ABSTRACT

It is an effective way to utilize low-rank coal to obtain Hyper-coal by thermal extraction. Taking Shanxi lignite as raw material, the Hyper-coal was obtained by extraction at several temperatures. The basis of Hyper-coal as an excellent upgrading binder for coking was comprehensively studied from two aspects of macrocohesion index and microstructure. The experimental results show that the content of ash and sulfur in the Hyper-coal is low, and the content of light components is increasing with the increase of extraction temperature. The thermoplasticity of hyper-coal is generally high, the fluidity of colloid formed by pyrolysis is higher than that of conventional coking coal, and the bonding ability also reaches the level of fat coal. The source of high thermoplasticity of hyper-coal mainly depends on its microstructure, such as high aliphatic hydrocarbon content and wide thin compact carbon network structure. The optimum extraction temperature was 380°C. Generally speaking, Hyper-coal can be used as an excellent binder for coking.

摘要

热提法是利用低阶煤制取超煤的有效途径。以山西褐煤为原料，经不同温度提取得到超煤。从宏观凝聚指数和微观结构两个方面对超煤作为焦化优良提质粘结剂的基础进行了综合研究。实验结果表明，超煤中灰分和硫含量较低，轻组分含量随提取温度的升高而增加。超煤的热塑性普遍较高，热解形成的胶体流动性高于常规炼焦煤，粘结能力也达到肥煤的水平。超煤的高热塑性来源主要取决于其微观结构，如高脂肪烃含量和宽薄致密的碳网络结构。最佳提取温度为380℃。一般来说，超煤可作为焦化的优良粘结剂。