Xiao Xiang, Fang Ping, Huang Jian-Hang, Tang Zi-Jun, Chen Xiong-Bo, Wu Hai-Wen, Cen Chao-Ping, Tang Zhi-Xiong
South China Institute of Environmental Science, Ministry of Ecological Environment of P. R. China Guangzhou 510655 Guangdong China
The Key Laboratory of Water and Air Pollution Control of Guangdong Province Guangzhou 510655 Guangdong China.
RSC Adv. 2019 Jul 24;9(40):22863-22874. doi: 10.1039/c9ra04065j. eCollection 2019 Jul 23.
An experimental study on the effects of CO concentration on the release of reducing gases and the NO reduction efficiency by sludge reburning was carried out in a pilot scale cement precalciner. The results indicate that sludge reburning shows an ideal NO reduction activity. The best NO reduction efficiency of 54% is reached when the CO concentration is 25 vol%. Characteristic analysis of the sludge shows that the main types of reducing gases generated by sludge reburning are HCN, NH, CO and CH. Among them, CO concentration plays a crucial role in the release of HCN, CO and CH. The mechanistic study indicates that NO reduction is dominated by homogeneous reduction during the sludge reburning process, in particular the reducing gases of CO and NH have significant influences on the NO reduction. Meanwhile, the effect of CO concentration on NO reduction is mainly due to the difference in CO release. The results of the present study not only provide insight into the mechanism of NO reduction by sludge reburning, but could also contribute to the development of NO removal technology in the cement industry.
在中试规模的水泥预分解炉中开展了一项关于一氧化碳（CO）浓度对还原性气体释放及污泥再燃脱硝效率影响的实验研究。结果表明，污泥再燃表现出理想的脱硝活性。当CO浓度为25%（体积分数）时，脱硝效率最高可达54%。对污泥的特性分析表明，污泥再燃产生的主要还原性气体类型为氰化氢（HCN）、氨（NH）、一氧化碳（CO）和甲烷（CH）。其中，CO浓度对HCN、CO和CH的释放起着关键作用。机理研究表明，污泥再燃过程中脱硝以均相还原为主，特别是CO和NH等还原性气体对脱硝有显著影响。同时，CO浓度对脱硝的影响主要源于CO释放量的差异。本研究结果不仅有助于深入了解污泥再燃脱硝机理，还可为水泥行业脱硝技术的发展提供参考。
