High concentration VOCs waste gas recovery equipment compression condensation membrane separation process, the higher the concentration, the greater the recovery efficiency

High concentration VOCs waste gas recovery equipment compression condensation membrane separation process, the higher the concentration, the greater the recovery efficiency

The higher the concentration, the more cost-effective the recycling

For high concentration VOCs exhaust gas,activated charcoalAdsorption often faces problems of fast saturation and frequent carbon replacement, while combustion methods can meet standards but completely destroy high-value solvents. The logic of the compression condensation membrane separation process is different from theirs - its recovery efficiency increases with increasing concentration. The higher the concentration, the more solvents can be recovered per unit of exhaust gas, and the shorter the equipment investment recovery period.

Process Principle

The exhaust gas is first pressurized by a compressor to increase the partial pressure of organic matter, creating conditions for subsequent condensation. The pressurized gas enters the multi-stage condensing unit, and the temperature gradually decreases to minus 15 to minus 25 degrees Celsius. Most of the organic matter directly liquefies from the gaseous state to the liquid solvent. After separation in the collection tank, it can be reused for production.

The condensed exhaust gas still contains a small amount of organic matter that has not been liquefied, and this gas enters the membrane separation unit. By utilizing the difference in permeation rate between organic molecules and air molecules in membrane materials, organic matter preferentially passes through the membrane layer to form concentrated gas, which is then sent back to the compressor inlet for recycling treatment; Air is intercepted and discharged in compliance with standards.

The higher the concentration, the more significant the benefits

The efficiency of condensation recovery depends on the partial pressure of organic matter in the exhaust gas. The higher the concentration, the greater the amount of solvent contained per unit volume of exhaust gas, and the absolute amount of condensed recovery will be greater. The same equipment and similar power consumption can recover several times more solvents from high concentration waste gas compared to low concentration waste gas. This process can achieve a recovery rate of over 95% for organic waste gases with medium to high concentrations (above 1000mg/m ³), especially suitable for working conditions with concentrations above 2000mg/m ³. The closed-loop design of "condensation+membrane separation" significantly improves the capture efficiency of organic matter in the system.

Economic analysis

The equipment is powered by electricity, does not burn gas, does not require replacement of consumables such as activated carbon, and does not generate hazardous waste. The higher the concentration, the greater the amount of solvent that can be recovered per ton of exhaust gas, and the shorter the investment payback period. Actual projects have shown that recycled solvents can be directly reused, significantly reducing production costs for enterprises.

Scope of application

This process is suitable for VOCs waste gas with medium to high concentrations and solvent recovery value, and has good separation effects on common solvents such as ketones, esters, hydrocarbons, and halogenated hydrocarbons. Before selecting, it is recommended to complete a working condition test to obtain accurate basic parameters such as concentration, composition, and air volume. LuoyangWohong PetrochemicalEquipment Co., Ltd. focuses on the field of VOCs membrane recycling and can provide process design and equipment manufacturing services based on customer operating parameters. First, conduct a working condition test and speak with the data.