Air filtering equipment for painting workshop

Abstract

The invention relates to the technical field of air filtration, and provides air filtration equipment for a painting workshop, the air filtration equipment comprises an air purification tower, a waste gas inlet pipe, a front spraying pre-washing module, a core biological purifier and a rear deep purifier, the core biological purifier comprises a biological reaction module and a middle filtration module, a nutrient solution circulating pipe in the biological reaction module is connected among a plurality of rotary drum type bioreactors, the rotary drum type bioreactors are arranged in a flow guide grid, the middle filtering module comprises a rigid frame body and a dynamic anti-blocking unit, and the dynamic anti-blocking unit comprises a mesh belt which is rotationally connected between two groups of roller pipes; the driving part is used for controlling the roller pipe to rotate, the core biological purifier is arranged on the inner side of the mesh belt, the second transmission gear is fixedly arranged on the surface of the roller pipe, the first transmission gear and the second transmission gear are both in transmission connection with the mesh belt, and the mesh belt is meshed with teeth of the rotary drum type bioreactor, so that the device has the characteristics of high purification efficiency and difficulty in blockage.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of air filtration, in particular to an air filtration equipment for a spraying workshop. BACKGROUND

[0002] Typical pollutants in the waste gas of the spraying workshop include benzene series, ketones, esters and a small amount of hydrogen sulfide. During purification treatment, the waste gas is first pre-wetted by spraying water, and then the toluene, xylene, ketones, esters and hydrogen sulfide in the waste gas are removed by using the hydrophobic VOCs specific bacteria, oxygen-containing VOCs degradation bacteria and hydrogen sulfide oxidizing bacteria in different biological filter towers in turn. Each biological filter tower is connected by a pipeline.

[0003] After searching, the existing publication number CN103801191B discloses a device for treating odor and organic pollutants by biological filtration, which is mainly used in the fields of chemical environmental protection treatment, environmental pollution and purification treatment, etc. The device comprises a spraying tower and a biological filter. The biological filter comprises a buffer layer, a biological bacteria filter layer and an exhaust layer. The biological bacteria filter layer is filled with biological filter material. The waste gas is sprayed through the spraying tower and then sent to the buffer layer of the biological filter. The buffer layer buffers the waste gas and then sends it to the biological bacteria filter layer at a uniform pressure. After the waste gas fully reacts with the biological filter material, it enters the exhaust layer and is discharged. The device combines the spraying tower and the biological filter, so that the cleaning and filtration effect of the device on the waste gas is more obvious. The biological bacteria decomposition technology can completely decompose the pollution factors in the waste gas, reduces the pollution degree of the foul gas to the atmosphere, and the overall structure of the device is simple, easy to operate and has good market prospects.

[0004] The air filtration equipment for the spraying workshop still has the following defects: (1) The carriers of the hydrophobic VOCs specific bacteria and the oxygen-containing VOCs degradation bacteria in the biological filter tower are fixed, the waste gas flows through the surface in one direction, the bacteria on the windward surface are exposed to high-concentration pollutants and air flow shear force for a long time, and are easy to fall off, inactivate or block. The contact efficiency on the leeward surface is low, and the overall degradation efficiency is uneven; The air flow path is single and short, and the effective contact time of the bacteria with the molecules of the refractory VOCs is limited; The sticky paint mist particles that cannot be completely intercepted by the pre-filter (spraying water washing or plate filter) will gradually block the pores of the bacteria carrier, reducing the air permeability and the activity of the bacteria. SUMMARY

[0005] The present application aims to provide an air filtration equipment for a spraying workshop, which solves the problems of the existing air filtration equipment.

[0006] To achieve the above object, the present application provides the following technical scheme, a kind of air filtering equipment for spraying workshop, including air purification tower, waste gas inlet pipe, front spray prewash module and rear deep purifier, the front spray prewash module and rear deep purifier are fixedly arranged in air purification tower, still include: Core biological purifier is arranged between front spray prewash module and rear deep purifier, the core biological purifier includes biological reaction module and middle filter module, the biological reaction module includes flow guide grid, rotary drum bioreactor and nutrient solution circulation pipe, the nutrient solution circulation pipe is connected between a plurality of rotary drum bioreactors, the rotary drum bioreactor is arranged in flow guide grid, and the rotary drum bioreactor includes transmission gear one; Middle filter module includes rigid frame and dynamic anti-blocking unit, the flow guide grid and dynamic anti-blocking unit are arranged in rigid frame, the dynamic anti-blocking unit includes mesh belt, driving part, transmission gear two and roller tube, the mesh belt is rotatably connected between two groups of roller tubes, the driving part is used to control the rotation of roller tube, the core biological purifier is arranged in the inner side of mesh belt, the transmission gear two is fixedly arranged on the surface of roller tube, and the transmission gear one and transmission gear two are all drivingly connected with mesh belt.

[0007] The present application has the beneficial effects that: the mesh belt and the rotary drum bioreactor are engaged and linked through the teeth, which not only realizes the periodic conversion of the "windward position" and "leeward position" of the purification bacteria membrane in the double-layer mesh belt fine filtering environment, but also realizes the online deep cleaning of the mesh belt, increases the effective contact area of the pollutant molecules and the purification bacteria in the relatively mild environment, maintains the constant humidity required for the long-term high activity of the purification bacteria, solves the problems of low degradation efficiency of the purification bacteria and easy blocking of the biological carrier pores in the existing air filtering equipment, and has the characteristics of high purification efficiency and not easy to block. BRIEF DESCRIPTION OF DRAWINGS

[0008] Figure 1 It is the plane section view of the present application.

[0009] Figure 2 It is the disassembly and assembly schematic view of the core biological purifier of the present application.

[0010] Figure 3 It is the disassembly and assembly schematic view of the biological reaction module of the embodiment of the present application.

[0011] Figure 4 It is the disassembly and assembly schematic view of the rotary drum bioreactor of the embodiment of the present application.

[0012] Figure 5 It is the disassembly and assembly schematic view of the middle filter module of the embodiment of the present application.

[0013] Figure 6A sectional view of a core biological purifier according to an embodiment of the present application.

[0014] Figure 7 A planar sectional view of a core biological purifier according to an embodiment of the present application.

[0015] Figure 8 A perspective view of a core biological purifier according to an embodiment of the present application. Figure 7 A partial enlarged view of a portion a in the core biological purifier.

[0016] Figure 9 A perspective view of a core biological purifier according to an embodiment of the present application. Figure 7 A partial enlarged view of a portion b in the core biological purifier.

[0017] Figure 10 A perspective view of a core biological purifier according to an embodiment of the present application.

[0018] Figure 11 An installation schematic view of a core biological purifier according to an embodiment of the present application.

[0019] Reference signs: 1-air purification tower, 11-waste water collection pool, 12-drainage passage, 13-purified gas discharge pipe, 14-housing bin; 2-waste gas inlet pipe; 3-lead spray pre-washing module; 4-core biological purifier, 41-biological reaction module, 411-flow guide grid, 412-rotary drum biological reactor, 4121-outer mesh cover, 4122-biological reaction carrier, 41221-core tube, 41222-inner mesh core, 41223-transmission gear one, 41224-hydrating sponge body, 41225-drip irrigation hole, 41226-protruding structure, 413-nutrient solution circulation pipe, 42-intermediate filter module, 421-rigid frame body, 4211-cleaning piece, 422-dynamic anti-blocking unit, 4221-driving piece, 4222-roller tube, 4223-mesh belt, 4224-transmission gear two, 4225-water spraying hole, 423-cleaning solution circulation pipe; 5-post-deep purifier; 6-sealing cover. DETAILED DESCRIPTION

[0020] In order to make the objectives, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and should not be used to limit the present application.

[0021] The specific implementation of the present application will be described in detail below with reference to specific embodiments.

[0022] Please refer to Figures 1 to 10In one embodiment of the present application, an air filtering device for a spraying workshop comprises an air purification tower 1, a waste gas inlet pipe 2, a pre-spraying pre-washing module 3 and a post deep purifier 5, the pre-spraying pre-washing module 3 and the post deep purifier 5 are fixedly arranged in the air purification tower 1, a purified gas discharge pipe 13 is arranged above the air purification tower 1, the waste gas of the spraying workshop enters the air purification tower 1 through the waste gas inlet pipe 2, the pre-spraying pre-washing module 3 is used to remove solid pollutants such as large-particle paint mist, dust and fibers in the waste gas, to protect the subsequent precision filter layer and biological layer from being blocked and polluted, and is also used to pre-wet the gas, to facilitate the subsequent biological treatment and purification, and further comprises: A core biological purifier 4 is arranged between the pre-spraying pre-washing module 3 and the post deep purifier 5, the core biological purifier 4 comprises a biological reaction module 41 and a middle filter module 42, the biological reaction module 41 comprises a flow guide grid 411, a rotary drum biological reactor 412 and a nutrient solution circulation pipe 413, the nutrient solution circulation pipe 413 is connected between a plurality of rotary drum biological reactors 412, the rotary drum biological reactor 412 is arranged in the flow guide grid 411, and the rotary drum biological reactor 412 comprises a transmission gear one 41223; The middle filter module 42 comprises a rigid frame 421 and a dynamic anti-blocking unit 422, the flow guide grid 411 and the dynamic anti-blocking unit 422 are arranged in the rigid frame 421, the dynamic anti-blocking unit 422 comprises a mesh belt 4223, a driving member 4221, a transmission gear two 4224 and a roller pipe 4222, the mesh belt 4223 is rotationally connected between two groups of roller pipes 4222, the driving member 4221 is used to control the rotation of the roller pipe 4222, the core biological purifier 4 is arranged inside the mesh belt 4223, the transmission gear two 4224 is fixedly arranged on the surface of the roller pipe 4222, and the transmission gear one 41223 and the transmission gear two 4224 are in transmission connection with the mesh belt 4223.

[0023] Please refer to Figure 11 Further, a containing bin 14 is arranged on the side of the air purification tower 1, the core biological purifier 4 is filled in the containing bin 14, and a sealing cover 6 is arranged at the opening of the containing bin 14, so that the containing bin 14 has the characteristics of convenient maintenance.

[0024] In the embodiment of the present application, the waste gas of the spraying workshop enters the air purification tower 1 through the waste gas inlet pipe 2, and the pre-spraying pre-washing module 3 is used to remove solid pollutants such as large-particle paint mist, dust and fibers in the waste gas, to protect the subsequent precision filter layer and biological layer from being blocked and polluted.

[0025] In static mode, the middle filter module 42 in the core biological purifier 4 is arranged between the two groups of roller tubes 4222, and the mesh belt 4223 arranged between the two groups of roller tubes 4222 is divided into two layers by the roller tubes 4222, the mesh belt 4223 is wrapped in the middle of the biological reaction module 41, and a compact “sandwich” structure (mesh belt 4223, biological layer, mesh belt 4223) is formed, multiple functions are integrated in a limited tower space, and the mesh belt 4223 distributed below the biological reaction module 41 can further filter particulate matters contained in the rising waste gas.

[0026] Please refer to Figure 3 、 Figure 4 and Figure 8 In another embodiment of the present application, the rotary drum biological reactor 412 further comprises an outer mesh cover 4121 and a biological reaction carrier 4122, the outer mesh cover 4121 is sleeved outside the biological reaction carrier 4122, the biological reaction carrier 4122 comprises a core tube 41221, an inner mesh core 41222, drip irrigation holes 41225 and a protruding structure 41226, the inner mesh core 41222 is fixedly sleeved on the surface of the core tube 41221, the surface of the core tube 41221 is provided with the drip irrigation holes 41225, the core tube 41221 is connected with the nutrient solution circulating pipe 413 at both ends, the protruding structure 41226 is arranged inside the inner mesh core 41222, the protruding structure 41226 significantly increases the attachment area, and the transmission gear one 41223 is fixedly connected with the core tube 41221.

[0027] Please refer to Figure 3 、 Figure 4 and Figure 8 Further, the inner mesh core 41222 comprises an annular mesh core and a radial mesh plate, a plurality of radial mesh plates are arranged in an annular array on the circumferential side of the annular mesh core, the protruding structure 41226 is arranged on the surface of the radial mesh plate, the inner side of the outer mesh cover 4121 is provided with an axial groove, and the radial mesh plate is embedded in the axial groove. This matching structure not only guarantees the structural strength and supports rotation, but also can form a stable and uniform waste gas flow passage. The waste gas needs to flow around the rotating cylindrical carrier (the outer mesh cover 4121 and the inner mesh core 41222), which is different from the traditional non-linear penetration. The gas path is significantly increased, and at the same time, the rotating agitation of the gas flow increases the turbulent flow, strengthens the mass transfer and diffusion of pollutants into the biological membrane, greatly increases the effective contact area and time of pollutant molecules and purification bacteria.

[0028] Please refer to Figure 3 、 Figure 4 and Figure 8Further, the biological reaction carrier 4122 further comprises a moisturizing sponge body 41224 filled between the core pipe 41221 and the annular net core, which not only absorbs the nutrient solution from the drip irrigation hole 41225, reduces the flow rate, prevents the blockage of the inner net core 41222 pores by the instantaneous large flow, but also can utilize the capillary effect to slowly, continuously and uniformly transport the nutrient solution to the purification bacteria membrane on the surface of the convex structure 41226 through the radial net plate, and further has the functions of water retention and moisture locking, and maintains the constant humidity of the micro environment inside the carrier, which is the key guarantee for the long-term high activity of the purification bacteria.

[0029] In the embodiment of the present application, the outer net cover 4121 and the inner net core 41222 in the biological reaction module 41 are porous ceramics or modified polymer composites, which not only can play the roles of air permeability, filtration and flow rate reduction, so that the air flow uniformly and slowly passes through the convex structure 41226 attached with the purification bacteria, significantly increases the effective contact area and contact time of the pollutants and the purification bacteria, and the gaseous VOCs in the air are adsorbed, absorbed and finally biodegraded into CO2, H2O and the like by the active purification bacteria attached to the convex structure 41226 when flowing through the surface and inside of the outer net cover 4121 and the inner net core 41222. The contact time of the pollutants and the purification bacteria is long, the degradation efficiency is high, the nutrient solution circulation pipe 413 transports the nutrient solution to the moisturizing sponge body 41224 through the core pipe 41221 and the drip irrigation hole 41225, which not only reduces the flow rate of the nutrient solution, prevents the blockage of the inner net core 41222 by the nutrient solution, but also plays the role of water retention, and the wet sponge can continuously transport the nutrient solution to the purification bacteria, and the saturated moisturizing sponge body 41224 can utilize the capillary effect to transport the nutrient solution to the convex structure 41226 and the purification bacteria membrane through the inner net core 41222, and the Fe 3 ⁺, ketone dehydrogenase, esterase and the like in the nutrient solution are used to maintain the activity and metabolism of the purification bacteria, the mesh belt 4223 above the biological reaction module 41 is used to capture a small amount of bioaerosol that may fall off, the rear deep purification device 5 further captures the extremely small particulate matters and the purification bacteria spores that may be generated by biodegradation through the ultra-high efficiency particulate air filter, adsorbs the residual micro VOCs or odor molecules through the activated carbon and photocatalytic oxidation module, kills the purification bacteria that may escape, assists in decomposing the trace amount of refractory organic matter, and the rear deep purification device 5 further has a backwashing function, which can automatically clean the internal particulate air filter by utilizing the reverse airflow, so as to ensure that the cleanliness of the discharged air meets the standard, and the mesh belt 4223 is arranged to reduce the impact force of the reverse airflow, so as to prevent the inner purification bacteria layer from falling off or being damaged.

[0030] In the dynamic mode, the driving member 4221 is used to control the rotation of the roller tube 4222 at a set frequency. The rotating roller tube 4222 controls the movement of the mesh belt 4223 through the transmission gear two 4224 (the mesh belt 4223 is provided with a tooth groove at the edge). The moving mesh belt 4223 can also drive the core tube 41221, the inner mesh core 41222 and the outer mesh cover 4121 (axial slot and radial mesh plate) to rotate through the transmission gear one 41223. The purpose is to adjust the windward convex structure 41226 or biological membrane to leeward convex structure 41226 or biological membrane through rotation, which not only increases the contact area, so that the VOC molecules in the waste gas have a longer path and more opportunities to collide with, adsorb and degrade the biological membrane attached to the channel wall (i.e. the leeward surface / inside), which is more effective than simply sweeping the windward surface, but also reduces the biological membrane in the windward position for a long time due to direct airflow impact and coverage of viscous particles, causing the purification bacteria to fall off or die. The slight centrifugal force generated by rotation also helps to shake off part of the non-viscous attachments.

[0031] Please refer to Figure 5 and Figure 9 In another embodiment of the present application, the surface of the roller tube 4222 is provided with a water spray hole 4225, and the two ends of the roller tube 4222 are connected with a cleaning liquid circulation pipe 423.

[0032] Please refer to Figure 1 Further, the air purification tower 1 is provided below with a sewage collection tank 11, and the air purification tower 1 is provided with a drainage channel 12 and a containing bin 14 on the side, and the communication part of the drainage channel 12 and the sewage collection tank 11 is distributed below the pre-spraying pre-washing module 3.

[0033] Please refer to Figure 9 Further, the rigid frame 421 is fixedly provided with a cleaning member 4211 at the corresponding position of the drainage channel 12, and the lower surface of the mesh belt 4223 is in sliding contact with the cleaning member 4211.

[0034] In the embodiment of the present application, whether in static mode or dynamic mode, the cleaning liquid circulation pipe 423 sprays cleaning liquid to the surface of the mesh belt 4223 through the roller tube 4222 and the water spray hole 4225. In the static mode, the cleaning liquid is used to wet the mesh belt 4223, so as to ensure that the rising gas passing through the mesh belt 4223 remains wet, which helps the purification bacteria above to participate in the next purification. The strong water flow of the cleaning liquid combined with the mechanical scraping of the cleaning member 4211 can effectively clean the particle blockage on both sides of the mesh belt 4223 and inside the holes. The cleaned sewage can enter the sewage collection tank 11 along the drainage channel 12 on both sides, preventing the sewage from directly falling on the surface of the pre-spraying pre-washing module 3 to affect the filtering effect.

[0035] In summary, this application, through the meshing linkage between the perforated belt 4223 and the rotary bioreactor 412, not only achieves the periodic switching between the "windward" and "leeward" positions of the purifying bacterial membrane under the fine filtration environment of the double-layer perforated belt 4223, but also achieves online deep cleaning of the perforated belt 4223 without affecting operation. This increases the effective contact area between pollutant molecules and purifying bacteria in a relatively mild environment, and maintains the constant humidity required for the purifying bacteria to maintain high activity over a long period of time. It solves the problems of low degradation efficiency of purifying bacteria and easy clogging of biological carrier pores in existing air filtration equipment, and has the characteristics of high purification efficiency and non-clogging.

[0036] While several embodiments and examples of the present invention have been described for those skilled in the art, these embodiments and examples are provided as examples and are not intended to limit the scope of the invention. These new embodiments can be implemented in various other ways, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention.

[0037] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. An air filtering device for a spray booth, comprising an air purification tower (1), a waste gas inlet pipe (2), a front spray pre-washing module (3) and a rear deep purifier (5), the front spray pre-washing module (3) and the rear deep purifier (5) being fixedly arranged in the air purification tower (1), characterized in that, Also include: The core biological purifier (4) is arranged between the front spray pre-washing module (3) and the rear deep purifier (5), the core biological purifier (4) includes a biological reaction module (41) and a middle filter module (42), the biological reaction module (41) includes a flow guide grid (411), a rotating drum biological reactor (412) and a nutrient solution circulating pipe (413), the nutrient solution circulating pipe (413) is connected between a plurality of rotating drum biological reactors (412), the rotating drum biological reactor (412) is arranged in the flow guide grid (411), and the rotating drum biological reactor (412) includes a transmission gear one (41223); The middle filter module (42) includes a rigid frame (421) and a dynamic anti-blocking unit (422), the flow guide grid (411) and the dynamic anti-blocking unit (422) are arranged in the rigid frame (421), the dynamic anti-blocking unit (422) includes a mesh belt (4223), a driving member (4221), a transmission gear two (4224) and a roller pipe (4222), the mesh belt (4223) is rotatably connected between two groups of roller pipes (4222), the driving member (4221) is used for controlling the rotation of the roller pipe (4222), the core biological purifier (4) is arranged on the inner side of the mesh belt (4223), the transmission gear two (4224) is fixedly arranged on the surface of the roller pipe (4222), and the transmission gear one (41223) and the transmission gear two (4224) are in transmission connection with the mesh belt (4223).

2. An air filtration apparatus for a spray booth as defined in claim 1, wherein, The rotating drum biological reactor (412) further includes an outer mesh cover (4121) and a biological reaction carrier (4122), the outer mesh cover (4121) is sleeved outside the biological reaction carrier (4122), the biological reaction carrier (4122) includes a core pipe (41221), an inner mesh core (41222), drip irrigation holes (41225) and a protruding structure (41226), the inner mesh core (41222) is fixedly sleeved on the surface of the core pipe (41221), the surface of the core pipe (41221) is provided with the drip irrigation holes (41225), the two ends of the core pipe (41221) are connected with the nutrient solution circulating pipe (413), the protruding structure (41226) is arranged on the inner side of the inner mesh core (41222), and the transmission gear one (41223) is fixedly connected with the core pipe (41221).

3. An air filtration apparatus for a spray booth as defined in claim 2, wherein, The inner mesh core (41222) includes an annular mesh core and a radial mesh plate, a plurality of radial mesh plates are annularly arranged on the circumferential side of the annular mesh core, the protruding structure (41226) is arranged on the surface of the radial mesh plate, and the inner side of the outer mesh cover (4121) is provided with an axial groove, and the radial mesh plate is embedded in the axial groove.

4. An air filtration apparatus for a spray booth as claimed in claim 3, wherein, The biological reaction carrier (4122) further includes a moisture sponge (41224), and the moisture sponge (41224) is filled between the core pipe (41221) and the annular mesh core.

5. An air filtration apparatus for a spray booth as defined in claim 1, wherein, The surface of the roller pipe (4222) is provided with a water spraying hole (4225), and the two ends of the roller pipe (4222) are connected with a cleaning liquid circulating pipe (423).

6. An air filtration apparatus for a spray booth as defined in claim 1, wherein, The air purification tower (1) is provided below with a sewage collecting pool (11), and above with a purified gas discharge pipe (13), and on the side with a drainage channel (12) and a containing bin (14), the communication part of the drainage channel (12) with the sewage collecting pool (11) is distributed below the front spray pre-washing module (3), the core biological purifier (4) is filled in the containing bin (14), and a sealing cover (6) is arranged at the opening of the containing bin (14).

7. An air filtration apparatus for a spray booth as claimed in claim 6, wherein, The rigid frame (421) is fixedly provided with a cleaning piece (4211) at a position corresponding to the drainage channel (12), and the lower surface of the mesh belt (4223) is in sliding contact with the cleaning piece (4211).

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