聚氯乙烯/松木粉低温共热解脱氯提质特性

Characteristics of Quality Enhancement and De-Chlorination via Low-Temperature Co-Pyrolysis of PVC and Wood Powder

掌握聚氯乙烯(PVC)和木质纤维素类生物质共热解过程中脱氯提质特性,对开发生活垃圾脱氯预处理技术和实现其无害化具有重要意义。研究了PVC与松木粉(WP)在低温(200~450℃)共热解过程的提质和Cl的迁移转化特性。结果表明,在热解温度为300~350℃时,PVC和WP混合物的脱氯效率可以达到98%以上,对应的能量回收率约为76%。在300℃热解温度下停留15min,超过90%的Cl以HCl形式释放,且HCl释放量随着热解温度升高和停留时间的延长而增加。热解焦油中氯的含量很低,仅为1.80%~3.04%。低温共热解过程中,WP中木质素产生的酚羟基可以促进氯的取代反应,提高脱氯效率。

Understanding the de-chlorination and upgrading characteristics during co-pyrolysis of polyvinyl chloride(PVC)and lignocellulosic biomass is of great significance for developing de-chlorination pretreatment technology for municipal solid waste and achieving its harmless treatment.In this paper,the upgrading and migration transformation characteristics of Cl during the low-temperature co-pyrolysis of PVC and pine wood powder(WP)were studied.The migration and transformation characteristics of Cl during the low-temperature co-pyrolysis of PVC and WP were investigated.The results showed that the de-chlorination efficiency of PVC and WP mixture reached over 98%at a pyrolysis temperature of 300-350°C,corresponding to an energy recovery rate of about 76%.At a pyrolysis temperature of 300°C and a residence time of 15 minutes,over 90%of Cl was released in the form of HCl,and the release of HCl increased with increasing pyrolysis temperature and residence time.The chlorine content in the pyrolysis tar was very low,ranging from 1.80%to 3.04%.During low-temperature co-pyrolysis,the phenolic-OH generated by lignin in WP can enhance the substitution reaction of chlorine and improve the de-chlorination efficiency.