原煤风选系统优化改造

Transformation of raw coal pneumatic cleaning system

通过分析华夏公司原煤风选系统工艺流程,说明主要存在风选机处理能力不足、分选效果差、风选块煤含矸量大等问题。阐述了FGX-6型风选机的结构和工作原理,说明原煤外水分、原煤粒度、原煤可选性和含矸量、风选机操作条件是影响风选机分选效果的主要因素。根据华夏公司原煤性质,结合现场空间和布局,最终确定改造措施为:在一次筛分车间增加二次筛分,筛网孔径为13 mm;增加两条输送带使筛后产品输送更加灵活;将一次筛分的筛网孔径由100 mm扩大到150 mm;对风选系统通风管路、筛孔筛面等处的堵塞杂物进行清理,根据入选原煤粒级重新调整风选系统工作参数。改造后,风选系统运行良好,分选效果明显改善,杜绝了原煤直接落地低价销售的情况,提高了产品发热量,减少了矸中带煤量,经济效益显著。

The analysis of raw coal pneumatic cleaning system of Huaxia company show that, the handing capacity and effects of pneumatic concentrator is poor and large quantity of gangue mix with lump coal. Introduce the structure and working principle of FGX-6 pneumatic concentrator, find that its main influencing factors are free moisture, size, washability, gangue content and working conditions. Based on the raw coal properties, space and layout of company, determine the reformation measures. Add the secondary screening process in the primary screening workshop,the aperture size is 13 mm. Install two conveyor belts which make products conveying more flexible. Enlarge the aperture size of the primary sieve from 100 mm to 150 mm. Thoroughly clean the blockage in vent lines, sieve aperture and surface of pneumatic concentrator. Adjust the working parameters of pneumatic cleaning system according to the raw coal size. After transformation, the pneumatic cleaning system works well, the calorific value of products and raw coal sales prices increase, the gangue in lump coal decrease.