Soso Encyclopedia: Paint Mist Purification

The entry on paint mist purification has been locked. Catalog 1234. The process purpose of the paint mist purification machine, commonly known as the technological equipment, is to purify the overspray paint mist during the painting process of workpieces as much as possible. The significance of the paint mist purification machine is to achieve internal and external environmental protection purposes. It protects the physical and mental health of operating employees and reduces public nuisances. The paint mist purification machine is one of the essential devices in the spray painting and coating production line process.

The paint mist purification machine uses paint mist filtration material as its core component. Spray painting exhaust passes through multiple layers of gradually denser flame-retardant glass fiber material. Paint mist particles are intercepted, collided with, and absorbed by these materials, gradually becoming powder-like and thus achieving the purpose of purifying paint mist. Currently, the coatings used in spraying are still solvent-based. The organic solvents—benzene, toluene, 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, tiny paint mist droplets form dust, which also disperses in the workshop air. The three benzenes belong to highly toxic solvents. When emitted into the workshop air during operations, workers inhale them through their respiratory tracts, which can cause acute and chronic poisoning. This mainly damages the central nervous system and hematopoietic system. Short-term inhalation of high concentrations (1500 mg/m³) of benzene vapor can lead to aplastic anemia. Long-term inhalation of low concentrations of benzene vapor can also cause nausea, vomiting, confusion, and other neurological symptoms, with a few cases leading to neurasthenia syndrome. Toluene's toxicity to the central nervous system is stronger than that of benzene, but its effect on the hematopoietic system is less than that of benzene. According to reports, long-term exposure to a benzene concentration of 188-375 µg/m³ can produce significant subjective symptoms. The chronic hazards of toluene are less than those of benzene. At concentrations of 43-1300 mg/m³, poisoning symptoms may appear. When the three benzenes are mixed, they can irritate the eyes and nasal mucosa, and neurological symptoms become more severe. In summary, the harm of paint mist to workers cannot be ignored. Under high-pressure conditions, paint is atomized into micro-particles, but during spray gun application, not all the paint reaches the spray-painted surface. These paint particles form paint mist with the airflow. To improve the working environment for workers in the workshop and meet environmental requirements, it is necessary to treat the paint mist for standard-compliant emissions. This equipment can be widely used for the purification treatment of low-concentration organic exhaust gas generated in industries such as petroleum, chemical, rubber, paints, coatings, furniture, home appliances, and printing. It can handle various types of organic substances, including benzene compounds, ketones, esters, alcohols, ethers, and alkanes.

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

2. High paint mist purification efficiency, up to 90-99%;

3. Low equipment running resistance, low operating energy consumption;

4. Simple equipment structure, convenient maintenance and repair;

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

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 purification unit is in operation, the paint mist first enters the atomization absorption section. This section uses atomized waste engine oil to absorb paint mist molecules, reducing the concentration of benzene-containing exhaust gases. After absorption, the paint mist exhaust gas then enters the gas-liquid separation section. This section separates oil molecules and paint mist molecules from the gas through inertial collision and turbulent collision of the gas-liquid separator. Then, under the high-speed rotation and centrifugal force of the fan impeller, the flow rate 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, which are thrown onto the inner wall of the box by centrifugal force and discharged through the liquid drainage pipe.

After centrifugal separation, most of the paint mist molecular particles are removed, and the escaped molecules enter the ultra-fine sponge filtration section, where ultra-fine sponges with a large specific surface area strongly retain oil and paint mist molecules. After being purified by the first four levels, the paint mist molecules and oil mist molecules have had their particle molecules basically removed. They then enter the plasma purification zone and deodorization zone, where micron and submicron-level molecules are degraded, sterilized, disinfected, and deodorized before emitting completely clean air.

My evaluation: Entry evaluation: 0 points (evaluated by 8 people).