Experimental study on ammonia adsorption by coal ashes

被引：0

作者：

Zhao, Yun-Long ^{[1
]}

Yang, Wei-Juan ^{[1
]}

Zhou, Jun-Hu ^{[1
]}

Wang, Zhi-Hua ^{[1
]}

Liu, Jian-Zhong ^{[1
]}

Cen, Ke-Fa ^{[1
]}

机构：

[1] State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou

来源：

Ranliao Huaxue Xuebao/Journal of Fuel Chemistry and Technology | 2015年 / 43卷 / 03期

关键词：

Adsorption; Ammonia; Coal ash; NO[!sub]x[!/sub] control; SCR; SNCR;

D O I：

10.1016/s1872-5813(15)30006-2

中图分类号：

学科分类号：

摘要：

Unreacted ammonia in Selective Catalytic Reduction (SCR) and Selective Non-catalytic Reduction (SNCR) technology may be adsorbed by fly ash and lead to ash blocking in the air preheater or hindering the secondary utilization of ash. Ammonia adsorption by fly ash may have a close relationship to the concentration of ammonia in flue gas. Regarding Ximeng lignite and Yangquan anthracite as the subjects investigated, NH3 Temperature-programmed Desorption (NH3-TPD) was utilized to study the relationship between ammonia chemical adsorption and mineral composition of the ash, the atmosphere of ash production, cooling rate of ash as well as the amount of residual carbon in the ash. The results show that rapid cooling and reduction atmosphere could increase the amount of amorphous phase in the ash and facilitate ammonia adsorption. On the other hand, ash with residual carbon could adsorb more ammonia than mineral ash as a result of acidic functional group on the surface of residual carbon. ©, 2015, Ranliao Huaxue Xuebao/Journal of Fuel Chemistry and Technology. All right reserved.

引用

页码：266 / 272

页数：6

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