The two most important parameters to affect the performance and fire safety of a chimney are its insulation properties and the temperature distribution across its layers. When designing a chimney, one needs to consider both the normal conditions of its everyday exploitation as well as such emergencies as soot fire. Soot fire may cause the temperature inside a chimney flue to reach 1000 °C. This is why it is important that a chimney is designed and built in a way that prevents ignition of the remaining structural elements of a building in case of soot fire. Other important issues to consider include temperatures of the chimney's individual layers, which regulate the draft and thermal radiation during its exploitation. It is also worth considering a number of flammable (wooden) structural elements often located in the vicinity of a chimney. For the purpose of this work, in order to determine the temperature distribution and heat radiation of a three-layer steel chimney with an air layer, the author conducted Computational Fluid Dynamics (CFD) analysis. The numerical analysis was carried out for flue gas temperatures ranging 100–400 °C in individual layers of a chimney with special consideration of the cladding. The analysis also involved soot fire conditions, i.e. a temperature of 1000 °C, taking into consideration temperatures of the chimney cladding and a wooden structure that was heated through thermal radiation. The results of the analyses were compared with the findings of an experimental measurement. The conclusions of the numerical analysis are significant for chimney designers. The obtained data and the generated model may be used to conduct fire safety assessments of other chimneys of this type that are already in use.

影响烟囱性能和消防安全的两个最重要的参数是其烟囱的隔热性能和整个烟囱各层的温度分布。设计烟囱时，既需要考虑其日常开采的正常条件，也要考虑烟尘燃烧等紧急情况。烟尘着火可能会导致烟囱烟道内部的温度达到1000°C。这就是为什么设计和建造烟囱以防止在烟尘燃烧时防止建筑物其余结构元件着火的原因很重要。其他要考虑的重要问题包括烟囱各个层的温度，这些温度调节吃水深度和热辐射在其开发过程中。还值得考虑通常位于烟囱附近的许多易燃（木质）结构元件。出于这项工作的目的，为了确定具有空气层的三层钢烟囱的温度分布和热辐射，作者进行了计算流体动力学（CFD）分析。进行了数值分析烟囱的各个层中的烟气温度范围为100–400°C，并特别考虑了包层。该分析还涉及烟尘着火条件，即温度为1000°C，其中考虑了烟囱包层和通过热辐射加热的木质结构的温度。将分析结果与实验测量结果进行比较。数值分析的结论对烟囱设计者具有重要意义。所获得的数据和所生成的模型可以用于对已经使用的其他这种类型的烟囱进行消防安全评估。