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首页> 外文期刊>Experimental Thermal and Fluid Science: International Journal of Experimental Heat Transfer, Thermodynamics, and Fluid Mechanics >Parametric studies and effect of scale-up on wall-to-bed heat transfer characteristics of circulating fluidized bed risers
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Parametric studies and effect of scale-up on wall-to-bed heat transfer characteristics of circulating fluidized bed risers

机译：参数研究和放大对循环流化床立管壁床传热特性的影响

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摘要

In the present work a comparative study of steady state wall-to-bed heat transfer was conducted along the risers of height 2.85m of three different circulating fluidized beds (CFBs) with bed cross sections of 0.15m×0.15m, 0.20m×0.20m, and 0.25m×0.25m, respectively. Experiments were conducted on each CFB unit for five superficial air velocities (U=2.5m/s, 2.75m/s, 3m/s, 3.3m/s, and 4m/s) and two different weights of sand inventory per unit area of the distributor plate (P=1750N/m~2 and P=3050N/m~2) with average sand particle size of 460μm. Bed temperature distributions across the three risers were measured and compared at different heights (1.04m, 1.64m, and 2.24m above the distributor plate). Axial distribution of heat transfer coefficient along the height of riser was evaluated and compared for the three bed cross sections. Effect of superficial velocity of air, sand inventory, and bed cross section on bed temperature and heat transfer coefficient was investigated. An empirical correlation was developed for the bed Nusselt number as a function of various non-dimensional parameters based on the parametric study. The correlation was compared with available literatures.
机译：在目前的工作中，沿床横断面分别为0.15m×0.15m，0.20m×0.20的三个不同循环流化床（CFB）的高度2.85m的立管进行了稳态壁到床传热的比较研究。 m和0.25m×0.25m。在每个CFB单元上进行了五种表面风速（U = 2.5m / s，2.75m / s，3m / s，3.3m / s和4m / s）的实验，每单位面积的砂储量有两种不同的重量。分布板（P = 1750N / m〜2，P = 3050N / m〜2），平均砂粒尺寸为460μm。测量了三个立管上的床温分布，并在不同高度（分布板上方1.04m，1.64m和2.24m）处进行了比较。沿立管高度对传热系数的轴向分布进行了评估，并对三个床的横截面进行了比较。研究了空气的表观速度，沙量和床截面对床温度和传热系数的影响。基于参数研究，床Nusselt数与各种无量纲参数的函数之间建立了经验相关性。相关性与现有文献进行了比较。

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