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首页> 外文期刊>RSC Advances >Hydrogen-assisted catalytic ignition characteristics of propane-air with a chemical kinetic model in a Pt/gamma-Al2O3 micro-combustor in different feeding modes
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Hydrogen-assisted catalytic ignition characteristics of propane-air with a chemical kinetic model in a Pt/gamma-Al2O3 micro-combustor in different feeding modes

机译：Pt /γ-Al2O3微型燃烧器中不同进料方式下丙烷空气的氢催化催化点火特性及化学动力学模型

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摘要

From ambient cold-start conditions, the hydrogen self-ignition and hydrogen-assisted ignition of propane-air mixtures with a chemical kinetic model in different feeding modes were investigated numerically in Pt/gamma-Al2O3 catalytic micro-combustors. For the steady and transient state, the micro-combustion and selfignition characteristics of lean hydrogen-air mixtures were presented, and the hydrogen-assisted combustion of propane-air mixtures was investigated numerically in the co-feed mode and the sequential feed mode. The computational results indicate the large thermal inertia of the micro-combustor solid structure leads to slow temperature dynamics, and the transient response is dominated by the thermal inertia. In general, the concentration of hydrogen required for propane ignition increased with increasing wall thermal conductivity, decreasing inlet velocity, and decreasing inlet equivalence ratio of propane-air mixtures. In the co-feed mode, the combustion characteristics of hydrogen-assisted propane qualitatively resemble the selectively preheating initial portion of the combustion chamber wall. In the sequential feed mode, the time taken to reach the steady state, the hydrogen cut-off time, the propane ignition time and the cumulative propane emissions increased with increasing wall thermal conductivity; the ignition characteristics are similar to partially preheating the initial segment of the micro-combustor for low and moderate wall thermal conductivity values (0.5 and 20 W m(-1) K-1); however, the ignition characteristics are close to completely heating the micro-combustor wall for high wall thermal conductivity values (200 W m(-1) K-1). The minimum cumulative amount of hydrogen usage and minimization of startup time are discussed.
机译：从环境冷启动条件出发，在Pt /γ-Al2O3催化微燃烧器中，以化学动力学模型对丙烷-空气混合物的氢自燃和氢助燃进行了数值研究。对于稳态和过渡态，提出了稀氢-空气混合物的微燃烧和自燃特性，并在共进料模式和顺序进料模式下对丙烷-空气混合物的氢辅助燃烧进行了数值研究。计算结果表明，微燃烧器固体结构的大热惯性导致缓慢的温度动力学，瞬态响应受热惯性支配。通常，丙烷着火所需的氢浓度随壁导热率的增加，入口速度的减小和丙烷-空气混合物的入口当量比的减小而增加。在共同进料模式中，氢辅助丙烷的燃烧特性定性地类似于燃烧室壁的选择性预热初始部分。在顺序进料模式下，达到稳态所需的时间，氢气的截止时间，丙烷着火时间和丙烷累积排放量随着壁导热率的增加而增加;点火特性类似于在低和中等壁热导率值（0.5和20 W m（-1）K-1）下部分预热微型燃烧器的初始部分;但是，对于高壁热导率值（200 W m（-1）K-1），点火特性接近完全加热微型燃烧器壁。讨论了氢气使用量的最小累积量和启动时间的最小化。

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