METHOD OF PURIFYING EXHAUST GAS

摘要

PURPOSE: To provide a waste gas purification method by which harmful substances such as HF, HCl, SO2 , polyhalogenohydrocarbons, Hg, an Hg compound(s) and/or dust, can be separated from the waste gas containing them in a >=90% degree of separation and an absorbent for the separation can almost completely be utilized. CONSTITUTION: This method comprises: bringing a waste gas polluted with harmful substances into contact with an absorbent in a reactor 3 at 70-180 deg.C to obtain a solid-in-gas suspension; then transferring the solid-in-gas suspension to a preliminary separator 7 to remove most of solid matter of the suspension and to form a pre-purified solid-in-gas suspension; transferring the pre-purified solid-in-gas suspension together with the whole amount of fresh absorbent to a final separator 13 to almost completely collect solid matter suspended in the gas stream; then returning the solid matter collected in the final separator 13 to the reactor 3; and also returning a portion of the stream of solid matter collected in the preliminary separator 7 to the reactor 3 and discharging a second portion of this solid matter stream from the system to the outside and depositing it.