Numerical study on the auto-ignition characteristics of methane oxy-fuel combustion highly diluted by CO2
Numerical study on the auto-ignition characteristics of methane oxy-fuel combustion highly diluted by CO2
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CO2高度稀释甲烷全氧燃烧自燃特性数值研究
DOI：
10.1016/j.jtice.2020.09.005
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发表时间：
2020-09
影响因子：
5.7
通讯作者：
Banglin Deng
中科院分区：
文献类型：
--
作者：
Mingke Xie;Jianqin Fu;Yongxiang Zhang;Jingping Liu;Banglin Deng
CO2高度稀释的超临界甲烷全氧燃烧具有近零排放和高热效率的特点，是最有潜力的燃烧方式，但其自燃特性尚不清楚。本文引入了一个详细的化学反应动力学模型来研究其着火延迟时间。结果表明，在低温和高压区的折叠点是由于CH 3 O2，它只涉及Aramco-Mech 1.3。当温度升高时，在低压下，终止反应的抑制起主导作用，而在高压下，支化反应的促进对着火的加速作用更大。阐明了CO2/O-2比值的5种主要抑制途径及其变化规律。基于新提出的燃烧模式，发现不可忽略的CO2碰撞效应的温度依赖性在低压和高压下与全氧燃烧模式相反。本研究将研究范围扩展到更高压力，全面研究了影响甲烷自燃的相关因素，不仅为甲烷化学动力学研究提供了理论参考，而且有助于EGR、SCF和近零排放技术的进一步研究。(C)2020台湾化学工程师学会。Elsevier B. V.出版，保留所有权利。
The methane oxy-fuel combustion highly diluted by CO2 at supercritical region has the best potential for its near-zero emission characteristics and high thermal efficiency, while its auto-ignition characteristic is still not clear. In current investigation, a model with detailed chemical kinetic mechanism was introduced to research its ignition delay times (IDs). Results showed that the fold points in low-temperature and high-pressure region is due to CH3O2 which only involved in Aramco-Mech 1.3. When temperature increases, the inhibition of the termination reactions plays a dominate role at low pressure, while the promotion of the branching reactions contributes more to the acceleration of ignition at high pressure. Five dominant pathways and their variations were clarified to depict the inhibition effect of the ratio of CO2/O-2. Based on the newly proposed combustion mode, it was found that temperature dependence of the nonnegligible CO2 collision effect is opposite under low and high pressure with full-oxy combustion mode. This investigation extended the research region to higher pressure and comprehensively studied the relevant factors on the auto-ignition which not only provides theoretical reference for the chemical kinetics study of methane, but also contributes to the further researches of EGR, SCF and near-zero emissions technologies. (C) 2020 Taiwan Institute of Chemical Engineers. Published by Elsevier B.V. All rights reserved.
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