【摘要】 本文研究了CO₂为气化介质时,等离子体辅助煤气化过程中焦油组分苯发生的非热转化特性,建立了苯、CO₂单电极放电非平衡态等离子体反应体系。通过煤气分析仪对转化反应的产物进行分析,并采用可见发射光谱技术对等离子体进行诊断。结果表明,在该反应体系中,苯转化生成的气态产物主要是CO,而H元素直接被氧化生成H₂O。能量密度对于苯的转化反应起主导作用。在相同能量密度条件下,降低苯浓度也能够提高苯的转化率,但改变气速增加反应时间并不能提高苯的转化率。此外,通过光谱分析可知苯的非热转化可由CO₂直接解离产生的氧自由基触发。更多还原

【Abstract】 A kind of single-electrode tip discharge plasma reaction systems at atmospheric pressure was built for non-thermodynamic conversion of benzene,one of tar compounds in the CO₂ plasma assisted gasification process.The gas analyzer was used to study the syngas production,and emission spectrum was used to diagnose the plasma.The results showed that the main gaseous product of benzene conversion in this reaction system is CO,and the H element is directly oxidized to H₂O.The energy density plays a dominant role in the conversion of benzene.At the same energy density,the decrease of benzene concentration can also increase the conversion ratio of benzene,However,the conversion of benzene can not be improved by changing the gas velocity and increasing the reaction time.In addition,based on spectral analysis,the non-thermal conversion of benzene can be triggered by O-radicals generated by direct dissociation of CO₂.更多还原