High concentration NOx, SOx and particulate removal system using the plasma-chemical hybrid process

研究的目的是在高烟气温度（>250℃）下去除高浓度（1，000 ~ 2，000 ppm）的NOx和SOx，同时去除柴油机和锅炉排放的颗粒物（PM）。采用吸附-等离子体复合工艺控制柴油机排放，采用等离子体化学复合工艺控制锅炉排放。在柴油机干法净化过程中，采用分子筛吸附剂（MS-13 X）对NOx进行有效吸附，并在柴油机尾气净化系统中利用N2对吸附的NOx进行脱附再生。脱附的高浓度NOx被低温等离子体完全还原为N_2和O_2。由于柴油机中的水分含量受到NOx吸附过程的影响，因此对硅酸盐的使用进行了研究。结果表明，硅酸盐的使用是放置在吸附剂的上游。(or高温侧）。其他疏水吸附剂，如Mn基吸附剂 ...更多信息 还发现吸附剂非常适合于NOx吸附。在120℃时，NOx的热脱附仍能有效地进行，重复热脱附后，NOx浓度增加，脱附效率在7次以上保持不变。对于颗粒物而言，传统的柴油机微粒过滤器（DPF）可以捕集颗粒物，并在250℃的气体温度下与NO_2或O_3进行燃烧，即使在室温下也可以进行燃烧。采用臭氧发生器将气流中的NO氧化成NO_2，再用Na_2SO_3溶液将生成的NO_2通过化学洗涤器还原成N_2。2和水溶性无毒的Na_2SO_4。所需的O_3量约为气流中NO浓度的一个化学计量。研究了气流中CO_2和O_2浓度对脱硝效果的影响，并进行了优化研究，结果表明，在整个实验过程中，脱硝效果达到85%以上。少

The objective of the research is to remove high concentration (1,000〜2,000ppm) NOx and SOx at high flue gas gas temperature (>250℃), and also to remove particulate matters (PM) from diesel engine and boiler emission. The adsorption and plasma hybrid process were employed to control the diesel emission and the plasma chemical hybrid process was employed to control the boiler emission. In the dry process for diesel emission control, the adsorbent using molecular shieve (MS-13X) was used to adsorb NOx effectively, and adsorbed NOx were desorbed and regenerated using N2 by means of heat in the diesel emission system. The desorbed high concentrated NOx were totally reduced by the nonthermal plasma to form N_2 and O_2. Since the moisture content in the diesel engine was affected by NOx adsorption process, the use of silicate was investigated. As the results, the use of silicate was to place upstream of the adsorbent.(or high temperature side). Other hydrophobic adsorbent such as Mn based ads … More orbent was also found to be extremely suited for NOx adsorption. We also found that NOx desorption by heat took place effectively even at 120℃ and NOx concentration was increased with repetitive thermal desorption and reached a constant desorption efficiency beyond 7 repetitive desorption process. As far as PM is concerned, PM was trapped with the conventional diesel particulate filter (DPF) and incinerated with either NO_2 at the gas temperature of 250℃ and O_3.even at the room temperature.On the other hand, the plasma chemical process used for boiler emission control, ozpnizer was used to oxidize NO to form NO_2 in the gas stream and formed NO_2 was reduced by the chemical scrubber using Na_2SO_3 solution to achieve N_2 and water soluble and nontoxic Na_2SO_4. The required amount of O_3 was approximately one stoichiometric of NO concentration in the gas stream. The NOx reduction was affected by CO_2 and O_2 concentrations in the gas stream and the optimization study was performed, resulting that more that 85% of NOx reduction was achieved throughout the experiments. Less