Verlag des Forschungszentrums Jülich
JUEL-3044
Lamm, Arnold
Modellmäßige Beschreibung und Simulation eines Heizsystems mit keramischem Strahlungsbrenner
137 S., 1995
Abstract:
Tbis report describes the mechanisms of heat and mass transfer as well as the processes of
flow witbin a catalytic radiant burner.
In a first step the behaviour of an uncoated as well as directly-coated (catalytic) radiant
burner is modelled for the combustion of natural gas in dependence upon the most important
system and operating parameters. Tbis step is confined to an analysis of the structure wall
and the outer side of the structure. On the basis of the stationary, one-dimensional
conservation equations it provides the destribution of temperatures and concentrations. From
tills the conversion, radiant efficiency and flame temperatures are derived. Furthermore an
estimation of the used catalysts with respect to the thermal resistance is possible. High
conversion levels along with temperatures above the thermal limits of stability show the
limits of catalytic combustion in the case of the directly-coated structure.
On the basis of the description of the radiant burner a program to simulate the heating-system
is introduced in a second step. By this means the total thermal efficiency in dependence upon
the operating parameters and geometric limiting quantities may be determined. It considers
the radiant heat exchange between the solid materials, radiant effects of the gas and
convective mechanisms of heat.
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