李家壕选煤厂提高产品发热量的措施

为提高李家壕选煤厂产品发热量,分析了原煤性质,说明原煤属低灰~中灰、低硫~中硫、特低磷、中高发热量的不黏煤和长焰煤;原生煤泥中混入较多矸石,且矸石易泥化,分选时应尽可能减少煤和矸石与水的接触时间;次生煤泥灰分极高为74.23%,矸石破碎泥化现象严重,主要集中在-0.045 mm细煤泥中。通过提高选煤厂管理水平,改造过煤溜槽,增设外来煤系统、细煤泥外排系统和矸石直接外排系统等措施对选煤厂进行改造。改造后选煤厂管理水平不断提高,原煤水分大幅降低,平均降低3%左右;外来优质煤的掺混使原煤仓、产品仓和过煤溜槽的黏堵情况得到改善,细煤泥快速回收;块精煤和混末煤产品的发热量明显提高,每年增加利润近3000万元。

Improvement of products calorific value in Lijiahao coal preparation plant

The analysis of raw coal supplied to Lijiahao coal preparation plant show that,it＆#39;s low-medium ash and sulfur,extra low phos-phorus,high calorific value non-caking coal and long flame coal.There are lots of gangue in raw slime and the gangue is easy to degrade, so it needs to minimize the contact time between coal, gangue and water during separation. The ash of secondary slime is 74. 23%, the gangue degrade seriously and mainly exist in -0.045 mm fine slime.Transform the coal preparation plant by improving management,refor-ming coal handing equipments, adding supplement coal system, fine slime and gangue discharging systems. After transformation, the raw coal moisture reduces by an average of 3%,the supplement of high-quality coal can improve the coal delivery situation in raw coal bunker, products bunker and coal handing equipments.The fine slime can be recycled rapidly,the calorific value of lump clean coal and mixed slack coal can be improved obviously,the coal preparation plant increases profits 3＆#215;107 yuan per year.