Air filtering equipment for retarding corrosion of steel structure for steel structure industrial factory building

Abstract

An air filtering device for slowing down corrosion of a steel structure for a steel structure industrial factory building is characterized in that an upper tooth groove is formed in the upper wall of a cylinder frame and meshed with a gear column, and the gear column is connected with a rotating rod and a driving motor. The outer wall of the gear column is meshed with an outer gear ring, and an upper blade ring is fixed to the outer gear ring and rotationally connected with the interior of the shell. A lower tooth groove is formed in the lower wall of the cylinder frame and meshed with a lower blade ring, the lower blade ring is rotationally connected with a dehumidification groove, and the dehumidification groove is located below the conical column. The circle centers of the upper leaf ring and the lower leaf ring coincide, the acid mist adsorption layers are arranged above and below the upper leaf ring, the lower acid mist adsorption layer is fixed at the bottom end of the lower leaf ring, the upper acid mist adsorption layer is fixed at the top end of the upper leaf ring, two sides of the upper acid mist adsorption layer are connected with the salt mist neutralization assembly, and the bottom end of the lower acid mist adsorption layer is also connected with the salt mist neutralization assembly. The outer side of the salt mist neutralization assembly is connected with a tail end filter screen, the outer wall of the tail end filter screen is fixedly connected with air outlets, and the upper section and the lower section of the shell are each provided with an air outlet. The technical problem that corrosion of air to a steel structure material cannot be effectively relieved is solved.

Description

Technical Field

[0001] The present invention belongs to the technical field of air filtration, and relates to an air filtration device for slowing down the corrosion of steel structures in steel structure industrial plants. Background Art

[0002] Steel structures are used in building construction in the construction field. A steel structure is a structure composed of steel materials and is one of the main building structure types. A steel structure is mainly composed of components such as steel beams, steel columns, and steel trusses made of section steel and steel plates. The waterproof and corrosion resistance ability of a steel structure is usually weak. A steel structure is prone to rust and corrosion when it comes into contact with moisture. The corrosion of a steel structure easily affects the overall stability of the steel structure. Currently, in order to improve the corrosion resistance of steel structure parts, zinc spraying and aluminum spraying coatings are usually used for protection.

[0003] After retrieval, for example, a Chinese patent document discloses a salt spray purification intelligent anti-corrosion device [Application No.: CN201820968624.6. Publication No.: CN208458339U]. It includes an air treatment air duct and a regeneration air duct. A first coarse filter, a salt spray filter, a front surface cooler, a dehumidification module, a rear surface cooler, and a ventilator are sequentially arranged between the air inlet and the air outlet of the air treatment air duct. The intelligent anti-corrosion device further includes an air corrosion monitor, a PLC control unit, and a temperature and humidity sensor assembly. The air corrosion monitor is used to monitor the air corrosion rate and corrosion amount and feedback the monitored information to the PLC control unit, and then the PLC control unit controls the intelligent operation of the device.

[0004] Although the salt spray purification intelligent anti-corrosion device disclosed in this patent can change the microenvironment in existing offshore wind turbine nacelles, etc., and can reduce the corrosion of equipment in the nacelle, however, this anti-corrosion device filters the salt spray box moisture in the air through a filtration module and a dehumidification module, and does not disclose the specific structure for filtering salt spray. Moreover, only the blockage condition of the salt spray filter can be detected through a differential pressure sensor, and it is impossible to achieve the efficient filtration and filtration recovery of salt spray in the air by the salt spray filter. Summary of the Invention

[0005] The purpose of the present invention is to address the above problems existing in the prior art and propose an air filtration device for slowing down the corrosion of steel structures in steel structure industrial plants. The technical problem to be solved by this invention is: how to synchronously and efficiently achieve the effects of dehumidifying, removing acid mist, and removing salt spray in the air, and slow down the corrosion of air on steel structure materials.

[0006] The purpose of the present invention can be achieved by the following technical solutions: An air filtration device for slowing down the corrosion of steel structures in an industrial steel structure factory building, including a housing, and a cylinder frame is rotatably connected to the inner wall of the middle section of the housing. The cylinder frame coincides with the center of the housing. A coarse activated carbon layer is fixedly connected to the inner wall of the cylinder frame, and a graphene electrothermal film is fixedly installed on the other side of the coarse activated carbon layer. A fine activated carbon layer is fixedly installed on the side of the graphene electrothermal film away from the coarse activated carbon layer, and a HEPA filter membrane is fixedly installed on the inner wall of the fine activated carbon layer. A plurality of continuously arranged conical columns are fixedly connected to the inner wall of the HEPA filter membrane.

[0007] The inner upper wall of the cylinder frame is fixedly connected with an upper tooth groove, and a gear column is meshed with the inner wall of the upper tooth groove. A rotating rod is fixedly connected to the inside of the gear column, and the rotating rod is rotatably connected inside the housing and is driven by a driving motor. The outer wall of the gear column is meshed with an outer tooth ring, and an upper blade ring is fixedly connected to the inner wall of the outer tooth ring. The upper blade ring is rotatably connected inside the housing, and the center of the upper blade ring coincides with the center of the cylinder frame.

[0008] The inner lower wall of the cylinder frame is fixedly connected with a lower tooth groove, and a lower blade ring is meshed with the inner wall of the lower tooth groove. A dehumidification groove is rotatably connected to the outer wall of the lower blade ring, and the dehumidification groove is located below the conical column.

[0009] The upper blade ring and the lower blade ring are respectively located above and below the inside of the cylinder frame, and the centers of the upper blade ring and the lower blade ring coincide.

[0010] Acid mist adsorption layers are provided above the upper blade ring and below the lower blade ring. The lower acid mist adsorption layer is fixedly installed at the bottom end of the lower blade ring, and the upper acid mist adsorption layer is fixedly connected to the middle of the top end of the upper blade ring. Salt mist neutralization components are connected to both sides of the upper acid mist adsorption layer, and salt mist neutralization components are connected to the bottom end of the lower acid mist adsorption layer.

[0011] The outer sides of the salt mist neutralization components are all connected with end filters, and an air outlet is fixedly connected to the outer wall of the end filter. Air outlets are provided in both the upper and lower sections of the housing.

[0012] In the present invention, during air treatment, external air enters from the middle section of the housing through the air inlet. Under the action of the rotating drum frame disposed in the middle section of the housing, when the driving motor is powered on, the rotating rod drives the gear column to rotate. Under the action of the upper tooth groove meshing and rotating on the outer wall of the gear column, the drum frame rotates stably inside the housing. At the same time, by meshing and rotating the upper vane ring on the outer wall of the gear column, the upper vane ring rotates synchronously under the action of the gear column, facilitating the air guiding treatment of the upper vane ring above the housing. At the same time, under the action of the lower vane ring meshing and connecting below the drum frame, the drum frame drives the lower vane ring to rotate through meshing synchronization. Under the action of the same-direction rotation of the drum frame, through the setting of the upper gear column above, the upper vane ring and the lower vane ring rotate in opposite directions, causing the air in the middle section of the housing to be guided upward and downward respectively. Moreover, by fixedly connecting a coarse activated carbon layer and a fine activated carbon layer to the inner wall of the drum frame, the particulate matter in the air is efficiently filtered. And by arranging a graphene electrothermal film between the two activated carbon layers, the dehumidification effect inside the drum frame is improved, which is beneficial to reducing the moisture in the air. And by arranging the graphene electrothermal film between the two activated carbon layers, the graphene electrothermal film can rehabilitate the activated carbon on both sides by heating, improving the service life and purification efficiency of the activated carbon layer. And under the action of the HEPA filter membrane, it is convenient to filter tiny particulate matter. After the air is treated in the middle section of the housing, through the upward or downward movement of the upper vane ring and the lower vane ring, under the action of the acid mist adsorption layer, the porous ceramic filter layer can well adsorb the acid mist through the mesoporous structure. And under the action of setting a polyethyleneimine coating on the surface of the porous ceramic filter layer, the chemical adsorption effect on the acid mist is improved, ensuring the filtering effect of the acid mist. At the same time, under the action of the salt mist neutralization component, through the setting of two kinds of exchange resins, the sodium ions, metal cations, chloride ions and acidic anions in the salt mist are effectively captured and adsorbed, efficiently and stably reducing the salt content in the air and avoiding the corrosion of the steel structure caused by the salt content in the air. And by arranging a terminal filter screen inside the air outlet, under the action of the terminal filter screen using amino-functionalized polyacrylonitrile fibers, the air is dehumidified for the second time before being discharged, ensuring the filtering effect of the air.

[0013] The drum frame and the conical columns are both made of polytetrafluoroethylene, and the conical columns are unequal-diameter inclined cones with a large upper part and a tapered lower part, and a plurality of conical columns are continuously arranged in a ring on the inner wall of the HEPA filter membrane.

[0014] With the above structure, through the setting of the conical column, under the action of the unequal diameters of the conical column with a larger upper part and a tapered lower part, the air passes through the conical column for dehumidification and filtration. Under the action of the inclined cone, the contact efficiency between the air and the conical column is improved, and it is convenient for the moisture to flow down on the surface of the conical column. At the same time, through the setting of the HEPA filter membrane, the overall filtration effect of the filtration equipment on the tiny filter substances in the air is ensured, the purification efficiency of the air is ensured, and the burden on the subsequent air treatment components is reduced, which is beneficial to extending the service life of the air filtration equipment.

[0015] The top end of the upper vane ring is fixedly connected with a slider, and the top end of the slider is slidably connected with a housing.

[0016] Sliding rings are fixedly connected to both the upper and lower ends of the barrel frame, and the outer wall of the sliding ring is slidably connected with a housing.

[0017] The output end of the driving motor is fixedly connected to the top end of the rotating rod, and the driving motor is fixedly installed inside the housing.

[0018] With the above structure, through the setting of the slider, the upper vane ring can rotate stably inside the housing when driven to rotate, ensuring the working effect of the upper vane ring. At the same time, by setting sliding rings at the upper and lower ends of the barrel frame, the transmission effect of the barrel frame inside the housing is ensured, facilitating the barrel frame to synchronously drive the upper vane ring and the lower vane ring to rotate in opposite directions when rotating. Through such a setting, the air can enter through the middle section, and after being processed, it exits through the upper and lower parts, ensuring the air outlet efficiency of the filtration equipment, and at the same time facilitating the agitation of the air inside the environment and facilitating the filtration and purification of the air over a large area.

[0019] An air inlet is arranged on the outer side of the barrel frame, and the air inlet is opened in the middle section of the housing.

[0020] The dehumidification tank is of an annular structure, an opening is provided at the top of the dehumidification tank, and drain pipes are fixedly connected to both outer walls of the dehumidification tank, and the outlet ends of the drain pipes are located outside the housing.

[0021] A liquid receiving tank is fixedly connected to the inner bottom wall of the housing. The liquid receiving tank is located at the bottom end of the lower salt mist neutralization component, and a drain pipe is fixedly connected to the outer wall of the liquid receiving tank, and the water outlet end of the drain pipe is located outside the housing.

[0022] With the above structure, through the setting of the dehumidification tank, the dehumidified moisture is collected at the bottom end of the conical column by the dehumidification tank, and under the action of the drain pipe, it is convenient for users to maintain and service the equipment. At the same time, by setting a liquid receiving tank at the bottom of the equipment, the liquid receiving tank can collect the pure water generated by the neutralization of the salt mist neutralization component below, avoiding the influence of excessive moisture content inside the housing on the filtration performance of the components.

[0023] The salt spray neutralization component includes a stainless-steel skeleton, which is fixedly installed outside the acid mist adsorption layer. Inside the stainless-steel skeleton, quaternary ammonium group strongly basic resin and sulfonic acid group strongly acidic resin are filled in a staggered manner left and right, and multiple layers of quaternary ammonium group strongly basic resin and sulfonic acid group strongly acidic resin are filled in a staggered manner up and down.

[0024] The outer wall of the stainless-steel skeleton is fixedly connected with a polyvinylidene fluoride membrane.

[0025] The bottom end of the upper salt spray neutralization component is fixedly connected with a water receiving tank. The water receiving tank is annularly sleeved outside the acid mist adsorption layer, and water outlet pipes are fixedly connected to both sides of the water receiving tank.

[0026] With the above structure, the stainless-steel skeleton is made of stainless steel, which has good corrosion resistance, can intercept particulate matter, has a certain air purification effect, and under the action of the quaternary ammonium group strongly basic resin and sulfonic acid group strongly acidic resin, through the quaternary ammonium group anion resin and sulfonic acid group strongly acidic cation resin, under the action of the exchange resin, the sodium ions, metal cations, chloride ions and acidic anions in the salt spray are effectively captured and adsorbed, efficiently and stably reducing the salt content in the air. And through the staggered arrangement of the quaternary ammonium group strongly basic resin and sulfonic acid group strongly acidic resin up and down and left and right, the contact area between the exchange resin and the air is increased, and at the same time, ion leakage is avoided through mixed filtration, ensuring the filtration efficiency.

[0027] Compared with the prior art, the air filtration device for slowing down the corrosion of steel structures in steel structure industrial plants of the present invention has the following advantages: 1. In the present invention, through the different structural settings of multiple filtration units, synchronous and efficient dehumidification, acid mist removal and salt spray removal of air are realized, enabling the efficient removal of chloride ions and sodium ions in the air, greatly reducing the salt content and moisture at the air terminal, avoiding the corrosion caused by acid mist, salt spray and moisture contacting the steel structure, being beneficial to slowing down the corrosion rate of steel structure materials, improving the overall stability of the steel structure, and having a simple structure.

[0028] 2. In the present invention, under the action of the lower leaf ring meshed and arranged below the cylinder frame, and through the meshed connection of the gear column on the inner wall of the cylinder frame, and through the meshed connection of the gear column and the upper leaf ring, when the cylinder frame rotates, the upper leaf ring and the lower leaf ring rotate in the same reverse direction synchronously, enabling the air to be shunted up and down after entering the middle section of the housing, being beneficial to improving the air filtration efficiency of the device. And at the same time, through the rotation of the cylinder frame, the dehumidification effect inside the cylinder frame is better, facilitating the downward movement of the moisture in the air during rotation, being beneficial to improving the dehumidification efficiency and dehumidification quality of the device, and having good transmission performance.

[0029] 3. In the present invention, by arranging a graphene electrothermal film between two layers of activated carbon layers, the dehumidification effect inside the cylinder rack is improved, which is beneficial to reducing the moisture in the air. And by arranging the graphene electrothermal film between two layers of activated carbon layers, the graphene electrothermal film can rehabilitate the activated carbon on both sides by heating, improving the service life and purification efficiency of the activated carbon layer, facilitating the maintenance of the activated carbon, and reducing the usage cost.

[0030] 4. In the present invention, through the setting of the salt spray neutralization component and the setting of two kinds of ion exchange resins, the sodium ions, metal cations, chloride ions and acidic anions in the salt spray are effectively captured and adsorbed, efficiently and stably reducing the salt content in the air, effectively avoiding the corrosion of the steel structure caused by the salt in the air, greatly slowing down the corrosion rate of the steel structure material, and reducing the maintenance cost of the steel structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 is a schematic structural diagram of the air filtration device in the present invention.

[0032] Figure 2 is a schematic cross-sectional structural diagram of the air filtration device in the present invention.

[0033] Figure 3 is in the present invention Figure 3 an enlarged schematic structural diagram of part A.

[0034] Figure 4 is a schematic cross-sectional structural diagram of the cylinder rack in the present invention.

[0035] Figure 5 is a schematic cross-sectional structural diagram of the conical column in the present invention.

[0036] Figure 6 is a schematic structural diagram of the dehumidification tank in the present invention.

[0037] Figure 7 is a schematic cross-sectional structural diagram of the dehumidification tank in the present invention.

[0038] Figure 8 is a schematic cross-sectional structural diagram of the salt spray neutralization component in the present invention.

[0039] Figure 9 is a flow chart of the air purification method in the present invention.

[0040] In the figure, 1 is the housing; 2 is the cylinder frame; 3 is the coarse activated carbon layer; 4 is the graphene electric heating film; 5 is the fine activated carbon layer; 6 is the HEPA filter membrane; 7 is the conical column; 8 is the upper tooth groove; 9 is the gear column; 10 is the rotating rod; 11 is the driving motor; 12 is the external tooth ring; 13 is the upper blade ring; 14 is the slider; 15 is the lower tooth groove; 16 is the lower blade ring; 17 is the dehumidification tank; 18 is the drain pipe; 19 is the air inlet; 20 is the slip ring; 21 is the acid mist adsorption layer; 22 is the stainless steel skeleton; 23 is the quaternary ammonium group strongly basic resin; 24 is the sulfonic acid group strongly acidic resin; 25 is the polyvinylidene fluoride membrane; 26 is the end filter screen; 27 is the air outlet; 28 is the liquid receiving tank; 29 is the drain pipe; 30 is the water receiving tank. Detailed implementation mode

[0041] The following are specific embodiments of the present invention and in combination with the accompanying drawings, the technical solutions of the present invention will be further described, but the present invention is not limited to these embodiments. Embodiment 1

[0042] An air filtration device for slowing down the corrosion of steel structures in steel structure industrial plants. A cylinder frame 2 is arranged in the middle section of the housing 1. An air inlet 19 is arranged outside the cylinder frame 2. The air inlet 19 is opened in the middle section of the housing 1. The cylinder frame 2 coincides with the center of the housing 1. The inner wall of the cylinder frame 2 is fixedly connected with a coarse activated carbon layer 3, and on the other side of the coarse activated carbon layer 3, a graphene electric heating film 4 is fixedly installed. On the side of the graphene electric heating film 4 away from the coarse activated carbon layer 3, a fine activated carbon layer 5 is fixedly installed, and the inner wall of the fine activated carbon layer 5 is fixedly installed with a HEPA filter membrane 6. The inner wall of the HEPA filter membrane 6 is fixedly connected with a plurality of continuously arranged diversion columns. The cylinder frame 2 and the diversion columns are both made of polytetrafluoroethylene, and the diversion columns are semi-cylindrical columns with equal diameters up and down. And a plurality of diversion columns are continuously arranged in a ring on the inner wall of the HEPA filter membrane 6. Under the action of the semi-cylindrical column with equal diameters up and down of the diversion column, the air is dehumidified and filtered through the diversion column. Under the action of the equal diameters up and down, the uniformity of the air flow velocity with the diversion column is ensured. At the same time, through the setting of the HEPA filter membrane 6, the filtering effect of the overall filtering device on the tiny filter substances in the air is ensured, the purification efficiency of the air is ensured, and at the same time, the burden on the subsequent air treatment components is reduced, which is beneficial to extending the service life of the air filtration device.

[0043] Above and below the cylinder rack 2, an upper blade ring 13 and a lower blade ring 16 are respectively located above and below the inner part of the cylinder rack 2, and the centers of the upper blade ring 13 and the lower blade ring 16 coincide. The top of the upper blade ring 13 is fixedly connected with a slider 14, and the top of the slider 14 is slidably connected with a housing 1. Through the setting of the slider 14, when the upper blade ring 13 is driven to rotate, it rotates stably inside the housing 1, ensuring the working effect of the upper blade ring 13. At the same time, the upper blade ring 13 and the lower blade ring 16 rotate in opposite directions. Through such a setting, air can enter through the middle section, and after being processed, it exits through the upper and lower parts, ensuring the air outlet efficiency of the filtering device. At the same time, it is convenient to stir the air inside the environment, facilitating large-area air filtration and purification. At the same time, in order to achieve the air filtration effect, acid mist adsorption layers 21 are provided above the upper blade ring 13 and below the lower blade ring 16. The acid mist adsorption layers 21 are fixedly installed inside the housing 1, and a salt mist neutralization component is fixedly connected to the outside of the acid mist adsorption layers 21.

[0044] Furthermore, end filters 26 are fixedly connected to the outside of the salt mist neutralization components, and an air outlet 27 is fixedly connected to the outer wall of the end filters 26. Air outlets 27 are provided in the upper and lower sections of the housing 1. Specifically, the salt mist neutralization component includes a stainless steel skeleton 22, the stainless steel skeleton 22 is fixedly installed on the outside of the acid mist adsorption layer 21, and quaternary ammonium group strongly basic resin 23 and sulfonic acid group strongly acidic resin 24 are alternately filled in the left and right of the inside of the stainless steel skeleton 22, and multiple layers of quaternary ammonium group strongly basic resin 23 and sulfonic acid group strongly acidic resin 24 are alternately filled up and down. Through such a setting, the stainless steel skeleton 22 is made of 316 stainless steel material, which has good corrosion resistance, can intercept particulate matter, and has a certain air purification effect. Moreover, under the action of the quaternary ammonium group strongly basic resin 23 and the sulfonic acid group strongly acidic resin 24, through quaternary ammonium group anion resin and sulfonic acid group strongly acidic cation resin, under the action of the exchange resin, sodium ions, metal cations, chloride ions, and acidic anions in the salt mist are effectively captured and adsorbed, efficiently and stably reducing the salt content in the air. And through the up-and-down and left-and-right alternating setting of the quaternary ammonium group strongly basic resin 23 and the sulfonic acid group strongly acidic resin 24, the contact area between the exchange resin and the air is increased. At the same time, through mixed filtration, ion leakage is avoided, ensuring the filtration efficiency. And a polyvinylidene fluoride membrane 25 is fixedly connected to the outer wall of the stainless steel skeleton 22. Through the setting of the polyvinylidene fluoride membrane 25, a hydrophobic layer is coated on the surface of the stainless steel skeleton 22, ensuring the filtration and purification effect of the exchange resin.

[0045] The air purification method of the present invention includes the following steps: S1. Dehumidification filtration: Dehumidify and filter the air, and preliminarily process the humidity in the air through a prepared dehumidification component.

[0046] Preparation of dehumidification component: Process polytetrafluoroethylene into two concentric cylindrical shapes, set the two polytetrafluoroethylene cylinders concentrically, and set the inner diameter of the inner polytetrafluoroethylene to 5 μm. At the same time, fixedly connect multiple semicircular flow guiding columns that are continuously arranged at equal distances up and down on the inner wall of the inner polytetrafluoroethylene, and set a dehumidification filter layer between the two polytetrafluoroethylene cylinders.

[0047] Further, the dehumidification filter layer includes a HEPA filter layer, a first activated carbon filter layer, a graphene electrothermal layer, and a second activated carbon filter layer. Among them, the pore diameter of the HEPA filter layer is 0.2, the pore diameter of the graphene electrothermal layer is 3 nm, the pore diameter of the second activated carbon filter layer is 55 μm, and the pore diameter of the first activated carbon filter layer is 5 μm.

[0048] S2. Acid mist adsorption: Pass the dehumidified air through the acid mist adsorption layer 21 to remove acid mist and reduce the gaseous acid mist in the air.

[0049] Preparation of acid mist adsorption layer 21: Mix alumina with a purity of 99% and d50 = 2.5 μm, fused magnesia with a purity of 98% and 89 μm, and silicon carbide powder with 98% and d50 = 3 μm. And the ratio of alumina, fused magnesia, and silicon carbide powder is 2.5:1.5:6. After mixing, heat at a heating rate of 5 °C / min to 1280 °C, and then hold for 2.5 h for sintering to form a porous ceramic filter layer.

[0050] Stir polyethylenimine with a methanol solution, extract the solution by evaporation at 71 °C, then immerse the sintered porous ceramic filter layer in the solution to make the solid phase of the solution stably adhere to the surface of the porous ceramic filter layer, and control the coating thickness of polyethylenimine to 40 μm.

[0051] S3. Salt mist neutralization: Pass the air after acid mist adsorption through an exchange resin filled in a corrosion-resistant material to neutralize and exchange chloride ions in the air, achieving the capture of salt mist and avoiding the corrosion of steel structures by chloride ions in the air.

[0052] Preparation of corrosion-resistant material: Sinter and process a stainless steel filter mesh with a pore diameter of 10 μm, and set a nickel-based alloy coating on the surface of the stainless steel filter mesh.

[0053] Make the stainless steel filter mesh into a filter mesh frame, wrap a polyvinylidene fluoride membrane 25 with a pore diameter of 0.1 μm on the outer wall, and fill quaternary ammonium-based strongly basic resin 23 and sulfonic acid-based strongly acidic resin 24 inside.

[0054] S4. Outlet purification: Perform terminal filtration on the air after triple treatment to reduce the moisture content in the air and avoid the corrosion of steel structures caused by contact with moisture.

[0055] Terminal filter layer: It is woven with aminated polyacrylonitrile fibers to obtain a purification filter net with a pore size of 2 μm, and polytetrafluoroethylene is vapor-deposited on the surface of the purification filter net, and the polytetrafluoroethylene is in a convex structure. Example 2

[0056] The air purification method of the present invention includes the following steps: S1. Dehumidification filtration: The air is dehumidified and filtered, and the humidity in the air is initially processed by preparing a dehumidification component.

[0057] Prepare the dehumidification component: Process polytetrafluoroethylene into two concentric cylindrical shapes, and set the two polytetrafluoroethylene cylinders concentrically. The inner polytetrafluoroethylene has a pore size of 5 μm. At the same time, a plurality of semicircular flow guiding columns that are continuously arranged and equidistant up and down are fixedly connected to the inner wall of the inner polytetrafluoroethylene, and a dehumidification filter layer is arranged between the two polytetrafluoroethylene cylinders.

[0058] Further, the dehumidification filter layer includes a HEPA filter layer, a first activated carbon filter layer, a graphene electrothermal layer, and a second activated carbon filter layer. Among them, the HEPA filter layer has a pore size of 0.2, the graphene electrothermal layer has a pore size of 3 nm, the second activated carbon filter layer has a pore size of 55 μm, and the first activated carbon filter layer has a pore size of 5 μm.

[0059] S2. Acid mist adsorption: The dehumidified air is passed through the acid mist adsorption layer 21 to remove acid mist and reduce the gaseous acid mist in the air.

[0060] Prepare the acid mist adsorption layer 21: Mix alumina with a purity of 99% and d50 = 2.5 μm, fused magnesia with a purity of 98% and 89 μm, and silicon carbide powder with 98% and d50 = 3 μm. The ratio of alumina, fused magnesia, and silicon carbide powder is 2.5:1.5:6. After mixing, heat at a heating rate of 5 °C / min to 1280 °C and keep it warm for 2.5 h for sintering to form a porous ceramic filter layer.

[0061] Stir polyethylenimine with a methanol solution, extract the solution by evaporation at 71 °C, and then immerse the sintered porous ceramic filter layer in the solution so that the stable solid phase of the solution remains on the surface of the porous ceramic filter layer, and control the thickness of the polyethylenimine coating to 40 μm.

[0062] S3. Salt mist neutralization: The air after acid mist adsorption is passed through an exchange resin filled in a corrosion-resistant material to neutralize and exchange chloride ions in the air, so as to capture salt mist and prevent chloride ions in the air from corroding the steel structure.

[0063] Prepare the corrosion-resistant material: Sinter and process a stainless steel filter net with a pore size of 10 μm, and set a nickel-based alloy coating on the surface of the stainless steel filter net.

[0064] The stainless-steel filter mesh is made into a filter mesh frame, a polyvinylidene fluoride membrane 25 with a pore size of 0.1 μm is coated on the outer wall, and a quaternary ammonium group strongly basic resin 23 and a sulfonic acid group strongly acidic resin 24 are filled inside.

[0065] S4, Outlet air purification: The triple-treated air is subjected to terminal filtration treatment to reduce the moisture content in the air and prevent the steel structure from corroding due to contact with moisture.

[0066] Terminal filter layer: The aminated polyacrylonitrile fiber is woven to obtain a purification filter mesh with a pore size of 2 μm, and polytetrafluoroethylene is vapor-deposited on the surface of the purification filter mesh, and the polytetrafluoroethylene is in a convex structure.

[0067] An air filtration device for slowing down the corrosion of steel structures in industrial steel buildings, comprising a housing 1, a cylinder frame 2, a coarse activated carbon layer 3, a graphene electrothermal film 4, a fine activated carbon layer 5, a HEPA filter membrane 6, a conical column 7, an upper tooth groove 8, a gear column 9, a rotating rod 10, a driving motor 11, an outer tooth ring 12, an upper blade ring 13, a slider 14, a lower tooth groove 15, a lower blade ring 16, a dehumidification groove 17, a drain pipe 18, an air inlet 19, a slip ring 20, an acid mist adsorption layer 21, a stainless steel skeleton 22, a quaternary ammonium strong base resin 23, a sulfonic acid group strong acid resin 24, a polyvinylidene fluoride membrane 25, a terminal filter screen 26, an air outlet 27, a liquid receiving groove 28 and a drain pipe 29. The inner wall of the middle section of the housing 1 is rotatably connected to a cylinder frame 2. Among them, slip rings 20 are fixedly connected to both the upper and lower ends of the cylinder frame 2, and the outer walls of the slip rings 20 are slidably connected to the housing 1. The setting of slip rings at the upper and lower ends of the cylinder frame 2 ensures the transmission effect of the cylinder frame 2 inside the housing 1, facilitating the cylinder frame 2 to synchronously drive the upper blade ring 13 and the lower blade ring 16 to rotate in opposite directions when rotating. Moreover, an air inlet 19 is provided on the outside of the cylinder frame 2, and the air inlet 19 is opened in the middle section of the housing 1. Through such a setting, air can enter through the middle section, and after being processed, it exits through the upper and lower parts, ensuring the air outlet efficiency of the filtration device, while facilitating the agitation of the air inside the environment and facilitating the filtration and purification of the air over a large area. Moreover, in order to achieve the air filtration effect, the centers of the cylinder frame 2 and the housing 1 coincide. The inner wall of the cylinder frame 2 is fixedly connected to a coarse activated carbon layer 3, and a graphene electrothermal film 4 is fixedly installed on the other side of the coarse activated carbon layer 3. A fine activated carbon layer 5 is fixedly installed on the side of the graphene electrothermal film 4 away from the coarse activated carbon layer 3, and a HEPA filter membrane 6 is fixedly installed on the inner wall of the fine activated carbon layer 5. A plurality of continuously arranged conical columns 7 are fixedly connected to the inner wall of the HEPA filter membrane 6. The cylinder frame 2 and the conical columns 7 are both made of polytetrafluoroethylene, and the conical columns 7 are unequal-diameter oblique cones with a large upper part and a small lower part. And a plurality of conical columns 7 are continuously arranged in a ring on the inner wall of the HEPA filter membrane 6. Under the action of the unequal diameter of the conical columns 7 with a large upper part and a small lower part, air is dehumidified and filtered through the conical columns 7. Under the action of the oblique cone, the contact efficiency between the air and the conical columns 7 is improved, and it is convenient for water to flow down on the surface of the conical columns 7. At the same time, through the setting of the HEPA filter membrane 6, the filtration effect of the overall filtration device on tiny filter substances in the air is ensured, the purification efficiency of the air is ensured, and at the same time, the burden on subsequent air treatment components is reduced, which is beneficial to extending the service life of the air filtration device.

[0068] The inner upper wall of the cylinder rack 2 is fixedly connected with an upper tooth groove 8. The inner wall of the upper tooth groove 8 is meshed and connected with a gear column 9. The inside of the gear column 9 is fixedly connected with a rotating rod 10. The rotating rod 10 is rotatably connected inside the housing 1 and is driven by a driving motor 11. Specifically, the output end of the driving motor 11 is fixedly connected to the top of the rotating rod 10, and the driving motor 11 is fixedly installed inside the housing 1. The outer wall of the gear column 9 is meshed and connected with an outer tooth ring 12, and the inner wall of the outer tooth ring 12 is fixedly connected with an upper blade ring 13. The upper blade ring 13 is an annular structure with blades on the inner wall, and the upper blade ring 13 is rotatably connected inside the housing 1, and the center of the upper blade ring 13 coincides with the center of the cylinder rack 2.

[0069] The inner lower wall of the cylinder rack 2 is fixedly connected with a lower tooth groove 15, and the inner wall of the lower tooth groove 15 is meshed and connected with a lower blade ring 16. The outer wall of the lower blade ring 16 is rotatably connected with a dehumidification groove 17. The dehumidification groove 17 is located below the conical column 7. The dehumidification groove 17 is in an annular structure, and an opening is provided at the top of the dehumidification groove 17. The outer walls on both sides of the dehumidification groove 17 are fixedly connected with drain pipes 18. The outlet ends of the drain pipes 18 are located outside the housing 1. Through the setting of the dehumidification groove 17, the dehumidification groove 17 collects the dehumidified moisture at the bottom of the conical column 7. Moreover, under the action of the drain pipes 18, it is convenient for users to maintain and service the equipment. The inner bottom wall of the housing 1 is fixedly connected with a liquid receiving groove 28. The liquid receiving groove 28 is located at the lower end of the lower-stage salt mist neutralization assembly, and the outer wall of the liquid receiving groove 28 is fixedly connected with a drain pipe 29. The water outlet end of the drain pipe 29 is located outside the housing 1. Through such a setting, by arranging the liquid receiving groove 28 at the bottom of the filtering equipment, the liquid receiving groove 28 can collect the pure water generated by the salt mist neutralization assembly below, avoiding the excessive moisture content inside the housing from affecting the filtering performance of the components.

[0070] The upper blade ring 13 and the lower blade ring 16 are respectively located above and below the inside of the cylinder rack 2, and the centers of the upper blade ring 13 and the lower blade ring 16 coincide. The top of the upper blade ring 13 is fixedly connected with a slider 14. The top of the slider 14 is slidably connected with the housing 1. Through the setting of the slider 14, when the upper blade ring 13 is driven to rotate, it rotates stably inside the housing 1, ensuring the working effect of the upper blade ring 13. At the same time, acid mist adsorption layers 21 are provided above the upper blade ring 13 and below the lower blade ring 16. Among them, the lower acid mist adsorption layer 21 is fixedly installed at the bottom end of the lower blade ring 16, and the upper acid mist adsorption layer 21 is fixedly connected to the middle of the top of the upper blade ring 13. And the upper and lower acid mist adsorption layers 21 are vertically distributed. Salt mist neutralization assemblies are connected to both sides of the upper acid mist adsorption layer 21, and a salt mist neutralization assembly is connected to the bottom end of the lower acid mist adsorption layer 21.

[0071] Furthermore, end filters 26 are fixedly connected to both the outside of the salt spray neutralization component and the component, and the outer wall of the end filter 26 is fixedly connected to the air outlet 27. Air outlets 27 are provided in both the upper and lower sections of the housing 1. Specifically, the salt spray neutralization component includes a stainless steel skeleton 22 made of 316 stainless steel, which has good corrosion resistance, can intercept particulate matter, and has a certain air purification effect. Moreover, the stainless steel skeleton 22 is fixedly installed on the outside of the acid mist adsorption layer 21 to ensure the firm installation of the stainless steel skeleton 22. At the same time, quaternary ammonium group strongly basic resin 23 and sulfonic acid group strongly acidic resin 24 are alternately filled in the left and right of the stainless steel skeleton 22, and multiple layers of quaternary ammonium group strongly basic resin 23 and sulfonic acid group strongly acidic resin 24 are alternately filled up and down. And a polyvinylidene fluoride membrane 25 is fixedly connected to the outer wall of the stainless steel skeleton 22. Under the action of the quaternary ammonium group strongly basic resin 23 and the sulfonic acid group strongly acidic resin 24, through the quaternary ammonium group anion resin and the sulfonic acid group strongly acidic cation resin, under the action of the ion exchange resin, the sodium ions, metal cations, chloride ions and acidic anions in the salt spray are effectively captured and adsorbed, efficiently and stably reducing the salt content in the air. And through the up-and-down and left-and-right staggered arrangement of the quaternary ammonium group strongly basic resin 23 and the sulfonic acid group strongly acidic resin 24, the contact area between the ion exchange resin and the air is increased. At the same time, ion leakage is avoided through mixed filtration, ensuring the filtration efficiency. And in order to collect the pure water neutralized by the upper salt spray neutralization component, a water receiving tank 30 is fixedly connected to the bottom of the upper salt spray neutralization component. The water receiving tank 30 is sleeved around the outer wall of the acid mist adsorption layer 21 in a ring shape. Water outlet pipes are fixedly connected to both sides of the water receiving tank 30. Under the action of the water receiving tank 30 outside the acid mist adsorption layer 21, the water receiving tank 30 can collect the pure water below the quaternary ammonium group strongly basic resin 23 and the sulfonic acid group strongly acidic resin 24 and discharge it through the water outlet pipe.

[0072] Working principle: When handling air, external air enters from the middle section of the housing 1 through the air inlet 19. Under the action of the rotating cylinder frame 2 arranged to rotate in the middle section of the housing 1, when the driving motor 11 is powered on, the rotating rod 10 drives the gear column 9 to rotate. Under the action of the upper tooth groove 8 meshing and rotating on the outer wall of the gear column 9, the cylinder frame 2 rotates stably inside the housing 1. At the same time, by meshing and rotating the upper blade ring 13 on the outer wall of the gear column 9, the upper blade ring 13 rotates synchronously under the action of the gear column 9, facilitating the air guiding treatment of the upper blade ring 13 above the housing 1. At the same time, under the action of the lower blade ring 16 meshing and connecting below the cylinder frame 2, the cylinder frame 2 drives the lower blade ring 16 to rotate through meshing synchronization. Under the action of the same-direction rotation of the cylinder frame 2, due to the setting of the upper gear column 9 above, the upper blade ring 13 and the lower blade ring 16 rotate in opposite directions, guiding the air in the middle section of the housing 1 upward and downward respectively. Moreover, by fixedly connecting the coarse activated carbon layer 3 and the fine activated carbon layer 5 to the inner wall of the cylinder frame 2, the particulate matter in the air is efficiently filtered. And by setting the graphene electric heating film 4 between the two activated carbon layers, the dehumidification effect inside the cylinder frame is improved, which is beneficial to reducing the moisture in the air. And by setting the graphene electric heating film 4 between the two activated carbon layers, the graphene electric heating film 4 can rehabilitate the activated carbon on both sides by heating, improving the service life and purification efficiency of the activated carbon layer. And under the action of the HEPA filter membrane 6, it is convenient to filter tiny particulate matter. After the air is processed in the middle section of the housing 1, through the upward or downward movement of the upper blade ring 13 and the lower blade ring 16, under the action of the acid mist adsorption layer 21, the porous ceramic filter layer can well adsorb the acid mist through the mesoporous structure. And under the action of setting the polyethyleneimine coating on the surface of the porous ceramic filter layer, the chemical adsorption effect on the acid mist is improved, ensuring the filtering effect of the acid mist. At the same time, under the action of the salt mist neutralization component, through the setting of two kinds of exchange resins, the sodium ions, metal cations, chloride ions, and acidic anions in the salt mist are effectively captured and adsorbed, efficiently and stably reducing the salt content in the air, avoiding the corrosion of the steel structure caused by the salt content in the air. And by setting the end filter net 26 inside the air outlet 27, under the action of the end filter net 26 using amino-modified polyacrylonitrile fibers, the air is dehumidified for the second time before being discharged, ensuring the filtering effect of the air. Example 3

[0073] The air purification method of the present invention includes the following steps: S1. Dehumidification and filtration: Dehumidify and filter the air, and conduct primary treatment on the humidity in the air through the prepared dehumidification component.

[0074] Preparation of dehumidification component: Process polytetrafluoroethylene into two concentric cylindrical shapes, arrange the two polytetrafluoroethylene cylinders concentrically, and the inner diameter of the inner polytetrafluoroethylene is 8 μm. At the same time, a plurality of continuously arranged unequal-diameter inclined cones with a larger upper part and a smaller lower part are fixedly connected to the inner wall of the inner polytetrafluoroethylene, and a dehumidification filter layer is arranged between the two polytetrafluoroethylene cylinders.

[0075] Further, the dehumidification filter layer includes a HEPA filter layer, a first activated carbon filter layer, a graphene electrothermal layer, and a second activated carbon filter layer. Among them, the pore diameter of the HEPA filter layer is 0.4, the pore diameter of the graphene electrothermal layer is 2 nm, the pore diameter of the second activated carbon filter layer is 70 μm, and the pore diameter of the first activated carbon filter layer is 6 μm.

[0076] S2. Acid mist adsorption: Pass the dehumidified air through the acid mist adsorption layer 21 to remove acid mist and reduce the gaseous acid mist in the air.

[0077] Preparation of acid mist adsorption layer 21: Mix alumina with a purity of 99% and d50 = 2.5 μm, fused magnesia with a purity of 98% and 89 μm, and silicon carbide powder with a purity of 98% and d50 = 3 μm. The ratio of alumina, fused magnesia, and silicon carbide powder is 2.68:1.32:6. After mixing, heat at a heating rate of 10 °C / min to 1300 °C and keep it at this temperature for 3 h for sintering to form a porous ceramic filter layer.

[0078] Stir polyethylenimine with a methanol solution, extract the solution by evaporation at 72 °C, then immerse the sintered porous ceramic filter layer in the solution so that the stable solid phase of the solution remains on the surface of the porous ceramic filter layer, and control the thickness of the polyethylenimine coating to 60 μm.

[0079] S3. Salt mist neutralization: Pass the air after acid mist adsorption through an exchange resin filled in a corrosion-resistant material to neutralize and exchange chloride ions in the air, realizing the capture of salt mist and avoiding the corrosion of steel structures by chloride ions in the air.

[0080] Preparation of corrosion-resistant material: Sinter and process a stainless steel filter mesh with a pore diameter of 18 μm, and set a nickel-based alloy coating on the surface of the stainless steel filter mesh.

[0081] Make the stainless steel filter mesh into a filter mesh frame, cover a polyvinylidene fluoride membrane 25 with a pore diameter of 0.3 μm on the outer wall, and fill quaternary ammonium-based strongly basic resin 23 and sulfonic acid-based strongly acidic resin 24 inside.

[0082] S4. Outlet gas purification: Perform terminal filtration on the air after triple treatment to reduce the moisture content in the air and avoid the corrosion of steel structures caused by contact with moisture.

[0083] Terminal filter layer: It is woven with aminated polyacrylonitrile fibers to obtain a purification filter screen with a pore size of 3 μm, and polytetrafluoroethylene is vapor-deposited on the surface of the purification filter screen, and the polytetrafluoroethylene is in a convex structure.

[0084] The filtering device in this embodiment is the same as that in Embodiment 2, only the filtering method is different. Embodiment 4

[0085] The air purification method of the present invention includes the following steps: S1. Dehumidifying filtration: The air is dehumidified and filtered, and the humidity in the air is initially treated by preparing a dehumidifying component.

[0086] Preparing the dehumidifying component: Process polytetrafluoroethylene into two concentric cylindrical shapes, and set the two polytetrafluoroethylene cylinders concentrically. The inner polytetrafluoroethylene has a pore size of 8 μm. At the same time, a plurality of continuously arranged trapezoids with a larger upper part and a smaller lower part are fixedly connected to the inner wall of the inner polytetrafluoroethylene, and a dehumidifying filter layer is arranged between the two polytetrafluoroethylene cylinders.

[0087] Furthermore, the dehumidifying filter layer includes a HEPA filter layer, a first activated carbon filter layer, a graphene electrothermal layer, and a second activated carbon filter layer. Among them, the HEPA filter layer has a pore size of 0.5, the graphene electrothermal layer has a pore size of 5 nm, the second activated carbon filter layer has a pore size of 80 μm, and the first activated carbon filter layer has a pore size of 8 μm.

[0088] S2. Acid mist adsorption: The dehumidified air is passed through the acid mist adsorption layer 21 to remove acid mist and reduce the gaseous acid mist in the air.

[0089] Preparing the acid mist adsorption layer 21: Alumina with a purity of 99% and d50 = 2.5 μm, fused magnesia with a purity of 98% and 89 μm, and silicon carbide powder with 98% and d50 = 3 μm are used. The ratio of alumina, fused magnesia, and silicon carbide powder is 2.53:1.67:5.8. After mixing, the temperature is raised to 1380 °C at a heating rate of 15 °C / min and kept warm for 3.5 h for sintering to form a porous ceramic filter layer.

[0090] Stir polyethyleneimine with a methanol solution, extract the solution by evaporation at 73 °C, and then immerse the sintered porous ceramic filter layer in the solution so that the stable solid phase of the solution remains on the surface of the porous ceramic filter layer, and control the thickness of the polyethyleneimine coating to 80 μm.

[0091] S3. Salt mist neutralization: The air after acid mist adsorption is passed through an exchange resin filled in a corrosion-resistant material to neutralize and exchange chloride ions in the air, realizing the capture of salt mist and avoiding the corrosion of steel structures by chloride ions in the air.

[0092] Preparation of corrosion-resistant material: sinter and process a stainless steel filter mesh with a pore size of 20 μm, and set a nickel-based alloy coating on the surface of the stainless steel filter mesh.

[0093] Make the stainless steel filter mesh into a filter mesh frame, wrap a polyvinylidene fluoride membrane 25 with a pore size of 0.5 μm on the outer wall, and fill quaternary ammonium-based strongly basic resin 23 and sulfonic acid-based strongly acidic resin 24 inside.

[0094] S4. Exhaust gas purification: perform terminal filtration on the triple-treated air to reduce the moisture content in the air and avoid corrosion of the steel structure caused by contact with moisture.

[0095] Terminal filter layer: weave with amino-functionalized polyacrylonitrile fibers to obtain a purification filter mesh with a pore size of 5 μm, and vapor-deposit polytetrafluoroethylene on the surface of the purification filter mesh, and the polytetrafluoroethylene is in a convex structure.

[0096] This embodiment has the same filtration equipment as Embodiment 2, only the filtration method is different.

[0097] Fix the air filtration equipment of the above-mentioned Embodiments 1-4 at a fixed position in the steel structure workshop for air filtration. At the same time, filter the air at the same position in the same steel structure workshop with the existing air filtration equipment, and test the filtration performance of the air filtration equipment according to GB / T18801-2015, EN779, ISO16890 and HJ549-2016. The measured results are shown in the table:

[0098] According to the data in the table, it can be seen that only the filtration equipment is different between Embodiment 1 and Embodiment 2. The removal rates of chloride ions, sulfur dioxide, and salt mist in Embodiment 2 are all better than those in Embodiment 1. Therefore, by using the air filtration equipment of the present invention, the moisture, salt, and chloride ions in the air can be reduced, thereby effectively slowing down the corrosion of chloride ions and salt mist in the air on the steel structure material.

[0099] Compared with Embodiment 2, Embodiments 3 and 4 only have different filtration methods, and the air filtration equipment is the same. The removal rates of chloride ions, sulfur dioxide, and salt mist in Embodiments 3 and 4 are all lower than those in Embodiment 2. It can be seen from this that different filtration methods will also affect the removal rates of moisture, salt, and chloride ions in the air.

[0100] In summary, through the different structural settings of multiple filtering units, the synchronous and efficient dehumidification, acid mist removal, and salt mist removal of air are realized, enabling the efficient removal of chloride ions and sodium ions in the air, greatly reducing the salt and moisture in the air, avoiding the corrosion caused by the contact of acid mist, salt mist, and moisture with the steel structure, facilitating the reduction of the corrosion rate of the steel structure material, improving the overall stability of the steel structure, and solving the technical problem that the existing air filtration cannot simultaneously achieve the effects of dehumidification, acid mist removal, and salt mist removal in the air and cannot effectively slow down the corrosion of the steel structure material by the air. The specific embodiments described herein are merely illustrative of the spirit of the present invention. Those skilled in the art to which the present invention pertains can make various modifications or supplements to the described specific embodiments or use similar methods for substitution, but will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. An air filtration device for slowing down the corrosion of steel structures in a steel structure industrial workshop, characterized in that, The inner wall of the middle section of the housing (1) is rotatably connected to a cylinder frame (2). The cylinder frame (2) coincides with the center of the housing (1). The inner wall of the cylinder frame (2) is fixedly connected to a layer of coarse activated carbon (3). On the other side of the coarse activated carbon layer (3), a graphene electrothermal film (4) is fixedly installed. On the side of the graphene electrothermal film (4) away from the coarse activated carbon layer (3), a layer of fine activated carbon (5) is fixedly installed. And inside the fine activated carbon layer (5), a HEPA filter membrane (6) is fixedly installed. Inside the HEPA filter membrane (6), a plurality of continuously arranged conical columns (7) are fixedly connected. The inner upper wall of the cylinder frame (2) is fixedly connected to an upper tooth groove (8). Inside the inner wall of the upper tooth groove (8), a gear column (9) is meshed. Inside the gear column (9), a rotating rod (10) is fixedly connected. The rotating rod (10) is rotatably connected inside the housing (1). And the rotating rod (10) is driven by a driving motor (11). On the outer wall of the gear column (9), an outer tooth ring (12) is meshed. And inside the inner wall of the outer tooth ring (12), an upper blade ring (13) is fixedly connected. The upper blade ring (13) is rotatably connected inside the housing (1). And the center of the upper blade ring (13) coincides with the center of the cylinder frame (2). The inner lower wall of the cylinder frame (2) is fixedly connected to a lower tooth groove (15). And inside the inner wall of the lower tooth groove (15), a lower blade ring (16) is meshed. On the outer wall of the lower blade ring (16), a dehumidification groove (17) is rotatably connected. The dehumidification groove (17) is located below the conical columns (7). The upper blade ring (13) and the lower blade ring (16) are respectively located above and below the inside of the cylinder frame (2). And the centers of the upper blade ring (13) and the lower blade ring (16) coincide. Above the upper blade ring (13) and below the lower blade ring (16), there are acid mist adsorption layers (21). The lower acid mist adsorption layer (21) is fixedly installed at the bottom end of the lower blade ring (16). The upper acid mist adsorption layer (21) is fixedly connected to the middle part of the top end of the upper blade ring (13). And on both sides of the upper acid mist adsorption layer (21), salt mist neutralization components are connected. At the bottom end of the lower acid mist adsorption layer (21), salt mist neutralization components are connected. On the outer sides of the salt mist neutralization components, end filter meshes (26) are all connected. And on the outer wall of the end filter meshes (26), air outlets (27) are fixedly connected. Air outlets (27) are provided in both the upper section and the lower section of the housing (1).

2. The air filtration device for slowing down the corrosion of steel structures in steel structure industrial plants according to claim 1, characterized in that, The cylinder frame (2) and the conical columns (7) are both made of polytetrafluoroethylene. And the conical columns (7) are unequal-diameter oblique cones with a larger top and a smaller bottom. And a plurality of conical columns (7) are continuously arranged in a ring on the inner wall of the HEPA filter membrane (6).

3. The air filtration device for slowing down the corrosion of steel structures in steel structure industrial plants according to claim 1, characterized in that, At the top end of the upper blade ring (13), a slider (14) is fixedly connected. On the top end of the slider (14), the housing (1) is slidably connected. At both the upper and lower ends of the cylinder frame (2), sliding rings (20) are fixedly connected. And on the outer wall of the sliding rings (20), the housing (1) is slidably connected. The output end of the driving motor (11) is fixedly connected to the top end of the rotating rod (10). And the driving motor (11) is fixedly installed inside the housing (1).

4. The air filtration device for slowing down the corrosion of steel structures in steel structure industrial plants according to claim 1, characterized in that, An air inlet (19) is provided on the outside of the cylinder frame (2). The air inlet (19) is provided in the middle section of the housing (1). The dehumidification tank (17) has an annular structure, and an opening is provided at the top of the dehumidification tank (17). Drain pipes (18) are fixedly connected to the outer walls on both sides of the dehumidification tank (17), and the outlet ends of the drain pipes (18) are located outside the housing (1). A liquid receiving tank (28) is fixedly connected to the inner bottom wall of the housing (1). The liquid receiving tank (28) is located at the bottom end of the lower salt mist neutralization assembly, and a drain pipe (29) is fixedly connected to the outer wall of the liquid receiving tank (28). The water outlet end of the drain pipe (29) is located outside the housing (1).

5. The air filtration device for slowing down the corrosion of steel structures in steel structure industrial plants according to claim 1, characterized in that, The salt mist neutralization assembly includes a stainless steel skeleton (22). The stainless steel skeleton (22) is fixedly installed outside the acid mist adsorption layer (21). Quaternary ammonium group strongly basic resin (23) and sulfonic acid group strongly acidic resin (24) are alternately filled in the left and right of the interior of the stainless steel skeleton (22), and multiple layers of quaternary ammonium group strongly basic resin (23) and sulfonic acid group strongly acidic resin (24) are alternately filled up and down. A polyvinylidene fluoride membrane (25) is fixedly connected to the outer wall of the stainless steel skeleton (22). The bottom end of the upper salt mist neutralization assembly is fixedly connected with a water receiving tank (30). The water receiving tank (30) is sleeved in a ring shape on the outer wall of the acid mist adsorption layer (21). Water outlet pipes are fixedly connected to both sides of the water receiving tank (30).

6. An air purification method for the air filtration device according to claim 1, characterized in that, It includes the following steps: S1. Dehumidification and filtration: Dehumidify and filter the air, and perform preliminary treatment on the humidity in the air through the prepared dehumidification component. Prepare the dehumidification component: Process polytetrafluoroethylene into two cylindrical shapes, and set dehumidification and filtration layers on the two polytetrafluoroethylene cylinders. The dehumidification and filtration layer includes a HEPA filtration layer, a first activated carbon filtration layer, a graphene electric heating layer, and a second activated carbon filtration layer. S2. Acid mist adsorption: Pass the dehumidified air through the acid mist adsorption layer (21) to remove acid mist and reduce the gaseous acid mist in the air. Prepare the acid mist adsorption layer (21): Mix alumina, fused magnesia, and silicon carbide powder, and sinter to form a porous ceramic filtration layer. Stir polyethylenimine and methanol solution, extract the solution by evaporation at 71°C - 73°C, and then immerse the sintered porous ceramic filtration layer in the solution so that the solid phase of the solution is stably maintained on the surface of the porous ceramic filtration layer. S3. Salt mist neutralization: Pass the air after acid mist adsorption through the exchange resin filled in the corrosion-resistant material to perform neutralization exchange on the chloride ions in the air, achieve the capture of salt mist, and avoid the corrosion of steel structures by chloride ions in the air. Prepare the corrosion-resistant material: Sinter a stainless steel filter mesh, and set a nickel-based alloy coating on the surface of the stainless steel filter mesh. Make the stainless steel filter mesh into a filter mesh frame, cover a polyvinylidene fluoride membrane (25) on the outer wall, and fill quaternary ammonium group strongly basic resin (23) and sulfonic acid group strongly acidic resin (24) inside. S4. Outlet gas purification: Perform terminal filtration treatment on the air after triple treatment to reduce the moisture content in the air and avoid the corrosion of steel structures caused by contact with moisture. Terminal filtration layer: Weave with amino-functionalized polyacrylonitrile fibers to obtain a purification filter mesh, and vapor deposit polytetrafluoroethylene on the surface of the purification filter mesh, and the polytetrafluoroethylene is in a convex structure.

7. The air purification method of the air filtration device according to claim 6, characterized in that, In step S1, the two polytetrafluoroethylene cylinders are arranged in a concentric structure, the inner diameter of the inner polytetrafluoroethylene is 5-8 μm, and a plurality of continuously arranged flow guiding columns are fixedly connected to the inner wall of the inner polytetrafluoroethylene; The pore size of the HEPA filter layer is 0.2 μm - 0.5 μm; The pore size of the graphene electric heating layer is 2 nm - 5 nm; The pore size of the second activated carbon filter layer is 50 μm - 80 μm; The pore size of the first activated carbon filter layer is 5 μm - 8 μm.

8. The air purification method of the air filtration device according to claim 6, characterized in that, In step S2, the ratio of alumina, fused magnesia and silicon carbide powder is 2.68:1.32:6, and the sintering method is to raise the temperature to 1280 °C - 1380 °C at a heating rate of 10 °C / min for the sintering time and then keep it warm for 2.5 h - 3.5 h; The purity of alumina is 99%, d50 = 2.5 μm; The purity of fused magnesia is 98%, 89 μm; The purity of silicon carbide powder is 98%, d50 = 3 μm; The thickness of the polyethyleneimine coating on the surface of the porous ceramic filter layer is 40 μm - 80 μm.

9. The air purification method of the air filtration device according to claim 6, characterized in that, In step S3, the pore size of the stainless steel filter mesh is 10 μm - 20 μm, and the pore size of the polyvinylidene fluoride membrane (25) is 0.1 μm - 0.5 μm.

10. The air purification method of the air filtration device according to claim 6, characterized in that, In step S4, the pore size of the purification filter mesh is 2 μm - 5 μm.

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