Waste gas treatment device after nitrogen oxide catalytic oxidation reaction

Abstract

The invention discloses a waste gas treatment device after a nitrogen oxide catalytic oxidation reaction, and relates to the technical field of filter bag dust removers, the waste gas treatment device comprises a dust removal box and a purification cavity, and comprises a first chamber and a second chamber which are arranged in the dust removal box and are separated from each other; the filter bag assembly is arranged in the dust removal box and comprises an inner filter cylinder and an outer filter bag which is arranged around the inner filter cylinder and encloses a light dust storage area. According to the waste gas treatment device after the catalytic oxidation reaction of the nitrogen oxides, the two chambers are alternately purified through the arrangement of the three-way valve, and the other chamber is started when dust of the filter bag assembly needs to be cleaned in one chamber, so that the time for waiting for settlement is shortened. By arranging the filter bag assembly, light dust and heavy dust are separated, the heavy dust is shaken off and the light dust is compressed by folding the outer filter bag, the light dust is helped to agglomerate, the content of the light dust floating in the chamber is reduced, and the settling rate of the dust is increased.

Description

Technical Field

[0001] The invention relates to the technical field of filter bag dust collectors, and in particular to a waste gas treatment device after a catalytic oxidation reaction of nitrogen oxides. Background Art

[0002] In factory emissions, especially in high-emission industries such as thermal power plants, chemical plants, and steel mills, a large amount of nitrogen oxides are produced by burning fossil fuels. In order to avoid direct emissions into the atmosphere and cause serious air pollution, catalytic oxidation reactions are generally used to convert NO into NO2 for subsequent treatment. The treated exhaust gas is then passed through a bag filter to remove dust and is discharged into the air after meeting the standards.

[0003] In conjunction with publication number CN113546481A, on the publication date, a bag-type dust collector filter bag was disclosed, comprising a bag body, a frame and a connector mounted in conjunction with the bag body; the connector is arranged on the top of the frame; a plurality of annular positioning hooks are arranged on the top of the bag body; a plurality of groups of vertically arranged shaping wires and annular drawstrings are arranged inside the bag body; a counterweight is arranged on the shaping wire; a vertical air duct is arranged inside the bag body; a plurality of groups of interconnected conduits are arranged on the air duct, and the other end of the conduit is connected to the bag body; the conduit comprises an elastic part and a connecting part; the elastic part is extended and retracted left and right along the horizontal direction; a limiting block is arranged inside the connecting part, and an inner lining layer is arranged on the inner wall of the connecting part; an active ball is arranged inside the connecting part, and the active ball slides along the inner lining layer. The above-mentioned technology can hit the bag body through the counterweight during spray cleaning, thereby increasing the movement range of the bag body and improving the cleaning effect, and combined with the nozzle to spray air to the air duct, the gas in the connecting part is discharged through the air vent, and the bag body expands rapidly in a short time.

[0004] However, in the prior art including the above-mentioned patents, since the exhaust gas is burned at high temperature, the light dust particles therein have a higher temperature and a lower density, and the volume of the particles expands, similar to a small "hot air balloon". The dust is sucked by the filter bag opening and adheres to the outer wall of the filter bag. Among them, the heavy dust is more likely to agglomerate and further increase its own weight due to its greater density, but the nuclei of the light dust still maintain a distance due to the volume expansion, making it difficult for the light dust to agglomerate. When a counterweight is used to hit the bag body, the agglomerated heavy dust is shaken off and settles, while the light dust floats in the filter bag dust collector under the effect of thermal buoyancy. Since the filter bag dust collector is always kept at a high temperature due to the waste heat of the exhaust, the thermal buoyancy always exists, making it difficult to make the light dust fall quickly by sedimentation.

[0005] When the pulse jet pipe matched with the filter bag is spraying, the gas will spread around along the surface of the filter bag. Light dust will remain suspended after being blown away, but heavy dust that has settled may float again under the blowing of the airflow, which will weaken the concentration drop of floating dust in the filter bag dust collector and reduce the actual amount of dust removed by sedimentation. When the filter bag dust collector continues to discharge exhaust gas, the floating dust in the filter bag dust collector will gradually increase, making the filter bag more and more easily covered by dust. The frequency of pulse jet needs to be gradually increased, and the number of sedimentation cleaning times increases, making the waiting time for sedimentation longer. Summary of the invention

[0006] The object of the present invention is to provide an exhaust gas treatment device after the catalytic oxidation reaction of nitrogen oxides, so as to solve the above-mentioned problems.

[0007] In order to achieve the above-mentioned object, the present invention provides the following technical solutions: an exhaust gas treatment device after a catalytic oxidation reaction of nitrogen oxides, comprising a dust removal box and a purification chamber, comprising a first chamber and a second chamber which are opened in the dust removal box and separated from each other, and an air inlet pipe which alternately feeds air into the first chamber and the second chamber, on which a three-way valve switched by program control is arranged; The filter bag assembly is arranged in the dust removal box, and includes an inner filter cartridge and an outer filter bag arranged around the inner filter cartridge to enclose a light dust storage area, and an intermittently open movable bottom plate is installed at the bottom of the light dust storage area; The outer filter bag is in a folded state in the axial direction; The movable port is fixedly arranged at the port of the outer filter bag and is driven to move in the vertical direction.

[0008] Preferably, a folding assembly for supporting the outer filter bag is further included, which includes a first folding rod and a second folding rod hinged to each other, and a sliding piece sliding along the outer wall of the inner filter cartridge is provided at the connection position of each folding assembly.

[0009] Preferably, the first folding rod and the second folding rod form an acute angle structure obliquely downward when in a folded state.

[0010] Preferably, a rotating wheel is rotatably provided on the slide and rotates as the folding assembly unfolds.

[0011] Preferably, it also includes keels arranged in a circumferential array on the inner filter cartridge.

[0012] Preferably, it also includes a rotating member which is rotatably arranged relative to the inner filter cartridge and forms a blocking fit with the movable opening, and the rotating member and the movable bottom plate keep synchronous movement.

[0013] Preferably, it further comprises a hook-shaped portion, on which a first spring for maintaining a predetermined height is arranged, and the rotating member has a station in its movable stroke for engaging with the hook-shaped portion.

[0014] Preferably, the invention further comprises a transmission rod slidably arranged in a vertical direction, and the hook-shaped portion is fixedly arranged at the end of the transmission rod.

[0015] Preferably, it also includes an inclined block which slides radially along the port of the inner filter cartridge and is used for clamping the movable port.

[0016] Preferably, the inclined block and the transmission rod move synchronously. In the above technical scheme, the exhaust gas treatment device after the catalytic oxidation reaction of nitrogen oxides provided by the present invention has the following beneficial effects: the two chambers are alternately purified by the setting of the three-way valve, and when one chamber needs to clean the dust of the filter bag assembly, the other chamber is started, which reduces the time required to wait for the end of sedimentation. And through the setting of the filter bag assembly, the light and heavy dust are separated, and the heavy dust is shaken off and the light dust is compressed by the folding of the outer filter bag, which helps the light dust to agglomerate, reduces the content of light dust floating in the chamber, and improves the dust sedimentation rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present application 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 recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0018] Figure 1 An overall three-dimensional schematic diagram provided for an embodiment of the present invention; Figure 2 A schematic diagram of the overall length-direction cross-section structure provided by an embodiment of the present invention; Figure 3 A schematic diagram of the overall three-dimensional rear structure provided by an embodiment of the present invention; Figure 4 A schematic diagram of the overall width-direction cross-sectional structure provided by an embodiment of the present invention; Figure 5 A schematic diagram of the structure of the filter bag assembly in a default state provided by an embodiment of the present invention; Figure 6 A schematic diagram of the structure of a filter bag assembly in a folded state provided by an embodiment of the present invention; Figure 7 A schematic diagram of the keel and movable opening structure provided in an embodiment of the present invention; Figure 8 A schematic diagram of the structure of the keel and folding assembly provided in an embodiment of the present invention; Fig. 9 A schematic diagram of a keel structure provided by an embodiment of the present invention; Fig.10A schematic diagram of the structure of the keel, inner filter cartridge and movable port provided in an embodiment of the present invention; Fig.11 A schematic diagram of the first folding rod, the second folding rod and the sliding member structure provided by an embodiment of the present invention. Description of reference numerals: 1. dust box; 11. first chamber; 12. second chamber; 13. purification chamber; 14. fixed partition; 15. movable plate; 16. drive unit; 2. air inlet pipe; 21. side pipe; 3. three-way valve; 4. lower ash hopper; 5. filter bag assembly; 51. inner filter cartridge; 52. fixed port; 521. keel; 53. movable port; 531. slot; 54. first folding rod; 55. second folding rod; 56. sliding member; 561. scraper; 562. ratchet; 563. rotating wheel; 564. elastic member; 57. outer filter bag; 58. support frame; 581. first spring; 582. transmission rod; 583. hook; 584. rotating member; 585. second spring; 586. slide rail; 587. inclined block; 59. movable bottom plate; 591. movable rod. DETAILED DESCRIPTION

[0019] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0020] like Figure 1-Figure 11 As shown, an exhaust gas treatment device after catalytic oxidation reaction of nitrogen oxides includes a dust removal box 1 and a purification chamber 13, including a first chamber 11 and a second chamber 12 opened in the dust removal box 1 and separated from each other, and an air inlet pipe 2 alternately feeding air into the first chamber 11 and the second chamber 12, on which a three-way valve 3 switched by program control is arranged; The filter bag assembly 5 disposed in the dust removal box 1 includes an inner filter cartridge 51 and an outer filter bag 57 disposed around the inner filter cartridge 51 to enclose a light dust storage area, and an intermittently open movable bottom plate 59 is installed at the bottom of the light dust storage area; The outer filter bag 57 has a folded state in the axial direction; The movable port 53 fixedly arranged at the end of the outer filter bag 57 is driven to move in the vertical direction.

[0021] Specifically, it also includes an outlet connected to the purification chamber 13 to discharge the purified gas to the outside, and the first chamber 11 is fixedly connected with a side pipe 21. One port of the three-way valve 3 is connected to the air inlet pipe 2, and the other two ports are respectively connected to the side pipe 21 and the second chamber 12. It also includes an injection unit for performing pulse injection at the center of the filter bag assembly 5. The above structures are all technical attempts known to those skilled in the art and will not be described in detail here.

[0022] The three-way valve 3 can be preset with a timing program for switching at a fixed time (such as one day, one week, etc., which is determined according to the actual situation), so that the exhaust gas in the air inlet pipe 2 is discharged to the first chamber 11 or the second chamber 12, and the exhaust to the other chamber is stopped. The gas is only purified by the filter bag assembly 5 in the first chamber 11 or the second chamber 12 and then discharged through the purification chamber 13; or according to the gas flow detection at the gas outlet, when the gas flow is lower than the threshold, it means that the filter bag assembly 5 in the currently running chamber is blocked by dust, and then the three-way valve 3 is controlled by the program to switch to another chamber, and the purification is carried out through the filter bag assembly 5 that is not blocked, or other system control methods known to those skilled in the art are all possible. The two chambers take turns to purify the exhaust gas, and when one of the chambers needs to clean the dust of the filter bag assembly 5, the other chamber is started, which reduces the time required to wait for the end of sedimentation when there is only one chamber.

[0023] Furthermore, movable plates 15 are slidably provided in the first chamber 11 and the second chamber 12, respectively, and a driving unit 16 movable in the vertical direction is provided in the dust removal box 1. The movable plate 15 and the driving unit 16 are fixedly welded, and a plurality of movable ports 53 are all engaged with the movable plate 15. A fixed partition 14 is fixedly provided in the dust removal box 1 to separate the purification chamber 13. The port of the inner filter cartridge 51 is engaged with the fixed partition 14, and the purified gas enters the purification chamber 13 through the inner filter cartridge 51. In the default state, the movable plate 15 is located at the highest point, that is, close to the port position of the inner filter cartridge 51. At this time, the outer filter bag 57 is unfolded in the axial direction and sleeved on the outside of the inner filter cartridge 51. The bottom of the outer filter bag 57 is fixedly connected to the bottom of the inner filter cartridge 51, as shown in FIG. Figure 5 As shown. Since the filter holes of the outer filter bag 57 are larger than the filter holes of the inner filter cartridge 51, when the exhaust gas passes through the filter bag assembly 5, the heavy dust therein is intercepted outside the outer filter bag 57 due to its larger particles, while the light dust enters the outer filter bag 57 and is finally intercepted by the inner filter cartridge 51. At this time, the area between the outer filter bag 57 and the inner filter cartridge 51 is the light dust storage area, which separates the light and heavy dust.

[0024] When the air intake in the chamber stops, the movable plate 15 is first driven to move downward in the vertical direction by the driving unit 16 such as a linear motor or an electric telescopic rod, and the distance between the movable plate 15 and the port of the inner filter cartridge 51 increases, and the movable port 53 of the outer filter bag 57 moves downward, so that the outer filter bag 57 is squeezed in the axial direction and folded. The structure of the outer filter bag 57 can be set in an annular corrugated tube shape, or a Z-shaped fold is preset on the outer filter bag 57 to achieve the folding of the outer filter bag 57. During the folding process, the dust in the light dust storage area is compressed by the inner wall of the outer filter bag 57, so that the air between the light dust cores is squeezed out, the distance between the dust cores is shortened, the density is increased, and the light dust is agglomerated and agglomerated by pressure. At the same time, during the folding process of the outer filter bag 57, the heavy dust intercepted on the outer wall is shaken off and automatically settled.

[0025] The movable bottom plate 59 is symmetrically arranged at the bottom of the light dust storage area, and the movable bottom plate 59 is a semicircular ring structure rotatably arranged between the outer filter bag 57 and the inner filter cartridge 51. Figure 7 As shown. The two movable bottom plates 59 are hinged to each other, and in the default state, the two movable bottom plates 59 form a right angle. Then, the movable bottom plate 59 is opened, and a driving motor can be provided, and the output shaft of the driving motor outputs torque to drive the movable bottom plate 59 to rotate, so that the movable bottom plate 59 is opened; or electromagnets that attract each other are provided on the movable bottom plate 59, and the electromagnets are energized to make the movable bottom plates 59 approach each other and open, at which time the agglomerated light dust falls due to its own weight, and falls together with the heavy dust outside the outer filter bag 57, which can effectively reduce the problem of continuous floating of light dust.

[0026] Then, the movable plate 15 is driven to move upward and reset to a position close to the port of the inner filter cartridge 51 , and the outer filter bag 57 is restored to the unfolded state, while the movable bottom plate 59 is kept open.

[0027] Finally, the jet is sprayed through the jet unit. Since the nozzle is located in the middle of the filter bag assembly 5, that is, at the axis of the inner filter cartridge 51, the ejected gas diffuses along the outer wall of the inner filter cartridge 51, and the impact force of the airflow is weakened. The weakened airflow will be blocked by the inner wall of the outer filter bag 57, and form a flow direction from top to bottom under the guidance of the inner wall, blowing the residual dust in the light dust storage area downward, accelerating the sedimentation of light dust. After the jet is completed, the movable bottom plate 59 is driven to close and return to the default state.

[0028] In the above technology, the two chambers are alternately purified by setting the three-way valve 3. When one chamber needs to clean the dust of the filter bag assembly 5, the other chamber is started, which reduces the time required to wait for the sedimentation to end. And through the setting of the filter bag assembly 5, the light and heavy dust are separated, and the heavy dust is shaken off and the light dust is compressed by folding the outer filter bag 57, which helps the light dust to agglomerate, reduces the content of light dust floating in the chamber, and improves the sedimentation rate of the dust.

[0029] As an embodiment further provided by the present invention, it also includes a folding assembly for supporting the outer filter bag 57, which includes a first folding rod 54 and a second folding rod 55 hinged to each other, and a sliding member 56 sliding along the outer wall of the inner filter cylinder 51 is provided at the connection position of each folding assembly.

[0030] Specifically, the first folding rod 54 and the second folding rod 55 form a group of folding components, and the two groups of folding components are rotatably connected to each other, and the slide 56 is rotatably arranged at the connecting shaft of the first folding rod 54 and the second folding rod 55, that is, each group of folding components has a slide 56 above and below. The first folding rod 54 at the top is rotatably connected to the movable opening 53, and the second folding rod 55 at the bottom is rotatably connected to the bottom of the outer filter bag 57, as shown in FIG. Figure 5and Figure 6 As shown. When the movable opening 53 moves downward from the default state, the slide 56 slides vertically on the outer wall of the inner filter cartridge 51, so that each group of folding components is constrained by the slide 56 and folds in a specified direction, and the angle between the first folding rod 54 and the second folding rod 55 decreases. The outer filter bag 57 is wrapped around the periphery of the folding component and folds as the angle between the first folding rod 54 and the second folding rod 55 decreases, as shown. Figure 6 shown.

[0031] A scraper 561 made of rubber is arranged between the slides 56, and the scraper 561 is a hollow structure. The inner wall of the outer filter bag 57 is fixedly glued to the scraper 561, so that when the folding assembly is folded, the outer filter bag 57 is driven to fold and deform, and the outer filter bag 57 has folds. When the folding assembly is folded, the outer filter bag 57 is radially expanded, but the existence of the folds prevents the aperture of the filter from changing.

[0032] When the movable opening 53 moves downward, each group of folding components folds and causes the slide 56 to move downward. The slide 56 drives the scraper 561 to slide down along the outer wall of the inner filter cartridge 51 and scrape the outer wall of the inner filter cartridge 51 to scrape off the adsorbed light dust. Since the inner filter cartridge 51 is generally made of polyester fiber, static electricity is generated when the inner filter cartridge 51 scrapes against the rubber scraper 561. The static electricity causes the light dust to adhere more to the scraper 561, and the light dust is squeezed by scraping, which has a compression effect and falls downward through the hollow structure.

[0033] Even if the light dust floats in the light dust storage area after being scraped off, it will be squeezed by the inner wall of the outer filter bag 57 due to the folding of the outer filter bag 57. At this time, the outer filter bag 57 blocks the larger filter holes due to the heavy dust adsorbed on the surface, preventing the light dust from floating out directly, thereby further improving the cleaning and agglomeration effect of the light dust.

[0034] As another embodiment further provided by the present invention, the first folding rod 54 and the second folding rod 55 form an acute angle structure obliquely downward when folded.

[0035] Specifically, the length of the second folding rod 55 is shorter than that of the first folding rod 54. When the movable opening 53 moves downward, the two ends of the folding assembly are brought closer to each other, and the angle between the first folding rod 54 and the second folding rod 55 is reduced. Since the second folding rod 55 is shorter, the first folding rod 54 gradually swings from the outer circumference of the circle to the center of the circle. At this time, the angle between the first folding rod 54 and the second folding rod 55 is as follows: Figure 6 Status shown.

[0036] The tip of the angle is slanted downward, and the outer filter bag 57 is divided into an upper side and a lower side by the angle, wherein the heavy dust on the upper side is driven by the swing and automatically rolls down along the inclined surface, while the heavy dust on the lower side swings with the second folding rod 55, and the swing angle is large, which can make the heavy dust on the lower side automatically roll down to the upper side of the next group. Some of the heavy dust that adheres does not roll down and is blocked on the filter hole. This part of the heavy dust is squeezed and agglomerated as the angle between the lower side plate and the upper side becomes smaller. After the folding assembly is unfolded, the upper side and the lower side swing again and shake off the heavy dust.

[0037] However, there is a problem in the above technical solution, that is, during the exhaust process, the temperature of the exhaust gas is relatively high, while the inside of the filter bag assembly 5 is connected to the outside air, the temperature inside the filter bag assembly 5 is relatively low and has more or less moisture according to the humidity on site. When the high-temperature exhaust gas first contacts the outer filter bag 57, the moisture contained in the outer filter bag 57 will liquefy under the contact of the cold and hot air flow, and condensation will be generated on the inner wall of the outer filter bag 57 and absorb light dust, so that the light dust sticks to the outer filter bag 57. This part of the light dust is not scraped by the scraper 561, which will cause the outer filter bag 57 to be blocked.

[0038] As an embodiment further provided by the present invention to solve the above-mentioned problem, a rotating wheel 563 is rotatably provided on the sliding member 56 and rotates along with the unfolding of the folding assembly.

[0039] Specifically, Fig.11 As shown for reference, ratchets 562 are fixedly arranged on both sides of the top of the second folding rod 55, and the bottom of the first folding rod 54 is rotatably arranged between the two ratchets 562, the slide 56 remains vertically movable, the ratchets 562 rotate relative to the slide 56, and a plurality of elastic members 564 are fixedly arranged in a circumferential array on the rotating wheel 563. The elastic member 564 has a tip and an opposite tail end, and when the folding assembly is folded, the elastic member 564 is arranged to rotate relative to the first folding rod 54. Fig.11 The direction shown is for reference. At this time, the second folding rod 55 is swung upward relative to the slide 56, that is, it rotates clockwise, that is, the ratchet 562 rotates clockwise relative to the slide 56. At this time, the ratchet teeth of the ratchet 562 are turned in the same direction as the tip of the elastic member 564. The ratchet teeth are weakly blocked by the elastic member 564, and the ratchet 562 will not drive the rotating wheel 563 to rotate. When the folding assembly is folded, the rotating wheel 563 does not move, avoiding knocking on the heavy dust on the outer filter bag 57, so that part of the heavy dust stays on the outer filter bag 57 to block the filter holes, preventing light dust from floating out.

[0040] When the folding assembly is unfolded, the second folding rod 55 swings downward relative to the sliding member 56 and rotates counterclockwise. At this time, the ratchet 562 rotates counterclockwise, and the ratchet teeth abut against the tip of the elastic member 564, so that the tail end of the elastic member 564 is under pressure and swings. The tail ends of multiple elastic members 564 extend out of the rotating wheel 563, and when the ratchet 562 rotates, the rotating wheel 563 is driven to rotate by pushing the elastic member 564. The rear end of the rotating wheel 563 and the extended elastic member 564 rotate and abut against the inner wall of the outer filter bag 57. The rear end knocks and vibrates the inner wall of the outer filter bag 57 multiple times, thereby promoting the light dust adhering to the inner wall to fall off.

[0041] As another embodiment further provided by the present invention, it also includes keels 521 arranged in a circumferential array on the inner filter cartridge 51.

[0042] Specifically, the keel 521 is provided with a rectangular opening, through which the inner filter cartridge 51 is inserted into the keel 521 and supported by the keel 521 to be shaped, so that the inner filter cartridge 51 can be a hard filter material or a soft bag cartridge. Figure 7 and Figure 8 As shown in the structure, a fixed opening 52 is provided at the top of the keel 521 . In a default state, the movable opening 53 is close to the port of the inner filter cartridge 51 and is closely attached to the bottom side of the fixed opening 52 .

[0043] As another embodiment further provided by the present invention, it also includes a rotating member 584 which is rotatably arranged relative to the inner filter cartridge 51 and forms a blocking fit with the movable opening 53 , and the rotating member 584 and the movable bottom plate 59 keep synchronous movement.

[0044] Specifically, it also includes a support frame 58 disposed in the keel 521, and the support frame 58 is located between the outer filter bag 57 and the inner filter cartridge 51. The rotating member 584 is rotatably disposed on the support frame 58, and the rotating member 584 is symmetrically and fixedly provided with a slide rail 586 about the center of the rotating axis. Figure 7 The two movable bottom plates 59 are fixed with protruding blocks, and also include movable rods 591 slidably arranged on both sides of the support frame 58, wherein the bottom ends of the movable rods 591 move in the protruding blocks, and the top ends of the movable rods 591 are slidably arranged in the slide rails 586.

[0045] A second spring 585 for maintaining a fixed angle is provided on the rotating member 584. When the movable opening 53 moves downward, the movable opening 53 will push the rotating member 584 downward, so that the rotating member 584 rotates clockwise until it is offset from the movable opening 53, and then the rotating member 584 is located above the movable opening 53 and will not interfere with the downward movement of the movable opening 53. At this time, the upward swing amplitude of the slide rail 586 is small, and it drives the top of the movable rod 591 to move slightly upward, so the bottom end of the movable rod 591 pulls the protruding block upward to a small extent, and the movable bottom plate 59 remains in a closed state. When the movable opening 53 moves upward, it will push the rotating member 584 upward, causing the rotating member 584 to rotate counterclockwise and drive the slide rail 586 to rotate counterclockwise, and the slide rail 586 will push the top of the movable rod 591 to move downward, so that the bottom end of the movable rod 591 moves downward for a distance and then pushes the movable bottom plate 59. During the pushing process, the bottom end of the movable rod 591 is always in the raised block, so that the movable bottom plate 59 is open.

[0046] After the movable opening 53 moves upward for a period of time, it is offset from the rotating member 584. The rotating member 584 is pulled back to a fixed angle by the second spring 585. The slide rail 586 swings clockwise and pulls the movable bottom plate 59 through the movable rod 591, so that the movable bottom plate 59 is closed again.

[0047] As another embodiment further provided by the present invention, it also includes a hook-shaped portion 583 on which a first spring 581 for maintaining a predetermined height is disposed, and the rotating member 584 has a station in its movable stroke for engaging with the hook-shaped portion 583 .

[0048] Specifically, the hook portion 583 is slidably disposed on the support frame 58. The hook portion 583 has an inclined surface, and a cylinder corresponding to the hook portion 583 is fixedly disposed inside the rotating member 584. When the movable opening 53 moves upward, it will push the rotating member 584 upward, causing the rotating member 584 to rotate counterclockwise, and drive the cylinder to rotate counterclockwise to the inclined surface, and the hook portion 583 moves downward through the compression of the cylinder on the inclined surface, and the first spring 581 is compressed and accumulates force. After the cylinder is separated from the inclined surface, the cylinder falls into the hook portion 583, at which time the accumulated force of the first spring 581 is released and drives the hook portion 583 to clamp the rotating member 584, and pushes the top end of the movable rod 591 downward through the slide rail 586, so that the bottom end of the movable rod 591 moves downward for a distance and then pushes the movable bottom plate 59, so that the movable bottom plate 59 remains in an open state.

[0049] As another embodiment further provided by the present invention, it also includes a transmission rod 582 slidably arranged in the vertical direction, and the hook portion 583 is fixedly arranged at the end of the transmission rod 582.

[0050] Specifically, it also includes an inclined block 587 that slides radially along the port of the inner filter cartridge 51, which is used to clamp the movable port 53, and the inclined block 587 and the transmission rod 582 keep synchronous movement. The transmission rod 582 is slidably arranged on the support frame 58, and the inclined block 587 is slidably matched with the first end of the transmission rod 582, such as Fig.10 As shown, a locking groove 531 is provided on the movable opening 53 , and an inclined guiding surface exists between the top surface of the movable opening 53 and the locking groove 531 .

[0051] During the upward movement of the movable port 53, the guide surface first contacts the inclined block 587, and the inclined block 587 is pushed by the guide surface and radially approaches the axis of the port of the inner filter cartridge 51, so that the inclined block 587 squeezes the first end of the transmission rod 582, and the transmission rod 582 slides downward and causes the hook 583 at the second end to move downward synchronously, and the first spring 581 is compressed. In addition, the hook 583 is staggered with the cylinder on the rotating member 584, and the rotating member 584 is pulled clockwise by the second spring 585 after being separated from the hook 583, and the movable bottom plate 59 is lifted by the movable rod 591, so that the movable bottom plate 59 is restored to be closed.

[0052] At the same time, the inclined block 587 slides into the slot 531 along the guide surface. After losing the obstruction of the guide surface, the elastic potential energy of the first spring 581 is released and drives the transmission rod 582 to move upward. The transmission rod 582 pushes the inclined block 587 and the slot 531 to engage with each other, so that the position of the movable opening 53 is locked in a state of being close to the fixed opening 52. At this time, a large force is required to move the movable opening 53 downward to disengage the inclined block 587 from the slot 531.

[0053] Working principle: The three-way valve 3 uses a preset program to discharge the exhaust gas in the air inlet pipe 2 to the first chamber 11 or the second chamber 12, and stops exhausting the other chamber. When one of the chambers needs to clean the dust in the filter bag assembly 5, the other chamber is started.

[0054] In the default state, the movable plate 15 is located at the highest position, that is, close to the port position of the inner filter cartridge 51. At this time, the outer filter bag 57 is unfolded in the axial direction and sleeved on the outside of the inner filter cartridge 51. The bottom of the outer filter bag 57 is fixedly connected to the bottom of the inner filter cartridge 51. Figure 5 As shown. Since the filter holes of the outer filter bag 57 are larger than the filter holes of the inner filter cartridge 51, when the exhaust gas passes through the filter bag assembly 5, the heavy dust therein is intercepted outside the outer filter bag 57 due to its larger particles, while the light dust enters the outer filter bag 57 and is finally intercepted by the inner filter cartridge 51. At this time, the area between the outer filter bag 57 and the inner filter cartridge 51 is the light dust storage area, which separates the light and heavy dust.

[0055] When air intake in the chamber stops, the movable plate 15 is first driven downward in the vertical direction by a driving unit 16 such as a linear motor or an electric telescopic rod, the distance between the movable plate 15 and the port of the inner filter cartridge 51 increases, and the movable port 53 of the outer filter bag 57 moves downward.

[0056] When the movable opening 53 moves downward from the default state, the angle between the first folding rod 54 and the second folding rod 55 decreases, and the angle between the first folding rod 54 and the second folding rod 55 becomes as follows: Figure 6 In the state shown, the heavy dust on the upper side automatically rolls down along the inclined surface due to the swinging, while the heavy dust on the lower side swings with the second folding rod 55, and the swinging angle is large, which can make the heavy dust on the lower side automatically roll down to the upper side of the next group.

[0057] Each group of folding components folds and causes the slide 56 to move downward. The slide 56 drives the scraper 561 to slide down along the outer wall of the inner filter cartridge 51 and scrape the outer wall of the inner filter cartridge 51 to scrape off the adsorbed light dust. During the folding process, the dust in the light dust storage area is compressed by the inner wall of the outer filter bag 57, so that the air between the light dust cores is squeezed out, the distance between the dust cores is shortened, the density is increased, and the light dust is agglomerated and agglomerated by pressure.

[0058] The movable opening 53 will push the rotating member 584 downward, causing the rotating member 584 to rotate clockwise until it is offset from the movable opening 53. Then, the rotating member 584 is located above the movable opening 53 and will not interfere with the downward movement of the movable opening 53. At this time, the upward swing amplitude of the slide rail 586 is small, and it drives the top of the movable rod 591 to move slightly upward, and the movable bottom plate 59 remains closed. When the movable opening 53 moves upward again, it will push the rotating member 584 upward, causing the rotating member 584 to rotate counterclockwise, and drive the slide rail 586 to rotate counterclockwise, and push the top of the movable rod 591 downward through the slide rail 586, so that the bottom end of the movable rod 591 moves downward for a distance and then pushes the movable bottom plate 59. In the pushing process, the bottom end of the movable rod 591 is always in the raised block, so that the movable bottom plate 59 is open.

[0059] At the same time, the rotating member 584 rotates counterclockwise and drives the cylinder to rotate counterclockwise to the inclined surface. The cylinder squeezes the inclined surface to make the hook 583 move downward, and the first spring 581 is squeezed and accumulates force. After the cylinder is separated from the inclined surface, the cylinder falls into the hook 583. At this time, the accumulated force of the first spring 581 is released and drives the hook 583 to clamp the rotating member 584, so that the movable bottom plate 59 remains in an open state.

[0060] At this time, the agglomerated light dust falls due to its own weight, and falls together with the heavy dust outside the outer filter bag 57, which can effectively reduce the problem of continuous floating of light dust.

[0061] During the upward movement of the movable port 53, the guiding surface first contacts the inclined block 587. The inclined block 587 is pushed by the guiding surface and radially approaches the axis of the port of the inner filter cartridge 51, so that the inclined block 587 squeezes the first end of the transmission rod 582. The transmission rod 582 slides downward and the hook portion 583 at the second end moves downward synchronously, so that the hook portion 583 is staggered with the cylinder on the rotating member 584, and the movable bottom plate 59 is lifted by the movable rod 591, so that the movable bottom plate 59 is restored to be closed.

[0062] Finally, the jet is sprayed through the jet unit. Since the nozzle is located in the middle of the filter bag assembly 5, that is, at the axis of the inner filter cartridge 51, the ejected gas diffuses along the outer wall of the inner filter cartridge 51, and the impact force of the airflow is weakened. The weakened airflow will be blocked by the inner wall of the outer filter bag 57, and form a flow direction from top to bottom under the guidance of the inner wall, blowing the residual dust in the light dust storage area downward, accelerating the sedimentation of light dust. After the jet is completed, the movable bottom plate 59 is driven to close and return to the default state.

[0063] The above description is only by way of illustration of certain exemplary embodiments of the present invention. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A device for treating exhaust gas after a catalytic oxidation reaction of nitrogen oxides, comprising a dust removal box (1) and a purification chamber (13), characterized in that: It also comprises a first chamber (11) and a second chamber (12) which are opened in the dust removal box (1) and separated from each other, and an air inlet pipe (2) which alternately supplies air to the first chamber (11) and the second chamber (12), and a three-way valve (3) which is switched under program control is arranged on the air inlet pipe; A filter bag assembly (5) disposed in the dust removal box (1), comprising an inner filter cartridge (51) and an outer filter bag (57) disposed around the inner filter cartridge (51) to enclose a light dust storage area, and an intermittently open movable bottom plate (59) is installed at the bottom of the light dust storage area; The outer filter bag (57) is in a folded state in an axial direction; The movable port (53) is fixedly arranged at the port of the outer filter bag (57) and is driven to move in the vertical direction.

2. The exhaust gas treatment device after catalytic oxidation reaction of nitrogen oxides according to claim 1 is characterized in that: It also includes a folding assembly for supporting the outer filter bag (57), which includes a first folding rod (54) and a second folding rod (55) hinged to each other, and a sliding member (56) is provided at the connection position of each folding assembly to slide along the outer wall of the inner filter cartridge (51).

3. The exhaust gas treatment device after catalytic oxidation reaction of nitrogen oxides according to claim 2 is characterized in that: The first folding rod (54) and the second folding rod (55) form an acute angle structure obliquely pointing downwards when in a folded state.

4. The exhaust gas treatment device after catalytic oxidation reaction of nitrogen oxides according to claim 2 is characterized in that: The sliding member (56) is rotatably provided with a rotating wheel (563) which rotates as the folding assembly unfolds.

5. The exhaust gas treatment device after catalytic oxidation reaction of nitrogen oxides according to claim 1 is characterized in that: It also includes keels (521) arranged in a circumferential array on the inner filter cartridge (51).

6. The exhaust gas treatment device after catalytic oxidation reaction of nitrogen oxides according to claim 1 is characterized in that: It also includes a rotating member (584) that is rotatably arranged relative to the inner filter cartridge (51) and forms a blocking fit with the movable opening (53), and the rotating member (584) and the movable bottom plate (59) maintain synchronous movement.

7. The exhaust gas treatment device after catalytic oxidation reaction of nitrogen oxides according to claim 6 is characterized in that: It also includes a hook-shaped portion (583) on which a first spring (581) for maintaining a predetermined height is arranged, and the rotating member (584) has a station in its movable stroke for engaging with the hook-shaped portion (583).

8. The exhaust gas treatment device after catalytic oxidation reaction of nitrogen oxides according to claim 7 is characterized in that: It also includes a transmission rod (582) slidably arranged in a vertical direction, and the hook-shaped portion (583) is fixedly arranged at the end of the transmission rod (582).

9. The exhaust gas treatment device after catalytic oxidation reaction of nitrogen oxides according to claim 8, characterized in that: It also includes an inclined block (587) that slides radially along the port of the inner filter cartridge (51) and is used to engage the movable port (53).

10. The exhaust gas treatment device after catalytic oxidation reaction of nitrogen oxides according to claim 9, characterized in that: The inclined block (587) and the transmission rod (582) move synchronously.

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