高压密相气力输送垂直弯管阻力特性  

Resistance characteristics of vertical bend in dense-phase pneumatic conveying of pulverized coal under high pressure

作　　者：周云[1] 陈晓平[1] 梁财[1] 孟庆敏[1] 鹿鹏[1] 

机构地区：[1]东南大学能源与环境学院,江苏南京210096

出　　处：《化工学报》2009年第3期580-584,共5页CIESC Journal

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

摘　　要：在输送压力可达4 MPa的气力输送实验台上,进行不同平均粒径煤粉的密相输送实验。从理论与实验两方面研究气固两相流流经弯管的压损随煤粉体积分数以及表观气速的变化规律。结果表明,高压密相输送中煤粉运动造成的能量损失是总压损的主要部分,且总压损随着煤粉体积分数的增加而增加。研究表明,相同质量流量下,随着表观气速的增加,弯管动能压损增加,摩擦压损降低;相同表观气速时,随着煤粉体积分数的增加,摩擦压损增加;固相摩擦系数与煤粉平均粒径及煤粉质量流量无明显关系,随着表观气速的增加略有下降。Experiments of dense-phase pneumatic conveying of pulverized coal with different mean particle sizes were carried out in an experimental test facility by using nitrogen with the conveying pressure up to 4 MPa. The pressure drop across the vertical bend was analyzed with experimentation and analytical calculation. The results showed that the pressure drop due to solids motion played a major role for the total pressure drop. At the same mass flow rate, the pressure drop due to kinetic energy loss increased with the increase in superficial velocity, while the pressure drop due to solids friction decreased. At the same superficial velocity, the pressure drop due to solids friction increased with the increase in solids volume fraction. The solids friction factor slightly decreased with the increase in superficial velocity, and was independent of particle size or mass flow rate.

关 键 词：高压密相气力输送 阻力特性 垂直弯管 平均粒径 

分 类 号：TQ531[化学工程—煤化学工程]