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首页> 外文期刊>International Journal of Heat and Mass Transfer >Heat transfer behavior inside a furnace chamber of large-scale supercritical CFB reactor
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Heat transfer behavior inside a furnace chamber of large-scale supercritical CFB reactor

机译：大型超临界CFB反应器炉膛内的传热行为

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In this paper, heat transfer experiments were conducted in order to evaluate the contributions of particle convection, gas convection, cluster convection and also radiation from cluster and dispersed phases to the overall heat transfer coefficient in a furnace chamber of a large-scale supercritical CFB reactor. Heat transfer behavior in a circulating fluidized bed between the water membrane wall and bed inventory has been analyzed for Geldart B particles. Bed inventory used in the tests had particle density in the range of 2650-2750 kg/m~3. The experimental CFB facility has the dimension of 27.6 × 5.3 m in bed rectangular cross-section and 48 m in height of the furnace. The performance tests have been carried out at three different sizes of the bed material with Sauter mean particle diameters of 0.246, 0.272 and 0.444 mm. Above heat transfer studies have been conducted for the operating parameters covering the range of 1082-1183 K for bed temperature, 2.92-5.25 m/s for superficial velocity, 6.86-8.25 kPa for pressure drop, 23-25.6 kg/(m s~2) for the circulation rate of solids and 0.4-0.44 for the bed voidage at minimum fluidization velocity. In order to predict the overall heat transfer coefficient, a cluster renewal approach was used. The bed-to-wall heat transfer coefficients obtained in these operating ranges were about 78-226 W/(m~2 K). The contributions of convective and radiative heat transfer to the overall heat transfer coefficient were estimated. The variation in contributions depended on solid suspension density and bed temperature. The average contribution of convective and radiative heat transfer components varied between 13.5-54% and 46-86.5%, respectively.
机译：本文进行了传热实验，以评估颗粒对流，气体对流，团簇对流以及团簇和分散相的辐射对大型超临界CFB反应器炉膛内总传热系数的贡献。 。已对Geldart B颗粒在水膜壁和床层之间的循环流化床中的传热行为进行了分析。试验中使用的床料的颗粒密度为2650-2750 kg / m〜3。 CFB实验设备的床矩形横截面尺寸为27.6×5.3 m，炉膛高度为48 m。性能测试是在三种不同尺寸的床材料上进行的，苏特尔的平均粒径为0.246、0.272和0.444 mm。进行了以上传热研究，其工作参数涵盖床温1082-1​​183 K，表层速度2.92-5.25 m / s，压降6.86-8.25 kPa，23-25.6 kg /（ms〜2在最小流化速度下，固体的循环速度为），床空隙率为0.4-0.44。为了预测整体传热系数，使用了簇更新方法。在这些工作范围内获得的床对墙传热系数约为78-226 W /（m〜2 K）。估算了对流和辐射换热对总换热系数的贡献。贡献的变化取决于固体悬浮液的密度和床温。对流换热和辐射换热的平均贡献分别在13.5-54％和46-86.5％之间变化。

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