摘要
采用化学热力学平衡分析方法,分析城市生活垃圾焚烧体系污染物的排放特性。主要计算了聚氯乙烯(PVC)及典型城市垃圾焚烧过程氯元素的化学平衡组成及其浓度,同时研究了脱氯剂对PVC及垃圾中氯转化的影响。计算结果表明,PVC热态反应的主要产物是HCl气体,在加入脱氯剂后温度低于600℃时,脱氯剂对HCl的脱除作用很明显;城市生活垃圾热解和燃烧过程中在温度超过600℃,垃圾中的有机氯和无机氯都将转化为HCl气体,而此时脱氯剂失去效果。由计算结果得到控制HCl生成,消除二口恶英污染物的生成反应工艺条件。
Incineration has been widely applied over the past decade for disposal of municipal solid wastes (MSWs) in China. However, high chlorine content in MSW results in two major problems: high temperature corrosion and the emission of dioxins. In this paper, thermodynamic equilibrium calculations were performed to reveal the formation and transformation of chlorine-containing compounds during thermal conversion process of PVC and MSWs under different conditions. Calculations were also applied to the reactions between Ca-based sorbents and chlorine-containing compounds. The results showed that HCl was the main chlorine containing product for PVC. For MSWs, organic and inorganic chlorine can transform into HCl gas completely when temperature was over 600?℃. Ca-based sorbents was effective on the HCl removal for PVC but ineffective for MSWs at the temperature of normal incineration conditions. Therefore, a new chlorine-removal process was proposed, which can remove chlorine and restrain dioxin emission simultaneously.
出处
《燃料化学学报》
EI
CAS
CSCD
北大核心
2003年第6期584-588,共5页
Journal of Fuel Chemistry and Technology
