混凝土全容罐内部温度场等效计算方法研究

Study on equivalent calculation method of the internal temperature field of concrete full containment tank

在火灾或泄漏情况下,混凝土全容罐的内部温度场变化非常复杂,内部温度场直接影响混凝土外罐温度场。准确评估混凝土外罐温度场需要考虑其内部温度场的影响,提出了一个近似内部温度场的等效计算方法,将内部温度场近似按一维传热问题处理,实时求解其近似解,并根据近似解将内部温度场与混凝土外罐之间的热交换等效为对流换热边界,实现了动态考虑内部温度场对混凝土外罐的影响。与火灾试验结果对比验证结果表明所提计算方法有效可行。对混凝土外罐的火灾温度场分析结果表明,该方法既简化了内部温度场的计算,又保证了混凝土外罐温度场的计算精度,能为工程设计提供客观准确的依据。

In the case of fire or leakage,the internal temperature field of concrete full containment tank changes very complicatedly,and the internal temperature field directly affects the temperature field of the concrete outer tank.In order to evaluate the temperature field of concrete outer tank accurately,the influence of the internal temperature field should be considered.This paper proposes an equivalent calculation method for approximating the internal temperature field,which treats the internal temperature field approximately as a one-dimensional heat transfer problem,and solves the approximate solution in real time.According to the approximate solution of the internal temperature field,the heat exchange between the internal temperature field and the concrete outer tank is equivalent to the convective heat transfer boundary,and the influence of internal temperature field on concrete external tank is considered dynamically.Compared with the fire experiment,the results show that the method is effective and feasible.By analysing the fire temperature field of the concrete outer tank,the results show that the method not only simplifies the calculation of the internal temperature field,but also ensures the accuracy of the calculation of the temperature field of the concrete outer tank,which can provide an objective and accurate basis for engineering design.