摘要
在传统喷动床的基础上,设计出一种多喷口环形喷动形式的新型喷动床.实验研究了喷口型式、喷口速度、颗粒类型对这种喷动床床内密相喷动流化区高度、可喷动静止床层高度及床层压降等参数的影响情况.结果表明:颗粒在床内的喷动形式沿床高方向呈现独特分区现象;随着喷口速度的增加,密相喷动高度和可喷动静止床层高度也相应增加;在同样的静止床层高度的情况下,直向型式的喷口更易形成喷动,床层的最小喷动速度几乎与静止床层高度呈线性关系;当床内形成较稳定的喷动后,床层压降随喷口速度的变化不明显,可视为常数.
A novel annular spouted bed with multiple nozzles was developed for spouting in annular space. Experiments were performed to study the effects of nozzle model, air flowrate and particle size, shape and density on maximum spouting height of dense-phase region, spoutable static bed height and spouting pressure drop in the bed. Results show that particle flow in the bed can be divided into three unique regimes along the bed height. Maximum spouting height of dense-phase region and spoutable static bed height increase as nozzle spouting velocity increases, Minimum spouting velocity increases almost linearly with the increase of the spoutable static bed height. As long as the bed remains in the fully developed spouting state, no matter whether nozzle spouting velocity increases or decreases, bed pressure drop remains nearly constant.
出处
《燃烧科学与技术》
EI
CAS
CSCD
北大核心
2008年第4期328-332,共5页
Journal of Combustion Science and Technology
基金
国家自然科学基金资助项目(50376033)
关键词
多喷口
环形喷动床
旋转锥体
喷口速度
压降
multiple nozzles
annular spouted bed
rotating cone
nozzle spouting velocity
pressure drop
