Effect of Volatile−Char Interaction on the NO Emission from Coal Combustion
详细信息 查看全文
- 作者：Mingyu Yao ; Defu Che ; Yanhua Liu ; Yinhe Liu
- 刊名：Environmental Science & Technology
- 出版年：2008
- 出版时间：July 1, 2008
- 年：2008
- 卷：42
- 期：13
- 页码：4771 - 4776
- 全文大小：480K
- 年卷期：v.42,no.13(July 1, 2008)
- ISSN：1520-5851
文摘
To clarify the effects of volatile−char interaction on the redistribution of fuel-N to N2 during devolatilization and the reduction of NO through gas−solid reactions during combustion, two types of experiments were performed on a novel reactor. The separate combustion of volatile and char and the combustion of entrained pulverized coal, and the formation of NO was examined between 800 and 1100 °C by using four typical Chinese coals with different ranks. The effect of volatile−char interaction on fuel-N conversion to NO during combustion was elucidated through comparing the NO emissions from the two types of combustion experiments. The results show that the volatile−char interaction is more important in the redistribution of fuel-N to N2 during devolatilization than in the reduction of NO over 900 °C, and a contrary conclusion is obtained below 850 °C for all used coals. A specific parameter has been proposed to characterize the relative importance of the volatile−char interaction in the redistribution of fuel-N to N2 during devolatilization to the interaction in the reduction of NO to N2 during simulataneous combustion of volatile and char. The results are of significance for minimizing the NO formation in industrial combustion processes.