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International Symposium on Imaging in Transport Processes.
May, 25-29, 1992, Athens, Greece

DOI: 10.1615/ICHMT.1992.IntSympImgTranspProc


ISBN Print: 978-1-56700-012-2

FLOW VISUALIZATION AND MEASUREMENT OF CONCENTRATION FIELDS IN GASES BY OPTICAL TOMOGRAPHY

pages 75-86
DOI: 10.1615/ICHMT.1992.IntSympImgTranspProc.90
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SINOPSIS

Mixing of gases with different temperatures and concentrations is a significant problem in the chemical industry. The kinetic energy of the gas flow is used for the mixing process. The goal of research in this area is the realization of homogeneous concentration and temperature fields in ducts and channels after short mixing lengths of fluid flow. Pressure losses due to mixing phenomena should be kept small.
In the application of gas cleaning processes, components like ammonia have to be mixed with the waste gas. Independent of whether the flue gas mixture passes a catalytic reactor, complete and homogeneous blending of the reactants is essential for efficient waste gas treatment. As a result of optimizing the injection of ammonia into the waste gas, the necessary volume of the catalyst will be reduced.
If the catalytic reduction follows the absorption of sulphur dioxide, the cold waste gas has to be heated up to the working temperature of the catalytic reactor. This can be realized by mixing the cold waste gas with a second hot gas stream. Due to different viscosities of the two gas streams, the necessary mixing length for reaching homogeneous temperature fields in the cross-sectional area of the catalyst is long.
In both cases, small gas streams have to be injected and distributed into a large waste gas stream. It is still not possible to predict the degree of mixing and the pressure loss of different mixing devices.

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