摘要
在六个旋风分离器并联布置的循环流化床冷态试验台上,采用热示踪粒子法,考察了在不同静止床层高度、不同流化速度以及不同床料粒径条件下,示踪粒子在炉膛密相区的扩散特性。试验结果表明,示踪粒子的扩散主要在炉膛下部的密相区进行,且受返料以及近壁面的回流的影响,水平进料方向的扩散强度高于水平横向;提高流化速度有助于促进示踪粒子的横向扩散;示踪粒子在水平方向上的扩散受静止料层与进料口相对高度的影响,而并不仅局限于静止料层的绝对高度;细的示踪粒子的扩散强度高于粗的示踪粒子。
Hot tracer sand was used to investigate diffusion of the feed materials in the dense-phase zone of a circulating fluidized bed with six Cyclone separators in parallel at different static bed heights, fluidizing velocities and size of bed.. materials. Diffusion occurs mainly in the dense-phase zone, and the diffusion along the entry direction of materials is more intense than that along the perpendicular direction within the cross section under the influence of the returned＇ material and down flow along the walls. Increasing in the fluidizing velocity can promote horizontal diffusion. Horizontal, diffusion intensity is affected by the relative height of static bed and material inlet hole rather than the absolute height of static bed. Diffusion intensity i6 increased with the decrease of the sand size.
出处
《电站系统工程》
北大核心
2013年第2期1-4,共4页
Power System Engineering
基金
中国科学院战略性先导科技专项"低阶煤清洁高效梯级利用关键技术与示范"(XDA07030100)资助
关键词
循环流化床
六旋风分离器
热粒子示踪
扩散
circulating fluidized bed
six cyclone separators
thermal tracer method
diffusion
