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Kinetics of plasma assisted pyrolysis and oxidation of ethylene. Part 1: Plasma flow reactor experiments

机译：等离子体辅助乙烯热解和氧化的动力学。第1部分：等离子流反应器实验

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Pyrolysis and oxidation kinetics of ethylene were studied with and without a high-voltage plasma discharge at atmospheric pressure from 420 K to 1250 K. Experiments were performed in a nearly isothermal flow reactor using mixtures diluted in either argon, helium, or nitrogen to minimize the temperature changes from chemical reactions. At the end of the isothermal reaction zone, the gas temperature was rapidly lowered to quench the reaction. Gas composition was then determined using inline non dispersive infrared analysis and sample extraction, where samples are stored in a multi-position valve for subsequent analysis with gas chromatography. Experiments were performed by fixing the flow rate or residence time in the reactor, and varying the temperature to achieve a reactivity map. The discharge region occupied approximately 11% of the total length of the isothermal reaction zone and could be placed anywhere along the length of the reactor. The discharge was found to enhance both the pyrolysis and oxidation reactions from 420 K to the self-ignition temperature of the fuel. Ethylene pyrolysis was enhanced nearly as much as oxidation below 750 K. For plasma-assisted pyrolysis, the results suggest that ethylene dissociation by electron-impact and collisional quenching with electronically excited states of argon, resulted in the direct formation of acetylene and the growth of larger hydrocarbons. During plasma-assisted oxidation, dissociation, and excitation of oxygen led to further fuel consumption, and enhanced the low temperature oxidative chemistry. Above 750 K, thermal reactions began to couple to the plasma driven reactions providing further oxidation. At the highest temperatures, the radical production by thermal reactions became competitive and the effectiveness of the plasma discharge decreased. (C) 2016 The Combustion Institute. Published by Elsevier Inc. All rights reserved.
机译：在有和没有高压等离子体放电的情况下，在420 K至1250 K的大气压下对乙烯的热解和氧化动力学进行了研究。在几乎等温的流动反应器中进行了实验，使用在氩气，氦气或氮气中稀释的混合物来最大程度地减少化学反应引起的温度变化。在等温反应区的末端，气体温度迅速降低以终止反应。然后使用在线非分散红外分析和样品提取来确定气体成分，其中将样品存储在多位阀中，以便随后通过气相色谱进行分析。通过固定反应器中的流速或停留时间，并改变温度以获得反应性图来进行实验。放电区域约占等温反应区总长度的11％，可以放置在反应器长度的任何位置。发现放电增强了从420 K到燃料自燃温度的热解和氧化反应。在750 K以下，乙烯的热解几乎可以被氧化。在等离子体辅助的热解中，结果表明，通过电子轰击和碰撞猝灭以及电子激发态的氩使乙烯解离，从而直接形成了乙炔并生成了乙炔。较大的碳氢化合物。在等离子体辅助的氧化过程中，氧的离解和激发导致进一步的燃料消耗，并增强了低温氧化化学作用。高于750 K时，热反应开始耦合到等离子体驱动的反应，从而提供进一步的氧化。在最高温度下，通过热反应产生的自由基变得具有竞争力，并且等离子体放电的有效性降低。 （C）2016年燃烧研究所。由Elsevier Inc.出版。保留所有权利。

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