城市有机垃圾热解过程中NH3、H2S和HCl的析出特性

为了对城市有机垃圾热解过程中NH3、H2S和HCl的析出特性进行研究，采用箱式气氛炉在500~800℃热解终温下进行热解实验。热解过程中产生的NH3、H2S和HCl分别用硼酸溶液、乙酸锌-乙酸钠溶液以及NaOH溶液吸收，并分别采用分光光度法和滴定法进行量化。实验结果表明：NH3-N、H2S-S和HCl-Cl的析出率随着温度的升高而增加，热解终温为500、600、700和800℃时，NH3-N的析出率分别为39%、40%、30%和44%，H2S-S的析出率分别为18%、22%、25%和26%，HCl-Cl的析出率分别为68%、71%、76%和85%；热解终温控制在700℃有利于减少NH3-N的析出，低温热解（500℃）有利于减少H2S和HCl的析出；热解炭中S和Cl的残留率随着热解终温的升高而降低，终温800℃时的残留率分别为41%和5%。

Release characteristics of NH3, H2S and HCl during pyrolysis of organic fraction of municipal solid wastes

To investigate the release characteristics of NH3, H2S, and HCl during pyrolysis of the organic fraction of municipal solid waste (OFMSW), four pyrolysis experiments were conducted in a furnace at temperatures between 500 and 800℃. The NH3, H2S, and HCl generated during pyrolysis were absorbed by boron, zinc acetate-sodium acetate, and NaOH solutions, respectively, and then quantified by spectrophotometry or titration. The results showed that the release ratio of NH3-N, H2S-S, and HCl-Cl increased with an increase in the pyrolysis temperature. At the final pyrolysis temperatures of 500, 600, 700, and 800℃, the release ratios were 39%, 40%, 30%, and 44% for NH3-N, 18%, 22%, 25%, and 26% for H2S-S, and 68%, 71%, 76%, and 85% for HCl-Cl, respectively. The final pyrolysis temperature of 700℃ was found to reduce the release ratio of NH3-N, while the lower pyrolysis temperature of 500℃ contributed to reducing the release ratio of H2S and HCl. The contents of S and Cl in the pyrolysis char decreased with increasing pyrolysis temperature. The final pyrolysis temperature of 800℃ resulted in 41% S and 5% Cl in the char.