Flame inhibition by ferrocene and blends of inert and catalytic agents
Flame inhibition by ferrocene and blends of inert and catalytic agents
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DOI：
10.1016/s0082-0784(00)80722-5
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发表时间：
2000-01-01
影响因子：
3.4
通讯作者：
Tsang, W
中科院分区：
文献类型：
--
作者：
Linteris, GT;Rumminger, MD;Tsang, W
灭火剂CF 3Br的生产已被禁止，并且很难找到具有其所有理想特性的替代品。已发现五羰基铁比CF 3Br的有效性高出几个数量级，但它易燃且毒性很高。二茂铁[Fe（C5 H5）（2）]的毒性和可燃性比Fe（CO）（5）小得多，也可用于将铁引入火焰中。我们提出了第一个实验数据和数值模拟的二茂铁抑制火焰，并发现它的行为类似于Fe（CO）（5）。一个二茂铁的摩尔分数为200 ppm的轻微预热甲烷/空气预混火焰的燃烧速度减少了两个因素，和有效性急剧下降，在较高的摩尔分数。对于氧摩尔分数较高的空气，燃烧速度的减少是less. We还提供了实验数据和模型的二茂铁与CO，或CF 3 H混合火焰。热作用剂CO2与二茂铁的组合减轻了在较高摩尔分数下单独二茂铁所经历的有效性损失。由1.5%二茂铁在98.5%CO2中组成的试剂在实现燃烧速度降低50%方面与CF 3Br一样有效。同样，如果将0.35%二茂铁添加到CO2中，则实现50%降低所需的CO2少四倍。相比之下，向氢氟烃CF 3 H中加入0.35%的二茂铁使实现燃烧速度降低50%所需的CF 3 H仅降低了约25%。热力学平衡计算预测，铁/氟化物化合物的形成可以降低铁类氧化物和氢氧化物中间体的浓度，这被认为是负责催化自由基重组循环。
The production of the fire suppressant CF3Br has been banned, and finding a replacement with all of its desirable properties is proving difficult. Iron pentacarbonyl has been found to be up to several orders of magnitude more effective than CF3Br, but it is flammable and highly toxic. Ferrocene [Fe(C5H5)(2)], which is much less toxic and flammable than Fe(CO)(5), can also be used to introduce iron into a flame. We present the first experimental data and numerical modeling for flame inhibition by ferrocene and find it to behave similarly to Fe(CO)(5). A ferrocene mole fraction of 200 ppm reduced the burning velocity of slightly preheated premixed methane/air flames by a factor of two, and the effectiveness dropped off sharply at higher mole fractions. For air with a higher oxygen mole fraction, the burning velocity reduction was less. We also present experimental data and modeling for flames with ferrocene blended with CO, or CF3H. The combination of the thermally acting agent CO2 with ferrocene mitigated the loss of effectiveness experienced by ferrocene alone at higher mole fractions. An agent consisting of 1.5% ferrocene in 98.5% CO2 performed as effectively as CF3Br in achieving a 50% reduction in burning velocity Likewise, four times less CO2 was required to achieve the 50% reduction if 0.35% ferrocene was added to the CO2. In contrast, addition of 0.35% ferrocene to the hydrofluorocarbon CF3H reduced the CF3H required to achieve the 50% reduction in burning velocity by only about 25%. Thermodynamic equilibrium calculations predict that the formation of iron/fluoride compounds can reduce the concentrations of the iron-species oxide and hydroxide intermediates which are believed to be responsible for the catalytic radical recombination cycles.