Journal Article

Study on the influencing factors of removal of NOX from cement kiln flue gas by sewage sludge as a denitration agent

Xu, Zhenghui, Luo, Jun, Xiao, Xiang, Huang, Haizhen, Huang, Jianhang, Wu, Haiwen, Fang, Ping

2020

Overview

Experimental study on the influencing factors of using sewage sludge as a denitration agent for cement industry was carried out on a self-made laboratory-scale fluid-bed reactor. Results indicate that sludge combustion at 900 °C shows an ideal NO X (the sum of NO and NO 2 ) removal activity under simulated working conditions of cement precalciner. The optimal removal efficiency of NO X can reach 70.36 ± 3.59% in the presence of cement raw meal (CRM) at a sludge particle size range of 0.18–0.25 mm and the sludge dosage of 0.75 g/min. Besides, the NO X removal efficiency increases to 76.94 ± 5.02% in the absence of CRM, indicating that cement raw meal inhibits the NO X removal. This phenomenon may be attributed to the fact that CRM has promotion effect on NH 3 produced and obvious inhibitory effect on CO produced; while NH 3 and CO play a leading role in NO X reduction, the combined effect leads to the decrease of NO X removal. Moreover, the relationship between the composition of CRM on the inhibition of NO X removal is MgO < CaCO 3 < CRM < Al 2 O 3

• Publisher: Springer Berlin Heidelberg,Springer Nature B.V
• Subject: Aluminum oxide / Ammonia / Aquatic Pollution / Calcium carbonate / Carbon monoxide / Cement / combustion / Denitration / Earth and Environmental Science / Ecotoxicology / Efficiency / Environment / Environmental Chemistry / Environmental Health / Environmental science / Ferric oxide / Flue gas / industry / Kilns / Nitrogen dioxide / Nitrogen oxides / particle size / pollution / Precalciners / Research Article / Resource utilization / Sewage sludge / Sewer gas / Sludge / Sludge disposal / Urea / Waste Water Technology / Water Management / Water Pollution Control / Working conditions