钢筋混凝土烟囱基础温度场数值分析及简化计算方法

Numerical analysis and simplified calculation method of temperature field about foundation of reinforced concrete chimney

采用均匀设计法,选取烟囱基础的24组不同几何参数及物性参数,建立了烟囱基础的有限元分析模型,分析了烟囱基础温度场的分布情况.数值模拟结果与试验结果相比较表明模拟结果是正确的.并对基础内壁最高温度进行了多元线性回归,得到了基础内壁最高温在烟气温度、由内壁内表面计算的基础内径、基础内衬内表面计算的基础环壁埋深、隔热层厚度、隔热层导热系数、土层导热系数等6个因素影响下的拟合特性,为烟囱基础温度场的计算提供了一个简单可行的方法.

The uniform design method was adopted and the twenty-four groups of ditterent geometric and physical parameters were chosen. The finite element model was built. Comparison between the simulation results and the test results proved that the simulation results were correct. The distribution of the temperature field of the chimney foundation was analyzed. The multivariate linear regression was performed at the highest temperature of the inner wall of the chimney foundation by the numerical calculated results. The fitting property of the highest temperature with six influence factors was obtained. These factors are the gas temperature, the inner diameter calculated from the inner surface of the inner liner, the foundation depth, the thickness and the conductivity coefficient of the heat-insulated barrier and the conductivity coefficient of the soil. It provides a simple method for the calculation of the temperature field of the chimney foundation.