低温等离子体处理恶臭废气研究

用低温等离子处理恶臭气是一门新兴的技术。通过对典型的恶臭物质硫化氢、乙硫醇、苯、甲苯等恶臭物质的低温等离子脱除试验,结果表明:采用电晕放电形式的低温等离子体处理恶臭废气是可行的,停留时间越长、电压越高脱除效果越好,当停留时间>9s,电压>20kV时恶臭物质的去除率基本>90%,进一步延长停留时间和升高电压,去除效率并不会大幅度提高。低浓度的烷烃背景气体对恶臭的脱除效率基本无影响,高浓度的烷烃背景气体使恶臭物的脱除效率下降,较高浓度氢气的存在也会降低恶臭物的脱除效率,而氧气浓度的提高可以显著提高硫化氢脱除率。

RESEARCH ON THE REMOVAL OF ODOR SUBSTANCES BY LOW TEMPERATURE PLASM

Using low temperature plasma to treat odor gas is a newly emerging technology.It was studied the removal of some typical odor substances(i.e.hydrogen sulfide,ethyl mercaptan, benzene,and toluene) by low temperature plasma treatment.The results show:using corona discharge plasma to treat odor gas is practicable; the longer the residence time and the higher the voltage,the better the removal effect;when the residence time is longer than 9 s and the voltage is higher than 20 kV ,the odor removal efficiency is basically above 90%; further increasing the residence time and the voltage won't dramatically increase the removal efficiency; basically,the alkane background gas with a low concentration has no effect on the odor removal efficiency,while the alkane background gas with a high concentration will decrease the odor removal efficiency; besides, the presence of hydrogen with a higher concentration will also decrease the odor removal efficiency,while increasing the concentration of oxygen will remarkably increase the removal efficiency of hydrogen sulfide.