Heat transfer to the riser-wall of a circulating fluidised bed (CFB)

被引:23
|
作者
Brems, A. [1 ]
Caceres, G. [2 ]
Dewil, R. [1 ]
Baeyens, J. [3 ]
Pitie, E. [4 ,5 ]
机构
[1] Katholieke Univ Leuven, Dept Chem Engn, Chem & Biochem Proc Technol & Control Sect, B-3001 Heverlee, Belgium
[2] Univ Adolfo Ibanez, Fac Ingn & Ciencias, Santiago, Chile
[3] Beijing Univ Chem Technol, Sch Life Sci & Technol, Beijing 100029, Peoples R China
[4] Univ Warwick, Sch Engn, Coventry CV4 7AL, W Midlands, England
[5] Whittaker Engn Ltd, Upper Hindwells AB39 3UT, Stonehaven, England
基金
英国工程与自然科学研究理事会; 中国国家自然科学基金;
关键词
Heat transfer; Wall-to-suspension; Riser; Correlations; Prediction; Coefficient of heat transfer; RESIDENCE TIME DISTRIBUTION; SOLIDS FLOW; VELOCITIES; SUSPENSION;
D O I
10.1016/j.energy.2012.10.037
中图分类号
O414.1 [热力学];
学科分类号
摘要
The circulating fluidized bed is of increasing importance for gas-solid and gas-catalytic reactions, for drying, and recently its use in solar energy capture and storage has been advocated. In all applications, the supply or withdrawal of heat is a major issue, and the heat transfer coefficient from the gas-solid suspension to the heat transfer surface needs to be determined as design parameter. The present paper investigates the heat transfer coefficient for different operating gas velocity and solids circulation flux, whilst covering the different hydrodynamic solid flow regimes of dilute, core-annulus or dense mode. Measured values of the wall-to-bed heat transfer coefficients are compared with empirical predictions of both Molodstof and Muzyka, and Golriz and Grace. The application of a packet renewal mechanism at the wall is also investigated, and introducing the predicted solid contact time at the wall provides a very fair estimate of the heat transfer coefficient. Crown Copyright (C) 2012 Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码:493 / 500
页数:8
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