龙山选煤厂提高块煤产率的方法

摘要

In order to increase the lump coal yield in Longshan coal preparation plant,analyze the raw coal properties.The results show that,the raw coal is medium and high ash,extra low sulfur No.2 anthracite.There is less primary slime and the gangue is harder which is difficult to crush and grind.There is obvious degradation phenomenon.When lump coal ash is above 12%,the raw coal is easy to wash.The analysis of the process flow of coal preparation plant show that,low screening efficiency,frequent collision and high drop distance lead to low lump coal yield.To resolve these problems,replace the drum screen with linear vibrating screen,the raw coal bunker or lump coal point install spiral chute and take other measures to reduce coal breakage.After transformation,the lump coal yield increase by 1. 74%,the medi-um-sized lump coal increase by 0.51%,the small lump coal increase by 1.23%,the plant creates benefits 2.3868×106 yuan per year.%为提高龙山选煤厂块煤产率，分析了原煤性质，说明原煤属中高灰、特低硫的2号无烟煤；原生煤泥较少，矸石较硬，不易破碎解离，有明显泥化现象；块精煤灰分大于12％时，原煤可选性为易选。通过分析选煤厂工艺流程，说明滚筒筛筛分效率低，产品运输转载过程中碰撞溜槽，块煤入仓时摔碎，块煤落煤点较高等是造成选煤厂块煤产率低的主要原因。通过将滚筒筛更换为直线振动筛，在胶带机落煤溜槽内增加防破碎装置或缓冲闸板，在原煤仓内或块煤落煤点安装螺旋溜槽等措施减少块煤破碎。改造后选煤厂块煤产率提高了1.74％，其中精中块提高0.51％，精小块提高1.23％，每年增加经济效益238.68万元。