135MW循环流化床锅炉流动模型  

The Model of Gas-Solid Flow Pattern for 135MW Circulating Fluidized Bed Boiler

作　　者：李智[1] 胡俊宇[1] 王翔凤[1] 于贵君[1] 

机构地区：[1]沈阳工程学院电力仿真控制辽宁省重点实验室,辽宁沈阳110136

出　　处：《锅炉技术》2009年第5期46-49,共4页Boiler Technology

基　　金：辽宁省高校科技计划项目(052L268)

摘　　要：针对135 MW循环流化床的特点,建立了密相区和稀相区的流动模型,并进行了宽筛分的处理。沿着床层轴线方向把稀相区均匀划分20个区段,沿着径向将每个区段划分为核心区和环形区,形成了连续的核心小室和环形小室,认为每个核心小室和环形小室内气固流动参数均匀,这样分别建立了每个核心小室和环形小室的流动模型。通过仿真计算表明,在布风板17 m以上,固体颗粒夹带流率沿炉膛高度呈缓慢下降的趋势;核心小室的空隙率较大,环型小室空隙率较小,在布风板9.8 m以上空隙率增大平缓;在密相区表面附近环型室厚度达到最大值,其后沿着炉高逐渐减少,在不到炉膛出口环型区就已经消失。所建的流动模型能够反映135 MW循环流化床锅炉的流动特性。Taking 135 MW circulating fluidized bed （CFB） boiler as the object, the flowed model of a dense part and a dilute part is established, which considers broad size distribution of feeding coal. The dilute part of CFB boiler is divided into 20 pieces in the direction of axial and all pieces are partitioned into the core-annulus structure in the direction of radial, so that the continuous cells of core-annulus can be built. Assume flowed parameters are identical in core-annulus cells, the model of gas-solid flow in all cells is established. The simulating results indicate that above air distribution plate 17 meters, the solid particle entrainment rate assume the trend coming down slowly along the height of the furnace. Void fraction of core cell is bigger, void fraction of annulus cell is smaller, void fraction increasing is gentle above air distribution plate 9.8 meters. Nearby dense part surface thickness of annulus cell maximizing, then which gradually reduces along height of the furnace, furnace outlet in less than annulus cell had disappeared. Flowed model can properly describe flowed character of gas-solid in 135 MW CFB boiler.

关 键 词：循环流化床 流动模型 核心小室 环形小室 

分 类 号：TK229.66[动力工程及工程热物理—动力机械及工程]