【作者】 李天津； 陈凤； 何学东； 陈文胜； 罗杰； 黄志勇；

【Author】 LI Tian-jin,CHEN Feng,HE Xue-dong,CHEN Wen-shen, LUO Jie,HUANG Zhi-yong (Institute of Nuclear and New Energy Technology,Tsinghua University,Beijing 100084,China)

【机构】 清华大学核能与新能源技术研究院；

【摘要】 在以常温常压空气为气源的压送式气力输送试验系统中,提升管入口空气流速u_g15 m/s～31 m/s内,研究了提升管由于玻璃球的加入而产生的固相附加压损的特性。试验结果表明:提升管单位管长固相附加压降随u_g的增大由2.7 kPa/m先减小至2.0 kPa/m后逐渐增大至2.3 kPa/m;固相附加压损系数λ_z由0.036先迅速减小至约0.023,再缓慢减小为约0.016后基本保持不变;Sankar报导的颗粒速度经验关联式及Garic、Yang等报导的固相摩擦系数经验关联式可供工程设计中u_g大于21 m/s时参考使用;由气相重力、固相重力、气相摩擦及固相摩擦四项各自产生的压降占提升管总压降的比例依次为小于1%、约11%～18%、约3%～12%及约75%;固相摩擦压降是提升管总压降的主要部分,可考虑适当增大提升管内径及适当减小固气比以减小提升管总压降。更多还原

【Abstract】 The additional pressure drop due to solids in the riser for the pneumatic conveying of the absorber spheres is investigated in the positive pressure transport system.The glass spheres are transported with the ambient air as the source gas.The air velocity at the riser inlet,u_g,is in the range of 15 m/s～31 m/s.Experimental results show that the additional pressure drop per unit length due to solids in the riser first decreases from 2.7 kPa/m to 2.0 kPa/m and then increases to 2.3 kPa/m with the increase of u_g.The additional pressure drop coefficient due to solids in the riser,λ_z,first sharply decreases from 0.036 to 0.023 and then slowly decreases to remain at～0.016.The particle velocity correlation reported by Sankar et al and the solid friction coefficient correlations reported by Garic et al and Yang can be used in the engineering design when u_g is above 21 m/s.The ratio of the pressure from gas gravity,solids gravity,gas friction and solids friction to the riser total pressure drop is below 1%,about 11%～18%,about 3%～12%and about 75%,respectively.The appropriate increase the inner diameter of the riser and/or decrease the solid hold up is recommended to reduce the pressure drop from solids friction,which is the dominant part of the total pressure drop of the riser.更多还原