Mechanism Reduction for Hetero-/Homogeneous Combustion of Syngas over Platinum

Abstract

Detailed catalytic and gas-phase reaction mechanisms were reduced for the hetero-/homogeneous combustion of H2/CO/O2/N2 mixtures using the directed relation graph (DRG) method. Simulations were performed in a Pt-coated planar channel using a 2-D steady Navier Stokes code with either detailed or reduced catalytic and gas-phase reaction mechanisms for a wide range of operating conditions. Catalytic and gas-phase reaction mechanisms were treated as a unit and reduced together for fuel-lean and low-pressure fuel-rich cases, while reduced separately for high-pressure fuel-rich cases. The reduced mechanisms well reproduced the major gaseous species concentrations, gas temperatures and homogeneous ignition distances obtained with the detailed mechanisms, thus demonstrating the capacity of DRG in reducing combined catalytic/gas-phase reaction mechanisms. As such, it can provide a quick indication of the important reactions and contributions of both reaction pathways prior to simulations, and is of main interest for large scale simulations used for the design and thermal management of practical catalytic combustion systems.

Meeting Name

12th Asia-Pacific Conference on Combustion, ASPACC 2019 (2019: Jul. 1-5, Fukuoka, Japan)

Department(s)

Mechanical and Aerospace Engineering

Comments

RS acknowledges the financial support from the Swiss National Science Foundation Fellowship (Award Number 178619).

Keywords and Phrases

Catalysis; Combustion; Directed graphs; Fuels; Navier Stokes equations; Phase interfaces; Platinum, Catalytic combustion system; Directed relation graph; Gas-phase reactions; Gaseous species concentrations; Large scale simulations; Mechanism reduction; Operating condition; Reduced mechanisms, Gases

Document Type

Article - Conference proceedings

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2019 Asia-Pacific Conference on Combustion, All rights reserved.

Publication Date

01 Jul 2019

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