核电厂封闭空间内火灾火源功率预测模型及其实验验证

发布时间：2018-05-11 13:06

本文选题：核电火灾 + 火源模型修正　；参考：《核科学与工程》2017年05期

【摘要】：针对核电厂防火设计中使用的火灾区域模型模拟软件CFAST(Consolidated Model of Fire Growth and Smoke Transport)在火源模型方面的缺陷,提出耦合火源与热烟气层的热反馈相互作用的火源计算模型。为了验证新的火源功率计算模型的可靠性,基于核电厂保守性原则,分别进行了开放空间和封闭空间内横向四层电缆桥架电缆燃烧火灾实验。通过比较模型预测的火源功率和温度与实验测量值得到:相对于现有的区域模型软件的火源计算模型,新的火源功率计算模型使得整个火灾过程中火源的热释放速率预测精确度提高了11%;特别是在电缆火焰横向蔓延阶段,精确度提高了24.7%。更重要的是:因为区域模型软件CFAST火源计算模型忽略了烟气的热反馈作用,导致其基于开放空间火源热释放速率测量值计算的热烟气层温度小于实验测量值,该温度数据如用于防火设计将导致缺乏保守性;而修正后的火源计算模型通过耦合火源与热烟气层热反馈的相互作用,使得温度计算结果趋势性的大于实验测量值,使得预测结果趋于精确和保守。
[Abstract]:Aiming at the defects of the fire source model simulation software CFAST(Consolidated Model of Fire Growth and Smoke Transport) used in the fire prevention design of nuclear power plant, a fire source calculation model for coupling the thermal feedback interaction between the fire source and the hot flue gas layer is proposed. In order to verify the reliability of the new fire source power calculation model, based on the conservatism principle of nuclear power plant, the fire experiments of transverse four-layer cable bridge cable in open space and in closed space were carried out. By comparing the predicted power and temperature of the fire source with the experimental measurements, it is obtained that compared with the existing regional model software, the calculation model of the fire source is obtained. The new power calculation model improves the accuracy of heat release rate prediction in the whole fire process by 11 percent, especially in the transverse spread of the cable flame, the accuracy of which is improved by 24.7. More importantly, because the regional model software CFAST fire source calculation model neglects the heat feedback effect of smoke, the temperature of hot flue gas layer calculated based on the measurement value of heat release rate of open space fire source is smaller than the experimental value. If the temperature data is used in the fire prevention design, it will lead to a lack of conservatism, and the modified fire source calculation model can make the temperature calculation result trend larger than the experimental measured value by coupling the fire source with the thermal feedback of the hot flue gas layer. The prediction results tend to be accurate and conservative.
【作者单位】：广州中国科学院工业技术研究院核电火灾安全联合实验室;中广核工程有限公司;中国科学技术大学火灾科学国家重点实验室;
【分类号】：TM623;TU998.1

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