摘要
设计了管式布风流化床的布风装置,应用图像测速法研究了流化床内不同控制区域的流化特征。结果表明单管控制区沿纵向高度分成三个阶段:堆积死角区域、横向混合区域和充分发展区域;管间区域内颗粒呈左右对称的45°方向运动。在流化风速提高时,颗粒速度提高,横向混合加剧。在两层布风管中间,布风以气泡形式通过床层,加强了颗粒的运动和热交换,为渣的排出和冷却提供了条件。
A pipe-distributor fluidized bed system was designed. With the image veloeimetry, fluidization characters of different zones in fluidized bed were investigated. The results showed that the fluidized bed could be divided into dead zone, radial mixture zone and sufficiency development zone. Between two pipes, particles moved symmetrically side to side in the 45° direction. In the axis and longitudinal zone, particles velocity increased and the radial mixture was more intense along with the augment of fluidization velocity. Fluidization air passed through two layer zone as bubble, which intensified the particle movement and heat transfer and was benefit for ash discharge and cooling.
出处
《能源工程》
2007年第4期15-19,共5页
Energy Engineering
关键词
管式布风
图像法
流化床
流化特性
pipe-distributor
image method
fluidized bed
fluidization characters
