Investigation of the NO removal process of ultra-low temperature adsorption-rapid regeneration

NO removal facility installed at the very tail-end of the flue gas could reduce the effects of dust and SO2 poisoning, the problem is to figure out how to remove NOx at ultra-low temperature. Relying on rotary reactors, a NOx adsorption-enclosed regeneration process (NAER) was proposed, by which NOx is adsorbed onto the adsorbent at ambient temperature and then to on-site degrade in a high-temperature and enclosed environment with the high-concentration CO. Metal-doped activated carbon emerged as the optimal catalyst for shortening the cooling temperature difference. The results indicated that the maximum adsorption capacity for NO is 38.67 mg/g at 50 degrees C, and NO conversion reaches exceed 90 % at 250 degrees C when 1400 ppm CO and 700 ppm NO are introduced into the reactor. The novel enclosed high-concentration of CO reduction regeneration encourages more NO to participate in the reaction, promoting the deep decomposition of nitrate and avoiding the overflow of NOx at the outlet. The difference between the breakthrough time and regeneration time spans 12-21 min. The carbon consumption is 0.0087 %/min, ensuring the long-term and continuous operation of the material. The current study explains the reaction mechanism of NO adsorption via in-situ FTIR. Life cycle assessment method is applied to analyze NAER's emission standards, while life cycle inventory method calculates the economic cost, which stands at 287.06 RMB. The reduced cost is primarily reflected in the energy and raw materials inputs. The proposed process holds significant potential for optimizing the ultra-low emission of flue gas.