摘要
为有效预测原煤干选指标,实现分选影响参数的量化模拟,研究了粒度上下限和全粒级分选密度对各粒级实际分选密度δ和可能偏差Ep的影响,并建立了数学模型,对山西兴县金地煤业南窑煤矿原煤进行干法分选试验,验证数学模型的准确性。结果表明,随着各粒级平均粒度变小,实际分选密度增加,细粒煤分选效果显著变差。各粒级分选密度偏差δi-δ与各粒级几何平均粒度Di的相关系数(R2)为0.91,各子粒级分选可能偏差Ep值和各分选密度δi的比值与分选入料几何平均粒度Di的相关系数(R2)为0.78。半工业试验实际分选结果与数学模型预测重复度较好。分选密度高于1.80 g/cm3,精煤灰分大于24%时,分选效率比较稳定,理论精煤产率和实际分选的精煤产率基本相近。反之,FGX分选机在低密度下分选,分选效率变差。通过对比干法分选模型模拟结果和半工业试验,证明该模型可用于干法分选的预测,对分选效果的预测和干法选厂流程设计具有指导意义。
To predict raw coal dU separation index effectively and realize quantitative simulation of influencing factors,the influence of upper size, lower size, whole size fraction separation density on 6 and E were analyzed. A mathematical model was also built. To verify the accuracy of the model,some dry separation tests were conducted in Nanyao coal mine. The results showed that,with the decrease of average particle size,the actual separation density increased,the separation of fine coal became worse significantly. The coefficient of association R2 between ＆-6 and Di was 0. 91. The coefficient of association R2 between Dz and the ratio of Ep and 6i was 0. 78. The results obtained by the mathematical model were close to the actual separation results of pilot tests. When the separation density was above 1.80 g/cm3 , the clean coal ash was more than 24% ,the separation efficiency was stable. Meanwhile, the theoretical clean coal yield was close to the actual result. The separation efficiency became worse when the separation density was low. The mathematical model provided reference lot separation efficiency prediction and dry separation plant flowsheet design.
出处
《洁净煤技术》
CAS
2016年第6期14-19,共6页
Clean Coal Technology
关键词
干法选煤
FGX分选机
数学模型
分选性能
分选预测
dry coal separation
FGX separator
mathematical model
separation performance
separation prediction
