首页|CO Laser Absorption Measurements During Syngas Combustion at High Pressure

CO Laser Absorption Measurements During Syngas Combustion at High Pressure

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  • NETL
  • NSTL
  • Asme
Syngas is a desirable fuel for combustion in the Allam-Fetvedt cycle, which involves combustion under supercritical-CO_2 conditions. While some work has been conducted in collecting ignition delay times (IDT) at the extreme pressures required by these systems, significant model deficiencies remain. Additionally, considerable barriers in terms of nonideal gas dynamic effects have been shown for these experiments in shock tubes. Further investigation into the fundamental combustion kinetics of H_2/CO/CO_2 mixtures is required. Time-resolved speciation measurements for target species have been shown to better aid in improving the understanding of underlying chemical kinetics than global ignition delay time measurements. Therefore, laser absorption measurements of CO were measured behind reflected shock waves during combustion of syngas at 5 and 10 bar and temperatures between 1080 and 2100 K. The mixtures investigated utilized H_2-to-CO ratios of 1 :1 and 1:4, respectively, each at stoichiometric conditions, allowing for discussions of the effect of initial fuel composition. A ratio of fuel to CO_2 of 1:2 was also utilized to represent commercially available syngas. The mixtures were diluted in helium and argon (20% He, 76.5% Ar) to minimize thermal effects and to expedite CO thermal relaxation during the experiment. The resulting CO time histories were then compared to modern chemical kinetics mechanisms, and disagreement is seen for this system, which is assumed to be fairly well known. This study elucidates particular chemistry that needs improvement in moving toward a better understanding of syngas combustion at elevated pressures.

syngasshock tubeignition delay timeCO_2

Sean P. Cooper、Damien Nativel、Olivier Mathieu、Mustapha Fikri、Eric L. Petersen、Christof Schulz

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J. Mike Walker '66 Department of Mechanical Engineering, Texas ASM University, College Station, TX 77840

EMPI, Institute for Energy and Materials Processes, Reactive Fluids, University of Duisburg-Essen, Duisburg 47057, Germany

J. Mike Walker '66 Department of Mechanical Engineering, Texas A&M University, College Station, TX 77843

2023

10.1115/1.4063414

Journal of engineering for gas turbines and power: Transactions of the ASME

Journal of engineering for gas turbines and power: Transactions of the ASME

EI
ISSN：0742-4795
年,卷(期)：2023.145(12)
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