垃圾衍生燃料热解半焦气化过程中HCl与H2S析出规律

通过水平管式气化炉和化学吸收法，对比研究了矿化垃圾热解半焦（ARC）和常规垃圾热解半焦（NRC）在水蒸气和CO₂气化过程中腐蚀性气体（HCl和H₂S）的析出特性，考察了气化温度、气化介质类型和流量对腐蚀性气体析出特性的影响。当气化温度升至950℃，ARC在水蒸气气化过程中的碳气化率、HCl和H₂S产率分别为66.1%、100%和74.9%，而其在CO₂气化过程中的碳气化率、HCl和H₂S产率分别为77.8%、100%和2.9%；NRC在水蒸气气化过程中的碳气化率、HCl和H₂S产率分别为98.8%、100%和53.7%，而其在CO₂气化过程中的碳气化率、HCl和H₂S产率分别为100%、96.2%和10.3%。以NRC为原料，考察了水蒸气和CO₂流量对其HCl和CO₂析出特性的影响。NRC的HCl和H₂S产率均随水蒸气流量增加而增加，但当水碳比大于等于3.3时，其促进作用不再明显。NRC的HCl产率随CO₂流量的增加而增加，而H₂S产率随CO₂流量的增加而减小。

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.