炼焦单种煤最佳粉碎粒度研究

Study on optimum grinding particle size of single coking coal

为研究炼焦煤在不同粒度下的性质,对肥煤、1/3焦煤、焦煤、贫瘦煤进行了不同筛分粒级的煤岩显微组分及煤质分析,进行了单种煤在不同粉碎粒度下的坩埚焦实验,分析了粒度对焦炭冷热态强度的影响。筛分结果表明:随筛分粒级的减小,镜质组含量增加,惰质组含量减少;灰分主要集中在-1 mm的细粒部分与+10 mm的粗粒部分,硫分主要集中在-1 mm的细粒部分,粒度对煤挥发分影响不大,黏结指数在1～5 mm时优于其它粒级。坩埚焦实验表明:肥煤、1/3焦煤、焦煤等强黏结性煤粉碎到1 mm以下时,热态性能劣化;贫瘦煤配入量多时,细粉碎后没有足够的活性物质包裹惰性组分,焦炭强度急剧下降。

To study the properties of coking coal in different granularity,analyse maceral and coal properties of different screening particle fractions on fat coal,1/3 coking coal,coking coal and meager lean coal.Carry out crucible coke experiments about different grinding granularity of single coal,also analyse influence of granularity on cold and hot strength of coke.The results show that,the vitrinite content increase and the inertinite content decrease with the decrease of the decrease of screening size.Ash content is mainly concentrated in the fines（particles are smaller than 1 mm） and coarse-grained fraction（particles are bigger than 10 mm）,sulfur content is mainly concentrated in the fine-grained fraction（particles are smaller than 1 mm）,granularity has little impact on volatile.It is better than others when the caking index within 1 mm to 5 mm grain size.Crucible coke experiment results show that,the hot strength of fat coal,1/3 coking coal,coking coal and such strong caking coal decrease when the granularity is less than 1 mm.Once the meager lean coal blended too much,there will be not enough active substance to wrap the inert components after the coal was finely grinded,this would cause a sharp decline on coke strength.