Using sewage sludge as a flue gas denitration agent for the cement industry: Factor assessment and feasibility

被引：15

作者：

Fang, Ping ^{[1
,2
]}

Tang, Zijun ^{[1
,2
]}

Xiao, Xiang ^{[1
,2
]}

Huang, Jianhang ^{[1
,2
]}

Chen, Xiongbo ^{[1
,2
]}

Zhong, Peiyi ^{[1
,2
]}

Tang, Zhixiong ^{[1
,2
]}

Cen, Chaoping ^{[1
,2
]}

机构：

[1] Minist Ecol & Environm, South China Inst Environm Sci, Guangzhou 510655, Guangdong, Peoples R China

[2] Key Lab Water & Air Pollut Control Guangdong Prov, Guangzhou 510655, Guangdong, Peoples R China

来源：

JOURNAL OF CLEANER PRODUCTION | 2019年 / 224卷

基金：

中国国家自然科学基金;

关键词：

Sewage sludge; Cement industry; Flue gas; NOx; Denitration agent; SELECTIVE NONCATALYTIC REDUCTION; FLUIDIZED-BED; NO REDUCTION; DENO(X) PROCESS; SECONDARY FUEL; TRANSFORMATION; PYROLYSIS; BIOMASS; INCINERATION; SULFUR;

D O I：

10.1016/j.jclepro.2019.03.175

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

In this study, the feasibility of using sludge as a flue gas denitration agent for the cement industry was evaluated, and factors affecting NOx (NO + NO2) removal were systematically investigated using a custom-built laboratory-scale fluid-bed reactor. The results indicate that sludge is an effective NOx reducing agent, and sludge dosage, combustion temperature, and O-2 concentration greatly affect NOx removal. Finally, the optimal operation conditions for the sludge denitration process were determined. With a sludge dosage of 0.75 g/min, sludge particle size of 60-80 mesh, combustion temperature of 900 degrees C, gas flow rate of 18 L/min, O-2 concentration of 3% (v/v), and the CO2 concentration of 25% (v/v), the maximum NOx removal efficiency could reach 74.16 +/- 4.65%. Moreover, preliminary research on the mechanism showed the occurrence of homogeneous and heterogeneous NOx reductions during the sludge denitration process. The homogeneous NOx reduction considerably contributes to NOx removal. Therefore, the use of sewage sludge as a flue gas denitration agent for the cement industry is feasible. (C) 2019 Elsevier Ltd. All rights reserved.

引用

页码：292 / 303

页数：12

共 59 条

[1] Simulation of particles and gas flow behavior in the riser section of a circulating fluidized bed using the kinetic theory approach for the particulate phase [J].