劣质煤配煤制备高质量冶金焦的研究
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摘要
利用劣质煤炼焦,可以扩大炼焦煤资源,降低生产成本,具有重要的战略意义和经济价值。论文以弱粘性煤和高灰煤等炼焦劣质煤为原料,采用小焦炉研究了煤沥青对弱粘性煤的改质作用以及高灰煤的成焦特性,解析了部分高灰煤具有良好成焦性的机理。在上述研究的基础上,结合原料的煤质分析、煤岩分析及焦炭的质量分析,制订了劣质煤配煤方案并在工业焦炉中进行了实验。研究结果认为,沥青与高变质煤共炭化可明显改善焦炭机械性能和热性质;富含显微矿化类型的中变质焦煤或肥煤具有良好的结焦性,因其矿物分布更分散,镜质体与矿物紧密共生,吸收较少的胶质体便能生成优质焦炭,这种赋存性状有利成焦。利用富含显微矿化类型的高灰焦煤肥煤和弱粘结贫瘦煤配煤可制备高品质冶金焦。
Coking with low-quality coals as raw material would enrich the feedstockresources for the coking industry and reduce the cost, which have important strategicand economic values. Several kinds of coals in different ranks and coal tar pitch werecarbonized in a40kg coke oven. Based on the analyses of coal quality, petrographiccompositions and coke properties, the relations between optical microscopic textureof coke and coal rank, and the effect of pitch on the coking properties duringco-carbonization were investigated repectively. The coking mechanism andoptimization of blending ratio among high ash coals were studied. The results showthat co-carbonization of pitch and high-rank coals would improve the mechanical andthermal properties of coke significantly. The inherent minerals in fat coal&cokingcoal rich in carbominerite were distributing evenly and in intimate contactwithvitrinite. Therefore, high-quality cokes could be obtained even less metaplast waspresent during the coking process. It could be basically concluded that high-ashcoking coal and fat coal rich in carbominerite can be blended with low cohesivemeager lean coal for high-quality coke production, which has been demonstrated byindustrial experiments.
引文
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