The pollutants in the flue gas from domestic waste incineration are divided into particulate matter (dust), acid gases (HCl, HF, SO2, NOX, etc.), heavy metals (Hg, Pb, Cr, etc.) and organic toxic pollutants. In order to prevent the secondary pollution caused by these four types of pollutants in the process of waste incineration, the flue gas purification system is strictly controlled to control the emission of waste incineration flue gas. Related studies have shown that “low temperature control” and “efficient particulate trapping” are key factors for the successful operation of flue gas purification systems. In the process of waste incineration flue gas purification, the temperature must be controlled as low as possible, and a high efficiency dust collector should be used.
In the waste incineration flue gas purification system, dust removal and deacidification are also very important. Since a large amount of heavy metals, dioxins, furans and the like are present in the form of solids in the particulate matter (especially particles having a small particle size), the dust removal is also a purification process for other pollutants. Bag-type dust collector semi-dry removal of acid gas is the recommended method, such as the use of alkaline reactant (CaO) or slaked lime powder (Ca (OH) 2) as an absorbent to absorb the acidic components of the flue gas. At the same time, by utilizing the porosity of the powdered activated carbon and the selective absorption of heavy metals and organic waste gases, the dioxin in the flue gas, heavy metals, etc., are reduced by repeated cycles, so that the toxic components are reduced to the standard range.