Analysis on Influence Factors of the Characteristic of Pore Structure During Combustion of Oil Shale Semi-coke
Analysis on Influence Factors of the Characteristic of Pore Structure During Combustion of Oil Shale Semi-coke
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发表时间：
2008
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通讯作者：
Li Shao-hua
中科院分区：
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作者：
Li Shao-hua
以桦甸油页岩和汪清油页岩为原料，在小型流化床反应器上进行了半焦燃烧试验。在不同的燃烧条件下获得灰样。在氮气气氛下，用Micromeritics Gemini 2380比表面积分析仪测定吸附等温线。根据BJH理论确定了样品的孔径分布。考察了不同半焦、床层温度、半焦粒度、表观流化速度和半焦投料量等因素对灰孔结构的影响。结果表明，半焦的孔结构已经很发达，在燃烧过程中，燃料的总孔体积逐渐减小。不同半焦的孔径分布存在明显差异。床层温度低有利于多孔结构的形成。投料量对灰孔结构的形成过程有影响，但不会改变灰的最终孔结构。流化速度越高、颗粒粒径越小，孔隙破坏越严重。
Combustion experiments with semi-coke of Huadian and Wangqing oil shale were conducted in a bench-scale FBC reactor. Ash samples were obtained under different combustion conditions. Adsorption isotherms were determined by Micromeritics Gemini 2380 specific area analyzer under nitrogen atmosphere. The pore size distribution of samples was determined on the basis of BJH theory. Influence factors on pore structure of ash, such as different semi-coke, bed temperature, particle size, apparent fluidized velocity and batch feeding quantity of the above-mentioned semi-coke were investigated. The result shows that pore structure of semi-coke was already well developed and the total porous volume of the fuel decreased gradually during combustion. The pore size distribution of different semi-coke presents obvious difference. Low bed temperature favors the formation of porous structure. Batch feeding quantity has effect on the process of porous structure,but couldn’t change the ultimate ash pore structure. Higher fluidized velocity and smaller particle size lead to more pores destroyed.