Effect of methanol on explosion limits of propane-oxygen mixture

doi:10.11949/0438-1157.20201424

Abstract

Abstract:

To explore the oxidation characteristic of the alternative fuel propane/methanol mixture, the explosion limit was used to study the negative temperature coefficient (NTC) response characteristics of methanol to propane/oxygen mixture. The results show that the pressure of the lower turning points steadily increases with the increase of methanol mole fraction. The temperatures of the lower turning points show no noticeable variation. However, the methanol has almost no effect on the temperatures and pressures of upper turning points. In general, the NTC region is shrunken to high-pressure region with the increase of methanol mole fraction. In addition, the temperature, pressure and heat release rates of the main reactions profiles of the non-explosion, cool flame, and hot flame conditions, under different explosion scenarios are compared. Furthermore, to elucidate the key control mechanism, sensitivity analyses of the turning points are performed.

Key words: hydrocarbons, alcohol, reaction kinetics, explosion limit, negative temperature coefficient, turning points

摘要：

为探究替代燃料丙烷/甲醇混合气的氧化反应特性，利用爆炸极限开展了甲醇对丙烷/氧气混合气的负温度系数（NTC）响应特性的研究。结果表明：在NTC区域，下拐点的压力随着甲醇摩尔分数的增加而升高，但下拐点的温度几乎保持不变。然而上拐点的温度与压力随着甲醇摩尔分数的增加没有明显变化。整体而言，随着甲醇摩尔分数的增加，丙烷/氧气混合气的NTC区域不断减小并向高压区域移动。对比分析了不同爆炸状态下，即无爆炸、冷焰以及热焰状态，混合气的温度、压力以及主要组分变化，并获得了影响温度变化的主要基元反应。此外，对爆炸极限曲线的NTC区域上、下拐点进行了敏感性分析，确定影响拐点状态的主要基元反应。

关键词: 碳氢化合物, 醇, 反应动力学, 爆炸极限, 负温度系数, 拐点

CLC Number:

TK 16

YU Ruiguang, LIU Jie, MA Biao. Effect of methanol on explosion limits of propane-oxygen mixture[J]. CIESC Journal, 2021, 72(6): 3411-3420.

于瑞广, 刘杰, 马彪. 甲醇对丙烷/氧气混合气爆炸极限的影响[J]. 化工学报, 2021, 72(6): 3411-3420.

Figures/Tables 10

Fig.1 Comparison of the calculated and experimental cool flame explosion limit of equimolecular C3H8/O2 mixtures

Fig.2 Effect of induction period on the cool flame limits of stoichiometric C3H8/O2 mixtures

Fig.3 Effect of methanol on the cool flame and hot flame limits of stoichiometric C3H8/ O2 mixtures

Fig.4 Comparison of the temperatures and pressures under non-explosion, cool flame and hot flame regions

Fig.5 Mole fractions of the main species under non-explosion, cool flame and hot flame regions

Fig.6 Heat release rates of the main reactions

Fig.7 The forward and backward reactions ratios of the HO2 main reactions at 650 K,5×104 Pa under C3H8/O2 and C3H8/(30%)CH3OH/O2 mixtures

Fig.8 The reaction pathway analysis of C3H8/O2 mixtures (Blue symbols) and with 30% CH3OH addition of C3H8/O2 mixtures (Red symbols) at (700 K, 5×104 Pa) condition and, C3H8/O2 mixtures (Green symbols) and with 30% CH3OH addition of C3H8/O2 mixtures (Violet symbols) at (700 K, 1×105 Pa) condition

Fig.9 The sensitivity of the main reactions on the lower turnover point for C3H8/CH3OH/O2 mixtures

Fig.10 The sensitivity of the main reactions on the upper turnover point for C3H8/CH3OH/O2 mixtures

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