Measurement of thermal conductivity of thermally reactive materials for use in pyrolysis models

IF 2 4区 材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY
Matthew J. DiDomizio, Mark B. McKinnon, Grayson Bellamy
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Abstract

Pyrolysis models are used in the fire science field to simulate the thermal decomposition of materials. These models require knowledge of the kinetic and thermodynamic parameters of an assumed reaction mechanism, and the thermophysical properties of the virgin material and product species. Standard test methods exist for measuring the thermal conductivity of nonreactive materials, but to date no suitable method exists that is compatible with contemporary pyrolysis models and is applicable to thermally reactive materials. In the present study, a modified methodology was presented and evaluated to address this need. The methodology involves a preliminary assessment of thermal stability, followed by a series of tests including: thermogravimetric analysis, differential scanning calorimetry, and laser flash analysis. Once a reaction mechanism has been identified, gram-scale samples of the virgin and stable product species are isolated and independent measurements of thermal conductivity of those species are obtained. The methodology was applied to eucalyptus fiber hardboard, for which a complete set of property data for pyrolysis modeling was obtained. A pyrolysis experiment was then conducted, and that experiment was simulated using a pyrolysis model parameterized with the measured property data. Model predictions of the mass loss rate and temperature rise of a hardboard sample exposed to radiant heat flux of 35 and 60 kW m−2 were found to be a good match to measurements. These results demonstrate the suitability of the property data, the pyrolysis model, and the utility of this approach. This work will serve as a basis for property determination in future pyrolysis studies.

Abstract Image

测量热反应材料的热导率,以用于热解模型
火灾科学领域使用热分解模型模拟材料的热分解。这些模型要求了解假定反应机制的动力学和热力学参数,以及原始材料和产物种类的热物理性质。目前已有测量非反应性材料热导率的标准测试方法,但迄今为止还没有与当代热解模型兼容并适用于热反应性材料的合适方法。本研究提出并评估了一种经过修改的方法,以满足这一需求。该方法包括对热稳定性进行初步评估,然后进行一系列测试,包括:热重分析、差示扫描量热法和激光闪光分析。一旦确定了反应机制,就会分离出克级的原生产物和稳定产物样本,并对这些产物的热导率进行独立测量。该方法适用于桉树纤维硬纸板,获得了一整套用于热解建模的属性数据。然后进行了热解实验,并使用热解模型对该实验进行了模拟。结果发现,模型对暴露在 35 kW m-2 和 60 kW m-2 辐射热通量下的硬纸板样品的质量损失率和温升的预测与测量结果非常吻合。这些结果证明了属性数据、热解模型的适用性以及这种方法的实用性。这项工作将作为今后热解研究中确定特性的基础。
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来源期刊
Fire and Materials
Fire and Materials 工程技术-材料科学:综合
CiteScore
4.60
自引率
5.30%
发文量
72
审稿时长
3 months
期刊介绍: Fire and Materials is an international journal for scientific and technological communications directed at the fire properties of materials and the products into which they are made. This covers all aspects of the polymer field and the end uses where polymers find application; the important developments in the fields of natural products - wood and cellulosics; non-polymeric materials - metals and ceramics; as well as the chemistry and industrial applications of fire retardant chemicals. Contributions will be particularly welcomed on heat release; properties of combustion products - smoke opacity, toxicity and corrosivity; modelling and testing.
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