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在某330MW亚临界循环流化床(CFB)锅炉炉膛水冷壁上开设测孔,利用水冷抽气取样枪对炉膛内的局部颗粒流率进行测量,研究炉膛近水冷壁区域的颗粒流率分布.结果表明:采用抽气取样法测量CFB锅炉炉膛颗粒流率时,颗粒净流率基本不受抽气速度的影响;炉膛稀相区的颗粒呈明显的环核流动分布,水冷壁附近存在较大的下行颗粒流率;炉膛第5层和第6层测孔高度的环核边界层厚度基本相同,环核边界层厚度约为0.1~0.18m,且随着空截面风速的增大而增加;炉膛内的防磨梁、悬吊屏结构和出口烟窗位置等对颗粒环核流动有较大的影响.
A test hole is set in the waterwall of a 330MW subcritical circulating fluidized bed (CFB) boiler, and the local particle flow rate in the furnace is measured by a water-cooled extraction sampling gun to study the particle flow rate distribution near the waterwall. The results show that the particle flow rate of the CFB boiler is basically independent of the pumping speed when the particle flow rate of the CFB boiler is measured by the exhaust sampling method. . The thickness of the annular boundary layer of the 5th and 6th boreholes in the hearth is basically the same, and the thickness of the annular boundary layer is about 0.1 ~ 0.18m, which increases with the increase of the wind speed of the empty section. Anti-wear beams in the furnace, suspension screen structure and the location of the outlet smoke windows have a greater impact on the flow of particles torus.