导向管及其结构对喷动流化床物料流动特性的影响  

Effects of draft tube and its configuration on flow characteristics of materials of spout-fluidizing bed

作　　者：杨湄[1] 乔晓晖[1] 刘昌盛[1] 黄凤洪[1] 

机构地区：[1]中国农业科学院油料作物研究所,武汉430062

出　　处：《农业工程学报》2008年第2期145-148,共4页Transactions of the Chinese Society of Agricultural Engineering

基　　金：科技部科研院所技术开发研究专项资金项目;武汉市科技攻关项目(20062002063)

摘　　要：为开发生物质快速热解反应器,设计并建立了一内径为0.15 m、高度为1.04 m的导向喷动流化床冷模试验装置,在冷态试验条件和喷动气速、流化气速相同的情况下,考察了导向管内径、安装高度、长度对混合物料流动特性的影响。研究表明,固体循环速率、床层压降、中心喷泉高度随导向管内径的增加而增加;导向管长度为0.45 m时,固体循环速率和中心喷泉高度最大,床层压降最小;随导向管安装高度的增加,固体循环速率先增加后减小,需综合考虑喷动气的旁路与卷吸作用的平衡。In order to develop biomass fast pyrolysis reactor, an experimental equipment of spout-fluid bed with a draft tube of 0.15 m in inside diameter, and 1.04 m in height. Experiments were performed to investigate the effects of the inside diameter of draft tube, the installation height of draft tube and the length of draft tube on flow characteristics of mixing materials of spout-fluid bed with draft tube under the same cold mold experiment condition. The results show that solid circulation rate, central fountain height, bed pressure drop increase with the increment of the inside diameter; solid circulation rate and central fountain height are the maxima with the minimal pressure drop when the length of draft tube is 0.45 m; solid circulation rate is enhanced and then reduced with the increase of the installation height of draft tube, therefore the balance of spouting gas bypassing and entrainment effect must be synthetically calculated.

关 键 词：喷动流化床 导向管 固体循环速率 喷泉高度 床层压降 

分 类 号：TQ053.5[化学工程]