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Simultaneous Removal of PM and NOx in Combustion Exhaust Gas by Non-thermal Plasma

低温等离子体同时去除燃烧废气中的PM和NOx

基本信息

批准号：
15560191
负责人：
MORIMUNE Takaaki
金额：
$ 2.3万
依托单位：
Shonan Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2003
资助国家：
日本
起止时间：
2003 至 2004
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-15560191/
关键词：
Combustion Exhaust Gas Pollution Particulate Matter Nitrogen Oxides Total Hydrocarbon Removal Efficiency Non-thermal Plasma Corona Discharge Reactor 燃焼排ガス粒子状物質窒素酸化物浄化方法

项目摘要

Electrical discharge process using corona is effective in reducing particulate matter(PM), nitrogen oxides(NOx) and total hydrocarbon(THC) contained in diesel engine exhaust. We experimentally evaluate the application of DC corona discharge reactor to reduce the PM, NOx and THC from diesel exhaust. Particulate trapping in a corona reactor can be accomplished by electrostatic precipitation. The accumulated PM on a nichrome electrode of reactor can be regenerated by the controlled burning process. In a corona reactor, NO is oxidized to NO_2 and NO_2 reacts with H_2O contained in exhaust. NOx decreases as a result of HNO_3 formation in a reactor, and successively HNO_3 is neutralized on the filter paper contained alkali. A corona reactor consists of cylindrically-shaped outer electrode made of stainless steel and central electrode made of rolled nichrome wire. In this study, the effects of corona voltage, current and the space velocity of reactor on soot collection efficiency, NOx removal rate and THC reduction rate are investigated. Also discussed is the particle size distribution of soot collected by a reactor.The conclusions are summarized as follows ;(1)A corona discharge reactor is capable of reducing diesel particulate matter PM, nitrogen oxides NOx and total hydrocarbon THC levels simultaneously.(2)The soot collection efficiency of 45-95% is obtained at a corona input power of 5-10W (1-5kV), under the space velocity of 9200-29500/h, while the NOx removal rate of 2-10%, THC reduction rate of about 15% are observed.(3)Particulate trapping of fine-particles less than 1μm, which has harmful effects on the human body, can be accomplished by corona discharge process.

利用电晕放电的方法可以有效地降低柴油机排气中的颗粒物（PM）、氮氧化物（NOx）和总碳氢化合物（THC）。我们实验评估直流电晕放电反应器的应用，以减少柴油机排气中的PM，NOx和THC。电晕反应器中的颗粒捕集可以通过静电沉淀来实现。在反应器的镍铬合金电极上积累的PM可以通过控制燃烧过程再生。在电晕反应器中，NO被氧化成NO_2，NO_2与废气中的H_2O反应。NOx在反应器中生成HNO_3而减少，HNO_3在含碱滤纸上被中和。一种电晕反应器，由不锈钢制成的圆柱形外电极和轧制镍铬合金丝制成的中心电极组成。研究了电晕电压、电晕电流和反应器空速对碳烟收集效率、NOx去除率和THC去除率的影响。研究结果表明：（1）电晕放电反应器能够同时降低柴油机颗粒物PM、氮氧化物NOx和总烃THC的含量。（2）在电晕输入功率为5- 10 W（1- 5 kV）、空速为9200-29500/h的条件下，碳烟的收集效率为45-95%，NOx的去除率为2- 10%，THC的去除率为15%左右。（3）电晕放电过程可实现对小于1μm的对人体有害的微粒的捕集。