Removal of NOx from Combustion Exhaust gas by Using Radicals in Arc Plasma

利用电弧等离子体中的自由基去除燃烧废气中的氮氧化物

• 批准号: 12650215
• 负责人: MORIMUNE Takaaki
• 金额: $ 0.38万
• 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: 2000
• 资助国家: 日本
• 起止时间: 2000 至 2001
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-12650215/
• 关键词: Combution Exhaust gas; NOx Removal Rate; Arc Plasma; Pollutant; Radical; 水素ラジカル; 炭化水素ラジカル; 燃焼排ガス

A technique for removing the NOx contained in combustion exhaust gas has been developed by using radicals produced in the mixing arc plasma. By feeding the gas mixture (Ar+NH_3), (Ar+H_2) and (Ar+diesel oil) into arc plasma torch, ammonia, hydrogen and diesel oil radicals such as NH_2, NH, HC, N, H are produced, and these radicals are mixed in a reactor with the simulated exhaust gases (N_2+NO) and (Air+N_2+NO) respectively. The NO decreases as a result of the formation of the innocuous products N_2, H_2O and CO_2 when the O_2 is not contained in the gas. Under present experimental conditions, the thermal De-NOx process and the oxidation of ammonia, hydrogen and Diesel oil are not expected. In the case of the gas (Air+N_2+NO), NOx increase with increasing input power to plasma. The effects of input power to plasma, molar ratio NH_3/NO, H_2/NO and diesel oil/NO, cathode length and gas flow rate on the NOx removal rate are investigated experimentally.Experimental results are summarized as follows ;(1) The NOx removal rate increases with increasing input voltage of plasma and with decreasing the distance ratio L/d between nozzle exit and exhaust pipe. When the hydrogen, ammonia and diesel oil injections at a molar ratio greater than stoicheiometric value, the NOx removal rate increases with increasing of these radicals such as NH_2, NH, H, N, HC in the case of simulated exhaust gas (N_2+NO).(2) As for the simulated exhaust gas (Air+N_2+NO) under a oxygen concentration of 3.2 %, the NOx concentration decreases by hydrogen or diesel oil injections, and the NOx decreases by ammonia radicals at a oxygen of 4.2 %, while the deposits on the anode nozzle are observed in the case of diesel oil injection.

利用混合电弧等离子体产生的自由基，开发了一种燃烧废气中NOx的去除技术。将（Ar + NH_3）、（Ar + H_2）和（Ar+柴油）混合气体通入电弧等离子体炬中，产生NH_2、NH、HC、N、H等氨、氢和柴油自由基，并将这些自由基分别与模拟废气（N_2 + NO）和（Air + N_2 + NO）在反应器中混合。当气体中不含O_2时，由于生成了无害的产物N_2、H_2O和CO_2，NO含量降低。在目前的实验条件下，热脱硝过程和氨、氢、柴油的氧化是不可能的。在气体（Air + N_2 + NO）的情况下，NOx随着输入功率的增加而增加。实验研究了等离子体输入功率、NH_3/NO、H_2/NO和柴油/NO摩尔比、阴极长度和气体流量对NOx去除率的影响，实验结果表明：（1）NOx去除率随等离子体输入电压的增大和喷嘴出口与排气管的距离比L/d的减小而增大;在模拟废气（N2 + NO）中，当氢、氨和柴油的摩尔比大于化学计量比时，随着NH2、NH、H、N、HC等自由基含量的增加，NOx的去除率增加。(2)对于氧浓度为3.2%的模拟废气（Air + N2 + NO），喷氢或柴油可降低NOx浓度，而在氧浓度为4.2%时，氨自由基可降低NOx浓度，而喷柴油则在阳极喷嘴上观察到沉积物。

项目成果

MORIMUNE,T. and BANBA,Y.: "Removal of NOx from Combustion Exhaust gas by Using Radicals in Arc Plasma"Preprint of Japan Society of Mechanical Engineers. No.023-1. 187-188 (2002)

森宗，T.

森棟隆昭,番塲良夫: "熱プラズマによるラジカルの生成と燃焼排ガス中のNOx除去"日本機械学会関西支部総会講演会講演論文集. No.014-1. 2-13-2-14 (2001)

Takaaki Morimune、Yoshio Banjo：“通过热等离子体产生自由基和从燃烧废气中去除 NOx”日本机械工程师学会关西分会会议记录第 014-1 号。 14 (2001)

森棟隆昭,番塲良夫: "プラズマ生成ラジカルによる燃焼排ガス中のNOxの除去"日本機械学会環境工学総合シンポジウム論文集. (発表予定). (2001)

Takaaki Morimune、Yoshio Banzou：“通过等离子体产生的自由基去除燃烧废气中的 NOx”日本机械工程师学会环境工程研讨会论文集（待发表）。

MORIMUNE,T. and BANBA,Y.: "Removal of NOx from Combustion Exhaust gas by Using Radicals in Arc Plasma Jet"Preprint of Japan Society of Mechanical Engineers. No.01-12. 343-346 (2001)

森宗，T.

森棟隆昭, 番塲良夫: "熱プラズマによるラジカル生成と燃焼排ガス中のNOx除去"日本機械学会関西支部第76期総会講演会論文集. No.2. 13-14 (2001)

Takaaki Morimune、Yoshio Banjo：“热等离子体的自由基生成和燃烧废气中的 NOx 去除”日本机械工程学会关西分会第 76 届大会会议记录第 2. 13-14 号（2001 年）。