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Experiments in Fluids

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01-07-2017 | Research Article

In-situ measurement of residence time distributions in a turbulent oxy-fuel gas-flame combustor

Authors: Sebastian Bürkle, Lukas G. Becker, Maria Angela Agizza, Andreas Dreizler, Volker Ebert, Steven Wagner

Published in: Experiments in Fluids | Issue 7/2017

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Abstract

For improving the design of combustors, the knowledge of residence-time distributions (RTD) is important as they influence exhaust gas compositions. Measuring RTDs in combustors is challenging, due to high temperatures, chemical reactions, the presence of particles or corrosive species as well as high turbulence levels. This paper presents a technique for the in situ measurement of RTDs in combustors. Based on tunable diode laser absorption spectroscopy (TDLAS), the temporal evolution of the concentration of tracers is tracked simultaneously at the combustion chamber inlet and outlet. Using either air or mixtures of oxygen and carbon dioxide (oxy-fuel atmosphere) as oxidants, the method is applied to reacting and non-reacting operating conditions in a 20-kW_th methane combustor. For reacting conditions, hydrogen chloride is used as a tracer, whereas for non-reacting conditions methane was chosen. Depending on the tracer, for a repetition rate of approximately 2 kHz detection limits of 16–40 ppm_V are achieved. For deriving RTDs, low-pass filtering is compared to reactor network modeling. Different RTDs observed for varying operating conditions are discussed.

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Title: In-situ measurement of residence time distributions in a turbulent oxy-fuel gas-flame combustor
Authors: Sebastian Bürkle
Lukas G. Becker
Maria Angela Agizza
Andreas Dreizler
Volker Ebert
Steven Wagner
Publication date: 01-07-2017
Publisher: Springer Berlin Heidelberg
Published in: Experiments in Fluids / Issue 7/2017
Print ISSN: 0723-4864
Electronic ISSN: 1432-1114
DOI: https://doi.org/10.1007/s00348-017-2366-2

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