State Key Laboratory of Clean Energy Utilization, Zhejiang University
Jiaxing Research Institute, Zhejiang University

工业烟气中的氮氧化物是造成环境污染的重要原因,低温等离子体技术基于活性粒子的氧化作用,可以将污染物有效转化。 本文设计了介质阻挡等离子体发生系统,开展了低温等离子体氧化 NO 的研究,考察了能量密度,氧含量的影响。 研究结果表明在 960 ~ 1 920 J/ L 的能量密度下,NO 的转化效率随着能量密度的增大而降低;同时减小氧浓度有利于 NO 的转化;结合氧化催化剂对 NO 的转化具有明显的促进作用。 基于实验室结果,设计了 500 m3 / h 的低温等离子体结合氧化催化剂的试验装置,在工业硅矿热炉开展了中试试验。 中试结果表明对于低浓度的 NO(体积分数 0~0.005%)可完全转化,生成的 NO2初始会吸附在催化材料表面,随着反应的进行逐渐析出;对于高浓度的 NO(体积分数 0.005% ~ 0.025%),出口 NO 浓度均值为 0.001%(体积分数)。 上述结果证明低温等离子体氧化低浓度 NO 的可行性。

Nitrogen oxides in industrial flue gas are an important cause of environmental pollution. Nonthermal plasma technology is widely used to remove pollutants in flue gas, based on the oxidation of ac⁃tive particles. In this paper, a dielectric barrier discharge plasma generation system was designed andthe oxidation of NO by non-thermal plasma was investigated, focusing on the effects of specific energydensity (SED) and oxygen content. The results showed that when SED increased from 960 J/ L to 1 920J/ L, the conversion efficiency of NO decreased. At the same time, the decrease of oxygenconcentration promoted the conversion of NO. In combination with the oxidation catalyst, NOconversion could be dramatically promoted. A 500 m3 / h pilot-scale device was designed according tothe laboratory results. The test was carried out in an industrial silicon submerged arc furnace. The re⁃sults showed that NO could be completely converted with inlet NO volume fraction of 0 ~0.005%. Thegenerated NO2 was adsorbed on the surface of the catalytic material initially and gradually desorbed withthe proceeding of the reaction. For inlet NO volume fraction of 0.005% ~ 0.025%, the average outletNO concentration was 0.001%(volume fraction). The above results confirmed the feasibility of NO con⁃version employing non-thermal plasma coupled with the catalyst.

国家自然科学基金资助项目(51836006、52206119);浙江大学龙泉创新中心资助项目(ZDLQ 2020003)

陈振,包浩琪,万聪, 等. 低温等离子体氧化 NO 的研究[J]. 能源环境保护, 2023, 37(4): 76-82.

CHEN Zhen, BAO Haoqi, WAN Cong, et al. Investigation of NO oxidation by non-thermal plasma[J]. EnergyEnvironmental Protection, 2023, 37(4): 76-82.