Effect of Fe on NO release during char combustion in air and O<sub>2</sub>/CO<sub>2

doi:10.1007/s11708-012-0181-2

Front Energ

2012, Vol. 6

Issue (2) : 200-206 https://doi.org/10.1007/s11708-012-0181-2

RESEARCH ARTICLE

Effect of Fe on NO release during char combustion in air and O₂/CO₂

Ying GU, Xiaowei LIU(

), Bo ZHAO, Minghou XU

State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology, Wuhan 430074, China

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Abstract

The chemistry of char was probed by studying nitrogen release under the reactions with air and oxy-fuel combustion. The experiments were conducted in a drop tube furnace and a fixed bed flow reactor. NO was observed during those experiments. The results show that the particle size of char generated at 1073 K in CO₂ is larger than that in N₂. However, at 1573 K, it is smaller in CO₂ atmosphere due to particle breaking by gasification of char and CO₂. The Fe addition increases the NO conversion ratio, and the effect of Fe rises steeply with the process going until it becomes stable in the end. The results also indicate that the release of NO increases more significantly with the Fe addition in oxy-fuel environment.

Keywords NO Fe char combustion CO₂

Corresponding Author(s): LIU Xiaowei,Email:xwliu@hust.edu.cn

Issue Date: 05 June 2012

Cite this article:

Ying GU,Xiaowei LIU,Bo ZHAO, et al. Effect of Fe on NO release during char combustion in air and O₂/CO_{2[J]. Front Energ,
2012, 6(2): 200-206.}

URL:

https://academic.hep.com.cn/fie/EN/10.1007/s11708-012-0181-2
https://academic.hep.com.cn/fie/EN/Y2012/V6/I2/200

Tab.1 Proximate and ultimate analysis of coal samples

Tab.2 BET surface area at different temperatures

Tab.3 Pore volume of chars at different temperatures

Tab.4 Nitrogen in char at different temperatures

Fig.1 Size of char at different temperatures

Fig.2 NO release in char* combustion (*Char was generated in Ar at 1073 K)

Fig.3 NO release in char* combustion (*Char was generated in CO at 1073 K)

Fig.4 NO release in char* combustion (*Char was generated in Ar at 1573 K)

Fig.5 NO release in char* combustion (*Char was generated in CO at 1573 K)

Fig.6 Effect of Fe on NO in char* combustion (*Char was generated in Ar at 1073 K)

Fig.7 Effect of Fe on NO in char* combustion (*Char was generated in CO at 1073 K)

Fig.8 Effect of Fe on NO in char* combustion (*Char was generated in Ar at 1273 K)

Fig.9 Effect of Fe on NO in char* combustion (*Char was generated in CO at 1273 K)

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