Effect of Pr-TiO2 on NOx Emissions during Coal Combustion

被引：0
作者：
Wang, Shuqin [1 ]
Cao, Shuai [1 ]
Liu, Lifeng [1 ]
Cheng, Weiliang [2 ]
机构：
[1] Department of Environmental Science and Engineering, North China Electric Power University, Baoding
[2] Department of Energy，Power and Mechanical Engineering, North China Electric Power University, Beijing
来源：
Zhongguo Xitu Xuebao/Journal of the Chinese Rare Earth Society | 2024年 / 42卷 / 05期
关键词：
biomass; calcium acetate; co-firing; NO[!sub]x[!/sub] emission reduction mechanism; Pr-modified TiO[!sub]2[!/sub;
D O I：
10.11785/S1000-4343.20240513
中图分类号：
学科分类号：
摘要：
This paper states the modification of TiO2 by Pr and the subsequent application in denitrification in combustion.Pr-TiO2 with different doping ratios was prepared by microwave-assisted sol-gel method. Compared with TiO2，the particle size of Pr-TiO2 decreases，the specific surface area increases，the anatase type content increases，and the catalytic activity is enhanced. Later，the effect of Pr-TiO2 on denitrification when coal is blended with biomass was investigated，and the combustion experiment optimized the optimal experimental conditions as rice straw+calcium acetate（Ca/S=2.3）+Pr-TiO2（2%）. The experimental results show that the additives are well adapted to single and blended coals with low volatile matter and medium to high sulfur，and the denitrification efficiency is up to 92.2%. Meanwhile，rice straw and Pr-TiO2 can lower the ignition point of coal，promote combustion and reduce the degree of coal ash caking. The mechanism analysis suggests that the additives promote denitrification can be divided into two parts：the first is the homogeneous reaction，where the additives promote the conversion of N-5 and N-6 to N-Q in coal，which promotes the reduction of NH3 to NO；the mixture pyrolysis produces reducing gases such as CnHm，which competes with NOx intermediate HCN for O2 and reduces NOx generation while reducing NO to N2；the second is the heterogeneous reaction，where the addition of additives enhances the active site of coal coke and promotes the heterogeneous reduction of NO by coal coke；it increases the amorphous and defective structure of coal coke carbon structure and enhances the adsorption activity，and the NOx removal rate can be improved. © 2024 Editorial Office of Chinese Rare Earths. All rights reserved.
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页码：935 / 946
页数：11
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