Release of HCl and H₂S during gasification of refuse derived-fuel chars

Using a horizontal tubular reactor together with chemical adsorption, release characteristics of corrosive gases, viz., HCl and H₂S, during steam and CO₂ gasification process of aged and normal refuse derived-fuels char (ARC and NRC) were investigated. Effects of gasification temperature, type and flow rate of gasification medium on their release behaviors were examined. In H₂O gasification at 950℃ the carbon gasification rates, HCl and H₂S yields of ARC are 66.1%, 100% and 74.9%, respectively, and those are 77.8%, 100% and 2.9% in CO₂ gasification, respectively. The carbon gasification rates, HCl and H₂S yields of NRC in H₂O gasification are 98.8%, 100% and 53.7%, and those are 100%, 96.2% and 10.3% in CO₂ gasification, respectively. The release characteristics of HCl and H₂S are investigated with different flow rates of H₂O and CO₂ in the NRC gasification. HCl and H₂S yields of NRC increase with increasing flow rate of H₂O, but the promoting effect can be ignored when H₂O/C is ≥ 3.3. HCl yield of NRC increases but H₂S yield decreases with increasing flow rate of CO₂.