Purification system applied to heating wire cutting waste gas of plastic plate

Abstract

The utility model relates to a purification system applied to plastic plate electric heating wire cutting waste gas, which comprises an electrostatic oil smoke purification device, a spray washing tower, a dry filter and an activated carbon adsorption device which are sequentially connected along the air flowing direction, the electrostatic lampblack purification device comprises a first purification area and a second purification area which are sequentially arranged in the air flowing direction, and the electric field intensity of the second purification area is larger than that of the first purification area. The system can effectively remove pollutants in the plastic plate electric heating wire cutting waste gas, and can prevent the pipeline from being blocked.

Description

Technical Field

[0001] The utility model relates to the field of atmospheric environmental protection management, and in particular to a purification system for waste gas from electric heating wire cutting of plastic plates. Background Art

[0002] During the production process of plastic boards, about 95% of the honeycomb blocks need to be hot-melt cut by electric heating wires after the plastic boards are bonded. The cutting temperature is around 200°C. This process will produce smoke and a small amount of non-methane total hydrocarbons.

[0003] After high-temperature cutting, some solid plastics are vaporized into gaseous substances. As the waste gas cools down in the discharge or treatment pipeline, it gradually becomes solid again. In the actual production process, it is easy to accumulate and block the pipeline, and the pipeline is difficult to clean. At the same time, the non-methane total hydrocarbons and other VOCs produced will seriously pollute the ecological environment if not treated. Therefore, there is an urgent need for a purification system for waste gas from electric heating wire cutting of plastic plates. Utility Model Content

[0004] In view of the deficiencies in the prior art, the purpose of the utility model is to provide a purification system for waste gas from electric heating wire cutting of plastic plates, which can effectively remove pollutants in the waste gas from electric heating wire cutting of plastic plates and avoid pipeline blockage.

[0005] To achieve the purpose of the utility model, the utility model provides a purification system for waste gas from electric heating wire cutting of plastic plates, including an electrostatic fume purification device, a spray washing tower, a dry filter and an activated carbon adsorption device connected in sequence along the air flow direction, the electrostatic fume purification device including a first purification zone and a second purification zone arranged in sequence along the air flow direction, the electric field strength of the second purification zone being greater than the electric field strength of the first purification zone.

[0006] In some embodiments of the present invention, the electrostatic oil fume purification device includes a honeycomb electrode disposed in the first purification area and a first electrode matched with the honeycomb electrode.

[0007] In some embodiments of the present invention, the electrostatic oil fume purification device includes a plate electrode disposed in the second purification zone and a second electrode matched with the plate electrode.

[0008] In some embodiments of the present invention, the distance between the plate electrode and the second electrode is smaller than the distance between the honeycomb electrode and the first electrode.

[0009] In some embodiments of the present invention, the voltage difference between the plate electrode and the second electrode is not less than the voltage difference between the honeycomb electrode and the first electrode.

[0010] In some embodiments of the present invention, the plate electrode and the honeycomb electrode are connected to a first pole of a power source, and the second electrode and the first electrode are connected to a second pole of the power source.

[0011] In some embodiments of the present invention, the first electrode is a needle electrode, and the needle electrode is inserted into the honeycomb structure of the honeycomb electrode.

[0012] In some embodiments of the present invention, the second electrode is a sawtooth electrode, and the direction of the tooth tip of the sawtooth electrode is parallel to the plate electrode or perpendicular to the plate electrode.

[0013] In some embodiments of the utility model, the electrostatic oil fume purification device includes a shell, the shell has an air inlet and an air outlet, the first purification zone and the second purification zone are located in the shell and are arranged in sequence along the direction from the air inlet to the air outlet; fire dampers are respectively provided on the air inlet and the air outlet.

[0014] In some embodiments of the present invention, the activated carbon adsorption device includes a primary activated carbon adsorber and a secondary activated carbon adsorber which are sequentially arranged along the air flow direction.

[0015] In some embodiments of the present invention, the system further comprises a system fan and an exhaust chimney, and the system fan and the exhaust chimney are sequentially arranged downstream of the activated carbon adsorption device.

[0016] Compared with the prior art, the utility model can achieve the following beneficial effects:

[0017] The purification system provided by the utility model includes an electrostatic oil fume purification device, a spray scrubber, a dry filter and an activated carbon adsorption device, wherein the electrostatic oil fume purification device includes two purification areas with different electric fields, which are respectively used to remove large particles and fine oil mist particles or gaseous volatiles in the exhaust gas, so as to prevent the gaseous volatiles from clogging subsequent equipment and pipelines after solidification when cold; the spray scrubber is used to reduce the exhaust gas temperature and remove water-soluble pollutants; the dry filter is used to further remove particles and prevent clogging of activated carbon; the activated carbon adsorption device removes harmful substances such as non-methane total hydrocarbons. The utility model adopts the above-mentioned settings, which can effectively remove pollutants in the exhaust gas of the electric heating wire cutting of plastic plates, thereby meeting the emission standards. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of an embodiment of the purification system of the utility model.

[0019] Figure 2 It is a schematic structural diagram of the electrostatic oil fume purification device in the first purification zone in an embodiment of the purification system of the utility model.

[0020] Figure 3 It is a schematic structural diagram of the electrostatic oil fume purification device in the second purification zone in an embodiment of the purification system of the utility model.

[0021] The present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. DETAILED DESCRIPTION

[0022] like Figures 1 to 3 As shown, this embodiment provides a purification system that can effectively remove vaporized plastics, smoke and non-methane total hydrocarbons, avoid clogging of waste gas treatment pipelines, and is particularly suitable for treating waste gas from electric heating wire cutting of plastic plates. Of course, the purification system of this embodiment can also be used for the treatment of other industrial waste gases.

[0023] Specifically, the purification system includes an electrostatic fume purification device 10, a spray scrubber 20, a dry filter 30 and an activated carbon adsorption device 40 connected in sequence along the air flow direction. The electrostatic fume purification device 10 includes a first purification zone 11 and a second purification zone 12 arranged in sequence along the air flow direction. The electric field strength of the second purification zone 12 is greater than the electric field strength of the first purification zone 11, so as to purify different particulate matter and vaporized matter. The first purification zone 11 and the second purification zone 12 of the electrostatic fume purification device 10 are respectively used to remove large particulate matter and fine oil mist particles or gaseous volatiles in the exhaust gas, so as to avoid the gaseous volatiles from clogging subsequent equipment and pipelines after solidification when cold; the spray scrubber 20 is used to reduce the exhaust gas temperature and remove water-soluble pollutants; the dry filter 30 is used to further remove particulate matter to prevent clogging of activated carbon; the activated carbon adsorption device 40 removes harmful substances such as non-methane total hydrocarbons. The utility model adopts the above-mentioned settings, which can effectively remove pollutants in the exhaust gas of the electric heating wire cutting of the plastic plate, thereby meeting the emission standards.

[0024] When the purification system of this embodiment is working, the exhaust gas first enters the electrostatic oil fume purification device 10. The first purification zone 11 of the electrostatic oil fume purification device 10 is a high-efficiency purification zone, and the second purification zone 12 is a deep purification zone. First, the larger particles are removed through the first purification zone 11, and then the fine oil mist particles or gaseous volatiles are removed through the second purification zone 12. Then, the exhaust gas temperature is further reduced to below 40°C through the spray scrubber 20, and some water-soluble particles can be removed at the same time. Then, the dry filter 30 is used to further remove the particles to prevent the activated carbon behind from clogging; finally, the activated carbon adsorption device 40 is used to remove harmful substances such as non-methane total hydrocarbons to achieve standard emissions. Among them, the electrostatic oil fume purification device 10 is close to the product point, which can prevent the gaseous volatiles from accumulating on the pipeline and clogging the pipeline after solidification when cold.

[0025] In some examples, the electrostatic oil fume purification device 10 includes a honeycomb electrode 13 arranged in the first purification area 11 and a first electrode 14 matched with the honeycomb electrode 13. The honeycomb electrode 13 and the first electrode 14 form a honeycomb electric field. The honeycomb electric field has advantages such as uniform electric field and can effectively purify large particles of matter.

[0026] In some examples, the electrostatic oil fume purification device 10 includes a plate electrode 15 arranged in the second purification area 12 and a second electrode 16 matched with the plate electrode 15. The plate electrode 15 and the second electrode 16 can form a plate-type electric field. The plate-type electric field has the advantages of strong electrostatic adsorption ability and can deeply purify oil mist particles or gaseous volatiles.

[0027] In some examples, the distance between the plate electrode 15 and the second electrode 16 is smaller than the distance between the honeycomb electrode 13 and the first electrode 14 , and a narrow-pole-gap plate-type electric field is formed between the plate electrode 15 and the second electrode 16 , which helps to further improve the purification effect.

[0028] In some examples, the voltage difference between the plate electrode 15 and the second electrode 16 is not less than the voltage difference between the honeycomb electrode 13 and the first electrode 14, so that a stronger electric field is easily formed between the plate electrode 15 and the second electrode 16, thereby improving the deep purification effect.

[0029] In some examples, the plate electrode 15 and the honeycomb electrode 13 are connected to the first pole of the power supply, and the second electrode 16 and the first electrode 14 are connected to the second pole of the power supply, so that the voltage difference between the plate electrode 15 and the second electrode 16 is equal to the voltage difference between the honeycomb electrode 13 and the first electrode 14, making the power supply design simpler, reducing the need for power supply transformation, and saving costs.

[0030] In some examples, the first electrode 14 is a needle electrode, and there may be multiple needle electrodes, and multiple needle electrodes may be connected to the electrode frame. The honeycomb electrode 13 may have multiple honeycomb structures, and the honeycomb structure forms a hexagonal ventilation channel. The needle electrode cooperates with the honeycomb structure of the honeycomb electrode 13, for example, one-to-one, to form an electric field between each honeycomb structure and the needle electrode. In some examples, the needle electrode is inserted into the honeycomb structure, so that the electric field in the honeycomb structure is more uniform and more conducive to the discharge of the needle electrode. In other examples, the needle electrode may also be located upstream or downstream of the honeycomb structure.

[0031] In some examples, the second electrode 16 is a sawtooth electrode, and the tooth tip of the sawtooth electrode can discharge better, so that the particles are charged. The direction of the tooth tip of the sawtooth electrode can be parallel to the plate electrode 15, thereby reducing the obstruction of the sawtooth to the airflow. In other examples, the direction of the tooth tip of the sawtooth electrode can also be perpendicular to the plate electrode 15.

[0032] In some examples, a pair of sawtooth electrodes may be provided in the width direction of the plate electrode 15 to improve the uniformity of the electric field. The width direction of the plate electrode 15 is the same as the flow direction of the airflow.

[0033] In some examples, the electrostatic oil fume purification device 10 includes a shell 17, the shell 17 has an air inlet and an air outlet, the first purification zone 11 and the second purification zone 12 are located in the shell 17 and are arranged in sequence from the air inlet to the air outlet, and fire dampers 18 are respectively provided on the air inlet and the air outlet. The fire dampers 18 are closed when flames or high temperatures are detected, thereby isolating the electrostatic oil fume purification device 10 from the air to prevent fire caused by high temperature of the electrostatic oil fume purification device 10.

[0034] In some examples, the activated carbon adsorption device 40 includes a primary activated carbon adsorber 41 and a secondary activated carbon adsorber 42 which are sequentially arranged along the air flow direction. The two-stage activated carbon adsorption can better remove harmful substances such as non-methane total hydrocarbons.

[0035] In some examples, the purification system also includes a system fan 50 and an exhaust chimney 60, which are sequentially arranged downstream of the activated carbon adsorption device 40. The system fan 50 is used to provide power for gas flow, and the system fan 50 is arranged downstream of the exhaust gas treatment to avoid pollutants from contaminating the fan. The exhaust chimney 60 is used to discharge the purified exhaust gas upward to avoid disturbing the ground air.

[0036] Finally, it should be emphasized that the above is only a preferred embodiment of the utility model and is not intended to limit the utility model. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A purification system for waste gas from electric heating wire cutting of plastic plates, characterized in that It comprises an electrostatic oil fume purification device, a spray scrubber, a dry filter and an activated carbon adsorption device which are sequentially connected along the air flow direction, wherein the electrostatic oil fume purification device comprises a first purification zone and a second purification zone which are sequentially arranged along the air flow direction, and the electric field strength of the second purification zone is greater than the electric field strength of the first purification zone; The electrostatic oil fume purification device comprises a honeycomb electrode arranged in the first purification area and a first electrode matched with the honeycomb electrode; the electrostatic oil fume purification device comprises a plate electrode arranged in the second purification area and a second electrode matched with the plate electrode; The distance between the plate electrode and the second electrode is smaller than the distance between the honeycomb electrode and the first electrode; The voltage difference between the plate electrode and the second electrode is not less than the voltage difference between the honeycomb electrode and the first electrode; The plate electrode and the honeycomb electrode are connected to a first pole of a power source, and the second electrode and the first electrode are connected to a second pole of a power source; The first electrode is a needle electrode, and the needle electrode is inserted into the honeycomb structure of the honeycomb electrode; The second electrode is a sawtooth electrode, and the direction of the tooth tip of the sawtooth electrode is parallel to the plate electrode or perpendicular to the plate electrode.

2. The purification system for waste gas from electric heating wire cutting of plastic plates according to claim 1 is characterized in that The electrostatic oil fume purification device includes a shell having an air inlet and an air outlet. The first purification zone and the second purification zone are located in the shell and are arranged in sequence along the direction from the air inlet to the air outlet. Fire dampers are respectively provided on the air inlet and the air outlet.

3. A purification system for waste gas from electric heating wire cutting of plastic plates according to claim 1 or 2, characterized in that The activated carbon adsorption device comprises a primary activated carbon adsorber and a secondary activated carbon adsorber which are sequentially arranged along the air flow direction.

4. A purification system for waste gas from electric heating wire cutting of plastic plates according to claim 1 or 2, characterized in that It also includes a system fan and an exhaust pipe, which are sequentially arranged downstream of the activated carbon adsorption device.

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