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Painting exhaust gas treatment process flow
Views: 359 Author: Site Editor Publish Time: 2025-09-07 Origin: Site
The "three wastes" (waste gas, waste water, solid waste) emissions and energy consumption of traditional coating processes are relatively high. In today’s era where great emphasis is placed on ecological and environmental protection, Shisheng Group actively responds to the national call for building an environment-friendly and low-carbon economy. It has invested heavily and pursued independent innovation in addressing the key issues of reducing "three wastes" emissions and energy consumption from coating production lines.
In terms of coating waste gas treatment, the company has successfully developed an activated carbon adsorption-desorption treatment system, a direct-fired waste gas incinerator, and a zeolite rotor + RTO (Regenerative Thermal Oxidizer) incineration system. Owing to their high level of independent innovation, these technologies have successfully passed expert appraisal. Currently, the company has a number of successful cases involving waste gas treatment equipment. Relying on technological progress and the perseverance of professional personnel, it is contributing to the realization of green coating through innovation.
Key Steps in the Coating Waste Gas Treatment Process
Waste Gas Collection During the coating process, waste gas is mainly generated in spray booths, drying rooms, etc. This waste gas usually contains components such as organic solvents and paint mist.
Waste Gas Pre-treatment The pre-treatment stage includes reducing the temperature of the waste gas, removing moisture from it, and reducing particulate matter. This step helps to lower the difficulty and cost of subsequent treatment.
Waste Gas Treatment a. Zeolite Rotor Concentration + RTO/CO (Catalytic Oxidizer): Suitable for low-concentration, large-airflow, normal-temperature waste gas generated in spray booths and drying rooms. The zeolite rotor can concentrate large-airflow, low-concentration waste gas into small-airflow, high-concentration waste gas, thereby reducing the investment cost and operating cost of subsequent RTO/CO devices. b. Water Spray Waste Gas Treatment Tower: After being cleaned by a water curtain cabinet, the spray waste gas enters the water spray waste gas treatment tower for further cleaning. Then, it is sent to an activated carbon adsorption tower via a pressure-induced draft fan. Organic gases are adsorbed by the activated carbon inside the tower, and the emitted low-concentration organic gases are adsorbed on the active surface of the activated carbon. The purified gas is discharged at height through an exhaust duct in compliance with relevant standards.
Comprehensive Utilization of Waste Heat The VOCs (Volatile Organic Compounds) heat generated during combustion can be recovered and used for pre-treatment heating, drying, or curing preheating. This reduces the heat demand for production or waste gas treatment and offsets part of the cost of waste gas treatment.
Solid Waste Treatment During the VOCs treatment process, collected solid wastes such as dust, paint mist, and replaced waste filter materials, catalysts, and heat storage bodies shall be treated in accordance with national regulations on solid waste treatment and disposal.
Through the above process flow, the waste gas generated during the coating process can be effectively treated, reducing its impact on the environment.
