高浓度有机废水脱除燃煤烟气NOx的试验研究

为研发经济、高效的有机废物与烟气NO_x协同控制技术,分别采用丙烯酸钠、工业酒精和萘磺酸钠高浓度有机废水替代氨水、尿素等常用脱硝剂,在热态燃煤试验炉上,研究了T(烟气温度)、φ(O₂)、停留时间和废水与烟气混合方式等参数对烟气脱硝的影响. 结果表明:在烟气温度为1 190 K时,丙烯酸钠、酒精和萘磺酸钠高浓度有机废水的脱硝效率分别为12.7%、14.2%和9.1%；烟气温度为1 360 K时,三者的脱硝效率分别达到37.6%、39.8%和35.9%；烟气温度高于 1360 K后,脱硝效率下降. φ(O₂)从4.1%增至5.2%时,脱硝效率降低了约21.5%、13.1%和15.7%；而φ(O₂)升至6.8%时,脱硝效率降至11.2%~13.6%. 丙烯酸钠废水喷射入温度分别为1 185和1 303 K的烟气时,逆向喷入比正向喷入的脱硝效率分别提高30.4%和19.3%；停留时间从0.67 s升至0.82 s时,3类废水脱硝效率分别提高16.0%、18.8%和16.6%. 

Experimental Study on Removal of Nitrogen Oxides from Flue Gas with High Concentration Organic Wastewater

To develop a cost-effective collaborative control technology for organic waste and flue gas NO_x emissions, common denitrification agents (such as ammonia and urea) were substituted with sodium acrylate, industrial alcohol and benzene sulfonate high concentration organic wastewater. The impacts of temperature, oxygen content, residence time, mixing mode of water and gas and other parameters on the flue gas denitrification were tested on a coal-fired test furnace in a hot state. The results showed that the denitrification efficiencies of sodium acrylate, alcohol and naphthalene sulfonate wastewater were only 12.7%, 14.2% and 9.1% respectively when the temperature was 1190 K. Comparatively, the efficiencies reached 37.6%, 39.8% and 35.9% respectively when the temperature was 1360 K. The efficiency decreased when the temperature was higher than 1360 K. When O₂ content increased from 4.1% to 5.2%, the denitrification efficiency decreased by about 21.5%,13.1% and 15.7%. While O₂ content increased to 6.8%, the efficiency decreased from 11.2% to 13.6%. When sodium acrylate wastewater was injected into the flues at 1185 and 1303 K, the denitrification efficiency of the reverse injection mode increased by 30.4% and 19.3% than that of the forward injtction mode, respectively. The denitrification efficiencies increased by 16.0%, 18.8% and 16.6% when the residence time increased from 0.67 s to 0.82 s.