Baidu Encyclopedia: Paint Mist Purification

Overview: Currently, the coatings used in spraying are still mainly solvent-based. The organic solvents - benzene, toluene, and xylene (commonly referred to as "three benzenes") on the surface of the paint film and in the paint mist directly volatilize into the workshop air. At the same time, after the solvent evaporates, the tiny paint mist droplets form dust which also disperses in the workshop air. The three benzenes belong to highly toxic solvents. When released into the workshop air during operations, workers inhale them through their respiratory system, which can cause both acute and chronic poisoning. This primarily damages the central nervous system and hematopoietic system. Short-term inhalation of high concentrations (1500mg/m³) of benzene vapor can lead to aplastic anemia; frequent inhalation of low concentrations of benzene vapor can also cause nausea, vomiting, mental confusion, and other neurological symptoms, with a few cases even leading to neurasthenia syndrome. Toluene is more toxic to the central nervous system than benzene but has less effect on the hematopoietic system. It has been reported that long-term exposure to a benzene concentration of 188-375μg/m³ can result in noticeable subjective symptoms. The chronic harm of toluene is less than that of benzene, and at concentrations between 43-1300mg/m³, it can cause poisoning symptoms. When the three benzenes are mixed together, they can irritate the eyes and nasal mucosa, and the neurological symptoms become more severe. As summarized above, the hazards of paint mist to workers cannot be overlooked. Under high pressure, paint is atomized into micro-particles, but when sprayed by a spray gun, not all the paint reaches the spray surface. These paint particles form paint mist with the airflow. To improve the working environment for workers in the workshop and meet environmental protection requirements, it is necessary to treat the paint mist to achieve standard emissions. The SCGF type oil mist purifier produced by Sci-Tech Environmental Protection Company is designed based on the most practical paint mist purification technologies currently available domestically and internationally, making it the ideal equipment for paint mist purification.

Scope of application: This equipment can be widely used for the purification treatment of low-concentration organic exhaust gas generated in industries such as petroleum, chemical, rubber, paint, coating, furniture, home appliances, printing, etc. It can handle various types of organic substances including benzene compounds, ketones, esters, alcohols, ethers, and alkanes.

Working principle: This device consists of an oil mist absorption section, gas-liquid separation section, centrifugal separation section, high-efficiency filtration section, low-temperature plasma purification section, and activated carbon adsorption deodorization section. When the oil mist purifier unit is in operation, the paint mist first enters the atomization absorption section. In this section, waste motor oil atomization absorbs the paint mist molecules, reducing the concentration of benzene-containing exhaust gases. After absorption, the paint mist then enters the gas-liquid separation section. Here, the oil molecules and paint mist molecules in the paint mist separate through inertial collisions and turbulent collisions in the gas-liquid separator. Subsequently, under the high-speed rotation and centrifugal force of the fan blades, the flow velocity and direction of the paint mist are continuously changed, causing the flowing paint mist to collide, compress, and coalesce on the impeller. The coagulated paint mist forms micro-particles and is thrown into the inner wall of the box by centrifugal force, draining out through the leak pipe. After centrifugal separation, the vast majority of paint mist molecular particles are removed, while the escaped molecules enter the ultra-fine sponge filtration section. Here, the large specific surface area of the ultra-fine sponge strongly intercepts oil and paint mist molecules. After being purified by the first four levels, the paint mist molecules and oil mist molecules have mostly had their particle molecules removed. They then enter the plasma purification zone and the deodorization zone, where micron and submicron-level molecules are degraded, sterilized, disinfected, and deodorized before emitting completely clean air.

Performance features:

1. No water required, environmentally friendly and energy-saving;

2. High efficiency in paint mist purification, with a purification efficiency reaching 90-99%;

3. Low operating resistance of the equipment, low energy consumption;

4. Simple equipment structure, convenient maintenance and repair;

5. High purification efficiency, large dust capacity, flame retardant, low resistance, and long service life of paint mist filtration materials.

Paint mist purifiers, commonly known as spray booths, aim to maximize the purification of overspray paint mist during the painting process of workpieces. The significance of paint mist purifiers is to achieve internal and external environmental protection. Protecting the physical and mental health of operators and reducing public nuisances. Paint mist purifiers are one of the essential pieces of equipment in the spray painting production line process. Using paint mist filtration materials as the core component, spray paint exhaust passes through multiple layers of gradually denser flame-retardant glass fiber material. Through interception, collision, and absorption, the paint mist particles are accommodated within the material and gradually weathered into powder, thus achieving the purpose of paint mist purification.