塑料在高频等离子体中的热解气化研究

Study on the plastic pyrolysis in a capacitively coupled RF plasma reactor

采用高频电容耦合等离子体对塑料聚乙烯进行热解处理,重点考察热解气体产物的分布及组成,结果表明,热解产物中包括可燃气和热解碳黑,几乎没有发现焦油产生.高频N2等离子体热解时,热解气体中主要成分为H2、CH4以及其它有机小分子;进入气体中的C转化率低,而H转化率高.当采用水蒸汽等离子体热解时,热解除产生大量H2、CH4外,还有CO以及其它有机小分子气体产生,同时进入气体中的C转化率提高.

Pyrolysis is an alternative disposal method with the possibility for recovery of valuable products from waste plastic. In the present paper, we investigate the pyrolysis treatment of plastic using a capacitively coupled radio-frequency （RF） plasma reactor. Extensive investigations have already been carried out to evaluate the product characteristics from various pyrolysis processes under different operating conditions such as temperature, residence time, pressure, etc. Under the experimental conditions, pyrolysis experiments with plastic powder showed that two product streams were obtained：combustible gas and pyrolytic char. Pyrolysed gas was a mixture of H2, CH4 and other organic compounds. The conversion of C into the gaseous product is very low, while the conversion of H is high. When vapor were added in the reaction, CO were produced and the conversion of C into the gaseous product increased.