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Combustion and heat transfer characteristics in a square internally circulating fluidized bed combustor with draft tube

机译:带引流管的方形内部循环流化床燃烧器的燃烧和传热特性

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摘要

The effects of bed temperature (800-950 ℃) and gas velocity to the draft tube (0.26-0.37 m/s) on the heat transfer coefficient and the overall combustion efficiency have been determined in a square internally circulating fluidized bed combustor (0.28 m width × 2.6 m height) with an orifice-type square draft tube (0.1 m width × 0.9 m height). The overall combustion efficiency increases with increasing the excess air and the bed temperature. At a given aeration rate to the moving bed, the heat transfer coefficient goes through a maximum value with increasing gas velocity in the fluidized bed. The heat transfer coefficients in the moving bed and in the freeboard increase with increasing gas velocity to the fluidized bed and bed temperature.
机译:在正方形内部循环流化床燃烧器(0.28 m)中确定了床温(800-950℃)和气体流速对引流管(0.26-0.37 m / s)对传热系数和整体燃烧效率的影响。宽度×2.6 m高度)和一个孔板式方形引流管(0.1 m宽度×0.9 m高度)。总体燃烧效率随过量空气和床层温度的升高而增加。在给定的流化床曝气速率下,随着流化床中气体流速的增加,传热系数会达到最大值。移动床和干舷中的传热系数随流化床中气体流速和床温的增加而增加。

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