Filter element structure for purifying nitrogen oxide mixed gas

Abstract

The utility model relates to the technical field of gas treatment, in particular to a filter element structure for purifying nitrogen oxide mixed gas, one end of a barrel is a gas inlet end, the other end of the barrel is a gas outlet end, a connecting plate is connected in the barrel in the direction perpendicular to the axis of the barrel, and at least one connecting hole is formed in the connecting plate; comprising a mounting assembly and at least one filtering assembly, the mounting assembly comprises at least one mounting ring, and the mounting ring is coaxially located in a connecting hole; the filtering assembly comprises a filtering frame, a pre-filtering layer, a main filtering layer and a fine filtering layer, the filtering frame comprises a filtering ring and three ring frames, the three ring frames are coaxially located between the mounting ring and the filtering ring, the diameters of the three ring frames are gradually reduced towards the side close to the axis of the filtering ring, and the pre-filtering layer forms a pre-filtering cylinder arranged on the outermost ring frame in a sleeving mode; the main filter layer forms a main filter cartridge sleeved on the middle ring frame, and the fine filter layer forms a fine filter cartridge sleeved on the innermost ring frame; the filtering device has the effect of improving the filtering effect.

Description

TECHNICAL FIELD

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

[0002] In the production process of nitric acid, air and ammonia gas are catalytically combusted at a high temperature of 850-900 DEG C under a pressure of 0.35 MPa in an oxidation furnace through a catalytic net, and nitrogen oxides are generated, and a considerable amount of platinum gold fine particles are lost in the process pipeline with the high-temperature gas, the particles dust enters the absorption tower with the airflow, and is finally mixed into the finished product nitric acid, seriously affecting the quality of the product.

[0003] In the related art, the application file with the publication number CN206746201U discloses a filter purification device for nitrogen oxide mixed gas, the filter purification device for nitrogen oxide mixed gas includes a cylindrical shell and a plurality of filter core frames arranged in a circle along the inner wall of the shell, one end of the filter core frame is connected with a connecting plate, the shell includes a cylinder, two end covers symmetrically distributed along the cylinder, a manhole provided on the cylinder and in communication with the cylinder, and a device lifting lug provided above the cylinder, the filter core frame is arranged at the cylinder, the connecting plate is coincided with the center of the cylinder, and the dust can be intercepted in the filter through the filter core.

[0004] In the related art, the dust enters the dust filter, and the dust can be intercepted in the filter through the filter core, but the single ceramic fiber on the filter core may cause part of the dust to pass through the ceramic fiber, which is not filtered by the filter core, resulting in poor filtering effect. Utility model content

[0005] In order to improve the filtering effect, the application provides a filter core structure for purifying nitrogen oxide mixed gas.

[0006] The filter core structure for purifying nitrogen oxide mixed gas provided by the application adopts the following technical scheme:

[0007] A filter core structure for purifying nitrogen oxide mixed gas, the cylinder is hollow, one end of the cylinder connected with the nitric acid generating device is the air inlet end, the other end is the air outlet end, the connecting plate is connected in the cylinder along the direction perpendicular to the axis of the cylinder, at least one connecting hole is formed in the connecting plate, the installation assembly and at least one filter assembly are included, the installation assembly includes at least one installation ring, the installation ring is coaxially arranged in the connecting hole, and the installation ring is connected to the connecting plate.

[0008] The filter assembly comprises a filter frame, a pre-filter layer, a main filter layer and a fine filter layer, the filter frame comprises a filter ring and three ring frames, the filter ring is located on the side of the mounting ring close to the air inlet end, the mounting ring and the filter ring are distributed along the axis direction of the cylinder, the three ring frames are coaxially located between the mounting ring and the filter ring, the diameters of the three ring frames gradually decrease towards the side close to the axis of the filter ring, the filter gaps are left between the three ring frames, the two ends of the ring frame are fixed with the mounting ring and the filter ring respectively, the pre-filter layer forms a pre-filter cylinder sleeved on the outermost ring frame, the main filter layer forms a main filter cylinder sleeved on the middle ring frame, and the fine filter layer forms a fine filter cylinder sleeved on the innermost ring frame.

[0009] By adopting the above technical scheme, when the mixed gas needs to be treated, first, personnel install the filter assembly, then, when the nitrogen oxide gas flow containing dust enters the cylinder from the air inlet end, first, the pre-filter layer is encountered, large particle dust is intercepted at this stage, then the gas flow passes through the main filter layer, most of the dust particles are captured, finally, the gas flow reaches the fine filter layer, where finer particles can be removed, ensuring the purity of the gas; effective purification of the nitrogen oxide mixed gas is achieved; specifically: the combination of the mounting ring and the filter assembly enables the various filter layers to be effectively positioned and fixed, thereby improving the filtering efficiency; the multi-level design of the pre-filter layer, the main filter layer and the fine filter layer respectively intercepts dust of different particle sizes, greatly improving the filtering effect; the multi-ring frame structure of the filter frame and the filter gaps between the ring frames make the gas flow distribution more uniform, reducing the risk of excessive local pressure difference and prolonging the service life of the filter material; the modular design of the entire filter core structure facilitates maintenance and replacement, reducing operating costs.

[0010] In a specific implementable scheme, the pre-filter layer, the main filter layer and the fine filter layer all adopt a wavy folding structure.

[0011] By adopting the above technical scheme, the filtering area is significantly increased, and the filtering efficiency is improved. At the same time, this structure design can also effectively reduce the airflow resistance, ensure more uniform gas flow distribution, and avoid the risk of filter material damage due to excessive local pressure difference.

[0012] In a specific implementable scheme, an annular groove is formed on the side of the mounting ring close to the air inlet end and away from the axis of the mounting ring on each ring frame, three annular grooves are formed on the side of the filter ring close to the connecting plate, the annular grooves penetrate the filter ring along the axis direction of the filter ring, the annular grooves correspond to the annular grooves one by one, and an annular groove is formed on the outer wall of each ring frame for the sliding of the filter layer thereon, the sliding groove is arranged along the axis direction of the filter ring, and the sliding groove is in communication with the annular groove and the annular groove.

[0013] One side of the pre-filter layer is connected with a plurality of first sliding rods along the length direction of the side edge, one side of the main filter layer is connected with a plurality of second sliding rods along the length direction of the side edge, one side of the fine filter layer is connected with a plurality of third sliding rods along the length direction of the side edge, and the first sliding rods, the second sliding rods and the third sliding rods can be inserted into the corresponding ring grooves and slide along the setting direction of the ring grooves.

[0014] By adopting the above technical scheme, the installation structure of the pre-filter layer, the main filter layer and the fine filter layer is reasonable in design, and quick installation and disassembly can be realized. Specifically, the design of the ring groove, the ring groove and the sliding groove enables each filter layer to be conveniently installed on the corresponding ring frame through the sliding rod, and the sliding rod can slide in the ring groove, so that the filter layers are conveniently surrounded to form a filter cylinder, the filter layers are ensured to be tightly fitted to the ring frame, the filtering effect is improved, and at the same time, the modular design facilitates maintenance and replacement, and reduces the operation difficulty and cost.

[0015] In a specific implementable scheme, the filter assembly further comprises three connecting pieces, and the pre-filter layer, the main filter layer and the fine filter layer each correspond to one connecting piece. The connecting piece corresponding to the pre-filter layer is used to connect the pre-filter layer into a pre-filter cylinder, the connecting piece corresponding to the main filter layer is used to connect the main filter layer into a main filter cylinder, and the connecting piece corresponding to the fine filter layer is used to connect the fine filter layer into a fine filter cylinder.

[0016] By adopting the above technical scheme, the connecting piece is provided, so that the pre-filter layer, the main filter layer and the fine filter layer can form a pre-filter cylinder, a main filter cylinder and a fine filter cylinder respectively. This design facilitates the installation and replacement of the filter layers, improves the maintenance efficiency, and at the same time, the use of the connecting piece ensures the stability and reliability of each filter layer during the working process, avoiding the problem of filtering failure due to looseness.

[0017] In a specific implementable scheme, the filter assembly further comprises a fixing piece, the fixing piece comprises at least one fixing plate, the fixing plate corresponds to the connecting hole, the fixing plate is close to the filter ring, the fixing plate is detachably connected to one side of the filter ring close to the air inlet end, and one side of the pre-filter layer, the main filter layer and the fine filter layer away from the connecting plate abuts against the fixing plate.

[0018] By adopting the technical scheme, the fixing member enables the pre-filter layer, the main filter layer and the fine filter layer to be more stably installed in the filter assembly, preventing displacement or falling off due to airflow impact during use; meanwhile, the detachable connection between the fixing plate and the filter ring facilitates replacement and maintenance of the filter layer, prolonging the overall service life of the filter element; in addition, the presence of the fixing plate can further improve the sealing performance of the overall filter element structure, reducing the possibility of unfiltered gas passing directly through, thereby improving the overall filtering effect.

[0019] In a specific implementable embodiment, the mounting ring is detachably connected to the connecting plate.

[0020] The mounting assembly further comprises at least one mounting member corresponding to the mounting ring, the mounting member comprising two L-shaped plates and two first springs, the mounting ring having two placement grooves for the L-shaped plates, the two placement grooves being symmetrically arranged along the axis of the mounting ring, the L-shaped plates corresponding one-to-one to the placement grooves, the L-shaped plates being slidably connected to the mounting ring, the L-shaped plates moving towards or away from the axis of the mounting ring, the opening of the L-shaped plate facing away from the mounting ring, the first springs corresponding one-to-one to the L-shaped plates, the first springs being arranged in the same direction as the L-shaped plates, one end of the first spring being fixed to the mounting ring and the other end being fixed to one side of the L-shaped plate, the connecting plate having a insertion groove in the connecting hole for the L-shaped plate.

[0021] By adopting the technical scheme, the detachable connection between the mounting ring and the connecting plate and the structural design of the mounting member enable convenient mounting and maintenance of the filter element assembly, specifically, the combination of the L-shaped plate and the first spring not only ensures the stability of the mounting ring in the connecting hole, preventing it from loosening due to vibration or impact, but also enables easy removal of the mounting ring when it needs to be removed, thereby facilitating replacement and cleaning of the filter layer, which greatly reduces the cost and complexity of filter element maintenance and prolongs the overall service life of the filter element.

[0022] In a specific implementable embodiment, the longitudinal section of the ring groove is T-shaped.

[0023] The first slide rod, the second slide rod and the third slide rod are T-shaped at one end in the ring groove, and the first slide rod, the second slide rod and the third slide rod are in close contact with the side wall of the ring groove at one end in the ring groove, the first slide rod is rotatably connected with a first ball at both ends, the second slide rod is rotatably connected with a second ball at both ends, and the third slide rod is rotatably connected with a third ball at both ends, and the first ball, the second ball and the third ball can roll in the ring groove.

[0024] By adopting the above technical scheme, the longitudinal section of the ring groove is designed in a T shape, effectively preventing the first slide rod, the second slide rod and the third slide rod from falling off during installation, enhancing the stability of the connection, and at the same time, the first slide rod, the second slide rod and the third slide rod are also T-shaped at one end in the corresponding ring groove, in close contact with the side wall of the ring groove, further improving the stability and reliability of the structure; these balls can freely roll in the ring groove, significantly reducing the friction during sliding, making the installation and disassembly of the pre-filter layer, the main filter layer and the fine filter layer more convenient and efficient, and also prolonging the service life of the filter core.

[0025] In a specific implementation, the fixing plate is provided with a fixing groove on one side close to the filter ring for placing the filter ring, and the fixing plate and the filter ring are detachably connected through threaded connection.

[0026] By adopting the above technical scheme, the threaded connection between the fixing plate and the filter ring not only facilitates the installation and disassembly process, but also effectively ensures the stability of the connection between the two, preventing loosening due to vibration or other factors during use, and at the same time, the existence of the fixing groove makes the filter ring more accurately positioned during installation, reduces installation errors, and improves the reliability and maintenance convenience of the overall device.

[0027] In summary, the present application has at least one of the following beneficial technical effects:

[0028] 1. The designed filter core structure for purifying nitrogen oxide mixed gas realizes effective purification of nitrogen oxide mixed gas; specifically, the combination of the mounting ring and the filter assembly enables effective positioning and fixation of each filter layer, thereby improving the filtration efficiency; the multi-level design of the pre-filter layer, the main filter layer and the fine filter layer respectively intercepts dust of different particle sizes, greatly improving the filtration effect; the multi-ring structure of the filter frame and the filter gap between the ring frames make the airflow distribution more uniform, reducing the risk of excessive local pressure difference and prolonging the service life of the filter material; the modular design of the entire filter core structure facilitates maintenance and replacement, reducing operating costs.

[0029] 2. The filter core structure for purifying nitrogen oxide mixed gas is designed, which significantly increases the filtering area and improves the filtering efficiency. Meanwhile, the structure design can effectively reduce the airflow resistance and ensure more uniform airflow distribution, avoiding the risk of filter material damage caused by excessive local pressure difference.

[0030] 3. The filter core structure for purifying nitrogen oxide mixed gas is designed, and the installation structure of the pre-filter layer, the main filter layer, and the fine filter layer is reasonably designed, which can realize rapid installation and disassembly. This modular design facilitates maintenance and replacement, reducing the operation difficulty and cost. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 is the overall structure schematic diagram in the embodiment of the application.

[0032] Figure 2 is the cross-sectional view of the cylinder in the embodiment.

[0033] Figure 3 is the structure schematic diagram of the installation assembly and the filter assembly in the embodiment.

[0034] Figure 4 is the cross-sectional view of the filter assembly in the embodiment.

[0035] Figure 5 is Figure 4 the enlarged view of A in FIG. 1.

[0036] Figure 6 is the structure schematic diagram of the fixing member in the embodiment.

[0037] Figure 7 is Figure 6 the enlarged view of B in FIG. 1.

[0038] BRIEF DESCRIPTION OF DRAWINGS: 1, cylinder; 11, manhole; 12, inspection door; 13, connecting plate; 131, connecting hole; 132, insertion slot; 2, installation assembly; 21, installation ring; 211, placement slot; 212, ring slot; 22, installation member; 221, L-shaped plate; 222, first spring; 3, filter assembly; 31, filter frame; 311, filter ring; 3111, ring slot; 312, ring frame; 32, pre-filter layer; 321, first sliding rod; 3211, first ball; 33, main filter layer; 331, second sliding rod; 3311, second ball; 34, fine filter layer; 341, third sliding rod; 3411, third ball; 35, connecting member; 351, insertion plate; 3511, connecting rod; 3512, connecting slot; 36, fixing member; 361, fixing plate; 3611, fixing slot. DETAILED DESCRIPTION

[0039] The application will be further described in detail below. Figures 1-7 The application will be further described in detail below.

[0040] The embodiment of the present application discloses a filter core structure for purifying nitrogen oxide mixed gas.

[0041] With reference to Figure 1 and Figure 2 A filter core structure for purifying nitrogen oxide mixed gas comprises a mounting assembly 2 and at least one filter assembly 3, and the mounting assembly 2 and the filter assembly 3 are arranged on a cylinder body 1.

[0042] With reference to Figure 1 The cylinder body 1 is hollow, both ends of the cylinder body 1 are provided with a necked portion, one end of the cylinder body 1 is provided with an air inlet end, and the other end is provided with 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 the cylinder body 1; the air outlet end is connected with a next process device, and is used for discharging the treated nitrogen oxide mixed gas; a manhole 11 for personnel to pass through is arranged on the side wall of the cylinder body 1; an inspection door 12 is arranged on the manhole 11 of the cylinder body 1; the inspection door 12 is detachably connected with the cylinder body 1 through a quick-release switch; and a sealing ring is fixedly bonded in the circumferential direction of the inspection door 12, so that the connecting position of the inspection door 12 and the cylinder body 1 can be sealed.

[0043] With reference to Figure 1 , Figure 2 and Figure 3The mounting assembly 2 is located in the cylinder body 1, the cylinder body 1 is provided with a connecting plate 13, the setting direction of the connecting plate 13 is perpendicular to the axial direction of the cylinder body 1, the connecting plate 13 is welded to the inner wall of the cylinder body 1, the connecting plate 13 is provided with at least one connecting hole 131, the connecting hole 131 penetrates the connecting plate 13 along the thickness direction of the connecting plate 13, the manhole 11 is located on the side of the connecting plate 13 close to the air inlet end, in the embodiment, the connecting hole 131 is five, one of the connecting holes 131 on the connecting plate 13 is at the center of the connecting hole 131, and the remaining connecting holes 131 are distributed in a ring shape, the mounting assembly 2 comprises at least one mounting ring 21 and at least one mounting piece 22, in the embodiment, the number of the mounting rings 21 is five, the mounting ring 21 corresponds to the connecting hole 131 one by one, the mounting ring 21 is located in the connecting hole 131, and the mounting ring 21 is coaxially arranged with the connecting hole 131, the mounting piece 22 corresponds to the mounting ring 21 one by one, the mounting piece 22 comprises two L-shaped plates 221 and two first springs 222, the outer wall of the mounting ring 21 is provided with two placing grooves 211 for placing the L-shaped plates 221, and the two placing grooves 211 are symmetrically arranged along the axial direction of the mounting ring 21, the L-shaped plate 221 corresponds to the placing groove 211 one by one, the L-shaped plate 221 is slidingly connected to the mounting ring 21, and the L-shaped plate 221 moves towards or away from the axial direction of the mounting ring 21, the opening of the L-shaped plate 221 faces away from the mounting ring 21, the first spring 222 corresponds to the L-shaped plate 221 one by one, the setting direction of the first spring 222 is consistent with the movement direction of the L-shaped plate 221, one end of the first spring 222 is welded to the mounting ring 21, and the other end is welded to one side of the L-shaped plate 221, in the embodiment, the first spring 222 is a compression spring, the connecting plate 13 is provided with a plug-in groove 132 in the connecting hole 131 for inserting the L-shaped plate 221, when the L-shaped plate 221 is inserted into the plug-in groove 132, the mounting ring 21 is matched with the connecting hole 131, the mounting ring 21 is fixed with the connecting plate 13, and the connecting position of the mounting ring 21 and the connecting plate 13 is sealed by a sealing gasket.

[0044] Referring to Figure 2 , Figure 4 and Figure 5In the embodiment, the number of the filter assemblies 3 is five, the five filter assemblies 3 are located in the cylinder body 1, and the five filter assemblies 3 are located on the side of the connecting plate 13 close to the air inlet end, the filter assembly 3 corresponds to the connecting hole 131 one by one, the filter assembly 3 comprises a filter frame 31, a pre-filter layer 32, a main filter layer 33 and a fine filter layer 34, the filter frame 31 comprises a filter ring 311 and three ring frames 312, the filter ring 311 is located on the side of the mounting ring 21 close to the air inlet end, and the mounting ring 21 and the filter ring 311 are distributed along the axis direction of the cylinder body 1, the three ring frames 312 are located between the mounting ring 21 and the filter ring 311, and the three ring frames 312 are coaxially arranged with the filter ring 311, the diameters of the three ring frames 312 gradually decrease towards the side close to the axis of the filter ring 311, the filter gaps are left between the three ring frames 312, the two ends of the ring frame 312 are welded with the mounting ring 21 and the filter ring 311 respectively, the mounting ring 21 is provided with one ring groove 212 on the side of each ring frame 312 away from the axis of the mounting ring 21 close to the air inlet end, the filter ring 311 is provided with three annular grooves 3111 on the side close to the connecting plate 13, the annular grooves 3111 penetrate through the filter ring 311 along the axis direction of the filter ring 311, and the annular grooves 3111 correspond to the ring grooves 212 one by one, in the embodiment, the longitudinal section of the ring groove 212 is T-shaped.

[0045] With reference to Figure 2 , Figure 4 and Figure 5, the pre-filter layer 32 is adjacent to the outermost ring frame 312, the main filter layer 33 is adjacent to the middle ring frame 312, and the fine filter layer 34 is adjacent to the innermost ring frame 312; the pre-filter layer 32, the main filter layer 33 and the fine filter layer 34 all adopt a wave-shaped folding structure, so as to increase the filtering area and improve the filtering efficiency; each outer wall of the ring frame 312 is provided with a sliding groove for sliding of the filtering layer thereon, the sliding groove is arranged along the axis direction of the filtering ring 311, and the sliding groove is in communication with the annular groove 212 and the annular groove 3111; the pre-filter layer 32 is capable of extending into the sliding groove at the side close to the sliding groove, and the pre-filter layer 32 is provided with a plurality of first sliding rods 321 at one side thereof; the first sliding rods 321 are welded to the pre-filter layer 32; the plurality of first sliding rods 321 are spaced apart along the length direction of the side of the pre-filter layer 32 where the first sliding rods 321 are located; similarly, the main filter layer 33 is welded with a plurality of second sliding rods 331 at one side thereof, and the fine filter layer 34 is welded with a plurality of third sliding rods 341 at one side thereof; the first sliding rods 321, the second sliding rods 331 and the third sliding rods 341 are all capable of being inserted into the corresponding annular groove 212; the ends of the first sliding rods 321, the second sliding rods 331 and the third sliding rods 341 located in the corresponding annular groove 212 are all in T shape and are in abutment with the side wall of the annular groove 212; the first sliding rods 321, the second sliding rods 331 and the third sliding rods 341 are capable of sliding in the corresponding annular groove 212 along the arrangement direction of the annular groove 212; the first sliding rods 321 are each rotatably connected with a first ball 3211 at two ends thereof, the first ball 3211 is capable of rolling in the annular groove 212; similarly, the second sliding rods 331 are each rotatably connected with a second ball 3311 at two ends thereof, and the third sliding rods 341 are each rotatably connected with a third ball 3411 at two ends thereof; when the pre-filter layer 32 needs to be installed, the pre-filter layer 32 is extended into the sliding groove through the annular groove 3111 at one side thereof; the pre-filter layer 32 is pushed so that the first sliding rods 321 are located in the annular groove 212; the pre-filter layer 32 is pulled at two sides thereof so that the first sliding rods 321 slide in the annular groove 212 until the pre-filter layer 32 is connected to form a pre-filter cylinder; similarly, the main filter layer 33 forms a main filter cylinder, and the fine filter layer 34 forms a fine filter cylinder.

[0046] With reference to Figure 2 , Figure 4 and Figure 5 , the pre-filter layer 32 is composed of a metal wire mesh with a coarse pore size, mainly used for intercepting larger size dust particles; the main filter layer 33 adopts a high-temperature-resistant and high-density ceramic fiber, having good dust capturing performance and low airflow resistance; the fine filter layer 34 is composed of superfine glass fiber, used for further removing small particles to ensure that the finally discharged gas meets high standard requirements; in the whole process, the design of the pre-filter layer 32, the main filter layer 33 and the fine filter layer 34 makes the airflow distribution uniform, avoiding the risk of filter damage caused by excessive local pressure difference.

[0047] With reference to Figure 4 , Figure 6 and Figure 7 , the filter assembly 3 further comprises three connecting pieces 35 and a fixing piece 36, the pre-filter layer 32, the main filter layer 33 and the fine filter layer 34 are each corresponding to one connecting piece 35, the connecting piece 35 comprises two plug-in plates 351, for the convenience of description, the pre-filter layer 32 is selected for description, the two plug-in plates 351 are each close to the two sides of the pre-filter layer 32 opposite to each other, the plug-in plate 351 is arranged along the axis direction of the filter ring 311, and the plug-in plate 351 is welded to the pre-filter layer 32. A plurality of connecting rods 3511 are arranged on one of the plug-in plates 351 along the arrangement direction thereof, and a plurality of connecting grooves 3512 for the connecting rods 3511 to be inserted are arranged on the other plug-in plate 351 in a corresponding manner. The connecting rod 3511 is in interference fit with the connecting groove 3512, so that the two sides of the pre-filter layer 32 opposite to each other can be fixed, and the pre-filter layer 32 forms a pre-filter cylinder. A sealing strip is arranged between the two plug-in plates 351, so that the connecting portion of the two plug-in plates 351 can be sealed.

[0048] With reference to Figure 4 and Figure 6 , the fixing piece 36 comprises a fixing plate 361, the fixing plate 361 corresponds to the connecting holes 131 one by one, the fixing plate 361 is located on the side of the filter ring 311 close to the air inlet end, the fixing plate 361 is provided with a fixing groove 3611 close to the side of the filter ring 311 for placing the filter ring 311, and the fixing plate 361 is detachably connected with the filter ring 311 in a threaded connection manner. The pre-filter layer 32, the main filter layer 33 and the fine filter layer 34 are all abutted against the fixing plate 361 on the side close to the filter ring 311.

[0049] The implementation principle of the filter core structure for purifying the mixed gas of nitrogen oxides is as follows: when the mixed gas needs to be treated, first, personnel install the filter assembly 3, then, the mixed gas is introduced into the cylinder body 1, and the pre-filter layer 32, the main filter layer 33 and the fine filter layer 34 in the filter assembly 3 filter the mixed gas step by step, and the filtered mixed gas is discharged through the air outlet end.

[0050] When the nitrogen oxide gas flow containing dust enters the cylinder body 1 from the air inlet end, it first encounters the pre-filter layer 32, large-particle dust is intercepted at this stage, then the gas flow passes through the main filter layer 33, most of the dust particles are captured, and finally, the gas flow reaches the fine filter layer 34, where finer particles can be removed to ensure the purity of the gas.

[0051] When the pre-filter layer 32, the main filter layer 33 and the fine filter layer 34 need to be replaced, the personnel enter the cylinder 1 through the manhole 11, separate the filter ring 311 from the connecting plate 13 through the mounting piece 22, then the personnel take out the filter ring 311, and take down the pre-filter layer 32 or the main filter layer 33 or the fine filter layer 34 outside the ring frame 312, separate the two plug-in plates 351, and push the pre-filter layer 32 or the main filter layer 33 or the fine filter layer 34 to fold, and then take out the pre-filter layer 32 or the main filter layer 33 or the fine filter layer 34 through the sliding groove by the personnel observation, and install the new pre-filter layer 32 or the main filter layer 33 or the fine filter layer 34 according to the reverse operation.

[0052] The above are preferred embodiments of the present application, and are not intended to limit the protection scope of the present application, therefore: any equivalent changes made according to the structure, shape, principle of the present application should be covered within the protection scope of the present application.

Claims

1. A filter core structure for purifying nitrogen oxide mixed gas, a cylinder (1) is hollowly arranged, one end of the cylinder (1) connected with a nitric acid generating device is an air inlet end, and the other end is an air outlet end, a connecting plate (13) is connected in the cylinder (1) along a direction perpendicular to an axis of the cylinder (1), and at least one connecting hole (131) is formed in the connecting plate (13), characterized in that: The installation assembly (2) comprises at least one installation ring (21) coaxially located in the connecting hole (131), and the installation ring (21) is connected to the connecting plate (13); ​ The filter assembly (3) comprises a filter frame (31), a pre-filter layer (32), a main filter layer (33) and a fine filter layer (34). The filter frame (31) comprises a filter ring (311) and three ring frames (312). The filter ring (311) is located on the side of the installation ring (21) close to the air inlet end. The installation ring (21) and the filter ring (311) are distributed along the axis direction of the cylinder (1). The three ring frames (312) are coaxially located between the installation ring (21) and the filter ring (311). The diameters of the three ring frames (312) gradually decrease towards the axis of the filter ring (311). The filter gaps are left between the three ring frames (312). The two ends of the ring frame (312) are fixed with the installation ring (21) and the filter ring (311) respectively. The pre-filter layer (32) forms a pre-filter cylinder sleeved on the outermost ring frame (312). The main filter layer (33) forms a main filter cylinder sleeved on the middle ring frame (312). The fine filter layer (34) forms a fine filter cylinder sleeved on the innermost ring frame (312).

2. The filter element structure for purifying a nitrogen oxide mixture gas according to claim 1, wherein: The pre-filter layer (32), the main filter layer (33) and the fine filter layer (34) all adopt a wavy folding structure.

3. The filter element structure for purifying a nitrogen oxide mixture gas according to claim 2, wherein: An annular groove (212) is formed on the side of the installation ring (21) close to the air inlet end and away from the axis of the installation ring (21) of each ring frame (312). Three annular grooves (3111) are formed on the side of the filter ring (311) close to the connecting plate (13). The annular grooves (3111) penetrate through the filter ring (311) along the axis direction of the filter ring (311). The annular grooves (3111) correspond to the annular grooves (212) one by one. An annular groove (212) is formed on the outer wall of each ring frame (312) for the sliding of the filter layer thereon. The annular groove (212) is arranged along the axis direction of the filter ring (311) and is in communication with the annular grooves (212) and the annular grooves (3111). A plurality of first sliding rods (321) are connected to one side of the pre-filter layer (32) along the length direction of the side edge. A plurality of second sliding rods (331) are connected to one side of the main filter layer (33) along the length direction of the side edge. A plurality of third sliding rods (341) are connected to one side of the fine filter layer (34) along the length direction of the side edge. The first sliding rods (321), the second sliding rods (331) and the third sliding rods (341) can be inserted into the corresponding annular grooves (212) and slide along the arrangement direction of the annular grooves (212).

4. The filter element structure for purifying a nitrogen oxide mixture gas according to claim 3, wherein: The filter assembly (3) further comprises three connecting pieces (35), one of which corresponds to the pre-filter layer (32), the main filter layer (33) and the fine filter layer (34) respectively, the connecting piece (35) corresponding to the pre-filter layer (32) is used for connecting the pre-filter layer (32) into a pre-filter cylinder, the connecting piece (35) corresponding to the main filter layer (33) is used for connecting the main filter layer (33) into a main filter cylinder, and the connecting piece (35) corresponding to the fine filter layer (34) is used for connecting the fine filter layer (34) into a fine filter cylinder.

5. The filter element structure for purifying nitrogen oxide mixed gas according to claim 3, wherein: The filter assembly (3) further comprises a fixing piece (36), the fixing piece (36) comprises at least one fixing plate (361), the fixing plate (361) corresponds to the connecting hole (131), the fixing plate (361) is close to the filter ring (311), and the fixing plate (361) is detachably connected to one side of the filter ring (311) close to the air inlet end.

6. The filter element structure for purifying nitrogen oxide mixed gas according to claim 1, wherein: The mounting ring (21) is detachably connected to the connecting plate (13); The mounting assembly (2) further comprises at least one mounting piece (22), the mounting piece (22) corresponds to the mounting ring (21), the mounting piece (22) comprises two L-shaped plates (221) and two first springs (222), the mounting ring (21) is provided with two placing grooves (211) for placing the L-shaped plates (221), the two placing grooves (211) are symmetrically arranged along the axis direction of the mounting ring (21), the L-shaped plates (221) correspond to the placing grooves (211) one by one, the L-shaped plates (221) are slidably connected to the mounting ring (21), the L-shaped plates (221) move towards or away from the axis direction of the mounting ring (21), the opening of the L-shaped plates (221) faces away from the mounting ring (21), the first springs (222) correspond to the L-shaped plates (221) one by one, the setting direction of the first springs (222) is consistent with the movement direction of the L-shaped plates (221), one end of the first spring (222) is fixed to the mounting ring (21), and the other end is fixed to one side of the L-shaped plate (221), and the connecting plate (13) is provided with an insertion groove (132) for inserting the L-shaped plate (221) in the connecting hole (131).

7. The filter element structure for purifying nitrogen oxide mixed gas according to claim 3, wherein: The longitudinal section of the ring groove (212) is T-shaped; The first slide rod (321), the second slide rod (331) and the third slide rod (341) are T-shaped at one end in the ring groove (212), and the first slide rod (321), the second slide rod (331) and the third slide rod (341) are in close contact with the side wall of the ring groove (212) at one end in the ring groove (212), and the first slide rod (321) is rotatably connected with a first ball (3211) at both ends, the second slide rod (331) is rotatably connected with a second ball (3311) at both ends, and the third slide rod (341) is rotatably connected with a third ball (3411) at both ends, and the first ball (3211), the second ball (3311) and the third ball (3411) can roll in the ring groove (212).

8. The filter element structure for purifying nitrogen oxide mixed gas according to claim 5, wherein: The fixed plate (361) is provided with a fixed groove (3611) for placing the filter ring (311) on the side close to the filter ring (311), and the fixed plate (361) and the filter ring (311) are detachably connected by threaded connection.

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