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首页> 外文期刊>Experimental Thermal and Fluid Science: International Journal of Experimental Heat Transfer, Thermodynamics, and Fluid Mechanics >Burning of weathering and emulsified oil spills
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Burning of weathering and emulsified oil spills

机译：燃烧风化和乳化溢油

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In previous works, we described small-scale experiments that dealt with the combustion of fuel slicks on water and provided some features of the events that can lead to boilover. The experiments showed that the violent-eruptive vaporization may be due to boiling nucleation near the heating fuel/water interface that has been superheated, and the mechanisms causing this phenomenon to occur have been discussed. If an attempt is made to burn crude oils, which are multicomponent fuels, the problem becomes complicated with the "weathering" of slicks (progressive evaporation of lighter volatiles) and the possibility to have water-in-oil emulsions. The objective of the present work is to study how the combustion of crude oil-layers floating on water is influenced by the aging of oil (degree of oil evaporation) and the formation of emulsions. The experiments are dealing with burning rate, time to the start of boilover. burned mass ratio and boilover intensity. The results are discussed in relation to the main factors influencing the phenomenon: initial oil-layer thickness and pool diameter. The behavior of weathered crude oil agrees closely with the general behavior of single oils with increasing boiling point (the surface temperature will increase with weathering as the residual crude oil becomes less volatile). In contrast, the case of emulsions is more complex and somewhat difficult to model (thermal breakage of emulsified layers, boilover difficult to discern). Finally, the work is complemented by a study of smoke production during the pre-boilover phase. The procedure permits measurements of exhaust gas composition by means of a flow-through system. Results show that weathering increases both yield of soot and CO but that emulsification decreases these yields. The former effect is due to a residual liquid progressively less volatile, the later to vaporised water interacting chemically in the flame. (C) 2004 Elsevier Inc. All rights reserved.
机译：在以前的工作中，我们描述了处理水上浮油燃烧的小型实验，并提供了可能导致沸腾的一些事件特征。实验表明，猛烈的气化汽化可能是由于过热的加热燃料/水界面附近的沸腾形核所致，并且已经讨论了导致这种现象发生的机理。如果试图燃烧作为多组分燃料的原油，则浮油的“风化”（轻质挥发物的逐步蒸发）和油包水型乳液的可能性将使问题变得复杂。本工作的目的是研究浮在水面上的原油层的燃烧如何受到油的老化（油的蒸发度）和乳化液的形成的影响。实验涉及燃烧速率，开始沸腾的时间。燃烧质量比和沸腾强度。讨论了与影响该现象的主要因素有关的结果：初始油层厚度和油藏直径。风化原油的行为与沸点升高的单一油的一般行为非常吻合（随着残余风的挥发，地表温度会随风化而升高）。相反，乳液的情况更为复杂，并且很难建模（乳化层的热破损，沸腾难以辨别）。最后，这项工作得到了沸腾前阶段烟雾产生的研究的补充。该程序允许通过流通系统测量废气成分。结果表明，风化增加了烟灰和一氧化碳的产量，但乳化降低了这些产量。前一种作用是由于残留液体的挥发性逐渐降低，而后一种是由于汽化水在火焰中发生化学相互作用。 （C）2004 Elsevier Inc.保留所有权利。

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