A polyester powder coating waste gas treatment device based on a biofilter

Abstract

This utility model relates to a polyester powder coating waste gas treatment device based on a biofilter, including a dust collector and a biofilter connected by a pipeline. The dust collector includes a housing with a perforated plate dividing the housing into a clean air chamber and a dust chamber. The perforated plate has mounting holes and a filter cartridge is mounted on it. The filter cartridge is sealed and installed in the mounting holes through its upper opening, and its internal cavity communicates with the clean air chamber. The housing has an inlet connecting to the dust chamber and an outlet connecting to the clean air chamber. The biofilter includes a tank body with a filter assembly inside. The filter assembly includes a permeable plate with a filter bed. The filter assembly also includes an inlet and an outlet on the tank body, with the inlet located below the permeable plate and the outlet above the filter bed. This utility model can treat polyester powder coating waste gas.

Description

Technical Field

[0001] This utility model relates to a waste gas treatment device for polyester powder coatings based on a biofilter, and belongs to the field of waste gas treatment technology for polyester powder coatings. Background Technology

[0002] Polyester powder coating is a solid powder coating made from polyester resin as the main film-forming substance, combined with curing agents, pigments, fillers, and additives, through processes such as melt extrusion, cooling, sheeting, crushing, and sieving. The production of polyester powder coating generates waste gas, the main components of which are VOCs and dust. VOCs are also called organic waste gas. These waste gases not only harm human health and pollute the environment but also affect production safety, necessitating treatment. Current technologies for treating waste gas from polyester powder coating typically involve first using a dust collector to remove dust, and then passing the dust-removed waste gas into an activated carbon adsorption device to adsorb the VOCs.

[0003] However, once the activated carbon adsorption device becomes saturated with VOCs, the activated carbon needs to be replaced regularly, otherwise it will cause secondary pollution. Furthermore, activated carbon has a very weak adsorption capacity for small molecular weight and low boiling point substances in VOCs, so the activated carbon adsorption device has a limited adsorption effect on VOCs in polyester powder coating exhaust gas. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a polyester powder coating waste gas treatment device based on a biological filter, which solves the problem that the activated carbon adsorption device has limited adsorption effect on VOCs in the waste gas when using dust removal and activated carbon adsorption to treat polyester powder coating waste gas.

[0005] To solve the above problems, the polyester powder coating exhaust gas treatment device based on a biofilter involved in this utility model adopts the following technical solution: A waste gas treatment device for polyester powder coatings based on a biofilter includes a base, on which a dust collector and a biofilter are mounted, connected by a pipeline. The dust collector includes a housing with a perforated plate dividing it into a clean air chamber and a dust chamber. The perforated plate has mounting holes, and filter cartridges are mounted on it, sealed within the mounting holes through their upper openings. The internal cavity of each filter cartridge communicates with the clean air chamber. An inlet on the housing connects to both the dust chamber and the clean air chamber. The air outlet of the chamber; a dust removal device is provided above the filter cartridge in the clean air chamber; the biological filter includes a tank body, a filter assembly is provided in the tank body, the filter assembly includes an air permeable plate, a filter bed is provided on the air permeable plate, the filter assembly also includes an air inlet and an air outlet provided on the tank body, the air inlet is located below the air permeable plate, and the air outlet is located above the filter bed; a fan is provided on the box body, the air inlet of the fan is connected to the air outlet of the box body, and the air outlet of the fan is connected to the air inlet of the tank body through a pipe.

[0006] An air guide pipe is provided on the outside of the pool body, and the pipe is connected to the air inlet of the pool body through the air guide pipe.

[0007] Multiple filter components are evenly distributed from bottom to top in the pool body. Each filter component is provided with a flow divider plate below it. Each flow divider plate is located below each air inlet. The air guide pipe is provided with multiple air distribution ports, and each air distribution port is connected to each air inlet.

[0008] The dust removal component is an electromagnetic pulse valve, which is installed on the top wall of the housing.

[0009] A guide plate is provided in the dust chamber. The guide plate is located inside the air inlet and is used to guide the airflow entering the air inlet to the bottom space of the dust chamber.

[0010] The guide plate is an inclined plate.

[0011] The housing is equipped with a dust hopper at the lower end of the dust chamber. The dust hopper is a cone-shaped hopper that is larger at the top and smaller at the bottom.

[0012] The lower end of the ash hopper is provided with an ash collection drawer, which is slidably mounted on the ash hopper.

[0013] The dust collection drawer is equipped with a handle.

[0014] The base of this utility model is equipped with a dust collector and a biological filter. The biological filter includes a tank body, a filtration assembly inside the tank body, a permeable plate, and a filter bed on the permeable plate. The filtration assembly also includes an air inlet and an air outlet on the tank body. The air inlet is located below the permeable plate, and the air outlet is located above the filter bed. A fan is installed on the dust collector housing. The fan's suction port is connected to the housing's air outlet, and the fan's air outlet is connected to the air inlet of the biological filter housing via a pipe. When treating polyester powder coating waste gas, the dust collector and biological filter are combined. The fan draws the polyester powder coating waste gas into the dust collector through the air inlet on the dust collector housing. The dust collector filters out the dust in the waste gas. The dust-filtered waste gas is blown into the biological filter by the fan through the pipe. The waste gas then passes through the permeable plate and disperses into the filter bed. The microorganisms in the filter bed consume the VOCs in the waste gas, ultimately metabolizing them into carbon dioxide, water, and the microbial cells themselves. In this way, both dust and VOCs in the exhaust gas of polyester powder coating are removed. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the embodiments will be briefly described below: Figure 1 This is a three-dimensional structural diagram of an embodiment of the present utility model; Figure 2 for Figure 1 A three-dimensional structural diagram of a medium-sized dust collector; Figure 3 for Figure 2 The main view; Figure 4 for Figure 3 A schematic diagram of the AA cross-sectional structure; Figure 5 for Figure 1 A three-dimensional structural diagram of a biological filter bed; Figure 6 for Figure 5 The main view; Figure 7 for Figure 6 BB cross-sectional structure diagram Figure 8 for Figure 1 A three-dimensional structural diagram of the central airway; Figure 9 for Figure 1 A three-dimensional structural diagram of a medium-sized fan; Figure 10 for Figure 1 A schematic diagram of the axial cross-sectional structure of the middle box.

[0016] In the diagram: 1. Base; 2. Dust collector; 3. Biological filter; 4. Pipeline; 5. Box; 6. Tube plate; 7. Mounting hole; 8. Filter cartridge; 9. Air inlet; 10. Air outlet; 11. Tank body; 12. Breathable plate; 13. Filter bed; 14. Air inlet; 15. Exhaust outlet; 16. Fan; 17. Air intake; 18. Air outlet; 19. Air guide pipe; 20. Diverter plate; 21. Air distribution port; 22. Electromagnetic pulse valve; 23. Diverter plate; 24. Ash hopper; 25. Ash collection drawer; 26. Handle. Detailed Implementation

[0017] To make the technical objectives, technical solutions, and beneficial effects of this utility model clearer, the technical solution of this utility model will be further described below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model; that is, the described embodiments are only a part of the embodiments of this utility model, and not all of them. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0018] In this utility model, unless otherwise stated, the orientations used, such as "up" and "down", usually refer to the direction shown in the accompanying drawings, or to the vertical, perpendicular, or gravitational direction; similarly, for ease of understanding and description, "left" and "right" usually refer to the left and right shown in the accompanying drawings; "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not used to limit this utility model.

[0019] The specific embodiments of the polyester powder coating waste gas treatment device based on a biofilter involved in this utility model are as follows: Figures 1-10The system comprises a base 1 as its foundation, on which are mounted a dust collector 2 for removing dust from the exhaust gas of polyester powder coating and a biological filter 3 for removing VOCs from the exhaust gas. The dust collector 2 and the biological filter 3 are connected by a pipe 4. The dust collector 2 includes a housing 5, in which a tube sheet 6 is provided to divide the housing 5 into a clean air chamber and a dust chamber. The dust chamber is located at the lower part of the tube sheet 6 and is used to draw in the exhaust gas of polyester powder coating and provide space for the initial settling of dust in the exhaust gas. The clean air chamber is located above the tube sheet and is used to temporarily store the exhaust gas after dust removal. The tube sheet 6 has mounting holes 7, and a filter cartridge 8 is installed on the tube sheet 6. The filter cartridge 8 is sealed and installed in the mounting hole 7 through its upper opening. The internal cavity of the filter cartridge 8 communicates with the clean air chamber. The filter cartridge 8 is used to filter dust from the exhaust gas of polyester powder coating. The exhaust gas after dust removal enters the clean air chamber. The housing 5 has an air inlet 9 connecting to the dust chamber and an air outlet 10 connecting to the clean air chamber. A dust removal device is installed above the filter cartridge in the clean air chamber. The dust removal component is used to remove dust adhering to the filter cartridge 8, preventing the filter cartridge 8 from being clogged by dust and affecting its filtration function; the biological filter 3 includes a tank body 11, and a filter assembly is provided inside the tank body 11. The filter assembly includes a permeable plate 12, and a filter bed 13 is provided on the permeable plate 12. Microorganisms that decompose organic waste gas are attached to the filter bed 13, which are used to decompose VOCs in the waste gas of polyester powder coating. The filter assembly also includes an air inlet 14 and an exhaust outlet 15 provided on the tank body 11. The air inlet 14 is located at... Below the permeable plate 12, the exhaust port 15 is located above the filter bed 13. The exhaust gas, after being dedusted by the dust collector 2, enters the biological filter 3 through the inlet 14. The VOCs in this exhaust gas are decomposed into harmless gases by the microorganisms in the biological filter 3 and discharged from the exhaust port 15. A fan 16 is installed on the housing 5 of the dust collector 2. The suction port 17 of the fan 16 is connected to the outlet 10 of the housing 5, and the outlet 18 of the fan 16 is connected to the inlet 14 of the tank body 11 via a pipe 4. The fan 16 is used to draw the polyester powder coating exhaust gas into the dust collector 2 and blow the dedusted exhaust gas into the biological filter 3.

[0020] In operation, the blower 16 is first started, drawing the polyester powder coating exhaust gas into the dust chamber of the dust collector 2 through the inlet 9. After the dust is filtered out by the filter cartridge 8, the exhaust gas enters the clean air chamber and exits the dust collector 2 through the outlet 10. The filtered exhaust gas is then blown by the blower 16 through the pipe 4 to the biological filter 3, and enters the tank body 11 of the biological filter 3 through the inlet 14. The exhaust gas then passes through the permeable plate 12 and is evenly dispersed in the filter bed 13. The VOCs in the exhaust gas are decomposed by the microorganisms on the filter bed 13 and discharged from the exhaust port 15 above the filter bed 13 into the biological filter 3. Thus, both dust and VOCs in the polyester powder coating exhaust gas are removed.

[0021] Specifically, an air guide pipe 19 is provided on the outside of the pool body 11, and the pipe 4 is connected to the air inlet 14 of the pool body 11 through the air guide pipe 19.

[0022] Specifically, multiple filter components are evenly distributed from bottom to top within the tank body 11. Each filter component has a diversion plate 20 below it, and each diversion plate 20 is positioned below each air inlet 14. Multiple air distribution ports 21 are provided on the air guide pipe 19, each port 21 corresponding to and connected to each air inlet 14. This allows the filter components to be arranged in layers, and the exhaust gas is correspondingly divided into multiple streams by the air inlets 14 and the diversion plates 20, with each stream corresponding to a specific filter component. After entering the tank body 11 from the air inlet 14, the exhaust gas is diverted by the diversion plates 20 to each filter component. During this process, the VOCs in the exhaust gas are decomposed by microorganisms on the filter bed 13 of each filter component, and then discharged from the corresponding exhaust port 15 into the biological filter 3. The tank body 11 has an opening at the top, which serves as the exhaust port for the uppermost filter component. Multiple filtration components evenly disperse the waste gas entering the tank 11, allowing the waste gas to be evenly distributed into each filter bed 13, thereby accelerating the decomposition rate of VOCs in the waste gas.

[0023] Specifically, the dust removal component is an electromagnetic pulse valve 22, which is installed on the top wall of the housing 5. The electromagnetic pulse valve 22 can instantly inject compressed air into the filter cartridge 8, thereby blowing away the dust adhering to the filter cartridge 8 and preventing the filter cartridge 8 from being clogged by dust.

[0024] Specifically, a guide plate 23 is provided in the dust chamber. The guide plate 23 is located inside the air inlet 9 and is used to guide the airflow entering the air inlet 9 to the bottom space of the dust chamber. The guide plate 23 can change the airflow direction in the dust chamber, so that the airflow is evenly distributed on the cross-section of the dust collector 2, and reduce the impact of the airflow on the filter cartridge 8.

[0025] Specifically, the guide plate 23 is an inclined plate, which can change the direction of airflow, causing the airflow to diffuse obliquely towards the bottom of the dust chamber along the surface of the guide plate 23. This consumes the kinetic energy of the airflow and buffers it in the dust chamber, allowing the dust in the airflow to initially settle. Then, the airflow rises evenly and slowly and passes through each filter cartridge 8, achieving uniform filtration.

[0026] Specifically, a dust hopper 24 is provided at the lower end of the dust chamber on the housing 5. The dust hopper 24 is a conical hopper that is larger at the top and smaller at the bottom. The dust hopper 24 is used to collect and temporarily store dust.

[0027] Specifically, the lower end of the ash hopper 24 is provided with an ash collection drawer 25, which is slidably mounted on the ash hopper 24. The ash collection drawer 25 is used to collect and discharge dust from the ash hopper 24, and the discharged dust can be recycled and reused.

[0028] Specifically, the dust collection drawer 25 is equipped with a handle 26. The handle 26 provides the operator with a point of leverage, making it easy to push and pull the dust collection drawer 25.

[0029] In the above embodiments, an air guide pipe is provided on the outside of the pool body, and the pipe is connected to the air inlet of the pool body through the air guide pipe. In other embodiments, the air guide pipe may not be provided.

[0030] In the above embodiment, multiple filter components are evenly distributed from bottom to top in the pool body. Each filter component is provided with a flow divider plate below it. Each flow divider plate is correspondingly located below each air inlet. The air guide pipe is provided with multiple air distribution ports, and each air distribution port is connected to each air inlet. This is an optimized technical solution. In other embodiments, only one filter component may be provided in the pool body.

[0031] In the above embodiments, the cleaning component is an electromagnetic pulse valve, which is installed on the top wall of the housing. This is an optimized technical solution. In other embodiments, the electromagnetic pulse valve can be replaced by a cleaning brush that is rotatably installed on the surface of the filter cartridge.

[0032] In the above embodiments, a guide plate is provided in the dust chamber. The guide plate is located inside the air inlet and is used to guide the airflow entering the air inlet to the bottom space of the dust chamber. This is an optimized technical solution. In other embodiments, the guide plate may not be provided.

[0033] In the above embodiments, the guide plate is an inclined plate; in other embodiments, the guide plate may also be an arc-shaped plate.

Claims

1. A waste gas treatment device for polyester powder coatings based on a biological filter, characterized in that, Includes a base, on which a dust collector and a biological filter are mounted, and the dust collector and the biological filter are connected by a pipe; The dust collector includes a housing, in which a tube sheet is provided to divide the housing into a clean air chamber and a dust chamber. The tube sheet has mounting holes and a filter cartridge is provided on the tube sheet. The filter cartridge is sealed and installed in the mounting holes through its upper opening. The internal cavity of the filter cartridge is connected to the clean air chamber. The housing has an air inlet connecting to the dust chamber and an air outlet connecting to the clean air chamber. A dust removal component is provided above the filter cartridge in the clean air chamber. The biological filter includes a tank body, a filtration assembly is provided in the tank body, the filtration assembly includes an air permeable plate, a filter bed is provided on the air permeable plate, the filtration assembly also includes an air inlet and an air outlet provided on the tank body, the air inlet is located below the air permeable plate, and the air outlet is located above the filter bed. A fan is installed on the box body. The air intake of the fan is connected to the air outlet of the box body, and the air outlet of the fan is connected to the air inlet of the pool body through a pipe.

2. The polyester powder coating waste gas treatment device based on a biological filter according to claim 1, characterized in that, An air guide pipe is provided on the outside of the pool body, and the pipe is connected to the air inlet of the pool body through the air guide pipe.

3. The polyester powder coating waste gas treatment device based on a biological filter according to claim 2, characterized in that, Multiple filter components are evenly distributed from bottom to top in the pool body. Each filter component is provided with a flow divider plate below it. Each flow divider plate is located below each air inlet. The air guide pipe is provided with multiple air distribution ports, and each air distribution port is connected to each air inlet.

4. The polyester powder coating waste gas treatment device based on a biofilter according to claim 1 or 3, characterized in that, The dust removal component is an electromagnetic pulse valve, which is installed on the top wall of the housing.

5. The polyester powder coating waste gas treatment device based on a biofilter according to claim 4, characterized in that, A guide plate is provided in the dust chamber. The guide plate is located inside the air inlet and is used to guide the airflow entering the air inlet to the bottom space of the dust chamber.

6. The polyester powder coating waste gas treatment device based on a biological filter according to claim 5, characterized in that, The guide plate is an inclined plate.

7. The polyester powder coating waste gas treatment device based on a biological filter according to claim 6, characterized in that, The housing is equipped with a dust hopper at the lower end of the dust chamber. The dust hopper is a cone-shaped hopper that is larger at the top and smaller at the bottom.

8. The polyester powder coating waste gas treatment device based on a biological filter according to claim 7, characterized in that, The lower end of the ash hopper is provided with an ash collection drawer, which is slidably mounted on the ash hopper.

9. The polyester powder coating waste gas treatment device based on a biological filter according to claim 8, characterized in that, The dust collection drawer is equipped with a handle.

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