Waste gas treatment device for recycled plastic hot melting workshop

Abstract

The invention discloses a waste gas treatment device for a reprocessed plastic hot melting workshop. The device consists of a waste gas collection unit, a pretreatment unit, a main treatment unit, a rear adsorption unit and a discharge unit, the pretreatment unit comprises a filter and a condenser, the main treatment unit is of a box type spraying structure and comprises a closed box body, the front end of the closed box body is connected with the condenser, and the rear end of the closed box body is connected with a discharging device; a structural cavity is formed in the position, behind the air inlet, of the closed box, a plurality of independent structural channels are formed in the section of the structural cavity, pipe cavity spraying units are assembled in the structural channels, ring sleeve interlayers are formed on the pipe cavity spraying units, waste gas circulation channels are formed in the inner sides of the ring sleeve interlayers, and the ring sleeve interlayers are externally connected with a spraying liquid supply device. And an atomizing nozzle for spraying the waste gas is arranged on the inner side of the exhaust pipe. The waste gas treatment device can effectively solve the problem of waste gas treatment of the regenerated plastic hot melting workshop, has the characteristics of high efficiency, energy conservation and environmental protection, and has important significance for promoting resource utilization of plastic wastes and environmental protection.

Description

Technical Field

[0001] The invention relates to the technical field of waste gas treatment in plastics manufacturing, and in particular to a waste gas treatment device for a hot-melt workshop of recycled plastics. Background Art

[0002] Plastics play an indispensable role in modern society and production. However, plastic waste has also led to serious environmental pollution and resource waste. At present, the recycling technology of waste plastics has attracted widespread attention because it not only helps to reduce the demand for raw materials and dependence on oil, but also reduces energy consumption and carbon dioxide emissions, thereby achieving the dual benefits of environmental and resource conservation. However, compared with new plastics, the composition of waste plastics is more complex, and the hot melt operation during the recycling process will produce a wider variety of organic waste gases. These organic waste gases mainly include dust particles, non-methane total hydrocarbons, dioxins and other harmful components, which pose a serious threat to the working environment and the atmospheric environment, so they must be effectively treated.

[0003] At present, the methods for treating plastic waste gas in the industry mainly include activated carbon adsorption and spray cycle purification:

[0004] The activated carbon adsorption method uses the strong attraction generated by a large number of molecules on the pore walls of activated carbon to capture and fix harmful macromolecular components from the gas mixture, so as to separate and remove them from the gas flow. However, the limitation of this method is that the total amount of adsorption of activated carbon is limited, and its adsorption capacity will gradually decrease over time. Once the activated carbon reaches the adsorption saturation state, it needs to be regenerated, which not only increases the processing cost and operation complexity, but also may cause secondary pollution during the regeneration process.

[0005] The spray circulation purification technology uses a liquid circulation system in the spray tower to achieve reverse contact reaction between the circulating liquid and the exhaust gas introduced from the bottom, effectively dissolving or reacting to remove harmful components in the exhaust gas. However, although the spray tower of the prior art has a large processing capacity, it has the disadvantages of large water consumption and low processing efficiency. At the same time, in actual operation, due to the fixed position of the spray head and the limited spray coverage, in order to expand the spray coverage area, it is usually necessary to install a larger spray head in the spray tower, which will not only further increase the water consumption, but may also interfere with the gas flow in the spray tower, thereby reducing the fluidity of the gas in the spray tower, thereby having a negative impact on the uniformity and processing efficiency of the gas treatment effect in the tower.

[0006] In view of this, it is particularly important to develop an efficient, energy-saving and environmentally friendly exhaust gas pretreatment device. Such a device can not only improve the efficiency of exhaust gas treatment, but also reduce operating costs and reduce negative impacts on the environment. Summary of the invention

[0007] The technical problem solved by the present invention is to provide a waste gas treatment device for a recycled plastic hot melt workshop to solve the defects in the above technical background.

[0008] The technical problem solved by the present invention is achieved by adopting the following technical solutions:

[0009] An exhaust gas treatment device for a recycled plastic hot melt workshop, comprising an exhaust gas collection device, a pretreatment unit, a main treatment unit, a post-adsorption unit and an exhaust device connected in sequence;

[0010] The pretreatment unit includes a filter and a condenser connected in sequence;

[0011] The main processing unit is a box-type spray structure, including a closed box body, the front end of which is provided with an air inlet for receiving a condenser, and the rear end is connected to a discharge device; the closed box body is formed with a structural cavity at the rear of the air inlet, and a plurality of independent structural channels are formed on the cross section of the structural cavity, and the structural channels are arranged in a dense array on the cross section of the structural cavity, and a tubular cavity spray unit is assembled in each structural channel in a plug-in manner;

[0012] The tubular cavity spray unit is formed with an annular sleeve interlayer that matches the cross-sectional contour size of the tubular cavity spray unit, and the tubular cavity spray unit uses the inner side of the annular sleeve interlayer as a waste gas flow channel; the annular sleeve interlayer is externally connected to a spray liquid supply device, and the tubular cavity spray unit is evenly provided with atomizing nozzles on the side walls of the waste gas flow channel, and the atomizing nozzles are connected to the annular sleeve interlayer and face the waste gas flow channel, and are used to perform atomizing spray treatment on the waste gas flowing through the channel.

[0013] As a further limitation, the exhaust gas collection device is an air collecting hood, and a negative pressure fan is arranged inside the air collecting hood as a power device; and the discharge device is an exhaust pipe or a smoke pipe or an air window, and a muffler is connected to the end of the discharge device to reduce the noise generated during discharge.

[0014] As a further limitation, the filter is one or a combination of a bag filter, a filter tank, and a combined filter box;

[0015] The filter tank is a closed structure, the filter tank body is filled with filtrate, a grid matching the interface size of the tank body is arranged in the middle of the tank body, the grid is filled with a combination of filter materials, and the combination of filter materials is arranged in layers, which are zeolite, activated carbon and ceramic balls from bottom to top; an air inlet pipe is arranged at the bottom of the filter tank, and an air outlet pipe is connected to the top;

[0016] The combined filter box is provided with a plurality of groups of structural filter frames along the flow direction of the exhaust gas, and different structural filter frames are respectively filled with one of glass wool, nylon fiber, large-size activated carbon particles, absorbent cotton, small-size activated carbon particles and viscose fiber.

[0017] As a further limitation, the post-adsorption unit is an activated carbon adsorption device, and the adsorption bed of the activated carbon adsorption device is designed as a multi-layer structure, and a gas distribution plate is provided between each adsorption bed layer to ensure that the exhaust gas passes through the activated carbon layer evenly.

[0018] As a further limitation, the main processing unit is provided with a smoke buffer structure at the position corresponding to the air inlet, and the smoke buffer structure includes an air inlet cavity and a buffer cavity, the air inlet cavity is a conical bucket-shaped structural cavity, the air inlet cavity is connected to the air inlet on the small mouth side, and is connected to the buffer cavity on the large mouth side; the buffer cavity is a variable volume cavity structure, the longitudinal section size is fixed, and the increase and decrease of volume is achieved by elongation and contraction along the length direction; a hollow plate frame is formed on the rear side of the buffer cavity, and a plurality of axial guide blades are evenly arranged on the plane of the hollow plate frame, and the buffer cavity is connected to the structural cavity through the hollow plate frame to evenly introduce the exhaust gas into the structural cavity.

[0019] As a further limitation, the cross-section of the structural channel is preferably a circle or a regular polygon.

[0020] As a further limitation, a structural fixing part is formed on the outer wall of the tubular cavity spray unit, and the tubular cavity spray unit is fixed in position by the structural fixing part after being inserted into the structural channel. The structural fixing part is a clamping groove or a clamping ring.

[0021] As a further limitation, the closed box body is further provided with a rear cover of a maintenance door that can be opened on the rear side of the corresponding closed box body, and the rear cover of the maintenance door can be opened as a whole to assemble, disassemble and replace the tubular cavity spray unit.

[0022] As a further limitation, the main processing unit is further provided with a photocatalyst plate at the rear of the structural cavity.

[0023] As a further limitation, the tubular cavity spray unit is an inclined structure in the closed box, and a liquid collection tank is reserved at the inclined bottom side of the closed box. The liquid collection tank is externally connected to a spray liquid recovery pipeline, and the spray wastewater generated during the exhaust gas treatment process is collected through the spray liquid recovery pipeline.

[0024] Beneficial effects: The waste gas treatment device for the recycled plastic hot melt workshop of the present invention takes into account the uniformity and efficiency of waste gas treatment in its structural design. It can effectively remove harmful components such as dust particles, non-methane total hydrocarbons, dioxins, etc. in the waste gas by adopting a multi-stage treatment unit, thereby significantly reducing the pollution to the working environment and the atmospheric environment. The main treatment unit in the multi-stage treatment unit can efficiently spray the waste gas that has been preliminarily filtered and cooled down through the optimized spray unit and structural channel design. It optimizes the traditional overall spray technology into a multi-point atomization spray in the multi-channel structure through an innovative multi-channel structure, effectively reducing the interference of gas flow and ensuring that the waste gas passes through the treatment unit evenly. This improvement significantly improves the contact efficiency between the waste gas and the spray liquid, thereby significantly improving the waste gas treatment efficiency and uniformity while reducing the amount of spray liquid. In addition, the modular design of the spray unit facilitates maintenance and replacement, reducing the complexity of operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the general assembly structure of a preferred embodiment of the present invention.

[0026] Figure 2 for Figure 1 Side cutaway view of the main processing unit.

[0027] Figure 3 for Figure 2 Front cross-sectional view of the central structural channel section.

[0028] Among them: 1. Waste gas collection device; 2. Pretreatment unit; 3. Main treatment unit; 4. Post-adsorption unit; 5. Discharge device; 6. Gas collection hood; 7. Equipment shell cavity; 8. Filter tank; 9. Grid; 10. Condenser; 11. Closed box; 12. Closed flange; 13. Prefabricated fixture seat; 14. Back cover of inspection door; 15. Adsorption bed; 16. Gas distribution plate; 17. Forced exhaust device; 18. Smoke pipe; 19. Inlet cavity; 20. Buffer cavity; 21. Flexible connection part; 22. Hollow plate frame; 23. Structural cavity; 24. Joint part; 25. Photocatalyst plate; 26. Liquid accumulation tank; 27. Structural cavity wall; 28. Ring sleeve interlayer; 29. ​​Waste gas flow channel; 30. Atomizing nozzle; 31. Tube cavity spray unit. DETAILED DESCRIPTION

[0029] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below with reference to specific diagrams.

[0030] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0031] In the following embodiments, it will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical terms and scientific terms) used herein have the same meaning as the general understanding of those skilled in the art to which this application belongs. It should also be understood that terms such as those defined in general dictionaries should be understood to have the same meaning as the meaning in the context of the prior art, and will not be interpreted with an idealized or overly formal meaning unless defined as herein.

[0032] See also Figure 1 to Figure 3 A waste gas treatment device for a recycled plastic hot melt workshop. In this embodiment, the waste gas treatment device includes a waste gas collecting device 1, a pretreatment unit 2, a main treatment unit 3, a post-adsorption unit 4 and a discharge device 5. The waste gas collecting device 1, the pretreatment unit 2, the main treatment unit 3, the post-adsorption unit 4 and the discharge device 5 are sequentially connected through an air supply pipeline. At the same time, technicians in this field can configure a wind pressure device such as a negative pressure fan at a selected position of the air supply pipeline according to actual needs to ensure that the waste gas can flow smoothly between the various structural units under the action of the wind pressure device.

[0033] The waste gas collection device 1 is responsible for collecting the waste gas generated by the hot melt workshop and then transporting it to the pretreatment unit 2 through the air supply pipeline. The waste gas collection device 1 includes a gas collection hood 6, and the gas collection hood 6 is formed with a device shell cavity 7 on the back side of the hood body. The device shell cavity 7 is encapsulated with a negative pressure fan. The waste gas collection device 1 can adjust the suction volume by adjusting the power of the negative pressure fan to meet the waste gas emission requirements under different production conditions. In order to improve the flexibility of the use of the gas collection hood 6, the air suction port of the gas collection hood 6 can also be designed to be a variable angle to ensure that the waste gas can be efficiently sucked in while reducing the impact on the workshop operators.

[0034] The pretreatment unit 2 usually includes a series of filtering and cooling equipment, which is used as a pre-treatment means to preliminarily purify the waste gas of the hot melt workshop, remove large particles in the waste gas and reduce the temperature of the waste gas, so as to reduce the load of the subsequent treatment unit and prepare for the subsequent treatment steps. The filtering equipment used in the pretreatment unit 2 can be selected according to the type and composition of the waste plastic to be treated, such as a bag filter, a filter tank 8 or a combined filter box, etc., and one of them can be selected, or a combination of multiple filtering equipment of different numbers can be used. Among them, the bag filter is the most common technical choice, which uses a series of filter bags to capture dust particles in the waste gas. The filter tank 8 is a closed structure, which is filled with filtrate. A grid 9 adapted to the interface size of the tank body is provided in the central position of the tank body. The grid 9 is filled with a combined filter material, which is arranged in layers, from bottom to top, zeolite, activated carbon and ceramic balls. The bottom of the filter tank 8 is provided with an air inlet pipe, and the top is connected to the air outlet pipe to ensure that the waste gas can be fully filtered and purified when passing through the filter tank. The combined filter box is provided with multiple groups of structural filter frames along the direction of exhaust gas flow, and each group of filter frames is filled with different types of filter materials to adapt to pollutants of different sizes and compositions in the exhaust gas. Specifically, multiple groups of structural filter frames can be provided in the combined filter box along the direction of exhaust gas flow, and each group of filter frames is filled with one of glass wool, nylon fiber, large-size activated carbon particles, absorbent cotton, small-size activated carbon particles and viscose fiber.

[0035] like Figure 1 As shown, in this embodiment, the filtering device used in the pretreatment unit 2 is a filter tank 8, and the design of the size of the filter tank 8 and the matching inlet and outlet pipes takes into account the flow rate and composition of the exhaust gas, ensuring that the exhaust gas can fully contact the filter material when passing through the filter tank, thereby effectively removing the particulate matter and some harmful gases therein. The corresponding cooling device is a condenser 10, which is used to reduce the temperature in the exhaust gas, so that organic compounds such as non-methane total hydrocarbons in the exhaust gas and water vapor brought into the filter tank 8 are condensed into liquid, which is convenient for subsequent processing. A cooling coil is provided inside the condenser 10, which reduces the exhaust gas temperature by circulating a cooling medium (such as water or refrigerant).

[0036] In another embodiment, in order to improve the condensation efficiency, the condenser 10 may be designed with multiple cooling sections, and the temperature of each cooling section may be independently controlled to meet the condensation requirements of exhaust gases with different components.

[0037] The filter tank 8 used in the pretreatment unit 2 is mainly used as a coarse-effect filtering structure as a filtering device. After the exhaust gas is processed by the pretreatment unit 2, the exhaust gas usually enters the main treatment unit 3, which is mainly responsible for further removing harmful substances in the exhaust gas.

[0038] The main treatment unit 3 is a box-type spray structure, including a closed box body 11 as the main structure, the right end of the closed box body 11 has an open surface, and the open surface is closed by a matching close-fitting flange 12 and an inspection door rear cover 14. The main treatment unit 3 is provided with an air inlet receiving the pretreatment unit on the front side of the closed box body 11, and an air outlet that can be connected to the rear adsorption unit 4 through an air supply pipeline is formed on the inspection door rear cover 14.

[0039] The internal structure of the main processing unit 3 when the rear cover 14 of the inspection door is closed is as follows: Figure 2 As shown, it specifically includes an air intake part and a processing part.

[0040] The air intake part of the main processing unit 3 includes an air intake chamber 19 and a buffer chamber 20. The air intake chamber 19 is a cone-shaped structure, the small mouth side of which is connected to the air intake port, and the large mouth side is connected to the buffer chamber 20. The buffer chamber 20 is a variable volume chamber structure that can be expanded and contracted laterally, and the longitudinal section size is fixed, and the volume of the buffer chamber 20 can be increased or decreased by extending and contracting along the length direction through adaptive pressure regulation. The buffer chamber 20 is formed with a flexible connection part 21 on the air outlet side, and the flexible connection part 21 has a size smaller than the longitudinal section of the buffer chamber 20, and can be extended and shortened with the expansion and contraction of the buffer chamber 20. A hollow plate frame 22 is formed on the rear side of the flexible connection part 21. The position of the hollow plate frame 22 in the closed box 11 is fixed. A number of axial guide blades are evenly arranged on the plane of the hollow plate frame 22. The buffer cavity 20 is connected to the structural cavity through the hollow plate frame 22 to evenly introduce the exhaust gas into the structural cavity 23 at the rear of the closed box 11.

[0041] The processing part of the main processing unit 3 is a combination of a tube cavity spray unit 31 and a photocatalyst plate 25. The main processing unit 3 is formed with a plurality of independent structural channels at the position of the structural cavity 23. These structural channels are arranged in a dense array on the cross section of the structural cavity. A single structural channel is a regular hexagon on the cross section perpendicular to the forward direction of the exhaust gas flow, and each structural channel 23 is equipped with a tube cavity spray unit 31 matching the size of the structural channel in a plug-in manner (see Figure 3). The tubular cavity spray unit 31 is formed with an annular sleeve interlayer 28 that matches the cross-sectional profile of the tubular cavity spray unit 31. The tubular cavity spray unit 31 uses the inner side of the annular sleeve interlayer 28 as the exhaust gas flow channel 29. The annular sleeve interlayer 28 is externally connected to a spray liquid supply device. The tubular cavity spray unit 31 is evenly arranged with atomizing nozzles 30 on the side wall of the exhaust gas flow channel 29. The atomizing nozzles 30 are connected to the annular sleeve interlayer 28 and face the exhaust gas flow channel 29. They are used to perform atomizing spray treatment on the exhaust gas flowing through the exhaust gas flow channel 29. The spray liquid used in the atomizing spray treatment can be prepared by a technician with chemical professional ability. By adding specific chemical components, it can react chemically with harmful components in the exhaust gas and convert them into harmless or low-harm substances.

[0042] The corresponding photocatalyst plate 25 is arranged on the rear side of the structural cavity 23, and is used to deeply purify the exhaust gas after being treated by the tubular cavity spray unit 31. The photocatalyst plate 25 uses photocatalytic oxidation technology to activate the catalyst with the help of a light source of a specific wavelength, thereby generating highly oxidizing free radicals. These free radicals can effectively decompose harmful substances in the exhaust gas and enhance the thoroughness of the exhaust gas treatment.

[0043] In this embodiment, the tubular cavity spray unit 31 is a structure that is tilted downward from front to back in the closed box 11. The closed box 11 is provided with a liquid collection tank 26 at the oblique bottom side. The atomized spray waste liquid generated during the operation of the tubular cavity spray unit 31 can flow into the liquid collection tank 26 along the inclined surface. The liquid collection tank 26 is externally connected to a spray liquid recovery pipeline, and the spray waste water generated during the waste gas treatment process is collected through the spray liquid recovery pipeline. Such a design can effectively recycle the spray liquid, reduce resource waste, and avoid environmental pollution caused by waste water.

[0044] In other embodiments, the corresponding structural channel cross-section in the structural cavity 23 may also be a circle or other regular polygon, the purpose of which is to ensure the flow uniformity of the exhaust gas when passing through the structural channel 23, while reducing the flow resistance and improving the processing efficiency.

[0045] In addition, a structural fixing part is formed on the outer wall of the tubular cavity spray unit 31. After the tubular cavity spray unit 31 is inserted into the structural channel 23, the position is fixed by the structural fixing part. The structural fixing part can be a clamping groove or a clamping ring, which can ensure the stability of the spray unit 30 and facilitate maintenance. In addition, the joint part 24 between the closed box body 11 and the rear cover 14 of the inspection door is formed with the regional position between the tubular cavity spray unit 31 and the photocatalyst plate 25, so that after the rear cover 14 of the inspection door is opened, the technical purpose of assembling, disassembling and replacing the tubular cavity spray unit 31 and the photocatalyst plate 25 can be achieved at the same time. Such a design not only facilitates daily maintenance work, but also reduces maintenance costs.

[0046] The quality of the waste gas treated by the main treatment unit 3 has been significantly improved, but in order to further ensure that the exhaust gas meets the environmental protection standards, the waste gas needs to be deeply treated by the post-adsorption unit 4. The post-adsorption unit 4 usually includes one or more adsorption beds 15 (four adsorption beds 15 are used in this embodiment), and these adsorption beds are filled with activated carbon of different particle sizes as adsorption materials, which can further adsorb harmful substances that have not been completely removed in the previous operation steps, and a gas distribution plate 16 is provided between adjacent adsorption beds 15 to ensure that the waste gas passes through the activated carbon layer arranged on the adsorption bed 15 evenly.

[0047] The single adsorption bed 15 can be designed as a single layer or multi-layer structure to meet different processing requirements and improve adsorption efficiency. In some embodiments, the adsorption bed 15 can also be designed to be regenerable, that is, the adsorbate on the adsorption material is removed by heating or chemical treatment, so as to achieve the reuse of the adsorption material and reduce the operating cost.

[0048] In the adsorption bed 15, after the harmful substances in the exhaust gas are effectively adsorbed, the clean gas is discharged through the exhaust device 5 and released into the atmosphere. In this embodiment, the exhaust device 5 is a smoke pipe 18, and in order to ensure the stability of the exhaust of the entire exhaust gas treatment device, the device is also provided with a forced exhaust device 17 between the post-adsorption unit 4 and the smoke pipe 18. The device can be started when necessary to force the exhaust gas in the exhaust gas treatment system to prevent equipment damage caused by excessive internal pressure of the system.

[0049] In other different embodiments, the discharge device 5 can be other exhaust structures (such as exhaust pipes, air windows, etc.) in addition to the smoke pipe 18, or a composite device of an exhaust structure and a muffler. In addition, the discharge device can also be equipped with an online monitoring system, through which the composition and concentration of the exhaust gas can be monitored in real time to ensure that the emission meets national or local environmental protection requirements.

[0050] In order to improve the stability of the device operation and ensure the efficiency and safety of waste gas treatment, the operation of the entire waste gas treatment device is monitored and managed by the control system. The control system includes various sensors and actuators for real-time monitoring of waste gas composition, temperature, pressure and other parameters, and automatically adjusts the working status of each treatment unit according to these parameters to ensure the waste gas treatment efficiency and stable operation of the system. The control system can also be connected to the central control room of the factory to achieve remote monitoring and operation and improve management efficiency.

[0051] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A waste gas treatment device for a recycled plastic hot melt workshop, characterized in that: It includes an exhaust gas collection device, a pre-treatment unit, a main treatment unit, a post-adsorption unit and an emission device connected in sequence; The pretreatment unit includes a filter and a condenser connected in sequence; The main processing unit is a box-type spray structure, including a closed box body, the front end of which is provided with an air inlet for receiving a condenser, and the rear end is connected to a discharge device; the closed box body is formed with a structural cavity at the rear of the air inlet, and a plurality of independent structural channels are formed on the cross section of the structural cavity, and the structural channels are arranged in a dense array on the cross section of the structural cavity, and a tubular cavity spray unit is assembled in each structural channel in a plug-in manner; The tubular cavity spray unit is formed with an annular sleeve interlayer that matches the cross-sectional contour size of the tubular cavity spray unit, and the tubular cavity spray unit uses the inner side of the annular sleeve interlayer as a waste gas flow channel; the annular sleeve interlayer is externally connected to a spray liquid supply device, and the tubular cavity spray unit is evenly provided with atomizing nozzles on the side walls of the waste gas flow channel, and the atomizing nozzles are connected to the annular sleeve interlayer and face the waste gas flow channel, and are used to perform atomizing spray treatment on the waste gas flowing through the channel.

2. The waste gas treatment device for a recycled plastic hot melt workshop according to claim 1 is characterized in that: The exhaust gas collecting device is an air collecting hood, and a negative pressure fan is arranged inside the air collecting hood as a power device; and the exhaust device is an exhaust pipe or a smoke pipe or an air window, and a muffler is connected to the end of the exhaust device.

3. The waste gas treatment device for a recycled plastic hot melt workshop according to claim 1 is characterized in that: The filter is one or a combination of a bag filter, a filter tank, and a combined filter box; The filter tank is a closed structure, the filter tank body is filled with filtrate, a grid matching the interface size of the tank body is arranged in the middle of the tank body, the grid is filled with a combination of filter materials, and the combination of filter materials is arranged in layers, which are zeolite, activated carbon and ceramic balls from bottom to top; an air inlet pipe is arranged at the bottom of the filter tank, and an air outlet pipe is connected to the top; The combined filter box is provided with a plurality of groups of structural filter frames along the flow direction of the exhaust gas, and different structural filter frames are respectively filled with one of glass wool, nylon fiber, large-size activated carbon particles, absorbent cotton, small-size activated carbon particles and viscose fiber.

4. The waste gas treatment device for a recycled plastic hot melt workshop according to claim 1 is characterized in that: The post-adsorption unit is an activated carbon adsorption device, and the adsorption bed of the activated carbon adsorption device is designed as a multi-layer structure. A gas distribution plate is provided between each adsorption bed layer to ensure that the exhaust gas passes through the activated carbon layer evenly.

5. The waste gas treatment device for a recycled plastic hot melt workshop according to claim 1 is characterized in that: The main processing unit is provided with a smoke buffer structure at the position corresponding to the air inlet, and the smoke buffer structure includes an air inlet cavity and a buffer cavity. The air inlet cavity is a cone-shaped structural cavity, which is connected to the air inlet on the small mouth side and is connected to the buffer cavity on the large mouth side; the buffer cavity is a variable volume cavity structure with a fixed longitudinal section size, and the increase and decrease of volume is achieved by elongating and contracting along the length direction; a hollow plate frame is formed on the rear side of the buffer cavity, and a plurality of axial guide blades are evenly arranged on the plane of the hollow plate frame, and the buffer cavity is connected to the structural cavity through the hollow plate frame to evenly introduce the exhaust gas into the structural cavity.

6. The waste gas treatment device for a recycled plastic hot melt workshop according to claim 1 is characterized in that: The cross section of the structural channel is circular or regular polygonal.

7. The waste gas treatment device for a recycled plastic hot melt workshop according to claim 1, characterized in that: A structural fixing part is formed on the outer wall of the tubular cavity spray unit. After the tubular cavity spray unit is inserted into the structural channel, the position is fixed by the structural fixing part, and the structural fixing part is a clamping groove or a clamping ring.

8. The waste gas treatment device for a recycled plastic hot melt workshop according to claim 1 is characterized in that: The closed box body is also provided with a rear cover of an inspection door that can be opened on the rear side of the corresponding closed box body. The rear cover of the inspection door can be opened as a whole to perform assembly, disassembly and replacement operations on the tubular cavity spray unit.

9. The waste gas treatment device for a recycled plastic hot melt workshop according to claim 1, characterized in that: The main processing unit is also provided with a photocatalyst plate at the rear of the structural cavity.

10. The waste gas treatment device for a recycled plastic hot melt workshop according to claim 1, characterized in that: The tubular cavity spray unit is an inclined structure in a closed box, and a liquid accumulation tank is reserved on the inclined bottom side of the closed box. The liquid accumulation tank is externally connected to a spray liquid recovery pipeline, and the spray wastewater generated during the exhaust gas treatment process is collected through the spray liquid recovery pipeline.

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