Effect of Ca/Ti-based additives on particulate matter emission reduction during MSW combustion.

In this paper, the emission reduction efficiency and control mechanisms for particle emissions during waste incineration with Ca-based and Ti-based additives was studied. Experimental research on controlling PM 10 particle emissions during municipal solid waste (MSW) incineration with Ca-based additives (CaCO 3 , CaO) and Ti-based additives (TiO 2) reveals that at a combustion temperature of 1100 °C, the reduction efficiencies of CaCO 3 , CaO, and TiO 2 for PM 0.3 are 30.02 %, 18.01 %, and 25.90 % respectively. However, they have no effect on reducing PM 1-2.5. The Ca in CaO and CaCO 3 additives competes with alkali metals in MSW, inhibiting the formation of volatile alkali metal sulfates in high-temperature flue gas. At high temperatures, TiO 2 reacts with Na and Ca salts in MSW to form Na4TiO 4 and CaTiO 3 respectively. The transformation of Na 4 TiO 4 inhibits the conversion of Na to NaCl and Na 2 SO 4 , while the formation of CaTiO 3 increases the ash fusion point of coarse particles. The increase in ash fusion temperature suppresses the "breakdown" process of coarse mineral particles in ash and weakens the aggregation ability of fine particles. The efficiency of solid additives in reducing PM 10 during MSW incineration decreases with the increase in ash fusion temperature of fly ash particles. • Ca-based and Ti-based additives promote PM 1-2.5 during combustion of MSW. • Ca-based additives regulate PM 10 by curing S in MSW combustion flue gas. • TiO 2 reduces the emission of submicron particles through the conversion of Na 4 TiO 4. • The increase of ash melting characteristic temperature can reduce PM 2.5-10. [ABSTRACT FROM AUTHOR]