Synthetic leather, artificial leather and other leather production industry waste gas treatment technology
synthetic leatheris a high-density woven fabric (non-woven) as the base fabric for polyurethane impregnation and coating processing products. Due to the rapid expansion of the application field of synthetic leather products and the high added value of the products, the production scale has gradually expanded, but the exhaust emissions and environmental problems caused by this have gradually become prominent. Therefore, it is of great practical significance to adopt economical and practical treatment technology and develop appropriate process flow to make the exhaust emission index of many synthetic leather factories reach the standard.
synthetic leather is the volatilization of organic solvents, including the volatilization of resins and solvents during batching, transportation and storage; the volatilization of organic matter during coating or impregnation; the volatilization of organic matter during heating in the oven; the volatilization of organic matter during post-treatment. Exhaust gas pollutants are related to the specific process and formula composition. For a certain process formula can often be changed, so the specific pollutants it produces are not fixed. The general organic solvent pollutants in the dry process production process are: DMF, toluene, xylene, butanone, etc.; the general organic pollutants in the wet process production process are DMF.
Dimethylformamide (DMF) as a solvent used in recent years, its use is very wide, mainly used as a polymer synthesis solvent or intermediate raw materials, especially used as polypropylene fine fiber spinning solvent, also used in the manufacture of artificial leather or leather (or PVC fabric, laser leather, waterproof cloth) surface materials as polyurethane resin processing solvent, is also used as petroleum products such: ethylene, butene separation extraction solvent, acetylene recovery and anti-rust paint solvent, etc. Dimethylformamide is a moderately low toxic substance, which can invade the body through the respiratory tract, skin and digestive tract, causing toxic reactions.
synthetic leather
Exhaust gas pollutants are related to specific processes and formulations. For a certain process, the formula can often be changed, so the specific pollutants produced are not fixed. The general pollutants in the production process are:
① polyurethane dry process: organic solvents (DMF, toluene, xylene, butanone, etc.)
② Polyurethane wet process: organic solvent (DMF)
③ PVC and other related processes: plasticizer smoke (dioctyl phthalate, etc.), vinyl chloride, hydrogen chloride, organic solvents, lead
④ Post-treatment process: organic solvents (DMF, toluene, xylene, butanone, butyl acetate, etc.), particulate matter
⑤ Microfiber process: organic solvents (DMF, toluene, xylene, etc.)
Synthetic leather, artificial leather waste gas treatment technology
Volatile organic compounds (VOCs) refer to organic compounds that can be discharged into the air in gaseous form under normal pressure. According to their chemical structures, they are: alkanes, aromatic hydrocarbons, esters, aldehydes, etc. Common organic compounds such as: benzene, toluene, xylene, styrene, methyl chloride and so on. Volatile organic compounds (VOCs) continue to accumulate after entering the atmosphere, forming particulate matter and organic aerosols, causing cancer, harming the growth of animals and plants, and permanently affecting the ecological environment.
Nanjing Yongyan Environmental Protection Technology Company first proposed the concept of "high temperature plasma incineration" (invention patent), which is the enterprise (worldwide) that has mastered the technology and applied it in practice. It opens up a new way for the treatment of organic waste gas.
high-temperature plasma incineration technology is a high-frequency (30KHz) high-voltage (100KV) high-power power supply under specific conditions of shaped energy discharge, resulting in 3 thousand ℃ plasma state high-temperature gas flow.
organic waste gas in the reactor after compression, high pressure concentrated energy discharge into high temperature plasma. The reactor pressure increases and the gas volume expands rapidly. Under the dual action of high temperature and high potential, the organic waste gas instantly (5/10000) becomes high temperature plasma, in which the long molecular chain is cracked into elemental atoms, and the organic matter removal rate is greater than 98%.
high temperature plasma incineration device can directly treat low concentration and large air volume organic waste gas without concentration. For every 10000 cubic meters/hour of organic waste gas, only 10kW of electricity is consumed.
From the consideration of capital investment and operating cost, the high temperature plasma incineration scheme is better than the concentrated adsorption + RTO incineration scheme.
Process Flow Diagram:
high temperature plasma incineration "technical advantages:
Modular design, flexible configuration, economical * * *, can handle organic waste gas with different concentrations and flows from hundreds of cubic meters to hundreds of thousands of cubic meters.
does not need to be preheated and is ready to use.
energy efficiency ratio is high, and the temperature of the exhaust gas discharge port of the equipment is only a few tens of degrees higher than the temperature of the inlet. It can handle industrial waste gas with high concentration, complex composition, inflammable and explosive, and containing water, solid and oily substances to achieve standard discharge.
Small wind resistance, low energy consumption, no consumption of natural gas, no carbon emissions. No valves and other moving parts, can be trouble-free, uninterrupted operation of tens of thousands of hours.
benzopyrene, dioxin and other difficult substances, instant decomposition, to achieve discharge standards. (It is an ideal solution to the problem of dioxin emission from waste incineration tail gas)
Natural gas incineration method because of its working mechanism and its own structural defects, in flammable and explosive places, or the treatment of waste gas containing combustible components need to consider explosion-proof problems.
high temperature plasma incineration technology is an epoch-making technological change.
