煤粉平均粒径对高压密相气力输送的影响  

Effect of Mean Particle Size of Pulverized Coal on Dense Phase Pneumatic Conveying at 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]东南大学能源与环境学院,江苏省南京市210096

出　　处：《中国电机工程学报》2009年第26期25-29,共5页Proceedings of the CSEE

基　　金：国家重点基础研究发展计划项目(973项目)(2004CB217702-01);国家高技术研究发展计划项目(863计划)(2006AA05A103)~~

摘　　要：在输送压力可达4MPa的气力输送实验台上,进行氮气-煤粉密相输送实验,研究不同平均粒径煤粉质量流量与注入速度的关系,分析不同平均粒径煤粉在水平管、垂直管、水平弯管、垂直弯管内输送时的压降变化规律。结果表明:随着进入发料罐内风量的增加,平均粒径小的煤粉较之平均粒径大的煤粉质量流量先达到峰值,其最佳注入速度低于平均粒径大的煤粉;在相同质量流量下,平均粒径大的煤粉,其压降要高于平均粒径小的煤粉,但当管道内煤粉浓度较高时,平均粒径小的煤粉压降有接近于平均粒径大的煤粉的趋势;相同质量流量下,垂直管内的压降高于水平管,水平弯管的压降也高于水平管。Experiments of dense phase pneumatic conveying of pulverized coal using nitrogen were carried out in an experimental test facility with the conveying pressure up to 4 MPa. The relationship between mass flow rate of pulverized coal with different mean particle size and gas injecting velocity were investigated. Also, the characteristics of pressure drop in the horizontal pipe, vertical pipe and bend with different mean particle size of pulverized coal were analyzed. Test results indicate that, with the increase in total gas flow rate enters into the feeding hopper, the mass flow rate of fine coals reaches the peak value earlier than that of coarse coals, but the optimum injecting velocity is lower than that Of coarse coals. In addition, it is showed that the pressure drop for coarse coals is higher than that of fine coals with the same mass flow rate, and when the coal concentration in the pipe is higher enough, the conveying pressure drop for fine coal is close to that of coarse coal. The pressure drop in vertical pipe is higher than that in horizontal pipe, and the pressure drop in horizontal pipe is lower than that in horizontal bend with the same mass flow rate.

关 键 词：高压密相气力输送 平均粒径 压降 煤粉 

分 类 号：TQ51[化学工程]