Study on the coal rock microstructure separation of low-rank coal in enhanced gravity field

摘要

Low-rank coal has large reserves in China, it has the characteristics of low ash, low sulfur, high volatile, highly hydrogen content and good chemical reactivity. So the low-rank coal is extremely suitable for liquefaction. The vitrinite group of coal is the active component for liquefaction. The larger the proportion of the vitrinite group, the higher the yield of the product oil after liquefaction. In this paper, vitrinite group content of concentrates can be significantly increased by using enhanced gravity. In this experiment, Shenhua low-rank coal was invoked as the raw coal and the enhanced gravity field was supported by Falcon centrifugal separator. After the enrichment of raw coal, the content of vitrinite in the vitrinite-rich concentrates was increased by 10-30% compared with the raw coal, and the content of the inertinite in the inertinite -rich concentrates was increased by 10-25% compared with the raw coal. The results of the experiments were fitted by Quadratic model, the vitrinite group recovery rate of concentrates was up to 71.30%, and the vitrinite group enrichment ratio could be 1.17.