Numerical Simulation of Self-Ignition of Green Hydrogen and Methane Mixed Fuel for Catalytic Combustion in Micro-Channels

doi:10.12388/j.issn.1673-2677.2025.03.007

Abstract

Abstract:

Most of the oil and gas fields in China are located in remote areas with low ambient temperature throughout the year. It is necessary to heat the wellhead to prevent freezing. Micro catalytic burners can be used in many heating scenarios. However，methane alone is difficult to stably catalytically self-ignite at room temperature. By using China's abundant renewable energy such as wind power and photovoltaic power to produce green hydrogen and mix it with methane on precious metal Pt，catalytic self-ignition at room temperature can be achieved. Research on catalytic combustion of green hydrogen and methane mixed fuel is expected to play an important role in developing new techniques for wellhead anti-freezing and accelerate "low-carbonization" of energy. The reaction files of the catalytic reaction mechanism of hydrogen and methane mixed fuel on the surface of Pt catalyst are studied and imported into Fluent 2021R1 to build a three dimensional numerical computation model for the catalytic combustion of hydrogen and methane mixed fuel in micro-channels and explore the effects of the mixing ratio of hydrogen-methane and the synchronous and asynchronous supply of hydrogen and methane on the ignition of catalytic combustion. It is found that a low proportion of hydrogen leads to the deactivation of the catalyst，and a high proportion of hydrogen can trigger catalytic spontaneous combustion at room temperature. The synchronous supply mode is associated with a higher upper limit of the hydrogen proportion for catalyst deactivation and a smaller lower limit of the hydrogen proportion for catalytic spontaneous combustion. The simulation results show that the synchronous supply of hydrogen and methane，an inlet velocity of 1.0 m/s，a hydrogen and methane concentration ratio of 1∶1，and a micro-channel diameter of 1.5 mm are favorable for the catalytic self-ignition of hydrogen and methane mixed fuel. The performed numerical simulation reveals the catalytic self-ignition characteristics of green hydrogen and methane mixed fuel at room temperature and the evolution law of the ignition process，which lays a foundation for the application of such heating processes in oil and gas field production.

Key words:

hydrogen and methane mixed fuel, micro-channel, catalytic combustion, self-ignition, heterogeneous reaction

摘要：

我国油气田大多地处偏远，常年气温低下，需要对井口加热以实现防冻。微型催化燃烧器可用于诸多加热场景，但单一甲烷在室温下难以稳定催化自燃。利用我国丰富的风电、光伏等可再生能源制成绿氢与甲烷混合，在贵金属Pt上可实现室温下的催化自点火。开展绿氢甲烷混合燃料催化燃烧研究对拓展油气田井口防冻新工艺，加快能源“低碳化”进程意义重大。参考氢气甲烷混合燃料在Pt催化剂表面催化反应机理文件并导入Fluent 2021R1，建立了三维狭小通道氢气甲烷混合燃料催化燃烧数值计算模型，探究了甲烷和氢气混合比例、甲烷和氢气同步供给和非同步供给对催化燃烧点火的影响。发现氢气比例低时会导致催化剂失活，氢气比例高时可实现室温下催化自燃；同步供给方式导致催化剂失活的氢气比例上限更高，实现催化自燃的氢气比例下限更低。模拟结果表明，氢气和甲烷同步供给、入口速度1.0 m/s、氢气甲烷浓度比1∶1、狭小通道直径1.5 mm有利于氢气甲烷混合燃料催化自点火。模拟揭示了绿氢甲烷混合燃料室温下催化自点火特性及起燃过程的演变规律，为油气田生产加热工艺的应用奠定了基础。

关键词:

氢气甲烷混合燃料, 狭小通道, 催化燃烧, 自点火, 多相反应

CLC Number:

TQ028.8 ','1');return false;" target="_blank">
TQ028.8

DENG Shifeng, ZHOU Bingfeng, CHENG Jiahao, QU Teng, MENG Xiangjun, ZHAO Qinxin. Numerical Simulation of Self-Ignition of Green Hydrogen and Methane Mixed Fuel for Catalytic Combustion in Micro-Channels[J]. Xinjiang Oil & Gas, 2025, 21(3): 61-73.

邓世丰, 周冰峰, 成家豪, 曲腾, 孟向军, 赵钦新. 狭小通道绿氢甲烷混合燃料催化燃烧自点火数值模拟[J]. 新疆石油天然气, 2025, 21(3): 61-73.

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Numerical Simulation of Self-Ignition of Green Hydrogen and Methane Mixed Fuel for Catalytic Combustion in Micro-Channels

狭小通道绿氢甲烷混合燃料催化燃烧自点火数值模拟

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