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Investigation on the catalytic effects of AAEM during steam gasification and the resultant char reactivity in oxygen using Shengli lignite at different forms

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International Journal of Coal Science & Technology 2015年第3期2卷 223-231页

作者： Jianxin Mi Ningbo Wang Mingfeng Wang Pengju Huo Dan Liu Hydrocarbon Research Center of Shaanxi YanchangPetroleum (Group) Co. Ltd. Xi'an 710075 China

The purpose of this study is to investigate the catalytic effects of alkali and alkaline earth metallic species （AAEM） on char conversion during the gasification in steam and the changes in ex-situ char reactivity in oxygen after the gasification in steam using different forms （i.e. H-form, Na-form） of Shengli brown coal. The surface area, AAEM concentration and carbon crystallite of chars were obtained to understand the change in char reactivity. It was found that not only Na concentration and carbon structure were the main factors governing the char reactivity in the atmosphere of steam and oxygen, but also they interacted each other. The presence of Na could facilitate the formation of disordering carbon structure in char, and the amorphous carbon structure would in turn affect the distribution of Na and thus its catalytic performance. The surface area and pore volume had very little relationship with the char＇s reactivity. Addi- tionally, the morphology of chars from different forms of coals were observed using scanning electron microscope （SEM）.

关键词： Steam gasification H-form coal Na-form coal char reactivity char structure

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Changes in char reactivity due to char-oxygen and char-steam reactions using Victorian brown coal in a fixed-bed reactor

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Chinese Journal of Chemical Engineering 2015年第1期23卷 321-325页

作者：张书 Yonggang Luo Chunzhu Li 王永刚 Department of Chemical Engineering Monash University School of Chemical and Environmental Engineering China University of Mining and Technology Fuels and Energy Technology Institute Curtin University of Technology

This study was to examine the influence of reactions of char–O2and char–steam on the char reactivity evolution.A newly-designed fixed-bed reactor was used to conduct gasification experiments using Victorian brown coal at800 °C. The chars prepared from the gasification experiments were then collected and subjected to reactivity characterisation(ex-situ reactivity) using TGA(thermogravimetric analyser) in air. The results indicate that the char reactivity from TGA was generally high when the char experienced intensive gasification reactions in 0.3%O2in the fixed-bed reactor. The addition of steam into the gasification not only enhanced the char conversion significantly but also reduced the char reactivity dramatically. The curve shapes of the char reactivity with involvement of steam were very different from that with O2 gasification, implying the importance of gasifying agents to char properties.

关键词： Brown coal Gasifying agent char reactivity Fixed-bed reactor

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Combustion and NO_x Emission Behavior of Chinese Coals

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Chinese Journal of Chemical Engineering 2002年第3期10卷 333-338页

作者：陈宏刚谢克昌 Taiyuan University of Technology State Key Laboratory of C1 Chemistry and Technology Taiyuan 030024

Seven Chinese coals ranking from anthracite to sub-bituminous fromthe Shanxi province were selected for study to forecast thecombustion and NO_x emission behavior. Three UK, one Indonesia andone South Africa coal was included in the study for reference. A flatflame-turbulent jet apparatus was employed to assess flame stability,ignition performance and NO_x emission behavior for the initial stageof devolatilization and combustion. This apparatus can simulateparticle heating rates, maximum temperatures and the influence of theturbulent Fluid interactions on the fate of volatiles.

关键词： devolatilization char reactivity slagging NO_x

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