风力干法分离细粒煤粉的研究

Separation of coal fines with dry-type pneumatic separator

动力煤选煤厂细煤泥一般不分选,细煤泥经过压滤脱水后煤泥产品水分高,煤泥综合利用难度大,市场竞争力不强。为了降低煤泥水分,提高发热量,减小煤泥水系统负荷,提出风力干法分离细粒煤粉,干燥粉煤回掺以降低煤泥水分的方法。从理论上介绍风力干法分离的基本原理和可行性,给出基本流程,结合流程分析部分细颗粒不进入主选系统的优点。对分离室内处于理想状态下的单个细颗粒煤粉进行受力分析,计算分离室内主要的分离参数。初步效益估算表明:风力干法分离细粒煤粉具有很高的社会效益和经济价值,前景广泛,值得进一步研究推广。

The most common method of treating fine slime is pressure filtration without separation,so the slime products with high moisture need further treatment.To reduce moisture of fine slime,improve its calorific value,lighten the load of coal slurry preparation system,provide the dry-type pneumatic separation method.Introduce its principles and feasibility theoretically.Analyse the basic processes,find that this method can avoid part of fine slime into primary cleaning system.Setting the separating room as ideal condition,carry out force analysis of single coal powder granule,calculate the main separating parameters in separation room.Primary benefits estimation indicate that,dry-type pneumatic separator for coal fines worth further promotion due to its considerable social and economic benefits.