Can VOC waste gas treatment equipment treat low concentration waste gas? Can be paired with adsorption concentration pretreatment

    VOCWaste gas treatment equipmentCan low concentration exhaust gas be treated? Can be paired with adsorption concentration pretreatment

Low concentration VOCs waste gas usually refers to waste gas with a concentration of several hundred milligrams per cubic meter or less. This type of exhaust gas is directly treated using membrane separation or condensation processes, which are not efficient enough - condensation requires very low temperatures, high energy consumption, and insufficient concentration driving force for membrane separation.

However, low concentration exhaust gas is not impossible to treat, and a common approach is to combine it with adsorption concentration pretreatment. The core idea is to first enrich the organic matter in high air volume and low concentration exhaust gas through adsorption materials, then desorb it into low air volume and high concentration gas, and then send it to the subsequent processing unit.

The specific process is as follows: low concentration exhaust gas enters the adsorption wheel or fixed bed adsorption device,activated charcoalOr materials such as zeolite can intercept VOCs, and the purified air can be directly discharged. After adsorption saturation, use a small amount of hot air or steam to blow and desorb, producing a high concentration and low volume of desorbed gas. The concentration of this desorbed gas can be increased to 5 to 15 times the original concentration, and the volumetric flow rate can be significantly reduced before entering the membrane separation or condensation unit for recovery or destruction.

This combination method has been applied in industries such as painting, electronics, and printing. For example, the concentration of exhaust gas in car painting workshops is often between 200 and 400 milligrams per cubic meter, with a high air volume. Using zeolite wheel for concentration and additionRTOThe process route of membrane condensation is more common, which first concentrates the exhaust gas by 10 to 15 times and then sends it to the subsequent treatment unit. Adsorption concentration pretreatment reduces the originally uneconomical low concentrationwaste gas treatmentBecoming feasible.

It should be noted that the adsorption concentration process itself consumes energy, and the hot air or steam used for desorption needs to be heated. Whether it is suitable for this combination method needs to be comprehensively judged based on the concentration of exhaust gas, air volume, and target emission standards. In situations where the concentration is too low, the adsorption efficiency is insufficient, or the desorption energy consumption is too high, other technical routes may need to be considered. Before selecting, it is recommended to complete exhaust gas testing to obtain accurate concentration and air volume data, and then evaluate whether adsorption concentration pretreatment is needed. LuoyangWohong PetrochemicalThe equipment company can provide a combination process plan based on specific working conditions.