Influence of the ignition delay time on the explosion parameters of hydrocarbon-air-oxygen mixtures at elevated pressure and temperature
Influence of the ignition delay time on the explosion parameters of hydrocarbon-air-oxygen mixtures at elevated pressure and temperature
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DOI：
10.1016/j.proci.2004.08.262
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发表时间：
2005-01-01
影响因子：
3.4
通讯作者：
Pasman, HJ
中科院分区：
文献类型：
--
作者：
Pekalski, AA;Terli, E;Pasman, HJ
燃烧现象随着发生的条件的变化而变化。对这些现象的适当理解和可靠的预测，包括重要的爆炸指数（例如，易燃性限制，爆炸压力），才能实现工业流程的安全和最佳性能并创建新的应用程序。为此，我们研究了停留时间对II-丁烷 - 氧合混合物的上述参数的影响和用于产生乙烯氧化物的典型混合物：rnethane-乙烯 - 氧气，重点是升高条件如何影响上爆炸限制和爆炸限制和爆炸限制压力。初始条件升高（t = 230度C，p = 4-16 bar）导致在低温氧化机制（LTOM）的状态下发生预点击反应。这些反应在点火之前改变了混合物组成。对于研究了两种混合物，由于预点击反应而导致的初始混合物组成中的这些变化会导致不同的爆炸压力。这很重要，因为压力上升被用作点火标准。因此，根据点火之前的停留时间，可能会将所研究的混合物分类为易燃或不可易变。将实验结果与使用详细反应动力学模型进行的理论计算进行了比较。 （c）2004年燃烧学院。由Elsevier Inc.发布的所有权利保留。
Combustion phenomena change as the conditions in which they are occurring change. Proper understanding and reliable prediction of these phenomena, including important explosion indexes (e.g., flammability limits, explosion pressures), are required for achieving safe and optimal performance of industrial processes and creating new applications. To this end, we investigated the influence of the residence time on aforementioned parameters of ii-butane-oxygen mixture and a typical mixture for ethylene oxide production: rnethane-ethylene-oxygen, focusing on how elevated conditions affect the upper explosion limit and the explosion pressure. Elevated initial conditions (T = 230 degrees C, P = 4-16 bar) cause pre-ignition reactions to occur in the regime of the low temperature oxidation mechanism (LTOM). These reactions change the mixture composition prior to ignition. For both mixtures investigated, these changes in the initial mixture composition, due to pre-ignition reactions, result in a different explosion pressure. This is significant, because pressure rise is used as the ignition criterion. Consequently, a different classification of the investigated mixtures, as flammable or non-flammable, is possible, depending on the residence time prior to ignition. The experimental results are compared with theoretical calculations performed using detailed reaction kinetic models. (c) 2004 The Combustion Institute. Published by Elsevier Inc. All rights reserved.