Citation: XIAO Xiang, FANG Ping, HUANG Jian-hang, TANG Zi-jun, CHEN Xiong-bo, WU Hai-wen, CEN Chao-ping, TANG Zhi-xiong. Effect of CO₂ content on NO reduction during sewage sludge reburning[J]. Journal of Fuel Chemistry and Technology, ;2019, 47(2): 233-241. shu

Effect of CO₂ content on NO reduction during sewage sludge reburning

XIAO Xiang ^1,2 ,
FANG Ping ^1,2,, ,
HUANG Jian-hang ^1,2 ,
TANG Zi-jun ^1,2 ,
CHEN Xiong-bo ^1,2 ,
WU Hai-wen ^1,2 ,
CEN Chao-ping ^1,2 ,
TANG Zhi-xiong ^1,2

1.
South China Institute of Environmental Sciences, Ministry of Environmental Protection, Guangzhou 510655, China
2.
The Key Laboratory of Water and Air Pollution Control of Guangdong Province, Guangzhou 510655, China

Corresponding author: FANG Ping, fangping@scies.org
Received Date: 29 October 2018
Revised Date: 14 December 2018

Fund Project: the Pearl River S & T Nova Program of Guangzhou 201610010150The project was supported by the National Natural Science Foundation of China(NSFC-51778264), the Pearl River S & T Nova Program of Guangzhou (201610010150), the Youth Top-Notch Talent Special Support Program of Guangdong Province (2016TQ03Z576), the Project of Science and Technology Program of Guangdong Province(2017B020237002, 2018B020208002) and the Central-Level Nonprofit Scientific Institutes for Basic R & D Operations (PM-zx703-201803-077)the Youth Top-Notch Talent Special Support Program of Guangdong Province 2016TQ03Z576the National Natural Science Foundation of China NSFC-51778264the Project of Science and Technology Program of Guangdong Province 2018B020208002the Central-Level Nonprofit Scientific Institutes for Basic R & D Operations PM-zx703-201803-077the Project of Science and Technology Program of Guangdong Province 2017B020237002

Figures(11)

The effect of CO₂ content(volume fraction 0-35%) on the reducing gas release characteristics from sewage sludge re-burning and the dynamic properties of NO reduction by sewage sludge and char were investigated in a simulated experimental platform of cement pre-calciner. The experimental results show that the reducing gas release from sewage sludge combustion are mainly HCN, NH₃, CH₄ and CO. With the increase of CO₂ content from 0 to 25%, the release of HCN, NH₃ and CH₄ slowly decreased due to the enhancing effect of sludge gasification by CO₂, while the release of CO increased significantly, eventually promoting the NO reduction rate from 51% to 61%. As continually increasing CO₂ content to 35%, the local thermal instability was enhanced due to the radiation absorption of CO₂, and the weakening of gasification resulted in the decrease of CO release. Moreover, HCN release decreased significantly, while NH₃ release did not change much, CH₄ release increased to a certain extent, and the combined effect makes the NO reduction rate gradually decreased to 55%. The results show that sludge re-burning can efficiently reduce NO in flue gas. It is also found that the homogeneous and heterogeneous reduction of NO are concurrence during sludge re-burning, while the experimental studies revealed that the NO reduction rate over the sludge char was only 18%, it implied that sludge denitration is dominated by gas-gas homogeneous reduction.
- CO₂,
- reducing gas,
- sewage sludge,
- char,
- NO reduction
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沈阳化工大学材料科学与工程学院沈阳 110142

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Effect of CO₂ content on NO reduction during sewage sludge reburning