摘要
将尿素和Ga—A型分子筛混合装入石英管中放入微波反应器里，进行从模拟富氧废气中脱除NOx的效果性能实验研究。微波Ga—A型分子筛上尿素选择性还原能有效地脱除废气中的NOx，NOx的去除率可达92％，烟气微波脱硝去除量可达70．6mg／h。尿素和Ca—A型分子筛共同使用时净化效率和微波击除量明显高于单独使用尿素或Ca—A型分子筛，单独使用Ga—A型分子筛没有微波脱硝效果。微波脱硝效果随着入口NOx浓度的增大而增大。氮氧化物的净化效率随着气体流量的增加而逐渐减小，而微波脱硝去除量随着气体流量的增加而逐渐增大。适宜的功率为259—280W，适宜的气体流量为0．5m^3／h左右，微波反应器内的漏度为104～113℃，明显低于SCR和SNCR。微波脱硝的机理是Ca—A型分子筛催化尿素和氮氧化物发生微波诱导催化反应达到脱硝的目的。
Microwave reactor with urea and Ga-A zeolites was set up to study removal of NOx with excess oxygen from waste gas. The results showed that the microwave reactor can be used to reduce NOx to the elemental nitrogen. The NOx removal efficiency was more than 92% and the NO removal was about 70. 6mg/h. Microwave denitrification effect using both urea and Ga-A zeolites is obviously more than that only using urea or Ga-A zeolites. The single use of Ga-A zeolites in the microwave reactor has no denitrification effect. The denitrification effect was increasing with increasing the initial concentration of NOx. The the purifying efficiency of NOx decreased, while the microwave denitrification amount increased with the increasing flow of waste gas. The optimum microwave power is 259 -280 W, and the optimum flow of waste gas is about 0. 5 m^3/h, temperature is 104 - 113 ℃, that obviously lower than SCR and SNCR. Mechanism of microwave denitrification can be described as the microwave catalytic induced reaction between NOx from the flue gas and NH3 decomposed by ammonium bicarbonate to produce N2 and H2O with Ga-A zeolites acting as catalyst.
出处
《中山大学学报（自然科学版）》
CAS
CSCD
北大核心
2006年第1期103-106,共4页
Acta Scientiarum Naturalium Universitatis Sunyatseni
基金
广东省自然科学基金资助项目(04300554)
