电站锅炉过热器炉管高温烟气冲蚀数值模拟研究

Numerical Simulation of High-Temperature Smoke Erosion for Power Station Boiler Superheater Tubes

炉管高温烟气冲蚀是电站锅炉主要的失效模式之一,本文首先根据API 581技术模块建立方法原则提出了电站锅炉炉管高温烟气冲蚀技术模块,然后针对浙江省某电站锅炉末级过热器,对技术模块中最重要的参数——烟气冲蚀磨损率计算方法展开研究,最终采用有限元模拟方法对大量过热器炉管模型进行了二维和三维数值模拟,确定了过热器内部流场分布和高温烟气流场最大速度和磨损率。通过本文研究,比较全面的掌握了过热器流场分布规律,为高温烟气冲蚀技术模块次因子的计算奠定了良好的基础。

High-temperature smoke erosion is one of the main failure modes of power station boiler, according to the establishment principles of technology modules in API 581, in this paper, the technology modules of high-temperature smoke erosion was proposed. And then, aiming at the last final superheater tubes of a power station boiler in Zhejiang province, the calculation method of the smoke erosion rate which is the most important parameters in the technology module was researched. Two-dimensional and three-dimensional numerical simulations of superheater tube were carried out by FEM simulation. The flow field distribution in the superheater was given, and the maximum speed and erosion rate of the high-temperature smoke flow field were determined. The research of this paper lays a good foundation for calculating the secondary factor of the high-temperature smoke erosion technology modules.