Figure 5 、 Figure 6 、 Figure 7 、 Figure 8 、 Figure 9 、 Figure 10 and 11 The separation mechanism 7 also includes a first sealing plate 74, a second sealing plate 79 and a third sealing plate 792 fixedly arranged on the top inner wall and the bottom inner wall of the annular groove 73. The first sealing plate 74, the second sealing plate 79 and the third sealing plate 792 are respectively arranged corresponding to the positions of the first filter screen 76, the second filter screen 78 and the third filter screen 791. There is a gap between the two first sealing plates 74, the two second sealing plates 79 and the two third sealing plates 792 to allow the gas to enter the dilution box 6 after separation. The top inner wall and the bottom inner wall of the annular groove 73 and on both sides of the first sealing plate 74 are respectively fixed with a fourth sealing plate 75 and a fifth sealing plate 77.

[0066] The separation mechanism 7 further comprises:

[0067] The sixth sealing plate 793 is fixed on the top inner wall and the bottom inner wall of the annular groove 73, and is located on the side of the third filter screen 791 away from the second filter screen 78. The sixth sealing plate 793 is fixedly connected to the third sealing plate 792 and the inner wall of the annular groove 73, and is designed to be sealed. The fourth sealing plate 75 and the fifth sealing plate 77 are both fixedly connected to the first sealing plate 74 and the inner wall of the annular groove 73, and are designed to be sealed. The side walls of the fourth sealing plate 75, the fifth sealing plate 77 and the sixth sealing plate 793 are provided with through grooves for sleeved ring body 72, so that the ring body 72 can rotate along the side walls of the fourth sealing plate 75, the fifth sealing plate 77 and the sixth sealing plate 793. The ring body 72 is concentrically arranged with the mounting ring 71, and a distance is left between the inner wall of the ring body 72 and the inner wall of the annular groove 73.

[0068] The inner sides of the two first sealing plates 74, the second sealing plates 79, and the third sealing plates 792, which are close to each other, are each provided with a notch, so that the outer sides of the two first sealing plates 74, the second sealing plates 79, and the third sealing plates 792, which are close to each other, can be fitted with the outer wall of the ring body 72. The notches of the first sealing plates 74, the second sealing plates 79, and the third sealing plates 792 are each fixed with sealing strips 796 arranged at intervals.

[0069] The inner walls of the side wall grooves of the fourth sealing plate 75, the fifth sealing plate 77 and the sixth sealing plate 793 are fixed with sealing rings 797 arranged at intervals to seal the connection between the ring body 72 and the fourth sealing plate 75, the fifth sealing plate 77 and the sixth sealing plate 793 while the ring body 72 rotates.

[0070] During specific implementation, the exhaust gas and fresh air are filtered through the second filter 78, the third filter 791, the fifth filter 795 and the sixth filter 7993 respectively, and the circulating gas is filtered through the first filter 76 and the fourth filter 794. During the separation process, the circulating gas, exhaust gas and fresh air are first filtered through the first filter 76, the second filter 78 and the third filter 791 respectively, and then filtered through the fourth filter 794, the fifth filter 795 and the sixth filter 7993 respectively, thereby improving the effect of separating impurities in the circulating gas, exhaust gas and fresh air.

[0071] The circulating gas is separated from the fresh air and the exhaust gas by the fourth sealing plate 75, the fifth sealing plate 77 and the sixth sealing plate 793, so that the circulating gas is filtered through the first filter 76 and the fourth filter 794 alone to prevent impurities in the exhaust gas from clogging the fourth filter 794, thereby avoiding affecting the filtering effect of carbon dioxide. The exhaust gas and the fresh air are separated in a connected environment by the fifth sealing plate 77 and the sixth sealing plate 793 to facilitate pre-dilution of the fresh air and the exhaust gas, thereby improving the dilution effect and avoiding excessive concentration of the exhaust gas to affect the separation effect.

[0072] The first filter 76, the second filter 78 and the third filter 791 are blocked by the first sealing plate 74, the second sealing plate 79, the third sealing plate 792, the fourth sealing plate 75, the fifth sealing plate 77 and the sixth sealing plate 793, so that the exhaust gas, the fresh air and the circulating gas can only pass through the second filter 78, the third filter 791 and the fourth filter 794 along the blocked space.

[0073] The fourth filter 794 uses a silicon carbide ceramic membrane to facilitate separation of carbon dioxide at high temperature.

[0074] The separation mechanism 7 further comprises:

[0075] The servo motor 798 is fixed on the outer wall of the dilution box 6 and is located at the bottom of the air intake pipe 4. The output shaft of the servo motor 798 is fixed with a rotating shaft extending into the dilution box 6 through a coupling. A gear is fixed on the side wall of one end of the rotating shaft located in the dilution box 6. The rotating shaft is rotatably connected to the dilution box 6. The bottom of the ring body 72 is provided with tooth grooves arranged in a circular array and meshing with the gear.

[0076] The separation mechanism 7 further comprises:

[0077] The first scrapers 7992 are fixed in an annular array on the inner wall of the dilution box 6 and fit in contact with the outer wall of the ring body 72. The inner wall of the arc-shaped groove is fixed with second scrapers 7991 arranged in an annular array. The second scrapers 7991 fit in contact with the inner wall of the ring body 72.

[0078] The third scraper 799 is fixed in a circular array on the inner wall of the ring body 72 and fits into the inner wall of the arc-shaped groove. The positions of the first scraper 7992, the second scraper 7991 and the third scraper 799 correspond to the positions of the first filter 76, the second filter 78 and the third filter 791.

[0079] In a specific implementation, the servo motor 798 drives the ring body 72 to rotate, thereby driving the first filter 76, the second filter 78 and the third filter 791 to rotate. During this process, the first scraper 7992 cleans the outside of the first filter 76, the second filter 78 and the third filter 791, the second scraper 7991 cleans the inside of the first filter 76, the second filter 78 and the third filter 791, and the third scraper 799 cleans the outside of the fourth filter 794, the fifth filter 795 and the sixth filter 7993, thereby facilitating the cleaning of filtered impurities and facilitating long-term separation and use.

[0080] When the ring body 72 is driven to rotate by the servo motor 798, the side wall of the ring body 72 is sealed by the sealing ring 797 and the sealing strip 796 to prevent air from flowing through.

[0081] When the servo motor 798 drives the ring body 72 to rotate for cleaning, the ring body 72 rotates back and forth, and the rotation distance is sufficient to clean the first filter 76, the second filter 78 and the third filter 791. Even if the ring body 72 first rotates in the direction of the third filter 791, the second filter 78 and the first filter 76, after cleaning is completed, it rotates in the opposite direction to prevent the second filter 78 from entering between the fourth sealing plate 75 and the fifth sealing plate 77 with the ring body 72. The ring body 72 is solid except for the first filter 76, the second filter 78 and the third filter 791 to avoid air cross-contamination.

[0082] See also Figure 15 、 Figure 16 、 Figure 17 and 18 , the air guide mechanism 5 includes:

[0083] The first air guide tubes 54 are fixedly mounted on the outer wall of the dilution box 6 in an annular array and extend to the inner side of the annular groove 73. The outer wall of the first air guide tubes 54 is fixedly provided with second connecting tubes 52, so that the first air guide tubes 54 are connected to the second air guide tubes 51 through the second connecting tubes 52. One of the second air guide tubes 51 is connected to the gas delivery pipe 3.

[0084] The lower tube body 53 is fixedly disposed at the bottom of the second connecting tube 52 and is in communication with the second connecting tube 52 and the first air guide tube 54 . The outer walls of the first air guide tube 54 and the second air guide tube 51 are both provided with valve bodies.

[0085] The gas guide mechanism 5 also includes:

[0086] The threaded rod 55 is threadedly connected to the outer wall of the second air duct 51 and extends into the second air duct 51. A connecting rod 56 is fixed to the bottom of the threaded rod 55. A blocking block 57 is fixed to the bottom of the connecting rod 56, and the bottom of the blocking block 57 is designed to be arc-shaped, so that when the blocking block 57 is at the top dead center, the bottom of the blocking block 57 is in contact with the top inner wall of the first air duct 54. When the blocking block 57 is at the bottom dead center, the entire blocking block 57 is located in the lower tube body 53, and the cross-section of the connecting rod 56 is designed to be elliptical.

[0087] In a specific implementation, the circulating gas, exhaust gas and fresh air all enter the dilution box 6 through the second air duct 51. At this time, the valve body on the outer wall of the first air duct 54 is closed to prevent gas from leaking out. When the first filter 76, the second filter 78 and the third filter 791 are backflushed, among which, when the first filter 76 and the fourth filter 794 are backflushed, the valve body on the outer wall of the second air duct 51 corresponding to the first filter 76 is closed, and the first air duct 54 is connected to the external sewage storage device. Then close the air guide mechanism 5 and the air intake pipe 4 corresponding to the exhaust gas, so that the fresh air enters the first air guide pipe 54 along the fourth filter 794 and the first filter 76 in turn, thereby backflushing the fourth filter 794 and the first filter 76, improving the cleaning effect and facilitating long-term separation and use. When it is necessary to backflush the second filter 78 and the fifth filter 795, close the second air guide pipe 51 corresponding to the second filter 78. According to the above steps, the second filter 78 and the fifth filter 795 can be backflushed.

[0088] During backflushing, the threaded rod 55 is rotated, causing the threaded rod 55 to rotate upward while driving the connecting rod 56 to move upward. When the threaded rod 55 is at the top dead center and cannot move further, the bottom of the blocking block 57 is in contact with the top inner wall of the first air duct 54 and is in a horizontally aligned state, thereby blocking the connection between the first air duct 54 and the second air duct 51, preventing impurities from accumulating at the connection between the first air duct 54 and the second air duct 51 during the backflushing process. Although the traditional valve body has the function of opening and closing, there is still space in the gap between the first air duct 54 and the second air duct 51, which can accumulate a lot of impurities. After the backflushing is completed, when the second air duct 51 delivers gas, the impurities are brought back to the first filter 76 and other places, affecting the backflushing effect and thus the actual separation effect. After the backflushing is completed, the threaded rod 55 is rotated to drive the connecting rod 56 and the blocking block 57 to move downward to the bottom dead center. At this time, the blocking block 57 is located in the lower tube 53, thereby preventing the second air duct 51 from affecting the gas delivery.

[0089] Example 2: Please refer to Figure 12 、 Figure 13 and Figure 14 The difference between this embodiment and the first embodiment is that the dilution mechanism 8 includes:

[0090] The box body 82 is fixedly mounted on the bottom inner wall of the dilution box 6. The inner wall of the box body 82 is fixedly provided with tubes 84 arranged in a circular array and extending to the outside of the box body 82.

[0091] The first connecting pipe 81 is fixedly arranged on the inner wall of the mounting ring 71 in a circular array, and is respectively sleeved on the outside of the fourth filter 794, the fifth filter 795 and the sixth filter 7993, so that the gas enters the first connecting pipe 81 after being separated by the fourth filter 794, the fifth filter 795 and the sixth filter 7993. The first connecting pipe 81 is fixedly connected to the end of the tube body 84 located outside the box body 82, and the end of the tube body 84 located inside the box body 82 is designed to be inclined so that the gas enters the box body 82 along the inclined angle.

[0092] The dilution mechanism 8 also includes:

[0093] The vortex blades 83 are rotatably arranged on the bottom inner wall and the top inner wall of the box body 82 so that the vortex blades 83 rotate under the action of the gas flowing along the inclined trajectory. The top of the box body 82 is provided with guide holes arranged in a circular array. The upper end of the box body 82 is designed in a frustum shape to limit the flow space of the gas entering the upper end of the box body 82. The air inlet end of the air inlet pipe 4 is fixedly connected to the top exhaust end of the box body 82 and is connected to each other. The outer wall of the air inlet pipe 4 is provided with a valve body.

[0094] During specific implementation, the separated gas enters the box body 82 at a certain angle through the connecting pipe and the pipe body 84, so that the exhaust gas, the circulating gas and the fresh air are mixed under the action of the vortex blades 83 for dilution. The gas mixed by the vortex blades 83 flows upward. By making the upper end of the box body 82 into a frustum shape, the space for gas flow is reduced to compress the gas, thereby further improving the effect of gas dilution. The diluted gas enters the thermal oxidation furnace 1 through the air inlet pipe 4 for combustion purification to reduce pollution to the atmosphere.

[0095] During the implementation of the present invention, in the process of treating the tail gas by the thermal oxidation furnace 1, the tail gas, fresh air and circulating gas respectively enter the dilution box 6 through the air guide mechanism 5 on the outer wall of the dilution box 6. During this process, the impurities in the tail gas, fresh air and circulating gas are filtered out respectively by the separation mechanism 7. During the subsequent combustion and separation process of the impurities, particles or crystals are easily attached to the inner wall, flue and valve of the thermal oxidation furnace 1 and deposited, causing the channel to be narrow or even completely blocked, affecting the flow of flue gas and the purification efficiency. In addition, the carbon dioxide in the circulating gas can be separated to reduce the concentration of carbon dioxide in the circulating gas, thereby reducing the space occupied by the carbon dioxide in the combustion chamber after the fresh air, tail gas and circulating gas are diluted, thereby avoiding the reduction of the proportion of oxygen and other combustible components, and avoiding the problem of incomplete combustion and affecting the combustion effect of the thermal oxidation furnace 1.

[0096] The separated fresh air, exhaust gas, and circulating gas are diluted by dilution mechanism 8 to fully mix the fresh air, exhaust gas, and circulating gas, thereby facilitating their complete combustion. The diluted gas enters thermal oxidizer 1 along intake pipe 4 and is burned in thermal oxidizer 1. The high-temperature incineration oxidizes the organic matter in the exhaust gas into carbon dioxide and water vapor. The burned gas is discharged through exhaust pipe 2 to reduce atmospheric pollution. Part of the gas enters air guide mechanism 5 through gas pipe 3 and is diluted with fresh air for circulating combustion. By introducing the purified exhaust gas from thermal oxidizer 1 as circulating gas and mixing it with the original exhaust gas, precise dilution is achieved, effectively reducing the concentration of organic matter in the exhaust gas and avoiding safety hazards such as unstable operation of thermal oxidizer 1 due to excessive concentration. At the same time, the waste heat of the circulating gas is used to preheat the intake air, improving the thermal efficiency of the system and reducing energy consumption.

[0097] Meanwhile, the contents not described in detail in this specification belong to the prior art known to those skilled in the art.

[0098] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0099] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A low-temperature methanol-washed tail gas thermal storage oxidation flue gas recirculation coupling device, comprising a thermal oxidation furnace, an air intake pipe and an exhaust pipe fixedly arranged at the air intake end and the exhaust end of the thermal oxidation furnace, characterized in that: The dilution box further includes a dilution box, an air guide mechanism arranged in a ring array around the dilution box, and an air delivery pipe for connecting the exhaust pipe and one of the air guide mechanisms. The inner wall of the dilution box is provided with a separation mechanism for separating the gas entering the dilution box. The bottom inner wall of the dilution box is provided with a dilution mechanism for diluting the gas separated by the separation mechanism. The separation mechanism includes: The mounting ring is fixedly mounted on the inner wall of the dilution box, and an annular groove is formed on the outer wall of the mounting ring; The ring body is sleeved on the inner side of the annular groove, and the outer wall of the ring body is embedded with a first filter screen, a second filter screen, and a third filter screen arranged in an annular array. The inner wall of the annular groove is fixed with a fourth filter screen, a fifth filter screen, and a sixth filter screen arranged corresponding to the first filter screen, the second filter screen, and the third filter screen, respectively, to separate the gas entering the dilution box; The air guide mechanism comprises: The first air ducts are fixedly mounted on the outer wall of the dilution box in an annular array and extend to the inner side of the annular groove. The outer wall of the first air ducts is fixedly provided with second connecting pipes, so that the first air ducts are connected to the second air ducts via the second connecting pipes, and one of the second air ducts is connected to the gas delivery pipe; The lower tube body is fixedly arranged at the bottom of the second connecting tube and is in communication with the second connecting tube and the first air guide tube. The outer walls of the first air guide tube and the second air guide tube are both provided with valve bodies. The air guide mechanism further comprises: A threaded rod is threadedly connected to the outer wall of the second air duct and extends into the second air duct. A connecting rod is fixedly provided at the bottom of the threaded rod. A blocking block is fixedly provided at the bottom of the connecting rod, and the bottom of the blocking block is designed to be arc-shaped so that when the blocking block is at the top dead center, the bottom of the blocking block fits with the top inner wall of the first air duct. When the blocking block is at the bottom dead center, the entire blocking block is located in the lower tube body, and the cross-section of the connecting rod is designed to be elliptical.

2. A low-temperature methanol tail gas washing thermal storage oxidation flue gas recirculation coupling device according to claim 1, characterized in that: The separation mechanism also includes a first sealing plate, a second sealing plate and a third sealing plate fixedly arranged on the top inner wall and the bottom inner wall of the annular groove. The first sealing plate, the second sealing plate and the third sealing plate are respectively arranged corresponding to the positions of the first filter screen, the second filter screen and the third filter screen. There is a gap between the two first sealing plates, the two second sealing plates and the two third sealing plates to allow the gas to enter the dilution box after separation. The top inner wall and the bottom inner wall of the annular groove and on both sides of the first sealing plate are respectively fixed with a fourth sealing plate and a fifth sealing plate.

3. The low-temperature methanol-washed tail gas thermal storage oxidation flue gas recirculation coupling device according to claim 2 is characterized in that: The separation mechanism further comprises: The sixth sealing plate is fixedly arranged on the top inner wall and the bottom inner wall of the annular groove, and is located on the side of the third filter screen away from the second filter screen. The sixth sealing plate is fixedly connected to the third sealing plate and the inner wall of the annular groove, and is designed to be sealed. The fourth sealing plate and the fifth sealing plate are fixedly connected to the first sealing plate and the inner wall of the annular groove, and are designed to be sealed. The side walls of the fourth sealing plate, the fifth sealing plate and the sixth sealing plate are provided with through grooves for sleeved ring bodies, so that the ring bodies can rotate along the side walls of the fourth sealing plate, the fifth sealing plate and the sixth sealing plate. The ring body is concentrically arranged with the mounting ring, and a distance is left between the inner wall of the ring body and the inner wall of the annular groove.

4. A low-temperature methanol-washed tail gas thermal storage oxidation flue gas recirculation coupling device according to claim 3, characterized in that: The inner sides of the two first sealing plates, the second sealing plates and the third sealing plates close to each other are each provided with a notch, so that the outer sides of the two first sealing plates, the second sealing plates and the third sealing plates close to each other are in contact with the outer wall of the ring body, and the notches of the first sealing plates, the second sealing plates and the third sealing plates are each fixed with sealing strips arranged at intervals; The inner walls of the side wall grooves of the fourth sealing plate, the fifth sealing plate and the sixth sealing plate are fixed with sealing rings arranged at intervals to seal the connection between the ring body and the fourth sealing plate, the fifth sealing plate and the sixth sealing plate when the ring body rotates.

5. The low-temperature methanol tail gas washing thermal storage oxidation flue gas recirculation coupling device according to claim 1 is characterized in that: The separation mechanism further comprises: The servo motor is fixed on the outer wall of the dilution box and is located at the bottom of the air intake pipe. The output shaft of the servo motor is fixed with a rotating shaft extending into the dilution box through a coupling. A gear is fixed on the side wall of one end of the rotating shaft located in the dilution box. The rotating shaft is rotatably connected to the dilution box. The bottom of the ring body is provided with tooth grooves arranged in a circular array and meshing with the gear.

6. The low-temperature methanol tail gas washing thermal storage oxidation flue gas recirculation coupling device according to claim 1 is characterized in that: The separation mechanism further comprises: The first scraper is fixed in an annular array on the inner wall of the dilution box and fits with the outer wall of the ring body. The inner wall of the arc-shaped groove is fixed with a second scraper arranged in an annular array, and the second scraper fits with the inner wall of the ring body. The third scraper is fixed on the inner wall of the ring body in an annular array and fits with the inner wall of the arc-shaped groove. The positions of the first scraper, the second scraper and the third scraper correspond to the positions of the first filter screen, the second filter screen and the third filter screen.

7. The low-temperature methanol tail gas washing thermal storage oxidation flue gas recirculation coupling device according to claim 1 is characterized in that: The dilution mechanism comprises: The box body is fixedly arranged on the bottom inner wall of the dilution box, and the inner wall of the box body is fixedly provided with tubes arranged in a circular array and extending to the outside of the box; The first connecting pipe is fixedly arranged on the inner wall of the mounting ring in a circular array, and is respectively sleeved on the outside of the fourth filter, the fifth filter and the sixth filter, so that the gas enters the first connecting pipe after being separated by the fourth filter, the fifth filter and the sixth filter. The first connecting pipe is fixedly connected to the end of the tube body located outside the box, and the end of the tube body located inside the box is designed to be inclined so that the gas enters the box along the inclined angle.

8. The low-temperature methanol tail gas washing thermal storage oxidation flue gas recirculation coupling device according to claim 7 is characterized in that: The dilution mechanism further comprises: The vortex blades are rotatably arranged on the bottom inner wall and the top inner wall of the box body so that the vortex blades rotate under the action of the gas flowing along the inclined trajectory. The top of the box body is provided with guide holes arranged in a circular array. The upper end of the box body is designed in a frustum shape to limit the flow space of the gas entering the upper end of the box body. The air inlet end of the intake pipe is fixedly connected to the top exhaust end of the box body and is connected to each other. The outer wall of the intake pipe is provided with a valve body.

Images