Fiberboard drying processing waste gas treatment system

Abstract

The invention discloses a fiberboard drying processing waste gas treatment system, which relates to the technical field of waste gas treatment, and specifically comprises a flow guide assembly, a purification assembly and a discharge assembly which are continuously arranged, on one hand, a gradient pretreatment module comprising three-stage treatment of humidity regulation and control, fiber interception and spray liquid dynamic filtration is combined with a synergistic structure of a biological purification layer, wet static electricity and intelligent spraying to jointly form a composite purification effect, so that waste gas generated in fiberboard drying processing aims at the problem of mismatching of gas-liquid countercurrent, and waste gas generated in fiberboard drying processing can be purified; generated entrainment is eliminated, and pollution gas is prevented from escaping; on the other hand, in the fiber interception treatment process, active regulation and control of the liquid-gas ratio are completed by dynamically changing the staggered positions of the filler layers, it is ensured that the ratio of fiber-containing waste gas to dust-containing spraying liquid can be kept constant, and the blocking probability of the biological filler layers is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of waste gas treatment, and particularly relates to a waste gas treatment system for fiberboard drying and processing. Background Art

[0002] The waste gas generated during the fiberboard drying and processing contains pollutants such as dust particles, formaldehyde, VOCs, and sulfides. Most traditional waste gas treatment systems use single spraying or mechanical filtration (such as cyclone dust collectors), referring to the content disclosed in Patent Publication No. CN110252059A;

[0003] Specifically, a three-layer spraying layout is adopted, but the gas-liquid countercurrent matching is not considered. The entrainment of mist generated when the liquid-gas ratio exceeds the limit will cause secondary emission of VOCs gas, and the ineffective interception of large-particle fibers will cause the blockage of spray heads;

[0004] Another example is the content disclosed in Patent Publication No. CN1147974281A, which uses a purification tank with preset water for waste gas purification, but ignores that the direct mixing of high-humidity waste gas with the purification unit will cause the blockage of biological fillers (agents), thereby affecting the waste gas purification efficiency;

[0005] Therefore, in view of the above-mentioned technical defects, the present invention proposes a solution. Summary of the Invention

[0006] The purpose of the present invention is to provide a waste gas treatment system for fiberboard drying and processing, which is used to solve the problems of the escape of polluted gas caused by the failure of gas-liquid countercurrent and the entrainment of mist, and the incomplete purification of waste gas caused by the blockage of biological fillers.

[0007] The purpose of the present invention can be achieved by the following technical solutions: A waste gas treatment system for fiberboard drying and processing includes a continuously arranged diversion component, a purification component, and an emission component;

[0008] The diversion component includes an air inlet pipe arranged on one side of the bottom of the tank body. A first spray pipe is arranged in the upper-middle part of the air inlet pipe. The bottom of the air inlet pipe penetrates horizontally into the tank body and is internally provided with a tapered rod. A spiral guide plate that fits with the inner wall of the air inlet pipe and is used for centrifugally guiding the preliminarily sprayed dust-containing liquid is sleeved outside the tapered rod;

[0009] The purification component includes a packing structure and a wet electrostatic precipitator component which are stacked from bottom to top. The packing structure includes a lower packing disc and an upper packing disc which are rotatably arranged. A lower packing layer and an upper packing layer which are arranged at intervals are installed in the lower packing disc and the upper packing disc. The wet electrostatic precipitator component includes longitudinally arranged dust plates and transversely arranged dust plates which are distributed in an array. An adsorption area A and an adsorption area B are respectively formed between a pair of adjacent longitudinally arranged dust plates and transversely arranged dust plates. The tank body is respectively provided with a second spray pipe and a third spray pipe above the packing structure and the wet electrostatic precipitator component.

[0010] The discharge component includes an exhaust hood arranged on the tank body and a return pipe communicated with the air draft pipe.

[0011] It is further set that: an air inlet pipe for the dust-containing waste gas to pass through is installed at the upper end of the air draft pipe, and the air inlet pipe, the air draft pipe and the return pipe are communicated with each other.

[0012] It is further set that: the lower packing disc and the upper packing disc have the same structure, and air permeation holes are respectively arranged on the inner sides of the lower packing disc and the upper packing disc corresponding to the lower packing layer and the upper packing layer. A reversing middle cylinder is jointly installed in the middle of the lower packing disc and the upper packing disc, and a matching hole corresponding to the air permeation hole is arranged on the reversing middle cylinder.

[0013] It is further set that: arc-shaped toothed plates are installed outside the lower packing disc and the upper packing disc and extend to the outside of the tank body. Motors are respectively installed on the air draft pipe corresponding to the outside of the lower packing disc and the upper packing disc, and driving teeth respectively meshing with the arc-shaped toothed plates are installed at the output ends of the motors.

[0014] It is further set that: a group of lower packing layers in the upper position and a group of upper packing layers in the lower position are arranged in a staggered manner, and the upper surfaces of the lower packing layer and the upper packing layer are smooth centripetal curved surfaces.

[0015] It is further set that: a dust collecting pipe connected with the reversing middle cylinder is installed at one end of the air draft pipe extending into the tank body, and a first return pipe and a second return pipe extending to the outside of the tank body are sequentially penetrated through the lower end of the dust collecting pipe.

[0016] It is further set that: both the second spray pipe and the third spray pipe are net-shaped pipe body structures, the pipe body structures on the second spray pipe and the third spray pipe are arranged in a vertical staggered manner, and the first spray pipe, the second spray pipe and the third spray pipe are all connected with a water supply device.

[0017] It is further set that: an exhaust pipe for discharging clean gas is installed at the upper end of the exhaust hood.

[0018] The present invention also proposes a method for treating waste gas in fiber board drying and processing, including the following contents: a purification treatment process combining the diversion and transportation of dust-containing gas, biological purification and wet electrostatic precipitation.

[0019] The present invention has the following beneficial effects:

[0020] 1. The present invention aims at the problems of the escape of polluted gas caused by entrainment of mist due to the failure of gas-liquid countercurrent and the incomplete purification of waste gas caused by the blockage of biological fillers. On the one hand, a gradient pretreatment module including three-stage treatment of humidity control, fiber interception and dynamic filtration of spray liquid, combined with a synergistic action structure of biological purification layer + wet electrostatic + intelligent spray, jointly constitutes a composite purification effect, so that the waste gas from fiber board drying processing eliminates the generation of mist and prevents the escape of polluted gas for the mismatch problem of gas-liquid countercurrent. On the other hand, in the process of fiber interception treatment, by dynamically changing the staggered position of the packing layer, the active regulation of the liquid-gas ratio is completed, so as to ensure that the ratio between the waste gas containing fibers and the dust-containing spray liquid can be kept constant, and the probability of blockage of the biological packing layer is reduced.

[0021] 2. Through the joint setting of the first spray pipe, the second spray pipe and the second spray pipe, the dust-containing waste gas can obtain a three-stage spray effect. The staggered spray setting method can complete comprehensive spraying in the stages of waste gas pretreatment, biological purification and fiber interception, increasing the cooling efficiency and the sedimentation efficiency of large fiber dust particles entering the waste gas treatment system; the adsorption areas A and B respectively formed by the wet electrostatic dust removal components simultaneously adsorb the dust in the dust-containing gas-liquid. The longitudinally arranged dust plates and the transversely arranged dust plates with staggered distribution are used to make the flue gas form a turbulent flow when passing through, further increasing the collision and adsorption opportunities between the dust and the electrode plates, preventing the escape phenomenon when the polluted gas is finer, and improving the purification efficiency of the dust-containing waste gas;

[0022] 3. Through the setting of the commutation middle cylinder, the motor drives the arc-shaped tooth plate to rotate through the driving teeth, and the arc-shaped tooth plate respectively drives the lower packing disc and the upper packing disc to rotate. After the lower packing disc and the upper packing disc outside the commutation middle cylinder complete rotations in different directions, the matching holes on the commutation middle cylinder respectively intersect and correspond to the air-permeable holes on the lower packing disc and the upper packing disc, changing the passing area between the matching holes and the air-permeable holes, and finally realizing the regulation of the liquid-gas ratio. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0024] Figure 1 It is a schematic structural diagram of the present invention;

[0025] Figure 2Schematic cross-sectional structure diagram of the present invention;

[0026] Figure 3 Partial structure cut-away view of the present invention;

[0027] Figure 4 Schematic diagram of the partial structure disassembly of the packing disc of the present invention;

[0028] Figure 5 Distribution structure diagram of the dust suction plates of the wet electrostatic dust removal assembly of the present invention;

[0029] Figure 6 Schematic cut-away view of the installation structure of the spiral guide vane of the present invention;

[0030] Figure 7 Top view schematic diagram of the second spray pipe and the third spray pipe of the present invention;

[0031] Figure 8 Structure diagram of the commutation middle cylinder of the present invention.

[0032] In the figure: 1, tank body; 2, exhaust hood; 3, exhaust pipe; 4, intake pipe; 5, air guide pipe; 6, return air pipe; 7, dust collection pipe; 8, commutation middle cylinder; 9, lower packing disc; 10, upper packing disc; 11, second spray pipe; 12, wet electrostatic dust removal assembly; 121, longitudinal dust plate; 122, transverse dust plate; 13, third spray pipe; 14, first spray pipe; 15, first return pipe; 16, second return pipe; 17, conical rod; 18, spiral guide plate; 19, motor; 20, driving gear; 21, lower packing layer; 22, upper packing layer; 23, air leakage hole; 24, arc-shaped toothed plate; 25, mating hole; 26, splash top. Specific embodiments

[0033] Next, the technical solutions of the present invention will be clearly and completely described in conjunction with the embodiments. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0034] Embodiment 1: In view of the problems of the loss of gas-liquid countercurrent efficiency, resulting in the entrainment of mist and the escape of polluted gas, as well as the blockage of biological packing and incomplete purification of waste gas, the following technical solutions are proposed:

[0035] Refer to Figure 1 - Figure 8As shown in the figure, an exhaust gas treatment system for fiberboard drying and processing in this embodiment includes a continuously arranged diversion component, a purification component, and an emission component. The diversion component includes an air intake pipe 5 arranged on one side of the bottom of the tank body 1. A first spray pipe 14 is arranged in the upper middle part of the air intake pipe 5. The bottom of the air intake pipe 5 penetrates horizontally into the tank body 1 and is internally provided with a tapered rod 17. A spiral guide plate 18 that fits with the inner wall of the air intake pipe 5 and is used for centrifugally guiding the preliminarily sprayed dust-containing liquid is sleeved outside the tapered rod 17;

[0036] With the setting of the spiral guide plate 18, after the waste gas is introduced, the gas first moves from the middle to the periphery by the tapered rod 17. Further, under the spiral guiding action of the spiral guide plate 18, the air flow generates centrifugal force, and together with the three-stage spraying, an effective gradient spraying effect is formed, improving the fiber removal rate;

[0037] Refer to Figure 2 - Figure 5 As shown in the figure, the purification component includes a packing structure and a wet electrostatic precipitator component 12 stacked from bottom to top. The packing structure includes a lower packing disk 9 and an upper packing disk 10 arranged to rotate. Lower packing layers 21 and upper packing layers 22 are installed in the lower packing disk 9 and the upper packing disk 10 at intervals;

[0038] The wet electrostatic precipitator component 12 includes longitudinally arranged dust plates 121 and transversely arranged dust plates 122 distributed in an array. An adsorption area A and an adsorption area B are respectively formed between a pair of adjacent longitudinally arranged dust plates 121 and transversely arranged dust plates 122. Among them, discharge electrodes (not shown in the figure) connected to a high-voltage rectifier transformer are arranged between each group of longitudinally arranged dust plates 121 and transversely arranged dust plates 122, so that the adjacent sides of each group of longitudinally arranged dust plates 121 and transversely arranged dust plates 122 carry electrons, and finally the dust in the dust-containing gas is collected;

[0039] The tank body 1 is respectively provided with a second spray pipe 11 and a third spray pipe 13 above the packing structure and the wet electrostatic precipitator component 12; The emission component includes an exhaust hood 2 arranged on the tank body 1 and a return air pipe 6 communicated with the air intake pipe 5;

[0040] Refer to Figure 2 and Figure 3 As shown in the figure, one end of the air intake pipe 5 extending into the tank body 1 is installed with a dust collecting pipe 7 connected to a commutation middle cylinder 8. The lower end of the dust collecting pipe 7 sequentially penetrates through a first return pipe 15 and a second return pipe 16 extending outside the tank body 1. The spray waste liquid in the waste gas purification process is moved to a wastewater treatment biological pond through the first return pipe 15 and the second return pipe 16 for biological purification treatment. The purpose of continuously arranging the first return pipe 15 and the second return pipe 16 on the channel is to collect the dust-containing waste liquid in sections and avoid blockage caused by centralized discharge;

[0041] Refer to Figure 3 and Figure 7As shown, both the second spray pipe 11 and the third spray pipe 13 are reticular pipe structures. The pipe structures on the second spray pipe 11 and the third spray pipe 13 are vertically staggered, and the first spray pipe 14, the second spray pipe 11, and the third spray pipe 13 are all connected to the water supply device;

[0042] Referring to Figure 1 - Figure 3 As shown, an intake pipe 4 for the entry of dust-containing waste gas is installed at the upper end of the air extraction pipe 5. The intake pipe 4, the air extraction pipe 5, and the return pipe 6 are connected. An exhaust pipe 3 for the discharge of clean gas is installed at the upper end of the exhaust hood 2. A control valve (not shown in the figure) for on-off control is installed on the return pipe 6 among them. After the dust-containing waste gas enters, it successively passes through the air extraction pipe 5 and the dust collection pipe 7 into the tank body 1, and then is discharged through the exhaust pipe 3 after purification treatment, and the emission of clean gas complies with relevant emission regulations.

[0043] Basic principle: The waste gas from the drying and processing of fiberboard enters the treatment system. It is jointly composed of a gradient pretreatment module with three-level treatment including humidity regulation, fiber interception, and dynamic filtration of the spray liquid, combined with a collaborative action structure of a biological purification layer + wet electrostatic + intelligent spray, forming a composite purification effect. This enables the waste gas from the drying and processing of fiberboard to eliminate the generation of mist and prevent the escape of polluted gas for the problem of mismatch in gas-liquid countercurrent;

[0044] It should be supplemented and explained that: The longitudinal dust plates 121 and the transverse dust plates 122 included in the wet electrostatic dust removal component 12 respectively form the adsorption zones A and B, which simultaneously adsorb the dust in the dust-containing gas-liquid. The longitudinally and transversely misaligned dust plates 121 and 122 are to make the flue gas form a turbulent flow when passing through, further increasing the collision and adsorption opportunities between the dust and the electrode plates, preventing the escape phenomenon when the polluted gas is relatively fine, and improving the purification efficiency of the dust-containing waste gas;

[0045] Moreover, with the joint setting of the first spray pipe 14, the second spray pipe 11, and the second spray pipe 13, the dust-containing waste gas can obtain a three-level spray effect. The staggered spray setting method can complete comprehensive spraying in the waste gas pretreatment, biological purification, and fiber interception stages, increasing the cooling efficiency and the sedimentation efficiency of large fiber dust particles entering the waste gas treatment system.

[0046] Embodiment 2: Based on Embodiment 1, for the problem of how the packing structure dynamically changes to adapt to the gas-liquid countercurrent matching, the following technical solutions are proposed:

[0047] Referring to Figure Figure 3 and Figure 4As shown in the figure, the structures of the lower packing tray 9 and the upper packing tray 10 are the same. The lower packing tray 9 and the upper packing tray 10 are respectively provided with air leakage holes 23 on the inner sides corresponding to the lower packing layer 21 and the upper packing layer 22. A reversing middle cylinder 8 is commonly installed in the middle of the lower packing tray 9 and the upper packing tray 10. The reversing middle cylinder 8 is provided with a matching hole 25 corresponding to the air leakage hole 23. Arc-shaped toothed plates 24 are installed outside the lower packing tray 9 and the upper packing tray 10 extending to the outside of the tank body 1.

[0048] Motors 19 are installed on the outside of the air inlet pipe 5 corresponding to the lower packing tray 9 and the upper packing tray 10 respectively. The output ends of the motors 19 are installed with driving teeth 20 respectively meshing with the arc-shaped toothed plates 24. A group of lower packing layers 21 in the upper position and a group of upper packing layers 22 in the lower position are arranged in an interleaved manner. The upper surfaces of the lower packing layer 21 and the upper packing layer 22 are smooth centripetal curved surfaces. The anti-splash setting of the dust-containing spray liquid is completed by the smooth centripetal curved surfaces of the lower packing layer 21 and the upper packing layer 22, so that the dust-containing waste liquid is concentrated and the mixing impact with the upward air flow is completed, improving the waste gas purification efficiency.

[0049] Structural advantages: During the fiber interception treatment process, the active regulation of the liquid-gas ratio is completed by dynamically changing the interleaved position of the packing layers, ensuring that the ratio between the fiber-containing waste gas and the dust-containing spray liquid can remain constant, reducing the probability of blockage of the biological packing layer. The specific regulation method is as follows:

[0050] The motor 19 drives the arc-shaped toothed plate 24 to rotate through the driving tooth 20. The arc-shaped toothed plate 24 drives the lower packing tray 9 and the upper packing tray 10 to rotate respectively. After the lower packing tray 9 and the upper packing tray 10 outside the reversing middle cylinder 8 complete rotations in different directions, the matching holes 25 on the reversing middle cylinder 8 and the air leakage holes 23 on the lower packing tray 9 and the upper packing tray 10 are staggered and corresponding respectively, changing the passing area between the matching hole 25 and the air leakage hole 23, and finally realizing the adjustment of the gas-liquid ratio.

[0051] It should be noted importantly that the adjustment of the above gas-liquid ratio is based on the pre-interleaved setting of the lower packing layer 21 and the upper packing layer 22. The microbial strains inoculated in the lower packing layer 21 and the upper packing layer 22 can effectively absorb and decompose pollutants such as sulfides, formaldehyde, and VOCs in the dust-containing waste gas. During the absorption process, the dust-containing waste gas passes upward through the matching hole 25 in the reversing middle cylinder 8, the air leakage holes 23 on the upper packing tray 10 and the lower packing tray 9 into the lower packing layer 21 and the upper packing layer 22, and then continues to pass upward into the wet electrostatic dust removal assembly 12 to complete the dust removal step.

[0052] Embodiment 3: Combining Embodiment 1 and Embodiment 2, this embodiment constitutes a method for drying and processing waste gas of fiberboard, including the following contents:

[0053] Step 1: Diversion and transportation of dust-containing gas: The dust-containing waste gas is introduced through the intake pipe 4 and then enters the tank body 1 through the air guiding pipe 5 and the dust collecting pipe 7 in sequence. The gas after purification treatment is discharged through the exhaust pipe 3, and the gas that is not completely purified returns to the air guiding pipe 5 through the return pipe 6 to continue a purification process, achieving cyclic purification treatment until it meets the emission standard and then completing the emission;

[0054] Step 2: Biological purification process: The motor 19 drives the arc-shaped tooth plate 24 to rotate through the driving gear 20, and the arc-shaped tooth plate 24 drives the lower packing tray 9 and the upper packing tray 10 to rotate respectively. After the lower packing tray 9 and the upper packing tray 10 outside the commutation middle cylinder 8 complete rotations in different directions, the matching holes 25 on the commutation middle cylinder 8 are respectively staggered and corresponding to the air permeable holes 23 on the lower packing tray 9 and the upper packing tray 10, thereby changing the passing area between the matching holes 25 and the air permeable holes 23, and finally realizing the adjustment of the gas-liquid ratio;

[0055] Among them, the adjustment of the gas-liquid ratio is based on the pre-staggered setting of the lower packing layer 21 and the upper packing layer 22. The microbial strains inoculated in the lower packing layer 21 and the upper packing layer 22 can effectively absorb and decompose pollutants such as sulfides, formaldehyde, and VOCs in the dust-containing waste gas. During the absorption process, the dust-containing waste gas passes upward through the matching holes 25 in the commutation middle cylinder 8, the air permeable holes 23 on the upper packing tray 10 and the lower packing tray 9 and enters the lower packing layer 21 and the upper packing layer 22. After absorption, it continues to pass upward into the wet electrostatic dust removal component 12 to complete the dust removal procedure;

[0056] Step 3: Wet electrostatic dust removal process: The adsorption zones A and B respectively formed by the longitudinal dust plates 121 and the transverse dust plates 122 included in the wet electrostatic dust removal component 12 simultaneously adsorb the dust in the dust-containing gas-liquid. Among them, the staggered distribution of the longitudinal dust plates 121 and the transverse dust plates 122 is to make the flue gas form a turbulent flow when passing through, further increasing the collision and adsorption opportunities between the dust and the electrode plates, preventing the escape phenomenon when the polluted gas is relatively fine, and improving the purification efficiency of the dust-containing waste gas.

[0057] To sum up: On the one hand, a gradient pretreatment module with three-level treatment including humidity control, fiber interception, and dynamic filtration of the spray liquid, combined with a collaborative action structure of a biological purification layer + wet electrostatic + intelligent spray, jointly constitutes a composite purification effect, so as to eliminate the generation of mist and prevent the escape of polluted gas for the problem of mismatch between gas-liquid countercurrent in the exhaust gas of fiber board drying and processing;

[0058] On the other hand, during the fiber interception process, the active regulation of the liquid-gas ratio is completed by dynamically changing the staggered position of the packing layer, ensuring that the ratio between the fiber-containing waste gas and the dust-containing spray liquid can remain constant, reducing the probability of clogging of the biological packing layer, so as to solve the problems of the escape of polluted gas caused by the failure of gas-liquid countercurrent and the entrainment of mist and the incomplete purification of waste gas caused by the clogging of biological packing, and improving the treatment efficiency of the waste gas from fiberboard drying and processing.

[0059] In the description of this specification, the descriptions referring to terms such as "one embodiment", "example", "specific example", etc. mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

Claims

1. A waste gas treatment system for fiberboard drying and processing, comprising a continuously arranged diversion component, a purification component, and an emission component, characterized in that: The diversion component includes an air intake pipe (5) arranged on one side of the bottom of the tank body (1). A first spray pipe (14) is arranged in the upper middle part of the air intake pipe (5). The bottom of the air intake pipe (5) horizontally penetrates into the tank body (1) and is internally provided with a tapered rod (17). A spiral guide plate (18) that fits the inner wall of the air intake pipe (5) and is used for centrifugally guiding the initially sprayed dust-containing liquid is sleeved outside the tapered rod (17); The purification component includes a packing structure and a wet electrostatic precipitator component (12) stacked from bottom to top. The packing structure includes a lower packing disk (9) and an upper packing disk (10) arranged to rotate. Lower packing layers (21) and upper packing layers (22) are installed at intervals in the lower packing disk (9) and the upper packing disk (10). The wet electrostatic precipitator component (12) includes longitudinally arranged dust plates (121) and transversely arranged dust plates (122) distributed in an array. Between a pair of adjacent longitudinally arranged dust plates (121) and transversely arranged dust plates (122), adsorption zones A and B are respectively formed. The tank body (1) is respectively provided with a second spray pipe (11) and a third spray pipe (13) above the packing structure and the wet electrostatic precipitator component (12); The emission component includes an exhaust hood (2) arranged on the tank body (1) and a return air pipe (6) communicated with the air intake pipe (5).

2. The waste gas treatment system for fiberboard drying and processing according to claim 1, characterized in that, The upper end of the air intake pipe (5) is installed with an intake pipe (4) for introducing dust-containing waste gas. The intake pipe (4), the air intake pipe (5), and the return air pipe (6) are communicated with each other.

3. The waste gas treatment system for fiberboard drying and processing according to claim 1, characterized in that, The lower packing disk (9) and the upper packing disk (10) have the same structure, and air-permeable holes (23) are respectively opened on the inner sides of the lower packing disk (9) and the upper packing disk (10) corresponding to the lower packing layer (21) and the upper packing layer (22). A reversing middle cylinder (8) is jointly installed in the middle parts of the lower packing disk (9) and the upper packing disk (10). The reversing middle cylinder (8) is provided with a matching hole (25) corresponding to the air-permeable hole (23).

4. The waste gas treatment system for fiberboard drying and processing according to claim 3, characterized in that, Arc-shaped toothed plates (24) are installed outside the lower packing disk (9) and the upper packing disk (10) and extend outside the tank body (1). Motors (19) are respectively installed on the air intake pipe (5) corresponding to the outside of the lower packing disk (9) and the upper packing disk (10). The output ends of the motors (19) are installed with driving teeth (20) respectively meshing with the arc-shaped toothed plates (24).

5. A fiberboard drying and processing waste gas treatment system according to claim 4, characterized in that, A group of lower packing layers (21) in the upper position and a group of upper packing layers (22) in the lower position are arranged in an intersecting manner. The upper surfaces of the lower packing layer (21) and the upper packing layer (22) are smooth centripetal curved surfaces.

6. The waste gas treatment system for fiberboard drying and processing according to claim 3, characterized in that, One end of the air intake pipe (5) extending into the tank body (1) is installed with a dust collecting pipe (7) connected to the reversing middle cylinder (8). The lower end of the dust collecting pipe (7) sequentially penetrates through a first return pipe (15) and a second return pipe (16) extending outside the tank body (1).

7. The waste gas treatment system for fiberboard drying and processing according to claim 1, characterized in that, The second spray pipe (11) and the third spray pipe (13) are both of a net-shaped pipe body structure. The pipe body structures on the second spray pipe (11) and the third spray pipe (13) are arranged vertically and staggeredly, and the first spray pipe (14), the second spray pipe (11) and the third spray pipe (13) are all connected to a water supply device.

8. A fiberboard drying and processing waste gas treatment system according to claim 1, characterized in that, An exhaust pipe (3) for discharging clean gas is installed at the upper end of the exhaust hood (2).

9. A method for treating waste gas from fiberboard drying and processing, which uses a waste gas treatment system for fiberboard drying and processing as described in any one of claims 1-8, characterized in that, It includes the following contents: the purification treatment process combining the diversion and transportation of dust-containing gas, biological purification and wet electrostatic precipitation.

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