高温高压下乙烷/乙烯着火延迟时间测定和动力学建模

石油炼制与化工 ›› 2023, Vol. 54 ›› Issue (7): 34-40.

高温高压下乙烷/乙烯着火延迟时间测定和动力学建模

马守涛^1,2,姜杰^1,2,孙冰^1,2,孟瑞佶¹,朱云峰^1,2,徐伟^1,2

1. 中石化安全工程研究院有限公司
2. 化学品安全控制国家重点试验室

收稿日期:2022-12-13 修回日期:2023-03-20 出版日期:2023-07-12 发布日期:2023-06-21
通讯作者: 马守涛 E-mail:mast.qday@sinopec.com
基金资助:
含氧易爆体系本质安全化气固相微反应技术研究

MEASUREMENT OF ETHANE/ETHYLENE IGNITION DELAY TIME AND KINETIC MODELING UNDER HIGH PRESSURE AND HIGH TEMPERATURE

Received:2022-12-13 Revised:2023-03-20 Online:2023-07-12 Published:2023-06-21

摘要/Abstract

摘要： 为研究乙烯/乙烷在高温高压下的着火特性，采用试验与动力学建模工具考察了乙烷/乙烯与氧气混合气在不同工况下的着火延迟时间变化规律。试验结果表明：在试验温度为680~800 K范围内，当压力为1.0 MPa时，乙烯/乙烷没有发生自着火现象；而当压力为2.0 MPa时，乙烷/乙烯会发生自着火现象，乙烯的起始着火温度低于乙烷的起始着火温度，且温度越高着火延迟时间越短。此外，对乙烯/乙烷自着火过程的敏感性和反应途径分析结果显示：促进乙烷自着火的反应是脱氢和生成.C₂H₅、.OH自由基的基元反应，促进乙烯自着火的反应是氧化或脱氢等生成活泼自由基.HCO,.O,.OH,.C₂H₃的基元反应；对乙烯/乙烷自着火起抑制作用的是消耗.OH、.HO₂等自由基，生成稳定化合物的反应；氧化脱氢是使乙烯、乙烷发生链引发而自着火的初始步骤，其反应速率对着火延迟时间影响很大。

关键词: 乙烷, 乙烯, 着火延迟, 化学动力学

Abstract: In order to study the ignition characteristics of ethane/ethylene at high pressure and temperature, the variation of ignition delay time of ethane/ethylene-oxygen mixture under different operating conditions was investigated by experimental method and kinetic modeling tools. The experimental data showed that there was no self-ignite of ethylene/ethane at the pressure of 1.0 MPa and the temperature of 680-800 K, but the self-ignition of ethane/ ethylene occurred at the pressure of 2.0 MPa. The initial ignition temperature of ethylene was lower than that of ethane, and the higher the temperature was, the shorter the ignition delay time was. In addition, the analysis of sensitivity and reaction pathway of ethane and ethylene self-ignition process showed that the reactions that promoted the self-ignition of ethane was dehydrogenation and formation of .C₂H₅ and .OH radical, and the primary reactions that promoted the self-ignition of ethylene was oxidation or dehydrogenation to form active free radicals .HCO,.O,.OH,.C₂H₃. The inhibition of self-ignition of ethane and ethylene was the reaction of consuming .OH and .HO₂ to form stable compounds, and oxidative dehydrogenation was the initial step of ethylene and ethane chain, the reaction rate had a great influence on the ignition delay time.

Key words: ethane, ethylene, ignition delay, chemical kinetics

马守涛姜杰孙冰孟瑞佶朱云峰徐伟. 高温高压下乙烷/乙烯着火延迟时间测定和动力学建模[J]. 石油炼制与化工, 2023, 54(7): 34-40.

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