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How to treat the waste gas of paint

Views: 3     Author: Leander     Publish Time: 2020-10-30      Origin: Shenzhen XIcheng Environmental Technology CO.,LTD.

Wet Scrubber

    The paint spraying waste gas treatment process is divided into a pre-treatment stage and a post-treatment stage. In the pre-treatment stage, a pretreatment device is used to filter paint mist particles. The filtering equipment can be a wet scrubber or a dry filter.

    The post-treatment stage is mainly for the treatment of organic waste gas. According to the discharge amount of waste gas, suitable waste gas treatment equipment activated carbon adsorption box waste gas treatment device or a combined process combining the two processes can be selected.

    The paint spray booth waste gas treatment process, the paint spray booth waste gas treatment equipment needs to be treated in two directions.

1. Liquid paint mist;

2. Gaseous VOC; liquid paint mist contains particulate matter and is sticky. If the paint mist is not resolved, the subsequent VOC treatment equipment will easily be blocked.pp喷淋塔

pp spray tower

    Our company's paint spray booth waste gas treatment process is: spray paint waste gas → pp spray tower paint mist purification activated carbon adsorption box → fan → 15-meter chimney discharges up to standard. After the paint mist purification treatment in the pp spray tower, the paint loses its viscosity and solves the paint mist particles, thereby solving the liquid paint mist. What is left is only the gaseous VOC, which creates a good environment for the subsequent VOC treatment.

                                            The principle of paint mist-exhaust gas separation

    Traditional water curtain paint mist removal treatment methods cannot fundamentally solve the problem of paint mist. Whether the paint mist can be effectively separated from the exhaust gas is the key to the success of the project.

    Painting line paint mist exhaust gas pretreatment and purification device, pp spray tower, paint mist is suspended in the exhaust gas, when it passes through the pp spray tower (the flow rate of the exhaust gas in the pipeline is about 8.2m/s ), under the action of high-speed spray water, the rotating nozzle (the rotating speed of the nozzle depends on the amount of water and the pressure head), the umbrella-shaped rotating water curtain produced by the hydraulic force is fully mixed with the paint mist, so that the original The paint mist suspended in the gas collides with each other and rapidly gains weight, and finally achieves the purpose of paint mist-exhaust gas separation, and can reduce the VOC concentration by 50-80% and greatly reduce odor. Paint slag that loses its viscosity enters the circulating water of the spray booth, and the solid waste is regularly salvaged.

                                               Activated carbon adsorption box equipment

    At present, there are many domestic organic waste gas purification methods, such as direct combustion, catalytic combustion, regenerative combustion (RTO, RCO), etc., but for low concentration, large air volume exhaust gas is difficult to completely burn, and the waste heat cannot be fully utilized in intermittent operations. Activated carbon adsorption method is used for waste gas generated by low concentration, large air volume or intermittent operation, which has its unique advantages compared with other treatment methods.

                                                        Activated carbon adsorption box

    Activated carbon adsorption device is a high-efficiency, economical and practical organic waste gas purification device. It has the advantages of high adsorption efficiency, wide application area, convenient maintenance, and can treat multiple mixed waste gas at the same time. It is suitable for benzene, alcohol, ketone, ester, and gasoline. The exhaust gas of organic solvents has a good adsorption effect. The high-quality granular activated carbon selected for this project has many micropores and a large specific surface area. Relying on molecular gravity and capillary action, it can adsorb exhaust gas and volatile organic substances on its surface.

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