Filtering and purifying device for nitrogen oxide mixed gas

Abstract

The utility model relates to the technical field of gas treatment, in particular to a nitrogen oxide mixed gas filtering and purifying device which comprises a barrel and a filtering assembly, one end, connected with nitric acid generation equipment, of the barrel is a gas inlet end, the other end, connected with next process equipment, of the barrel is a gas outlet end, and a manhole is formed in the side wall of the barrel; the barrel is connected with an inspection door at the manhole; the filter assembly is located in the barrel and comprises a connecting plate and a plurality of filter parts, the arrangement direction of the connecting plate is perpendicular to the axis direction of the barrel, the connecting plate is connected with the side wall of the barrel, a plurality of through holes are formed in the connecting plate, the filter parts correspond to the through holes one to one, each filter part comprises a filter cartridge, one end of each filter cartridge is open, and the filter cartridges penetrate through the through holes. The open end of the filter cartridge is detachably connected to the connecting plate, the other end of the filter cartridge is located at one end of the connecting plate away from the gas inlet end of the cylinder, and the filter cartridge is used for filtering particles in mixed gas; the device has the effects that the filter cartridge is replaced more conveniently and quickly, and the filter cartridge is convenient to clean.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of gas treatment, in particular to a filtering and purifying device for nitrogen oxide mixed gas. BACKGROUND

[0002] In the production process of nitric acid, air and ammonia gas are subjected to catalytic combustion reaction at a high temperature of 850-900 DEG C under a pressure of 0.35 MPa in an oxidation furnace to generate nitrogen oxide, and a considerable amount of platinum gold fine particles are lost in the process pipeline along with the high-temperature gas, the particles dust can enter the absorption tower along with the airflow, and finally mixed into the finished product nitric acid, which seriously affects the quality of the product.

[0003] In the prior art, some dust filtering devices are only suitable for high-pressure production devices with high pressure, small capacity and high ammonia consumption. The dust filtering device is to cut off the gas pipeline in the original production line for about three meters, weld two pairs of flanges at the cut-off ends for installation and connection, weld an inner flange in the cut-off pipeline, fix a cylindrical filter frame structure on the inner flange through bolts, wrap glass fiber filter material on the cylindrical filter frame, and then install the pipeline section back into the original pipeline for connection through the flanges and bolts.

[0004] In view of the above-mentioned related technology, the existing dust filtering device has the following shortcomings: the system pressure drop is large, the filter material replacement cost is too high (a crane is needed for disassembly and assembly), the connection of the two pairs of large flanges causes hidden dangers of gas leakage (nitrogen oxide is a toxic and harmful gas) in the production system, which seriously threatens the safety production, in addition, the filter material replacement needs to take out the entire filter from the pipeline, which is extremely inconvenient for cleaning and replacement, thereby causing great waste. CONTENT OF THE INVENTION

[0005] In order to overcome the above problems, the application provides a filtering and purifying device for nitrogen oxide mixed gas.

[0006] The filtering and purifying device for nitrogen oxide mixed gas provided by the application adopts the following technical scheme:

[0007] A filtering and purifying device for nitrogen oxide mixed gas, comprising a cylinder and a filter assembly, the cylinder is hollow, one end of the cylinder connected with a nitric acid generating device is an air inlet end, the other end of the cylinder connected with a next process device is an air outlet end, a manhole is arranged in the side wall of the cylinder, and an inspection door is connected to the cylinder at the manhole.

[0008] The filter assembly is located in the cylinder, the filter assembly comprises a connecting plate and a plurality of filter pieces, the setting direction of the connecting plate is perpendicular to the axis direction of the cylinder, the connecting plate is connected with the side wall of the cylinder, a plurality of through holes are formed in the connecting plate, the filter pieces correspond to the through holes one by one, the filter piece comprises a filter cylinder, one end of the filter cylinder is provided with an opening, the filter cylinder passes through the through hole, the opening end of the filter cylinder is detachably connected to the connecting plate, the other end of the filter cylinder is located at one end of the connecting plate away from the gas inlet end of the cylinder, and the filter cylinder is used for filtering particles in the mixed gas.

[0009] By adopting the above technical scheme, when the filter purification device for nitrogen oxide mixed gas is needed, first, personnel enter the cylinder, the filter cylinder passes through the through hole, and then the filter cylinder is connected with the connecting plate. Subsequently, the mixed gas is introduced into the cylinder, and the filtered mixed gas is discharged through the gas outlet end. When the filter cylinder needs to be replaced, personnel enter the cylinder through the manhole, the personnel approach the filter cylinder to be replaced, the filter cylinder is separated from the connecting plate, and the remaining filter cylinders to be replaced are replaced according to the above steps. The detachable design of the device does not need large tools to assist, so that the filter cylinder replacement is more convenient and fast, thereby facilitating the filter cylinder cleaning, greatly reducing the maintenance time and cost.

[0010] In one specific embodiment, the filter piece further comprises a filter ring coaxially fixed to the opening end of the filter cylinder.

[0011] The filter assembly further comprises a plurality of connecting pieces corresponding to the through holes, the connecting piece comprises two insertion blocks and two connecting rods, the two insertion blocks are symmetrically distributed along the axis of the through hole, the connecting plate is provided with two accommodation grooves in the through hole for accommodating the insertion blocks, the insertion blocks are elastically and slidably connected to the connecting plate, the two insertion blocks move towards or away from each other, the insertion blocks are inclined towards the side away from the gas inlet end of the cylinder, the inclined surfaces of the two insertion blocks are inclined towards each other from the gas inlet end to the gas outlet end, the filter ring is provided with an insertion groove for inserting the insertion block, the connecting rod corresponds to the insertion block one by one, the setting direction of the connecting rod is consistent with the axis direction of the cylinder, one end of the connecting rod extends into the insertion groove on the side of the filter ring away from the filter cylinder, and the connecting rod is threadedly connected to the filter ring. The connecting rod can drive the insertion block to move away from the filter ring.

[0012] By adopting the above technical scheme, the design of the filter ring and the connecting rod makes the connection between the filter cartridge and the connecting plate more firm and reliable, and facilitates quick disassembly and assembly. Specifically, the filter ring is coaxially fixed at the open end of the filter cartridge, which increases the overall stability and strength of the filter cartridge and ensures that the filter cartridge will not deform or fall off under the impact of high-speed airflow; the inclined design of the plug block can automatically compress the first spring when the filter cartridge is installed, facilitating the smooth insertion of the filter cartridge into the through hole; after the filter cartridge is completely inserted, the first spring restores the deformation, and the plug block is embedded in the plug slot on the filter ring, achieving stable connection of the filter cartridge and the connecting plate; the threaded connection of the connecting rod enables the operator to control the position of the plug block by screwing the connecting rod, thereby easily disassembling the filter cartridge from the connecting plate, greatly improving the convenience of maintaining and replacing the filter cartridge; in summary, the design scheme not only enhances the stability of the filter cartridge, but also significantly improves the replacement efficiency of the filter cartridge and reduces the maintenance cost.

[0013] In a specific implementable scheme, a rotating assembly is further included, the rotating assembly comprising a placing member, the placing member being located on one side of the connecting plate close to the air outlet end, the placing member comprising a placing rack, a plurality of placing boxes and a plurality of second springs, the placing rack being arranged in parallel with the connecting plate, the placing rack being connected with the cylinder body, the plurality of placing boxes being fixed on one side of the placing rack close to the connecting plate, the placing boxes corresponding to the filter cartridges one by one, the placing boxes being open on the side away from the placing rack, the filter cartridges being fitted with the openings on the side away from the connecting plate, the second springs corresponding to the placing boxes one by one, the second springs being arranged along the axis of the cylinder body, one end of the second spring being fixed with the placing box, and the other end being in abutment with the filter cartridge.

[0014] By adopting the above technical scheme, the addition of the rotating assembly significantly improves the service life and maintenance convenience of the filter cartridge; the design of the placing member enables each filter cartridge to be stably fixed in the corresponding placing box, ensuring effective filtration of the gas when passing through the filter cartridge and reducing the problem of incomplete filtration caused by loose filter cartridges; the presence of the second spring enables the filter cartridge to be easily separated from the placing box through simple operation when replacement is required, without the need for complex tools or manual intervention, thereby greatly reducing the maintenance cost and time.

[0015] In a specific implementable scheme, the filter assembly further comprises a connecting ring coaxially fixed with the cylinder body, and the connecting plate is rotationally connected in the connecting ring.

[0016] The rotating assembly further comprises a rotating member, the placing rack being rotationally connected with the cylinder body, the rotating member being connected with the cylinder body, and the rotating member being connected with the placing rack to drive the placing rack to rotate around the axis of the cylinder body.

[0017] By adopting the above technical scheme, the rotating member enables the connecting plate and the filter element thereon to rotate in the cylinder, thereby enhancing the self-cleaning capability of the filter cartridge, reducing the risk of particle blockage, and improving the filtering efficiency; the rotation of the filter cartridge can utilize centrifugal force to help remove particles adhering to the inner wall of the filter cartridge, thereby reducing the resistance on the surface of the filter cartridge and lowering the pressure drop of the system; the automatic ash removal function of the filter cartridge significantly reduces the frequency of manual cleaning, prolongs the cleaning cycle of the filter, and reduces the maintenance cost.

[0018] In a specific implementable scheme, the rotating member comprises an outer gear ring, a rotating motor and a gear, the outer gear ring is coaxially sleeved outside the placing rack, a second ring groove for the rotation of the outer gear ring is formed in the cylinder, a meshing groove is formed in the outer wall of the cylinder, the housing of the rotating motor is connected to the cylinder, the output shaft of the rotating motor is coaxially fixed with the gear, and the gear extends into the meshing groove on one side and meshes with the outer gear ring.

[0019] By adopting the above technical scheme, the second ring groove for the rotation of the outer gear ring is formed in the cylinder, thereby ensuring that the outer gear ring can stably rotate in the cylinder. Meanwhile, the meshing groove formed in the outer wall of the cylinder enables the gear to be well meshed with the outer gear ring, thereby ensuring the reliability of transmission, the rotating motor is fixedly connected to the cylinder, and the output shaft thereof is coaxially fixed with the gear, thereby further enhancing the stability of the entire system; when the rotating motor is started, the gear drives the outer gear ring to rotate, thereby driving the placing rack and the filter cartridge thereon to synchronously rotate, which not only helps to remove particles adhering to the inner wall of the filter cartridge by utilizing centrifugal force, thereby reducing the pressure drop of the system, but also prolongs the cleaning cycle of the filter and improves the overall working efficiency.

[0020] In a specific implementable scheme, the filter cartridge further comprises a stirring assembly, the stirring assembly comprises at least one stirring blade, the stirring blade is fixed to one side of the connecting plate close to the gas inlet end of the cylinder, the stirring blade is arranged along the flow direction of the gas, a brush is fixed to one side of the stirring blade close to the cylinder, the brush is in contact with the inner wall of the cylinder, and the cylinder is provided with a cleaning groove for storing particles, the cleaning groove is arranged along the flow direction of the gas.

[0021] By adopting the above technical scheme, the stirring assembly can effectively clean the particle substances adhering to the inner wall of the cylinder. Specifically, the stirring blade is fixed to one side of the connecting plate close to the gas inlet end of the cylinder, and the stirring blade can continuously scrape the inner wall of the cylinder along with the rotation of the connecting plate, thereby preventing the accumulation of particle substances on the inner wall of the cylinder and reducing the pressure drop of the system. Meanwhile, the brush is in contact with the inner wall of the cylinder, thereby further enhancing the cleaning effect and ensuring the cleanliness of the inner wall of the cylinder. In addition, the design of the cleaning groove enables the particles cleaned by the brush to be stored in the cleaning groove, thereby avoiding the re-entry of the particles into the gas and improving the overall performance and reliability of the filtering and purifying device.

[0022] In one specific implementation, the cylinder is connected with a sealing door at the manhole, the sealing door is located on the side of the inspection door close to the inside of the cylinder, and the side of the sealing door away from the inspection door is flush with the inner wall of the cylinder.

[0023] By adopting the above technical scheme, the design of the sealing door effectively prevents the leakage of nitrogen oxide mixed gas during the filtration and purification process, improves the safety of the device, and the design of the sealing door flush with the inner wall of the cylinder ensures smooth airflow.

[0024] In one specific implementation, the stirring blade is wavy.

[0025] By adopting the above technical scheme, the wavy design makes the stirring blade produce more complex airflow disturbance during rotation, which helps to further remove particles on the inner wall of the filter cartridge, reduce the pressure drop of the system, and prolong the cleaning period of the filter.

[0026] In summary, the present application includes at least one of the following beneficial technical effects:

[0027] 1. The designed nitrogen oxide mixed gas filtration and purification device has a detachable design, which does not require large tools to assist, making it more convenient and fast to replace the filter cartridge, thereby facilitating filter cartridge cleaning and greatly reducing maintenance time and cost.

[0028] 2. The designed nitrogen oxide mixed gas filtration and purification device uses a threaded connection of the connecting rod, allowing the operator to control the position of the plug by screwing the connecting rod, thereby easily detaching the filter cartridge from the connecting plate, greatly improving the convenience of maintaining and replacing the filter cartridge; in summary, this design not only enhances the stability of the filter cartridge, but also significantly improves the replacement efficiency of the filter cartridge and reduces maintenance costs.

[0029] 3. The designed nitrogen oxide mixed gas filtration and purification device uses a rotating member to enable the connecting plate and the filter element thereon to rotate within the cylinder, enhancing the self-cleaning ability of the filter cartridge, reducing the risk of particle blockage, and improving the filtration efficiency; the rotation of the filter cartridge can utilize centrifugal force to help remove particles attached to the inner wall of the filter cartridge, reducing the resistance on the surface of the filter cartridge and thereby reducing the pressure drop of the system; the automatic dust removal function of the filter cartridge significantly reduces the frequency of manual cleaning, prolongs the cleaning period of the filter, and reduces maintenance costs. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 is a structural schematic diagram of the first perspective in this embodiment.

[0031] Figure 2 is a cross-sectional view of the filter assembly in this embodiment.

[0032] Figure 3 isFigure 2 Enlarged view of middle A.

[0033] Figure 4 is a cross-sectional view of the cylinder in this embodiment.

[0034] Figure 5 is a cross-sectional view of the filter cartridge in this embodiment.

[0035] Figure 6 is a structural schematic view of the second perspective in this embodiment.

[0036] Figure 7 is a structural schematic view of the third perspective in this embodiment.

[0037] BRIEF DESCRIPTION OF THE DRAWINGS: 1, cylinder; 11, manhole; 12, inspection door; 121, gasket; 13, second ring groove; 14, meshing groove; 15, cleaning groove; 16, sealing door; 2, filter assembly; 21, connecting ring; 211, first ring groove; 22, connecting plate; 221, through hole; 222, accommodating groove; 23, filter piece; 231, filter ring; 2311, insertion slot; 232, filter cartridge; 24, connecting piece; 241, insertion block; 242, first spring; 243, connecting rod; 3, rotating assembly; 31, placing piece; 311, placing rack; 312, placing box; 313, second spring; 32, rotating piece; 321, outer tooth ring; 322, rotating plate; 323, rotating motor; 324, gear; 4, stirring assembly; 41, stirring blade; 411, brush. DETAILED DESCRIPTION

[0038] The following description will be made in conjunction with the accompanying drawings. Figures 1-7 The application is described in further detail.

[0039] The embodiments of the present application disclose a filtering and purifying device for a nitrogen oxide mixed gas.

[0040] Reference Figure 1 A filtering and purifying device for a nitrogen oxide mixed gas comprises a cylinder 1 and a filter assembly 2, and the filter assembly 2 is arranged on the cylinder 1.

[0041] Reference Figure 1 The cylinder 1 is hollow, and both ends of the cylinder 1 are arranged in a tapered shape; one end of the cylinder 1 is arranged as an air inlet end, and the other end is arranged as an air outlet end; the air inlet end is connected with a nitric acid generating device, and is used for making the nitrogen oxide mixed gas enter into the cylinder 1; and the air outlet end is connected with a next process device, and is used for discharging the treated nitrogen oxide mixed gas.

[0042] Reference Figure 1 , Figure 2 and Figure 3The filter assembly 2 is located in the cylinder body 1, the filter assembly 2 comprises a connecting ring 21, a connecting plate 22, a plurality of filter pieces 23 and a plurality of connecting pieces 24, the connecting ring 21 is coaxially arranged with the cylinder body 1, the connecting ring 21 is welded to the inner wall of the cylinder body 1, the setting direction of the connecting plate 22 is perpendicular to the axis direction of the cylinder body 1, and the connecting plate 22 is located in the connecting ring 21, the connecting plate 22 is rotationally connected to the connecting ring 21, the rotation axis of the connecting plate 22 coincides with the axis of the cylinder body 1, a first ring groove 211 for the rotation of the connecting plate 22 is formed in the inner wall of the connecting ring 21, a sealing ring is arranged in the first ring groove 211, the sealing ring is fixedly bonded to the connecting ring 21, the sealing ring can seal the connecting position of the connecting plate 22 and the connecting ring 21, a plurality of through holes 221 are formed in the connecting plate 22, the through holes 221 penetrate the connecting plate 22 along the thickness direction of the connecting plate 22, the filter pieces 23 correspond to the through holes 221 one by one, the filter piece 23 comprises a filter ring 231 and a filter cylinder 232, one end of the filter cylinder 232 is provided with an opening, the filter ring 231 is coaxially fixedly connected to the opening end of the filter cylinder 232 through a screw, the axis of the filter ring 231 coincides with the axis of the through hole 221, the filter ring 231 is detachably connected to the connecting plate 22, the other end of the filter cylinder 232 is located at the end of the connecting plate 22 away from the gas inlet end of the cylinder body 1, and the filter cylinder 232 can filter particles in the nitrogen oxide mixed gas; a manhole 11 for personnel access is formed in the side wall of the cylinder body 1, the manhole 11 is located at the side of the connecting plate 22 close to the gas inlet end, the cylinder body 1 is provided with an inspection door 12 at the manhole 11, the inspection door 12 is detachably connected to the cylinder body 1 through a quick release switch, and a sealing gasket 121 is fixedly bonded to the periphery of the inspection door 12, which can seal the connecting position of the inspection door 12 and the cylinder body 1.

[0043] With reference to Figure 1 , Figure 2 and Figure 3 , the connecting piece 24 corresponds to the through hole 221 one by one, the connecting piece 24 comprises two plug blocks 241, two first springs 242 and two connecting rods 243, the two plug blocks 241 are located in the through hole 221, and the two plug blocks 241 are symmetrically distributed along the axis of the through hole 221, the connecting plate 22 is provided with two accommodating grooves 222 in the through hole 221 for accommodating the plug blocks 241, the plug blocks 241 are slidingly connected to the connecting plate 22, and the two plug blocks 241 move towards or away from each other, the plug block 241 is arranged to be inclined towards the gas inlet end of the cylinder body 1, and the inclined surfaces of the two plug blocks 241 are inclined towards each other from the gas inlet end to the gas outlet end, the first spring 242 corresponds to the plug block 241 one by one, the first spring 242 is located in the accommodating groove 222, the first spring 242 is arranged along the sliding direction of the plug block 241, one end of the first spring 242 is welded to the plug block 241, and the other end is welded to the connecting plate 22, the side wall of the filter ring 231 is provided with a plug groove 2311 for inserting the plug block 241, which facilitates the connection of the filter ring 231 and the connecting plate 22, and in the embodiment, the first spring 242 is a compression spring.

[0044] With reference to Figure 1 , Figure 2 and Figure 3 , the connecting rod 243 corresponds to the plug 241 one by one, the setting direction of the connecting rod 243 is consistent with the axis direction of the cylinder body 1, one end of the connecting rod 243 is provided in the filter ring 231 away from the filter cartridge 232 side and extends into the plug groove 2311, the connecting rod 243 is screwed on the filter ring 231, the connecting rod 243 is screwed, the sliding direction of the connecting rod 243 is parallel to the axis direction of the cylinder body 1, when the filter cartridge 232 and the connecting plate 22 need to be connected, the filter cartridge 232 passes through the through hole 221, in this process, the plug 241 is located in the accommodating groove 222, the first spring 242 is compressed, until the filter ring 231 is located in the through hole 221, the first spring 242 restores the deformation, the plug 241 is inserted into the plug groove 2311, the filter cartridge 232 and the connecting plate 22 can be connected; when the filter cartridge 232 and the connecting plate 22 need to be separated, the connecting rod 243 is pushed by the person, the connecting rod 243 pushes the plug 241, the plug 241 moves away from the filter ring 231 side, until the plug 241 is located in the accommodating groove 222, the person takes out the filter cartridge 232, so that the filter cartridge 232 is convenient to replace.

[0045] With reference to Figure 4 , the nitrogen oxide mixed gas filtering and purifying device further comprises a rotating assembly 3 and a stirring assembly 4, both of which are arranged on the cylinder body 1.

[0046] With reference to Figure 4 and Figure 5, the rotating assembly 3 comprises a placing part 31 and a rotating part 32, the placing part 31 is located in the cylinder body 1, and the placing part 31 is located on the side of the connecting plate 22 close to the air outlet end, the placing part 31 comprises a placing rack 311, a plurality of placing boxes 312 and a plurality of second springs 313, the placing rack 311 is arranged in parallel with the connecting plate 22, the placing rack 311 is connected with the rotating part 32, the plurality of placing boxes 312 are located on the side of the placing rack 311 close to the connecting plate 22, the placing box 312 corresponds to the filter cartridge 232 one by one, the placing box 312 is welded to the placing rack 311, the side of the placing box 312 away from the placing rack 311 is provided with an opening, the end of the filter cartridge 232 away from the connecting plate 22 is located in the opening of the placing box 312, and the end of the filter cartridge 232 away from the connecting plate 22 is fitted with the opening; the second spring 313 corresponds to the placing box 312 one by one, the second spring 313 is arranged along the axis of the cylinder body 1, one end of the second spring 313 is welded to the placing box 312, and the other end of the second spring 313 is in abutment with the filter cartridge 232; when the filter ring 231 is connected with the connecting plate 22, the end of the filter cartridge 232 away from the connecting plate 22 extends into the opening, at this time, the filter cartridge 232 is in abutment with the second spring 313, and the second spring 313 is compressed; when it is required to separate the filter cartridge 232 from the connecting plate 22, the second spring 313 restores the deformation, can push the filter cartridge 232 away from the placing box 312, and the filter cartridge 232 is convenient to take out; in the embodiment, the second spring 313 is a compression spring.

[0047] With reference to Figure 4 , the rotating part 32 comprises an outer gear ring 321, a rotating plate 322, a rotating motor 323 and a gear 324, the outer gear ring 321 is coaxially sleeved outside the placing rack 311, and the outer gear ring 321 is fixedly connected with the placing rack 311 through screws; a second ring groove 13 for the rotation of the outer gear ring 321 is formed in the cylinder body 1, and a meshing groove 14 is formed in the outer wall of the cylinder body 1; the rotating plate 322 is welded to the cylinder body 1, and the rotating plate 322 is close to the meshing groove 14; the shell of the rotating motor 323 is fixedly connected to the rotating plate 322 through screws; the output shaft of the rotating motor 323 is coaxially welded with the gear 324; the rotating motor 323 drives the gear 324 to rotate; one side of the gear 324 extends into the meshing groove 14 and meshes with the outer gear ring 321, so that the outer gear ring 321 can be driven to rotate, thereby driving the filter cartridge 232 to rotate; the rotation of the filter cartridge 232 can utilize the centrifugal force to help remove the particles attached to the inner wall of the filter cartridge 232, reduce the pressure drop and prolong the cleaning period of the filter cartridge 232.

[0048] With reference to Figure 6 and Figure 7The stirring assembly 4 comprises at least one stirring blade 41, in the embodiment, the number of the stirring blades 41 is two, both of the two stirring blades 41 are located in the barrel 1, both of the two stirring blades 41 are located on the side of the connecting plate 22 close to the gas inlet end of the barrel 1, and both of the two stirring blades 41 are uniformly distributed along the circumference of the barrel 1, the stirring blade 41 is arranged along the flow direction of the gas, one end of the stirring blade 41 is welded to the connecting plate 22, the stirring blade 41 rotates with the connecting plate 22, the side of the stirring blade 41 close to the barrel 1 is fixedly bonded with a brush 411, the brush 411 is in contact with the inner wall of the barrel 1, the brush 411 can clean the inner wall of the barrel 1, the stirring blade 41 is in a wave shape, the barrel 1 is provided with a cleaning groove 15 for storing particles, the cleaning groove 15 is arranged along the flow direction of the gas; the barrel 1 is provided with a sealing door 16 at the manhole 11, the sealing door 16 is located on the side of the inspection door 12 close to the inside of the barrel 1, the sealing door 16 is rotatably connected to the barrel 1, and the sealing door 16 rotates away from the inspection door 12, the side of the sealing door 16 away from the inspection door 12 is flush with the inner wall of the barrel 1, so that the brush 411 can clean the particles.

[0049] The implementation principle of the nitrogen oxide mixed gas filtering and purifying device in the embodiment of the application is as follows: when the nitrogen oxide mixed gas filtering and purifying device needs to be used, first, personnel install the filtering assembly 2, then, the mixed gas is introduced into the barrel 1, at this time, the rotating member 32 in the rotating assembly 3 is started, the rotating member 32 can drive the placing member 31 and the connecting plate 22 to rotate, the mixed gas flows to the gas outlet after passing through the filter cartridge 232, in the process, the stirring assembly 4 rotates with the connecting plate 22, and can clean the particles adhered to the side wall of the barrel 1 into the cleaning groove 15.

[0050] When the filter cartridge 232 needs to be replaced, personnel enter the barrel 1 through the manhole 11, the personnel are close to the filter cartridge 232 that needs to be replaced, the personnel push the connecting rod 243, the connecting rod 243 pushes the plug 241, the plug 241 moves away from the filter ring 231, until the plug 241 is located in the accommodating groove 222, at this time, the second spring 313 restores the deformation, can drive the filter cartridge 232 to separate from the placing box 312, personnel take out the filter cartridge 232, and then the new filter cartridge 232 is inserted into the through hole 221, in the process, the plug 241 is located in the accommodating groove 222, the first spring 242 is compressed, until the filter ring 231 is located in the through hole 221, the first spring 242 restores the deformation, the plug 241 is inserted into the insertion slot 2311, the filter cartridge 232 is inserted into the placing box 312, and the second spring 313 is deformed, according to the above steps, the remaining filter cartridges 232 that need to be replaced can be replaced.

[0051] The above are preferred embodiments of the application, which do not limit the protection scope of the application, therefore: all equivalent changes made according to the structure, shape and principle of the application should be covered within the protection scope of the application.

Claims

1. A filtration and purification device for a mixed gas of nitrogen oxides, characterized in that: The utility model provides a filter assembly and cylinder body, the filter assembly is located in the cylinder body, the filter assembly includes connecting plate and a plurality of filter parts, the setting direction of connecting plate is perpendicular with the axial direction of cylinder body, connecting plate is connected with the lateral wall of cylinder body, a plurality of through -hole (221) are seted up on connecting plate (22), filter part (23) corresponds with through -hole (221), filter part (23) includes filter cartridge (232), one end of filter cartridge (232) is open setting, filter cartridge (232) passes through through -hole (221), the open end of filter cartridge (232) can be detachably connected to connecting plate (22), the other end of filter cartridge (232) is located in the one end of connecting plate (22) away from the air inlet end of cylinder body, and filter cartridge (232) is used for filtering the particles in mixed gas. The filter part (23) further includes a filter ring (231) coaxially fixed to the open end of the filter cartridge (232); 2. The device for filtering and purifying a nitric oxide mixed gas according to claim 1, characterized by: The filter assembly (2) further includes a plurality of connecting pieces (24), the connecting pieces (24) correspond to the through holes (221) one by one, the connecting pieces (24) include two insertion blocks (241) and two connecting rods (243), the two insertion blocks (241) are symmetrically distributed along the axis of the through holes (221), the connecting plate (22) is provided with two accommodation grooves (222) in the through holes (221) for accommodating the insertion blocks (241), the insertion blocks (241) are elastically and slidably connected to the connecting plate (22), the two insertion blocks (241) move towards or away from each other, the insertion blocks (241) are inclined towards the air inlet end of the cylinder body, the inclined surfaces of the two insertion blocks (241) are inclined towards each other from the air inlet end to the air outlet end, the filter ring (231) is provided with an insertion groove (2311) on the side wall for inserting the insertion blocks (241), the connecting rods (243) correspond to the insertion blocks (241) one by one, the connecting rods (243) are arranged in the same direction as the axis of the cylinder body, one end of the connecting rods (243) extends into the insertion groove (2311) from the side of the filter ring (231) away from the filter cartridge (232), the connecting rods (243) are threadedly connected to the filter ring (231), and the connecting rods (243) can push the insertion blocks (241) to move away from the filter ring (231). ​ 3. The device for filtering and purifying a nitric oxide mixed gas according to claim 2, characterized by: Further include rotating assembly (3), the rotating assembly (3) includes placing piece (31), the placing piece (31) is located on the side of the connecting plate (22) close to the air outlet end, the placing piece (31) includes placing rack (311), a plurality of placing box (312) and a plurality of second spring (313), the placing rack (311) is arranged in parallel with connecting plate (22), the placing rack (311) is connected with the barrel (1), a plurality of the placing box (312) are all fixed on the side of the placing rack (311) close to the connecting plate (22), the placing box (312) corresponds to the filter cartridge (232), the placing box (312) is open on the side away from the placing rack (311), the filter cartridge (232) is away from the end of the connecting plate (22) and the opening is engaged, the second spring (313) corresponds to the placing box (312), the second spring (313) is arranged along the axis of the barrel (1), one end of the second spring (313) is fixed with the placing box (312), and the other end is abutted with the filter cartridge (232).

4. The device for filtering and purifying a nitric oxide mixed gas according to claim 3, characterized by: The filter assembly (2) further comprises a connecting ring (21), the connecting ring (21) is coaxially fixed with the barrel (1), and the connecting plate (22) is rotatably connected in the connecting ring (21). The rotating assembly (3) further comprises a rotating piece (32), the placing rack (311) is rotatably connected to the barrel (1), the rotating piece (32) is connected with the barrel (1), and the rotating piece (32) is connected with the placing rack (311) to drive the placing rack (311) to rotate around the axis of the barrel (1).

5. The device for filtering and purifying a nitric oxide mixed gas according to claim 4, characterized by: The rotating piece (32) comprises an outer gear ring (321), a rotating motor (323) and a gear (324), the outer gear ring (321) is coaxially sleeved outside the placing rack (311), a second ring groove (13) is formed in the barrel (1) for the rotation of the outer gear ring (321), a meshing groove (14) is formed in the outer wall of the barrel (1), the housing of the rotating motor (323) is connected to the barrel (1), the output shaft of the rotating motor (323) is coaxially fixed with the gear (324), and one side of the gear (324) extends into the meshing groove (14) and is engaged with the outer gear ring (321).

6. The device for filtering and purifying a nitric oxide mixed gas according to claim 4, characterized by: Further include stirring assembly (4), the stirring assembly (4) includes at least one stirring blade (41), the stirring blade (41) is fixed on the side of the connecting plate (22) close to the air inlet end of the barrel (1), the stirring blade (41) is arranged along the flow direction of the gas, the stirring blade (41) is fixed with bristles (411) on the side close to the barrel (1), the bristles (411) are in contact with the inner wall of the barrel (1), the barrel (1) is provided with a cleaning groove (15) for storing particles, and the cleaning groove (15) is formed along the flow direction of the gas.

7. The device for filtering and purifying a nitric oxide mixed gas according to claim 6, characterized by: The barrel (1) is connected with a sealing door (16) at the manhole (11), the sealing door (16) is located at the side of the inspection door (12) close to the inside of the barrel (1), and the side of the sealing door (16) away from the inspection door (12) is flush with the inner wall of the barrel (1).

8. The device for filtering and purifying a nitric oxide mixed gas according to claim 6, wherein: The stirring blade (41) is wavy.

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