Coal char particle secondary fragmentation in an entrained-flow coal-water slurry gasifier
Coal char particle secondary fragmentation in an entrained-flow coal-water slurry gasifier
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DOI：
10.1016/j.joei.2018.04.001
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发表时间：
2019-06-01
影响因子：
5.7
通讯作者：
Wang, Fuchen
中科院分区：
文献类型：
--
作者：
Guo, Qinghua;Zhang, Zhiqing;Wang, Fuchen
气化炉中的煤焦颗粒尺寸对碳转化率、气化炉造渣以及粗合成气中的颗粒物含量有影响。小型对置多燃烧器（OMB）气化炉中的颗粒尺寸分布表明，气流床气化炉中颗粒从高温冲击火焰区域移动到气化室出口区域后存在二次破碎行为。撞击火焰区域中大于200μm的颗粒具有形状脆弱的孔隙结构。不同氧碳比（O/C）下的粒径分布也表明，当粒径大于200μm时，存在明显的破碎现象。只要煤焦颗粒从冲击火焰区域向气化室出口区域移动，由于渗透破碎、经历气化反应和热应力，就可能发生二次破碎。但根据简化数学模型计算，热应力破碎仅对大于350μm的粒径有影响。 (C) 2018 年能源研究所。由爱思唯尔有限公司出版。保留所有权利。
Coal char particle size in the gasifier has an influence on the carbon conversion, gasifier slagging as well as the particle matter content in raw syngas. The particle size distribution in a bench-scale opposed multi-burner (OMB) gasifier illustrated that the secondary fragmentation behavior exists in the entrained-flow gasifier after the particles moving from high temperature impinging flame region to the gasification chamber outlet region. Particles larger than 200 mu m in the impinging flame region have porosity structures with fragile shapes. Particle size distributions under different oxygen to carbon ratios (O/C) also indicate that there is an obvious fragmentation while the particle size is larger than 200 mu m. As long as the coal char particles move from the impinging flame region towards the gasification chamber outlet region, the secondary fragmentation is probably taken place as a result of percolative fragmentation, undergoing gasification reactions and thermal stress. However, thermal stress fragmentation only has an influence on the particle sizes larger than 350 mu m according to the calculation by a simplified mathematical model. (C) 2018 Energy Institute. Published by Elsevier Ltd. All rights reserved.