不同平均粒径煤粉的高压密相气力输送  

Dense-phase Pneumatic Conveying for Pulverized Coal with Different Mean Particle Size Under High Pressure

作　　者：周云[1] 陈晓平[1] 梁财[1] 孟庆敏[1] 鹿鹏[1] 蒲文灏[1] 许盼[1] 

机构地区：[1]东南大学热能工程研究所,南京210096

出　　处：《动力工程》2009年第3期218-222,共5页Power Engineering

基　　金：国家重点基础研究发展计划资助项目(2004CB217702-01);国家高技术研究发展计划项目(2006AA05A103)

摘　　要：在高压密相气力输送试验台上,进行了不同平均粒径煤粉的密相输送试验.分析了总输送差压和流化风量对不同平均粒径煤粉输送特性的影响,以及水平管和水平弯管的阻力特性.结果表明:增加总输送差压或者流化风量,煤粉的体积分数都经历了一个先增大后减小的过程;系统的输送能力随着煤粉平均粒径的增大而降低;在相同表观气速及煤粉质量流量下,平均粒径大的煤粉压损大于平均粒径小的煤粉压损;输送相同质量流量煤粉时,水平弯管的压损大于水平管,且水平弯管与水平管压损的比值随着煤粉质量流量的增加而增大.Experiments of dense-phase pneumatic conveying for pulverized coal with different mean particle size were carried out on the test rig of high pressure dense-phase pneumatic conveying. The influence of total conveying differential pressure and flow rate of fluidizing gas on conveying performance of pulverized coat with different mean particle size was investigated. Also, the resistance characteristrcs of horizontal pipe and horizontal bend pipe of pulverized coal with different mean particle size were analyzed. Results show that the volume fraction of pulverized coal rises at first and then declines with the increase of the total conveying differential pressure or the flow rate of the fluidizing gas. The conveying ability of the system decreases with increasing the mean particle size of pulverized coal. The pressure drop of the pulverized coal with large mean particle size is higher than that of the pulverized coal with small mean particle size at same apparent gas velocity and same mass flow rate of pulverized coal. When same mass flow rate of pulverized coal is conveyed, the pressure drop of horizontal bend pipe is higher than that of horizontal pipe. The ratio of pressure drop for horizontal bend pipe to horizontal pipe increases with increasing the mass flow rate of pulverized coal.

关 键 词：密相气力输送 煤粉 输送特性 阻力特性 

分 类 号：TK229.66[动力工程及工程热物理—动力机械及工程]