摘要：高温烟气的忍耐是有限的，一方面火灾产生的烟气含有其他有毒成分会使人员中毒；另一方面烟气的遮光性不仅让人员逃生变得困难，也给施救人员带来不便。因此烟气是人员逃生的主要障碍，研究火灾的烟气扩散风险分析，并制定出合理的应急逃生疏散路线是很必要。

首先，了解海洋平台火灾烟气的特点以及危害提出研究烟气扩散风险分析的意义。通过查阅相关CFD的资料对烟气扩散进行理论分析，并且确定适合本文后续模拟计算所需的数学模型、离散方法。然后通过现存的平台结构，合理简化模型，对模型进行网格的划分。基于不同的网格方案的对比，从优选择相对高质量的网格为后续的模拟计算做准备。最后，使用Fluent软件结合第二章所确定的数学模型与离散方法模拟平台烟气扩散。本次模拟为稳态，使用K-epsilon模型和组分输运模型。目的在于追踪烟气的扩散路径。

以下为本文主要研究的几个方面：

（1）通过改变风速来分析这个因素对烟气扩散的影响。结果表明：风速对烟气的扩散影响很明显，随着风俗速的提高，利于烟气的扩散。

（2）通过给定风速为1m/s时，改变风向研究烟气的扩散。结果表明:当风从两个45度侧向吹风时，相比于其他的情形，平台上烟气聚集比较集中。

（3）通过对比不同方向烟气的集中区域，综合制定出一条能够最大化避开这些烟气集中区域的应急逃生路线。

关键字:烟气扩散,K-epsilon模型，组分输运，逃生，风速，风向

Abstract：Marine drilling platform is mainly used for oil and gas development, there are many flammable and explosive materials on the platform, it is extremely easy to fire in the offshore platform. If a fire accident occurs on a sea drilling platform, it will result in huge property damage and casualties. In the event of a fire will produce a lot of smoke. Flue gas with high temperature, toxic, shading these three characteristics. Human tolerance for high temperature flue gas is limited. The Flue gas generated by the fire contains other toxic gases that can cause poisoning. The Flue gas characteristics of the shading is not only easy to escape people, but also to the rescue personnel inconvenience. Flue gas is a major obstacle to the escape of a person in the event of a fire. Therefore, it is necessary to study the risk analysis of flue gas diffusion and to develop a reasonable evacuation route.

First of all, to understand the characteristics of the offshore platform fire smoke and the harm proposed to study the significance of flue gas diffusion risk analysis. The theoretical analysis of flue gas diffusion is carried out by referring to the relevant CFD data, and the mathematical model and discrete method suitable for the subsequent simulation are determined.

Through the existing platform structure to rationalize the model. And the grid is pided into models. Based on the comparison of different grid schemes, prepare for a relatively high quality grid for subsequent simulation calculations.

Finally, using the Fluent software combined with the mathematical model determined by the second chapter and the discrete method simulation platform flue gas diffusion. This simulation is steady state using the K-epsilon model and the component transport model .The purpose is to track the diffusion path of flue gas.

The following are the main aspects of this paper:

(1) The effect of this factor on the flue gas diffusion is analyzed by changing the wind speed. The results show that the influence of wind speed on the diffusion of flue gas is obvious, and the diffusion of flue gas is beneficial with the increase of customs speed.

(2) When the wind speed is 1m / s, change the wind direction to study the  diffusion of flue gas. The results show that when the wind blows from two 45 degrees side wind side, compared with other cases, the flue gas accumulation on the platform is concentrated.