原煤性质对跳汰机工作参数的影响Influence of raw coal properties on jig working parameters
陈建平,王敏,马甜甜,葛海波,张维军,许文波
CHEN Jianping,WANG Min,MA Tiantian,GE Haibo,ZHANG Weijun,XU Wenbo
摘要(Abstract)：
针对济三选煤厂跳汰工艺无法满足原煤分选要求,分选精度和数量效率明显下降,精煤质量不稳定,精煤产率低等问题,对原煤进行筛分试验和小浮沉试验,说明原生煤泥含量较低为7.30%,中煤含量偏高为20.17%,原煤可选性为难选。分析了原煤粒度、水分、矸石量和中煤斗式提升机排放物对跳汰机工作参数的影响,结果表明:块煤量小时,应将跳汰机入选量降至最低,减小用风,增大频率,减小排气;块煤量多时,应采取大水小风的操作方法,增加水量,加快床层水平运动速度,增加中煤排放,减少用风量。原煤水分较高时,应增加给煤量8%~15%。矸石增多时,应降低一段床层厚度,增大一段碎矸透筛,减轻中煤段压力。中煤斗式提升机内块煤量大时,应增加二段床层厚度,减少二段排料和二段用风量;中煤斗式提升机内有较大颗粒矸石时,应减少带煤量,增大二段排料,加大二段用风,降低二段床层厚度。
The problems with the jigging process were that,the raw coal can't be separated effectively,separation precision and recovery efficiency decreased markedly,the quality of clean coal was unstable and its yield was low. Conducted screen analysis and small size slurry float-and-sink analysis. The results show that,the primary slime content is 7. 30%,the middlings content is 20. 17%,so the raw coal is difficult to separate.Analyze the influence of raw coal size,moisture,gangue content,emissions of elevator on jig working parameters. When the lump coal is less,the separation capacity of jig should be reduced to a minimum,meanwhile,reduce the air volume and emissions,increase the frequency. When the lump coal is large,the water content,horizontal kinematic velocity of bed and middlings discharging should be increased,the air volume should be decreased. When the moisture of raw coal is high,the feeding coal should be increased by 8% to 15%. If the gangue content increased,lowering the height of first-stage bed and increasing the screening efficiency of first-stage lighten the handing capacity of middlings treating process. If the lump coal in bucket type elevator were large,the thickness of second-stage bed should be increased,the discharging and air emission of second-stage should be decreased. If there were larger gangue in bucket type elevator,the feeding coal and the second-stage height of the second-stage should be decreased,gangue discharging and air volume should be increased.
关键词(KeyWords)：
煤质;跳汰机;工作参数;床层;粒度;水分
coal property;jig;working parameter;bed;size;moisture
基金项目(Foundation):
作者(Author):
陈建平,王敏,马甜甜,葛海波,张维军,许文波
CHEN Jianping,WANG Min,MA Tiantian,GE Haibo,ZHANG Weijun,XU Wenbo
DOI: 10.13226/j.issn.1006-6772.2014.05.015