强化重力场下低阶烟煤煤岩显微组分分离

发布时间：2018-05-22 20:28

本文选题：煤岩显微组分 + Falcon离心分选　；参考：《中国矿业大学》2017年硕士论文

【摘要】：煤岩显微组分是煤的微观组分,实现煤岩显微组分富集可以有效提高煤制油转化效率,提高配煤炼焦效率,有助于制作优秀水煤浆。本文是采用Falcon离心分选机探究强化重力场中煤岩显微组分富集的最佳效果。试验煤样的灰分为9.57%,挥发分为37.40%,为长焰煤。煤中镜质组含量为48.64%,惰质组为44.07%,壳质组为0.86%,矿物质为6.43%。首先要研究强化重力场下煤岩显微组分的最佳解离粒度。将试验煤样解离到不同粒度,通过对煤样做筛分试验、浮沉试验以及Falcon分选试验,发现当解离粒度为-0.25mm时,试验煤样的灰分、镜质组含量、镜质组回收率和惰质组脱除率的效果均最好,确定了强化重力场中煤岩显微组分富集的最佳解离粒度为-0.25mm。将试验煤样解离到0.25mm以下,对强化重力场中分离煤岩显微组分最佳工艺参数进行研究。通过转动频率和反冲水压的单因素探索试验,得到了各单因素较好的取值区间,确定了Falcon正交试验的因素水平。采用Design-Expert软件对Falcon正交试验进行设计和分析,对可燃体回收率、脱灰率、镜质组回收率和惰质组脱除率均使用二次方模型进行数据分析,分析结果显示反冲水压对各项指标的影响均要大于转动频率对各项指标的影响。对正交试验进行优化,优化目标优先级为脱灰率=惰质组脱除率可燃体回收率=镜质组回收率,对可燃体回收率和镜质组回收率的最大值进行限制。对灰分取最小值,对其他五个评价指标均取最大值,得到的优化结果为转动频率55Hz、反冲水压0.03MPa,此时各项指标结果分别为:灰分4.69%、镜质组含量67.50%、可燃体回收率34.09%、脱灰率82.96%、镜质组回收率40.80%、惰质组脱除率76.62%。此时,在保证镜质组富集物中镜质组含量的情况下依然可以保证镜质组富集物的产率。
[Abstract]:Coal and rock macerals are microscopic components of coal. The enrichment of coal and rock macerals can effectively improve the conversion efficiency of coal to oil and the coking efficiency of coal blending, which is helpful to the making of excellent coal water slurry. In this paper, Falcon centrifugal separator is used to explore the best effect of enhancing the enrichment of coal and rock macerals in gravity field. The ash of the test coal sample is 9.57 and the volatile content is 37.40%, which is long flame coal. The content of vitrinite in coal is 48.64%, in inertinite is 44.07, in chitin is 0.86, and in mineral content is 6.43. First, the optimum dissociation granularity of coal and rock macerals under enhanced gravity field should be studied. The test coal sample was dissociated to different granularity. Through sieving test, floatation test and Falcon sorting test, it was found that the ash content and vitrinite content of coal sample were tested when the dissociation granularity was -0.25mm. The vitrinite recovery rate and the inertinite removal rate are the best. The optimum separation granularity of the enrichment of coal and rock macerals in the enhanced gravity field is -0.25mm. The experimental coal samples were dissociated below 0.25mm to study the optimum technological parameters for separation of coal and rock macerals in the enhanced gravity field. Through the single factor exploration test of rotation frequency and recoil water pressure, the better value interval of each single factor was obtained, and the factor level of Falcon orthogonal test was determined. The orthogonal test of Falcon was designed and analyzed by Design-Expert software. The recovery rate of combustible body, ash removal rate, vitrinite recovery rate and inert group removal rate were all analyzed by quadratic model. The results show that the impact of recoil pressure on each index is greater than that of rotation frequency. The optimization of orthogonal experiment shows that the priority of the optimization is removal rate of ash = removal rate of inertinite group. The maximum recoveries of combustible body and vitrinite group are limited to the combustible body recovery rate and vitrinite group recovery rate. The minimum value of ash content and the maximum value of the other five evaluation indexes, The optimized results are as follows: rotation frequency 55 Hz, recoil water pressure 0.03 MPA. The results are as follows: ash 4.69, vitrinite 67.50, combustible body recovery 34.09, ash removal 82.96, vitrinite 40.80 and inertinite 76.62. At this time, the vitrinite concentration in vitrinite can still ensure the yield of vitrinite enrichment.
【学位授予单位】：中国矿业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TD94

【参考文献】