Solid waste incineration is mainly sludge incineration, and the main components of incineration flue gas include HCl, SO2, NOx, Co, HF, Hg, dioxin, dust, etc. The main treatment processes of flue gas are generally desulfurization in furnace, dry desulfurization, sell-off, high-temperature electrostatic dust removal, bag dust removal, activated carbon injection, desulfurization, electrostatic dust removal, de whitening and heat exchange. The emission standard of flue gas shall be in accordance with the corresponding standard limits in Table 4 of the pollution control standard for domestic waste incineration and the comprehensive emission standard of air pollution.