摘要
为拓宽气固流化床干法选煤加重质的粒级范围，分别配制了B—A型磁铁矿粉和B—A型粉煤，并按一定比例将两者混合作为宽粒级加重质，研究了其流化特性及分选性能，结果表明：由于A类颗粒中较细及密度较小物料的影响，随着床高增大，床层密度逐渐降低，且密度分布标准偏差较大，为0．0601g／cm^3．在合理的工艺及操作参数条件下，处于循环状态的0．3～0．074mm级磁铁矿粉和1～0．15mm级粉煤在流化床中分布均匀，床层密度均匀稳定，宽粒级加重质的流化性能良好，用于分选50～6mm煤炭，分选密度为1．61g／cm^3时，可能偏差（E值）为0．06g／cm^3，分选精度较高．
To expand the suitable size range of medium solids used in gas-solids fluidized beds for dry separation of coal, a type B-A magnetite powder and type B-A fine coal with a specific size distribution were mixed at a specific ratio of weight. The fluidization characteristics and separation performances of the mixture with a wide size range were studied. The results show that in the presence of particles with smaller size or lower density in group A powders,the bed density decreases gradually with the increasing of bed height with a high density standard deviation value of 0. 060 1 g/cm^3. Both magnetite powder with 0.3-0. 074 mm size and fine coal with 1-0. 15 mm size distribute uniformly in a commercial gas-solids fluidized bed with uniform and stable density, and the fluidization performances of recycled medium solids with a wide size range of 1-0. 074 mm are very good under suitable technical and operating parameters. The commercial fluidized bed using medium solids with a wide size range of 1-0. 074 mm can efficiently separate coal of 50-6 mm size with a low probable error E value of 0.06 g/cm^3 at a separating density of 1.61 g/cm^3.
出处
《中国矿业大学学报》
EI
CAS
CSCD
北大核心
2009年第4期509-514,共6页
Journal of China University of Mining & Technology
基金
国家高技术研究发展计划(863)项目(2007AA05Z318)
国家自然科学基金项目(90510002
50774084)
教育部科学技术研究重大项目(306008)
关键词
宽粒级加重质
气固流化床
流化特性
分选
medium solids with a wide size range
gas-solids fluidized bed
fluidization characteristic
separation
