Medium and high concentration VOCs waste gas (usually above 1000 mg/m),activated charcoaladsorption saturation is too fast,RTOBurning burns the solvent in vain and pays for the gas. The combined process of compression and condensation membrane separation takes the recovery route-the solvent in the exhaust gas is recovered instead of being disposed.
Process Principle
The process is composed of compression, condensation and membrane separation.
The first step: compression condensation. The exhaust gas enters the condensing unit after being pressurized by the compressor, and most of the organic matter is liquefied from gaseous to liquid by stage cooling. When the condensing pressure is 0.55MPa and the condensing temperature is -10 ℃ to -15 ℃, a good balance can be achieved between the recovery efficiency and the operation energy consumption.
The second step: membrane separation cycle. After condensation, the tail gas still contains a small amount of unliquefied organic matter and enters the membrane separation unit. Taking advantage of the difference in permeation rate between organic molecules and air molecules in the membrane material, VOCs preferentially permeate through the membrane layer to form concentrated gas, which is sent back to the compressor inlet for re-circulation treatment; the purified gas meets the discharge standard. Membrane separation can increase the concentration of VOCs by 5 to 10 times.
Recycling and compliance
Compared to single condensation or single membrane separation, this combined process integrates recovery and compliance in the same system. Condensation is responsible for the main recovery, membrane separation is responsible for checking, the overall recovery rate can reach more than 95%, and the emission concentration can be stably controlled at a low level.
Operating characteristics
Driven by electric power, no consumption of natural gas, no replacement of activated carbon and other consumables, no hazardous waste. Pure physical separation, no open flame, suitable for chemical, pharmaceutical, storage tank area and other explosion-proof places.
Applicable concentration
The inlet concentration of 2 grams to 20 grams per cubic meter of high concentration of exhaust gas is particularly suitable. The higher the concentration, the better the recovery economy, and the payback period is usually 1-2 years. Suitable for ketones, esters, hydrocarbons, halogenated hydrocarbons and other common solvents. Before selection, it is recommended to complete the working condition test, clarify the concentration, composition and air volume, and then match the equipment specifications.
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