生物质粉体下料罐流动特性的数值模拟及实验研究  

Numerical Simulation and Experimental Studies of the Fluidization Characteristics of a Biomass Powder Hopper

作　　者：曹代科 靳世平[1] 黄芬霞[1] 王思佳[1] 李晟[1] 张星逸 杨继行 CAO Daike JIN Shiping HUANG Fenxia WANG Sijia LI Sheng ZHANG Xingyi YANG Jihang(School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, Chin)

机构地区：[1]华中科技大学能源与动力工程学院,湖北武汉430074

出　　处：《工业加热》2016年第6期20-25,共6页Industrial Heating

基　　金：国家科技支撑计划项目:生物燃气产生模式研究与利用示范(2015BAD21B00)

摘　　要：使用CFD软件对生物质流化下料罐流动现象进行分析,研究不同流化风量对于下料罐内粉料堆积层流化效果的影响,下料过程中压差大小以及流化风量对于粉料下料速率的影响。搭建下料平台半工业实验台架,用实验数据验证模拟模型。研究结果表明:流化过程中流化风量的选择直接影响流化效果,过大的下料罐体积会增大对于流化风量的要求,增加能耗;压差是料仓下料速率主要控制因素,压差越大,粉料下料速率越大,同时更大压差能有效改进粉料下料稳定性;下料过程中流化风量的引入也可以很大程度上增加粉料下料速率,但过大的流化风量会降低出口混合流中粉料体积分数,降低经济性。This paper aimed to analyse the effects of fluidization which generated in the stacked layers of the biomass powder hopper using CFD software. The effects of the differential pressure and the different fluidization air flow rate on the feeding rate of the biomass powder were also contained. The experiments had been carried out on a self-designed experimental feeding facility. Using the experimental datas vertified the accuracy of the numerical simulations. It was found that the fluidization air flow rate had the direct influence on the fluidization and the oversize hopper required more accurate fluidization air flow rate,and then it would consume more energy. Differential pressure was the main control factor. The feeding rate of the biomass powder would increase when the differential pressure increased. The larger difference of the pressure would improve the stability of the powder feeding. In the feeding process,adding the fluidization air flow led to the larger feed-ing rate greatly. But excessive fluidization air flow would reduce the volume fraction of the biomass powder in the outlet,and the economical efficiency would also decrease.

关 键 词：生物质 粉体下料 数值模拟 流化特性 下料速率 

分 类 号：Q946.8[生物学—植物学]