Simultaneous Removal of Extremely High or Low Concentration NOx, SOx and Particulate Using Plasma Emission Treatment Combined Concentrating Technology

在低温等离子体化学复合工艺的基础上，开发了同时去除颗粒物、NOx和SOx的工艺，用于处理电厂和锅炉低浓度（30 ~ 200 ppm）排放物。该系统由两级干法等离子体氧化工艺和湿法化学工艺组成。另外，间接等离子体法通过在300℃的高温气体中注入活化空气，将NO氧化为NO_2，其处理所需的气体流量降低到原气体流量的1/5以下。这种间接等离子体技术从实验室实验进一步扩展到中试规模的NOx和SOx处理系统，该系统来自城市燃气和重油燃烧的450 Nm ^3/hr范围内的锅炉排放物。燃气的NOx去除率超过90%，但燃油的NOx去除率由于缺少臭氧的存在而稍低。 关于我们 与现有的脉冲电源集中。SO_2的去除率在85 ~ 90%之间。对洗涤塔出水水质进行了调查，证明可以处理。此外，开发了等离子体浓缩技术，将低浓度气体的大流量转化为高浓度气体的小流量。也就是说，低浓度烟道气首先长时间吸附在吸附材料如分子筛13 X颗粒或疏水沸石蜂窝上，并将脉冲等离子体施加到吸附材料以在几分钟内解吸吸附的NO。采用等离子体-化学复合法处理低流量高浓度NO，减小了等离子体反应器的体积。反应副产物被鉴定为低。此外，还开发了一种处理大于2,500 ppm NOx的新技术，即采用氮等离子体干法一步法将NO直接还原为N_2。NOx浓缩技术和氮等离子体的组合能够实现非常经济和有吸引力的系统，并且可以用于许多工业应用。少

Based on nonthermal plasma chemical hybrid process developed previously, simultaneous removal of particulates, NOx and SOx was developed for treating the low concentration (30〜200 ppm) emission from the power plant and the boiler application. This system consists of two-stage dry plasma oxidation process and wet chemical process. In addition, the indirect plasma method which NO can be oxidized to NO_2 extremely effective by injecting the activated air into the high temperature gas in the range of 300℃, which the required gas flow rate to be treated by the plasma was reduced to less than 1/5 of the primary gas flow rate. This indirect plasma technique was further expanded from the laboratory experiment to the pilot-scale NOx and SOx treatment system from the boiler emission in the range of 450〜1,470 Nm^3/hr for both city gas and heavy oil firings. The NOx removal efficiency for gas firing exceeds 90% but NOx removal efficiency for oil firing was somewhat lower due to the lack of ozone c … More oncentration with the present pulse power supply. The removal efficiency of SO_2 was in the range of 85〜90%. The quality of treated water from the scrubber was investigated and proved to be disposed. Moreover, the plasma concentration technique was developed to convert the large flow rate with low concentration gas to small flow rate with high concentration. That is, the low concentration flue gas was first adsorbed on the adsorbent materials such as molecular sieve 13X pellets or hydrophobic zeolite honeycomb for a long time and the pulsed plasma was applied to the adsorbent material to desorb the adsorbed NO within few minutes. Then, the high concentration NO with low flow rate was treated by the plasma-chemical hybrid process, which was able to reduce the size of the plasma reactor. Reaction byproducts were identified to be low. Moreover, a new technology for treating more than 2,500 ppm NOx was developed to reduce NO directly to N_2 using the nitrogen plasma in dry one-step process. The combination of NOx concentration technique and nitrogen plasma is able to achieve an extremely economical and attractive system and can be used for many industrial applications. Less