Abstract

The improvement of vitrinite content in low-rank coal can enhance liquefaction efficiency. In this work, an innovative rotary triboelectric separator (RTS) was used to enrich the macerals of low-rank coal. The effects of friction wheel speed (A), separation voltage (B), and feed rate (C) of RTS on the macerals enrichment were investigated, and the interactions of the three factors were explored via the response surface method. By the established model, all the three factors have significant effects on the vitrinite recovery R_v, and the interaction between AC is stronger than AB and BC. Taking the maximum value of R_v as the optimization target, the optimal prediction index was obtained and validated based on laboratory experiments. Under the optimum operating conditions, a maximum R_v value of 74.48% was achieved at a friction wheel speed of 3220.14 rpm, a separation voltage of 30.18 kV, and a feed rate of 1.44 g/s. The average vitrinite content and R_v of the verification experiments were 65.45% and 74.71%, respectively.

摘要

低阶煤中镜质体含量的提高可以提高液化效率。在这项工作中，一种创新的旋转摩擦电分离器 (RTS) 被用于富集低阶煤的矿物。研究了摩擦轮转速(A)、分离电压(B)和RTS进料速率(C)对微晶富集的影响，并通过响应面法探讨了三因素的相互作用。由所建立的模型可知，三个因素对镜质体恢复率R _v均具有显着影响，且AC之间的交互作用强于AB和BC。取R _v的最大值作为优化目标，通过实验室实验获得并验证了最优预测指标。在最佳操作条件下，当摩擦轮转速为 3220.14 rpm、分离电压为 30.18 kV、进料速率为 1.44 g/s 时，最大R _{v值为 74.48%。}验证实验的平均镜质体含量和R _v分别为65.45%和74.71%。