摘要
为研究喷动床内颗粒的流体力学与传热特性,采用计算流体力学-离散单元(CFD-DEM)耦合方法对多喷嘴喷动流化床(IMJSFB)内的颗粒进行数值模拟,将模拟结果与常规喷动床(CSB)对比。结果表明:IMJSFB内颗粒混合与流动特性明显优于CSB,表明侧开孔的存在改善了颗粒流动死区现象。IMJSFB内的颗粒总势能和颗粒总平移动能均低于CSB,侧开孔对主喷嘴气体实现了分流,削弱了喷射区的颗粒运动。当颗粒的传热系数低、热容小、进气温度较低时IMJSFB的优势更显著。
The characteristics of particle flow and heat transfer in multi-jet spout-fluidized bed(IMJSFB)were studied by the computational fluid dynamics-discrete element method(CFD-DEM),and the simulation results were compared with conventional spouted bed(CSB).The results showed that the mixing and flow characteristics of particles in IMJSFB were better than those in CSB,indicating that the presence of side holes improves the particle flow in dead zone.The total potential energy and total translational kinetic energy of particles in the IMJSFB are lower than those in CSB,and the existence of side holes diverts the gas from the main jet and weakens the movement of particles in spout region.The advantages of IMJSFB are obvious when the heat transfer coefficient of particles is low,the material heat capacity is small and the inlet temperature is low.
作者
刘雪峰
白谨豪
吴峰
马晓迅
危仁波
LIU Xuefeng;BAI Jinhao;WU Feng;MA Xiaoxun;WEI Renbo(Northern Shaanxi Energy Advanced Technology with Chemical Engineering Research Center of the Ministry of Education,School of Chemical Engineering,Northwest University,Xian 710069,China;Shaanxi Research Center of Engineering Technology for Clean Coal Conversion,Xian 710069,China)
出处
《高校化学工程学报》
EI
CAS
CSCD
北大核心
2023年第3期383-391,共9页
Journal of Chemical Engineering of Chinese Universities
基金
国家自然科学基金(22178286)。
关键词
多喷嘴喷动流化床
计算流体力学
颗粒混合特性
流动特性
multi-jet spout-fluidized bed
computational fluid dynamics(CFD)
particle mixing characteristics
flow characteristics
