甲醇同步辐射流动管实验及中速船机工况下反应动力学机理研究

Synchrotron Radiation Flow Tube of Methanol and Reaction Kinetic Mechanism Under Operating Conditions of Medium-Speed Marine Engines

摘要

随着全球环境污染和能源短缺问题日益突出，用来源广泛且可再生的甲醇代替传统化石燃料成为船舶低碳排放的重要解决方案。为满足中速船机发动机燃烧设计对高效、稳定甲醇燃料的需求，必须对甲醇燃烧过程开展精确的数值模拟分析。当前甲醇基础燃烧实验停留时间普遍较长，且甲醇燃烧模型在船用发动机高温高压的热力学边界条件下不能准确地预测燃烧过程。本研究在毫秒级停留时间的流动管反应器中开展了甲醇热解和氧化实验，获取了甲醇燃料转化活性和关键中间产物分布数据；基于文献中产物分布、点火延迟时间和层流火焰速率基础燃烧实验数据，在中速船机热力学边界条件下结合敏感性分析对甲醇燃烧详细机理进行优化，得到甲醇燃料燃烧过程的甲醇机理（TJUMech）。结果表明，当前机理对甲醇热解和氧化实验中燃料转化和关键中间产物 (CH₂O 和 CO）做出了良好的预测；对中速船机热力学边界条件下宏观燃烧特性做出了良好的预测，并提升了高温富燃工况下的预测能力。

Abstract

With the escalating global challenges of environmental pollution and energy shortages，replacing tradi-tional fossil fuels with widely available and renewable methanol has emerged as a crucial solution to achieving low-carbon emissions in marine applications.To meet the demands of medium-speed marine engine combustion design for efficient and stable methanol fuel，it is essential to make a precise numerical simulation analysis of methanol combustion process.Current methanol combustion experiments typically involve long residence times，and existing methanol combustion models fail to accurately predict the combustion process under the high-temperature，high-pressure thermodynamic boundary conditions of marine engines.This study conducted methanol pyrolysis and oxi-dation experiments in a flow tube reactor with millisecond-level residence times，and obtained data on methanol fuel conversion activity and the distribution of key intermediates.Based on fundamental combustion experimental data from the literature-including product distribution，ignition delay time，and laminar flame speed-and com-bined with sensitivity analysis under the thermodynamic boundary conditions of medium-speed marine engines，a detailed methanol combustion mechanism（TJUMech）was optimized.The results demonstrate that the current mechanism effectively predicts fuel conversion and the distribution of key intermediates（CH₂O and CO）in metha-nol pyrolysis and oxidation experiments.It also provides accurate predictions of macroscopic combustion character-istics under the thermodynamic boundary conditions of medium-speed marine engines，and enhances the predictive capability under high-temperature，fuel-rich conditions.

关键词

甲醇 / 中速船机 / 化学反应动力学模型 / 流动管反应器

Key words

methanol / medium-speed marine engine / chemical reaction kinetic model / flow tube reactor

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基金资助

国家自然科学基金资助项目(52176124)