热溶煤的结焦特性研究

Research on coking properties of thermal dissolved coals

将低阶煤转化为焦炭,实现资源的有效利用,有利于降低钢铁行业的运行成本。文章采用热溶解方式将低阶煤转化为热溶煤,并对热溶煤的焦化性能进行了研究。结果表明:热溶煤的焦化性能明显优于原煤。KL、GD、XB和ZS热溶煤的黏结性指数G分别为98、97、95和89,较原煤显著提高。采用最大渗透距离法测定热溶煤的流动性,四种热溶煤的最大渗透距离均显著提高,流动性增强。在GD原煤中配入不同含量的KL和ZS热溶煤,其焦炭强度均有一定程度的增强,但加入量有上限限制,其中KL热溶煤含量在20%时强度达到最大值5. 74 MPa,ZS热溶煤含量在25%时强度达到最大值7. 01 MPa。

The coking property of thermal dissolved coals were better than that of raw coals. The caking index G of KL,GD,XB and ZS thermal dissolved coal were 98,97,95 and 89 respectively,increased significantly compared with the raw coal. The maximum permeation distance method were applied to measure the fluidity,and the permeation distance of four kinds of thermal dissolved coals were significantly improved,indicating the fluidity were enhanced. The coke experiment demonstrates that the strength of coke with proper thermal dissolved coals would enhance,and max strength is obtained with percentage of 20% for the KL thermal dissolved coal and 25% for thermal dissolved coal,whose strength is 5. 74 MPa and 7. 01 MPa respectively.