Adsorption and nonthermal plasma desorption process for concentrating NOx in flue exhaust gas
Adsorption and nonthermal plasma desorption process for concentrating NOx in flue exhaust gas
复制标题
吸附与非热等离子体解吸浓缩烟气中NOx的工艺
DOI：
10.1109/ias.2001.955496
复制
发表时间：
2001
期刊：
影响因子：
--
通讯作者：
T. Yamamoto
中科院分区：
文献类型：
--
作者：
M. Okubo;G. Tanioka;T. Kuroki;T. Yamamoto
有害空气污染物（HAP）排放的气体流速通常很大，其浓度很低（以百万分之一计）。当我们尝试直接处理大流量、低浓度的废气时，设备体积变大，导致运行成本高。本研究的目的是通过对填充在屏障式填料床非热等离子体反应器内的吸收颗粒中吸收的气体进行解吸，将大流量、低浓度的废气转化为小流量、高浓度的废气。在本报告中，我们特别关注难治性NO/sub /。吸附球为孔径为1 nm的沸石分子筛球（MS-13X）。等离子体解吸是通过使用交流60hz、交流20khz或脉冲210hz电源中的任何一种对等离子体反应器施加高压来进行的。我们发现在重复吸附和解吸过程中，NO/sub x/可以被有效解吸。由于表面温度迅速升高，在AC为20 kHz时，除电子冲击脱附外，还发生了热附加脱附。在脉冲电源解吸过程中，浓度迅速升高，并在较短时间内达到最大值。在解吸过程中，关闭反应器是有效的。首次成功实现了NO/ subx /的非热等离子体浓缩解吸，吸附/解吸过程重复了12次以上。
The gas flow rates for hazardous air pollutant (HAP) emissions are generally large and their concentrations are low (in ppm levels). When we try to treat directly the large flow rate and low concentration exhaust gas, the size of the equipment becomes large, resulting in high operating cost. The objective of this study is to convert the exhaust gas with large flow rate and low concentration into the one with small flow rate and high concentration by desorbing the absorbed gas from the absorbent pellets packed inside a barrier-type packed-bed nonthermal plasma reactor. In this report, we especially focused on difficult to treat NO/sub x/. The absorbent pellets were molecular sieve spheres (MS-13X) made of zeolite with 1 nm pore diameter. The plasma desorption was carried out by applying the high voltage to the plasma reactor using any one of AC 60 Hz, AC 20 kHz or pulse 210 Hz power supplies. We found out that NO/sub x/ could be desorbed effectively in the repeated adsorption and desorption process. Since the surface temperature increased rapidly, the desorption with AC 20 kHz took place not only by the electron impacts but also by the heat addition. In the desorption using the pulse power supply, the concentration rapidly increased and became maximum in relatively short time. It was effective to close the reactor in the desorption process. For the first time a nonthermal plasma concentrating desorption of NO/sub x/ was successfully achieved as the adsorption/desorption was repeated more than 12 times.