Kinetics and hydrothermal combustion characteristics of ethanol in supercritical water

IF 3.4 3区 工程技术 Q2 CHEMISTRY, PHYSICAL Journal of Supercritical Fluids Pub Date : 2024-04-23 DOI:10.1016/j.supflu.2024.106291
Lingling Zhang , Jie Zhang , Hulin Li , Jianjun Feng , Xinyue Tian
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Abstract

Supercritical hydrothermal combustion is a novel, clean, and efficient combustion method. In this work, a mechanism-based kinetic model of ethanol appropriate for high-pressure hydrothermal environment was developed. Combined with theoretical analysis and continuous ignition experiments, the transient ignition process, ignition temperature, and extinction temperature were discussed. A turbulent combustion model coupling detailed kinetics was constructed to analyze the co-flow diffusion hydrothermal flame. It was found that the ethanol kinetic model can well predict the reaction process, critical ignition temperatures, extinction temperatures, and diffusion combustion process of hydrothermal combustion. The ignition temperatures of 2.40–5.72 wt% ethanol ranged between 500–390 °C, and OH was a significant ignition indicator. As an auxiliary fuel, ethanol is superior to methanol. During co-flow hydrothermal combustion, the interfacial reaction between fuel and oxidant in jet core area had an important influence, and the local high-temperature flame was mainly distributed near the downstream of fuel jet.

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乙醇在超临界水中的动力学和水热燃烧特性
超临界水热燃烧是一种新型、清洁、高效的燃烧方法。本研究建立了适合高压水热环境的乙醇机理动力学模型。结合理论分析和连续点火实验,讨论了瞬态点火过程、点火温度和熄灭温度。构建了一个耦合了详细动力学的湍流燃烧模型来分析共流扩散热液火焰。研究发现,乙醇动力学模型可以很好地预测热液燃烧的反应过程、临界点火温度、熄灭温度和扩散燃烧过程。2.40-5.72 wt%乙醇的点火温度在 500-390 °C 之间,OH 是一个重要的点火指标。作为辅助燃料,乙醇优于甲醇。在共流水热燃烧过程中,燃料与氧化剂在射流核心区的界面反应具有重要影响,局部高温火焰主要分布在燃料射流下游附近。
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来源期刊
Journal of Supercritical Fluids
Journal of Supercritical Fluids 工程技术-工程:化工
CiteScore
7.60
自引率
10.30%
发文量
236
审稿时长
56 days
期刊介绍: The Journal of Supercritical Fluids is an international journal devoted to the fundamental and applied aspects of supercritical fluids and processes. Its aim is to provide a focused platform for academic and industrial researchers to report their findings and to have ready access to the advances in this rapidly growing field. Its coverage is multidisciplinary and includes both basic and applied topics. Thermodynamics and phase equilibria, reaction kinetics and rate processes, thermal and transport properties, and all topics related to processing such as separations (extraction, fractionation, purification, chromatography) nucleation and impregnation are within the scope. Accounts of specific engineering applications such as those encountered in food, fuel, natural products, minerals, pharmaceuticals and polymer industries are included. Topics related to high pressure equipment design, analytical techniques, sensors, and process control methodologies are also within the scope of the journal.
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