Heat exchange and hydrodynamics during boiling on a horizontal tube bundle in a fluidized bed of solid particles

1982 ◽  
Vol 43 (5) ◽  
pp. 1195-1202
Author(s):  
M. I. Berman ◽  
O. A. Chulkin
Keyword(s):  
Heat Exchange ◽  
Fluidized Bed ◽  
Tube Bundle ◽  
Horizontal Tube ◽  
Solid Particles

scholarly journals Heat transfer characteristics of an external tube heat exchanger in a 1296t/h circulating fluidized bed boiler

2019 ◽  
Vol 137 ◽  
pp. 01014 ◽  
Author(s):  
Artur Blaszczuk ◽  
Szymon Jagodzik
Keyword(s):  
Heat Transfer ◽  
Fluidized Bed ◽  
Circulating Fluidized Bed ◽  
Tube Bundle ◽  
Horizontal Tube ◽  
Transfer Model ◽  
Heat Transfer Characteristics ◽  
Cfb Boiler ◽  
Transfer Data ◽  
Transfer Characteristics

In this research article, experimental study was carried out to obtain the heat transfer characteristics between a submerged horizontal tube bundle and a fluidized bed in a large-scale circulating fluidized bed (CFB) boiler with an external heat exchanger (EHE). The operational parameters in the tube EHE were measured during performance tests at variable load conditions. The average heat transfer coefficient (HTC) was calculated using a mechanistic heat transfer model based on packed renewal theory. The heat transfer characteristics are considered in terms of heat transfer mechanisms such as emulsion phase convection, gas convection and also thermal radiation. The obtained heat transfer data exhibit a maximum value with variation mean bed particle size irrespective of pressure. The results showed that the average HTC increases with a decrease of the Sauter mean particle diameter and with the increase of the fluidizing number as a result of good mixing dynamics in emulsion phase (i.e. emulsion wall contact time, bubble fraction in the bed). Based on the heat transfer data, empirical correlations are proposed for predicting a heat transfer coefficient from fluidized bed to horizontal tube bundle. The mechanistic heat transfer model predicted the average HTC in sufficiently good agreement with CFB boiler data accessible in the literature.

Heat transfer and bubble characteristics in a fluidized bed with immersed horizontal tube bundle

2003 ◽  
Vol 46 (3) ◽  
pp. 399-409 ◽  
Author(s):  
Sung Won Kim ◽  
Jung Yeul Ahn ◽  
Sang Done Kim ◽  
Dong Hyun Lee
Keyword(s):  
Heat Transfer ◽  
Fluidized Bed ◽  
Tube Bundle ◽  
Horizontal Tube ◽  
Bubble Characteristics

Bubble distribution and eruption diameter in a fluidized bed with a horizontal tube bundle

1979 ◽  
Vol 34 (9) ◽  
pp. 1163-1164 ◽  
Author(s):  
H.V. Nguyen ◽  
O.E Potter ◽  
A.B. Whitehead
Keyword(s):  
Fluidized Bed ◽  
Tube Bundle ◽  
Horizontal Tube ◽  
Bubble Distribution

Influence of Secondary Vortices of Thermogravitational Convection on the Liquid Metal Heat Exchange in a Horizontal Tube in a Magnetic Field

2006 ◽  
Vol 37 (8) ◽  
pp. 691-706 ◽  
Author(s):  
L. G. Genin ◽  
Ya. I. Listratov ◽  
N. G. Razuvanov ◽  
S. A. Ryzhkova ◽  
V. G. Sviridov
Keyword(s):  
Magnetic Field ◽  
Heat Exchange ◽  
Liquid Metal ◽  
Horizontal Tube ◽  
Thermogravitational Convection ◽  
Secondary Vortices
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