Library Subscription: Guest
ICHMT DL Home Current Year Archives Executive Committee International Centre for Heat and Mass Transfer


DOI: 10.1615/ICHMT.2008.CHT.2100
17 pages

J. Wurm
Siemens VAI Metals Technologies GmbH & Co, Turmstrasse 44, P. O. Box 4, A-4031 Linz, Austria

Hans Haering
University of Technology Dresden

B. Weiss
Siemens VAI Metals Technologies GmbH & Co., Turmstrasse 44, P.O. Box 4, A-4031 Linz, Austria

Franz Winter
Institute of Chemical Engineering, Christian Doppler Laboratory for Chemical Engineering at High Temperatures Vienna University of Technology, Getreidemarkt 9/166, A-1060 Vienna, Austria

R. Lange
Institute of Process Engineering and Environmental Technology, Dresden University of Technology, Miinchner Platz 3, D-01062 Dresden, Germany

Georg Aichinger
Siemens VAI Metals Technologies GmbH & Co, Turmstrasse 44, P. O. Box 4, A-4031 Linz, Austria


Objective of the investigation is the influence of dust on the heat transfer in a fixed bed reactor. Industrial application shows that the heat transfer with dust is significantly smaller than without dust. To determine the reason for this effect, a laboratory-scale fixed bed reactor was built and transient temperature profiles measured at different positions in the fixed bed. In the experimental study a three-phase-system (solid, solid, gas) including dust is compared with a two-phase-system (solid, gas) for three different bed materials, such as mono- and polydisperse full iron spheres, direct reduced iron ore and char particles. The measured data were evaluated by using a modified two-phase model with separate heat balances for a pseudo homogenous solid and a gas phase which was solved by analytical approximation and numerical method using commercial program Aspen Custom Modeler®. For the determination of the heat transfer coefficients parameter estimation has been done using the program internal Nelder Mead algorithm. The results were compared with established correlations and data from literature and show significant influence of dust on the heat transfer rates due to channelling effects caused by local dust accumulation. Due to particle size distribution and different specific surfaces the reduction of the heat transfer coefficient gas-solid for char and DRI is less pronounced than for mono- and polydisperse full iron spheres. The heat transfer coefficient decreases to six percent in comparison with the results without dust.

ICHMT Digital Library

Bow shocks on a jet-like solid body shape. Thermal Sciences 2004, 2004. Pulsed, supersonic fuel jets - their characteristics and potential for improved diesel engine injection. PULSED, SUPERSONIC FUEL JETS - THEIR CHARACTERISTICS AND POTENTIAL FOR IMPROVED DIESEL ENGINE INJECTION
View of engine compartment components (left). Plots of temperature distributions in centreplane, forward of engine (right). CHT-04 - Advances in Computational Heat Transfer III, 2004. Devel... DEVELOPMENT AND CURRENT STATUS OF INDUSTRIAL THERMOFLUIDS CFD ANALYSIS
Pratt & Whitney's F-135 Joint Strike Fighter Engine under test in Florida is a 3600F class jet engine. TURBINE-09, 2009. Turbine airfoil leading edge stagnation aerodynamics and heat transfe... TURBINE AIRFOIL LEADING EDGE STAGNATION AERODYNAMICS AND HEAT TRANSFER - A REVIEW
Refractive index reconstructed field. (a) Second iteration. (b) Fourth iteration. Radiative Transfer - VI, 2010. Theoretical development for refractive index reconstruction from a radiative ... THEORETICAL DEVELOPMENT FOR REFRACTIVE INDEX RECONSTRUCTION FROM A RADIATIVE TRANSFER EQUATION-BASED ALGORITHM
Two inclusion test, four collimated sources. Radiative Transfer - VI, 2010. New developments in frequency domain optical tomography. Part II. Application with a L-BFGS associated to an inexa... NEW DEVELOPMENTS IN FREQUENCY DOMAIN OPTICAL TOMOGRAPHY. PART II. APPLICATION WITH A L-BFGS ASSOCIATED TO AN INEXACT LINE SEARCH