Plastic bottle cap production waste gas treatment device

Abstract

The utility model discloses a waste gas treatment device for plastic bottle cap production. The waste gas treatment device comprises a horizontal spraying absorption tower, a gas-liquid separator, a primary adsorber, a secondary adsorber, a centrifugal fan and a discharge pipe, the horizontal spraying absorption tower, the gas-liquid separator, the first-stage adsorber, the second-stage adsorber, the centrifugal fan and the discharge pipe are sequentially communicated through a connecting pipe; according to the utility model, the horizontal spraying absorption tower is used for removing part of paint mist, paint mist waste gas generated in the production process of plastic bottle caps enters the tower body, is in contact with the packing layer in the tower and then reaches the demisting section, so that part of paint mist and water vapor in the waste gas are removed; the waste gas reaches a gas-liquid separator, and the waste gas in the waste gas is subjected to gas-liquid separation; finally, adsorbing volatile organic compounds in the waste gas by utilizing the adsorbability of the activated carbon; water in air is separated through the gas-liquid separator, and the situation that a large amount of water vapor enters the first-stage adsorber and the second-stage adsorber, the service life of activated carbon is shortened, and activated carbon saturation is likely to be caused is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of waste gas treatment, in particular to a waste gas treatment device for plastic bottle cap production. Background Technique

[0002] The production process of bottle caps includes processes such as preparing materials, injection molding, spraying, and printing. A large amount of VOCs is generated during the injection molding process, and a large amount of paint mist waste gas is generated during the spraying and printing processes. These gases are released into the atmosphere and participate in atmospheric chemical reactions, which may exacerbate the formation of photochemical smog and affect air quality. Therefore, they need to be treated before being discharged into the atmosphere. The paint mist waste gas contains a large amount of moisture. Currently, for the devices for treating paint mist waste gas, the main methods are absorption towers and activated carbon adsorption treatment. The waste gas contains a large amount of water vapor, which shortens the service life of the activated carbon. The activated carbon quickly becomes saturated, and then the waste gas quickly exceeds the standard. The treatment efficiency is low and the effect is not obvious, which is not conducive to economic and environmental benefits. Content of the Utility Model

[0003] To solve the defects of the existing technology for the devices for treating paint mist waste gas, mainly using absorption towers and activated carbon adsorption treatment, the waste gas contains water vapor, which shortens the service life of the activated carbon, the activated carbon quickly becomes saturated, and then the waste gas quickly exceeds the standard. The treatment efficiency is low and the effect is not obvious, which is not conducive to economic and environmental benefits. The utility model provides a waste gas treatment device for plastic bottle cap production.

[0004] To solve the above technical problems, the utility model provides the following technical solutions:

[0005] A waste gas treatment device for plastic bottle cap production of the utility model includes a horizontal spray absorption tower, a gas-liquid separator, a primary adsorber, a secondary adsorber, a centrifugal fan, and a discharge pipe; the horizontal spray absorption tower, the gas-liquid separator, the primary adsorber, the secondary adsorber, the centrifugal fan, and the discharge pipe are sequentially connected through connecting pipes;

[0006] The horizontal spray absorption tower is sequentially provided with spray nozzles, a spray absorption packing layer, and a demisting packing layer from the air inlet end to the air outlet end; it also includes a container tank for collecting the spray solution, and the container tank is connected to the bottom of the horizontal spray absorption tower, and the container tank is connected to the spray nozzles through a circulating pump circuit.

[0007] As a preferred technical solution of the utility model, a multi-layer honeycomb activated carbon adsorption layer is laid in the primary adsorber.

[0008] As a preferred technical solution of the utility model, a drying box is installed between the gas-liquid separator and the primary adsorber.

[0009] As a preferred technical solution of the present utility model, the drying box includes a drying housing, and a plurality of drying mesh columns distributed in an array are arranged inside the drying housing. Granular desiccants are filled in the drying mesh columns, and connecting pipes are arranged at both ends of the drying housing.

[0010] As a preferred technical solution of the present utility model, a humidity sensor is arranged at the air outlet end of the drying housing.

[0011] As a preferred technical solution of the present utility model, a first gas sensor is arranged at the air outlet end of the primary adsorber, a second gas sensor is arranged at the air outlet end of the primary adsorber, and a third gas sensor is arranged at the air outlet end of the secondary adsorber.

[0012] The beneficial effects of the present utility model are as follows:

[0013] 1. The waste gas treatment device for plastic bottle cap production uses a horizontal spray absorption tower to remove part of the paint mist. After the paint mist waste gas generated in the bottle cap production process enters the tower body, it contacts the packing layer in the tower and then reaches the demisting section, where part of the paint mist and water vapor in the waste gas are removed; the waste gas reaches the gas-liquid separator, and the waste gas in the waste gas is separated from the gas and liquid; finally, the adsorption property of activated carbon is used to adsorb the volatile organic compounds in the waste gas. The waste gas enters the primary adsorber, passes through the honeycomb activated carbon layer, and then reaches the secondary adsorber, passing through the granular activated carbon layer, greatly reducing the concentration of VOCS gas and achieving the up-to-standard discharge of waste gas; among them, the moisture in the air is separated through the gas-liquid separator to avoid a large amount of water vapor entering the primary adsorber and the secondary adsorber, reducing the service life of the activated carbon and easily causing the activated carbon to become saturated.

[0014] 2. A drying box is installed between the gas-liquid separator and the primary adsorber in the waste gas treatment device for plastic bottle cap production. A plurality of drying mesh columns distributed in an array are arranged inside the drying housing, and granular desiccants are filled in the drying mesh columns for physical adsorption drying, thus ensuring that the other substances entering the primary adsorber and the secondary adsorber have a higher dryness. Description of the Drawings

[0015] The drawings are used to provide a further understanding of the present utility model and constitute a part of the specification. They are used together with the embodiments of the present utility model to explain the present utility model and do not constitute a limitation to the present utility model. In the drawings:

[0016] Figure 1 is a schematic structural diagram of a waste gas treatment device for plastic bottle cap production of the present utility model;

[0017] Figure 2 is a schematic structural diagram of the drying box of a waste gas treatment device for plastic bottle cap production of the present utility model.

[0018] In the figure: 1. Horizontal spray absorption tower; 2. Gas-liquid separator; 3. Primary adsorber; 4. Secondary adsorber; 5. Centrifugal fan; 6. Discharge pipe; 7. Spray nozzle; 8. Spray absorption packing layer; 9. Demisting packing layer; 10. Container tank; 11. Circulation pump circuit; 12. Drying oven; 13. Drying housing; 14. Drying mesh column; 15. Connecting pipe; 16. Humidity sensor; 17. First gas sensor; 18. Second gas sensor; 19. Third gas sensor. Detailed implementation manners

[0019] The preferred embodiments of the present utility model will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are only for the purpose of illustration and explanation of the present utility model, and are not intended to limit the present utility model.

[0020] Embodiment: As Figure 1 and Figure 2 shown, a waste gas treatment device for plastic bottle caps production of the present utility model includes a horizontal spray absorption tower 1, a gas-liquid separator 2, a primary adsorber 3, a secondary adsorber 4, a centrifugal fan 5 and a discharge pipe 6; the horizontal spray absorption tower 1, the gas-liquid separator 2, the primary adsorber 3, the secondary adsorber 4, the centrifugal fan 5 and the discharge pipe 6 are sequentially connected through a connecting pipe; a coarse filter, a medium filter and a high-efficiency filter are provided in the gas-liquid separator 2. The sampling port of the discharge pipe adopts the standard of 6 in the front and 3 in the back.

[0021] The horizontal spray absorption tower 1 is sequentially provided with a spray nozzle 7, a spray absorption packing layer 8 and a demisting packing layer 9 from the air inlet end to the air outlet end; the width of the spray absorption packing layer is 600 - 800 mm, and the width of the demisting packing layer is 600 - 800 mm.

[0022] It further includes a container tank 10 for collecting the spray solution, and the container tank 10 is connected to the bottom of the horizontal spray absorption tower 1, and the container tank 10 is connected to the spray nozzle 7 through a circulation pump circuit 11. The horizontal spray absorption tower 1 is used to remove part of the paint mist. After the paint mist waste gas generated in the production process of the bottle cap enters the tower body, it contacts the packing layer in the tower and then reaches the demisting section, and part of the paint mist and water vapor in the waste gas are removed; the waste gas reaches the gas-liquid separator 2, and after passing through the filter, the waste gas in the waste gas is separated into gas and liquid; finally, the adsorption property of activated carbon is used to adsorb the volatile organic compounds in the waste gas. The waste gas enters the primary adsorber 3, passes through the honeycomb activated carbon layer and then reaches the secondary adsorber 4, passes through the granular activated carbon layer, so that the concentration of VOCS gas is greatly reduced, and the waste gas is discharged up to the standard; wherein the water in the air is separated by the gas-liquid separator 2 to avoid a large amount of water vapor entering the primary adsorber 3 and the secondary adsorber 4, which reduces the service life of the activated carbon and easily causes the activated carbon to be saturated.

[0023] Among them, a multi-layer honeycomb activated carbon adsorption layer is laid in the primary adsorber 3. The honeycomb activated carbon in the honeycomb activated carbon layer has a pore diameter of 2-4 mm, an iodine adsorption value of 400-800 mg / g, and a specific surface area of 600-900 m2 / g. The honeycomb activated carbon has the advantages of high adsorption efficiency and reusability.

[0024] Among them, a drying box 12 is installed between the gas-liquid separator 2 and the primary adsorber 3. The secondary adsorber 4 is filled with granular activated carbon. The granular activated carbon is selected as coal-based granular activated carbon, whose iodine adsorption value is ≥900 mg / g. The coal-based granular activated carbon has the advantages of developed pore structure, large specific area, strong adsorption capacity, high mechanical strength, small bed resistance, good chemical stability, easy regeneration, and durability.

[0025] Among them, the drying box includes a drying housing 13. A plurality of drying mesh columns 14 are arranged in an array inside the drying housing 13. The drying mesh columns 14 are filled with granular desiccants. Connecting pipes 15 are provided at both ends of the drying housing. A drying box 12 is installed between the gas-liquid separator 2 and the primary adsorber 3. Among them, a plurality of drying mesh columns 14 are arranged in an array inside the drying housing 13. The drying mesh columns 14 are filled with granular desiccants for physical adsorption drying, so as to ensure that the other substances entering the primary adsorber and the secondary adsorber 4 have a high degree of dryness.

[0026] Among them, a humidity sensor 16 is provided at the air outlet end of the drying housing 13, so that the humidity of the gas after the drying box can be checked, which is convenient for detecting the use state of the desiccant and timely replacing the desiccant.

[0027] Among them, a first gas sensor 17 is provided at the air outlet end of the primary adsorber 3, and a second gas sensor 18 is provided at the air outlet end of the primary adsorber 3. A third gas sensor 19 is provided at the air outlet end of the secondary adsorber 4. By detecting the concentration of the adsorbed gas before and after, it is convenient to detect the saturation state of the activated carbon adsorption layer and timely replace the activated carbon adsorption layer.

[0028] During operation, this plastic bottle cap production waste gas treatment device uses a horizontal spray absorption tower 1 to remove some paint mist. After the paint mist waste gas generated during the bottle cap production process enters the tower body, it contacts the packing layer in the tower and then reaches the demisting section, where part of the paint mist and water vapor in the waste gas are removed. The waste gas reaches the gas-liquid separator 2, and after passing through the filter, the waste gas in the waste gas undergoes gas-liquid separation. Finally, the adsorbability of activated carbon is used to adsorb the volatile organic compounds in the waste gas. The waste gas enters the primary adsorber 3, passes through the honeycomb activated carbon layer, and then reaches the secondary adsorber 4, passing through the granular activated carbon layer, greatly reducing the concentration of VOCS gas and achieving the up-to-standard discharge of the waste gas. Among them, the gas-liquid separator 2 is used to separate the moisture in the air to prevent a large amount of water vapor from entering the primary adsorber 3 and the secondary adsorber 4, which would reduce the service life of the activated carbon and easily cause the activated carbon to become saturated. The primary adsorber 3 and the secondary adsorber 4 can effectively remove VOCs in the waste gas. Most relatively large organic molecule, aromatic compounds, etc. can be firmly adsorbed on the surface or in the pores of the activated carbon, and have obvious removal effects on humus, synthetic organic matter, and low molecular weight organic matter.

[0029] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A waste gas treatment device for plastic bottle cap production, characterized in that: It comprises a horizontal spray absorption tower (1), a gas-liquid separator (2), a primary adsorber (3), a secondary adsorber (4), a centrifugal fan (5) and a discharge pipe (6); the horizontal spray absorption tower (1), the gas-liquid separator (2), the primary adsorber (3), the secondary adsorber (4), the centrifugal fan (5) and the discharge pipe (6) are connected in sequence via a connecting pipe; The horizontal spray absorption tower (1) is provided with a spray nozzle (7), a spray absorption packing layer (8) and a demisting packing layer (9) in sequence from the air inlet end to the air outlet end; and further comprises a container tank (10) for collecting the spray solution, wherein the container tank (10) is connected to the bottom of the horizontal spray absorption tower (1), and the container tank (10) is connected to the spray nozzle (7) via a circulation pump circuit (11).

2. A waste gas treatment device for plastic bottle cap production according to claim 1, characterized in that: The first-stage adsorber (3) is provided with multiple layers of honeycomb-shaped activated carbon adsorption layers.

3. A waste gas treatment device for plastic bottle cap production according to claim 2, characterized in that: A drying box (12) is installed between the gas-liquid separator (2) and the primary adsorber (3).

4. A waste gas treatment device for plastic bottle cap production according to claim 3, characterized in that: The drying box comprises a drying shell (13), a plurality of drying net columns (14) distributed in an array are arranged inside the drying shell (13), granular desiccant is filled in the drying net columns (14), and connecting pipes (15) are arranged at both ends of the drying shell.

5. A waste gas treatment device for plastic bottle cap production according to claim 4, characterized in that: A humidity sensor (16) is provided at the air outlet end of the drying housing (13).

6. The waste gas treatment device for plastic bottle cap production according to claim 1, characterized in that: The gas outlet end of the first-stage adsorber (3) is provided with a first gas sensor (17), the gas outlet end of the first-stage adsorber (3) is provided with a second gas sensor (18), and the gas outlet end of the second-stage adsorber (4) is provided with a third gas sensor (19).

Images