Sustainable Mining and Metallurgy

Currently the ultra-low emission of incineration off-gas mainly adopts the following two schemes: Scheme 1, SNCR furnace denitration + mechanical rotary spray semi-dry deacidification + auxiliary dry deacidification + activated carbon adsorption + bag filter + wet deacidification +SCR denitration; Scheme 2, SNCR furnace denitrification + mechanical rotary spray semi-dry deacidification + auxiliary dry deacidification + activated carbon adsorption + bag filter +SCR denitration + wet deacidification. The main difference between the two processes is the different positions of wet deacidification and SCR denitration. Through the detailed analysis of the flue gas experience of the two process schemes and the comparison of their system equipment settings, the system process reliability and operation cost, it is found that Scheme 1 and Scheme 2 all can meet the ultra-low emission requirements of off-gas pollutants. Although Scheme 1 has a high investment in initial stage, the catalyst consumption is less, and there is no need to set a catalyst regeneration device, so the system is more stable and reliable; In addition, according to the 30-year operation life of the waste incineration plant, Scheme 1 can save about 18 million yuan of operation cost. From the perspective of long-term stable operation and cost, it is recommended to adopt Scheme 1 in engineering practice, that is, the SCR denitration system is set after the wet deacidification.