Various VOC treatment solutions:

Volatile organic compounds (VOCs), as the main branch of organic compounds, refer to organic compounds with a saturated vapor pressure greater than 70 Pa at room temperature and a boiling point below 260 ℃ at atmospheric pressure.

From the perspective of environmental monitoring, it refers to the general term for non methane hydrocarbons detected by hydrogen flame ion detectors, including hydrocarbons, oxygenated hydrocarbons, halogenated hydrocarbons, nitrogen hydrocarbons, and sulfur hydrocarbons. There are various types of VOCs with a wide distribution. According to some foreign lists of major environmental priority pollutants, VOCs account for over 80%. VOCs undergo photochemical reactions with NOx and CnHm under sunlight, absorbing surface infrared radiation and causing greenhouse effect; Destruction of the ozone layer leads to the formation of ozone holes, which can cause cancer in humans and poisoning of animals and plants.

(1) Carbon adsorption method:

Carbon adsorption is currently the most widely used recycling technology, which utilizes the porous structure of adsorbents (granular activated carbon and activated carbon fibers) to capture VOCs in exhaust gases. The organic waste gas containing VOCs is passed through an activated carbon bed, where the VOCs are adsorbed by adsorbents, and the waste gas is purified before being discharged into the atmosphere.

When the adsorption of carbon reaches saturation, desorb and regenerate the saturated carbon bed; Heating the carbon layer with water vapor, VOCs are blown off and released, forming a steam mixture with water vapor, leaving the carbon adsorption bed together. The steam mixture is cooled by a condenser to condense the steam into liquid. If VOC is water-soluble, purify the liquid mixture by distillation; If it is insoluble in water, use a precipitant to directly recover VOCs. Due to the insolubility of the "triphenyl" used in the coating with water, it can be directly recycled.

Carbon adsorption technology is mainly used for situations where the components in exhaust gas are relatively simple and the value of organic matter recovery and utilization is high. The size and cost of its exhaust gas treatment equipment are proportional to the amount of VOCs in the gas, but relatively independent of the exhaust gas flow rate; Therefore, carbon adsorption beds are more inclined towards dilute large gas flow and are generally used for VOC concentrations less than 5000PPM. Suitable for applications such as spray painting, printing, and adhesives where the temperature is not high, humidity is not high, and exhaust volume is large, especially for the purification and recovery of halides.

Activated carbon adsorption box

Case: (Spray booth exhaust gas treatment)

(2) Low temperature plasma technology:

Low temperature plasma is the fourth state of matter after solid, liquid, and gas. When the applied voltage reaches the discharge voltage of the gas, the gas is broken down, producing a mixture including electrons, various ions, atoms, and free radicals. During the discharge process, although the electron temperature is high, the temperature of heavy particles is low, and the entire system exhibits a low-temperature state, hence it is called low-temperature plasma. Low temperature plasma degradation of pollutants utilizes the interaction between high-energy electrons, free radicals, and other active particles with pollutants in exhaust gas, causing pollutant molecules to decompose in a very short period of time and undergo various subsequent reactions to achieve the goal of pollutant degradation.

The DBD plasma reaction zone is rich in highly energetic substances such as high-energy electrons, ions, free radicals, and excited state molecules. The pollutants in the exhaust gas can react with these high-energy substances, causing them to decompose in a very short period of time and undergo various subsequent reactions to achieve the purpose of explaining pollutants. Compared with the low-temperature plasma technology generated by traditional corona discharge, DBD plasma technology has a discharge capacity 50 times that of corona discharge and a discharge density 130 times that of corona discharge. Therefore, traditional low-temperature plasma technology can only be used for indoor air odor control. Compared with other low-temperature plasma technologies, DBD plasma technology is the only technology used for industrial process waste gas treatment.

Case: (Spray booth exhaust gas treatment)

Other application areas:

Our company has developed a range of oil fume purification devices for textile printing and dyeing, including standardized oil fume purifiers, ironing machines, singeing machines, printing machines, flocking machines, etc; PVC synthetic leather, PVC gloves, flocking plastics and other industries such as plastic (POP, DBP, DINP, etc.), VoC furniture industry, spray paint industry, plastic industry, petrochemical industry, shaping oil and smoke purifiers, biomanufacturing industry, food additives and printing industry.