摘要
为了去除甲醛对大气环境的污染,分析了等离子体技术去除甲醛气体的机理,包括电子与污染物分子的直接碰撞和电场产生的活性粒子与污染物分子间发生的一系列化学反应2部分,以陶瓷环为钛酸钡和亚硝酸钠铁电体材料为载体实验研究了用高频交流电晕放电等离子体处理甲醛气体的技术。实验参数为高频交流电压8-12 kV,气流速度35-70 mm/s。实验结果表明,高频交流电晕放电等离子体技术可去除甲醛气体;增加电压,减小气体流速都能提高甲醛的去除率,钛酸钡填料的处理效果好于亚硝酸钠填料,且都优于无填料的处理效果。
The performance of removing the formaldehyde by Alternating Current corona discharge plasma is studied. The high-frequency Alternating Current power supply, ceramics rings as the packing media carrier, two types of typical ferroelectric-barium titanate and sodium nitrite as the packing media are applied in the experiment. The relations between removal efficiency of formaldehyde and voltage of power supply, flow velocity are mainly investigated and the effects of non-packing media, sodium nitrite packing media and barium titanate packing media on the removal efficiency of formaldehyde are also studied in the experiment. The power supply parameters 8,9,10 , 11 and 12 kV and the gas velocity parameters 35 mm/s, 47 mm/s, 58 mm/s and 70 mm/s are studied. The results show that the formaldehyde could be removed efficiently by high-frequency power supply corona discharge. It is also found that the removal efficiency of formaldehyde can be enhanced with higher voltage of power supply and small flow velocity; the removal efficiency is higher with barium titanate media packed than with sodium nitrite media packed, both are better than without media packed. At the same time, the mechanism of removal efficiency of formaldehyde is discussed based on the experimental results. The removal of HCHO depends on two mechanisms （a） collision between electrons and HCHO molecules and （b） reactions between gas-phase radicals and HCHO molecules.
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2007年第2期171-173,共3页
High Voltage Engineering
基金
北京市自然科学基金(8012005)
高等学校博士学科点专项科研基金(20040005009)
