VN型回转式空气预热器转子径向隔板热弹性变形模型

对于目前在役的电厂锅炉，通过降低回转式空气预热器的漏风率提高机组运行经济性，具有较大的节能潜力。回转式空气预热器的VN型设计是在传统设计的基础上，将密封系统作为一个整体考虑，充分利用隔板的热弹性变形，采用机械手段来减少旋转部件和静态部件的间隙，具有漏风低且随时间变化小，可靠性高，维护工作量少等特点；VN型设计是回转式预热器发展过程中一次重要的技术改进，文中研究了回转式空气预热器转子径向隔板热弹性变形的密封问题，建立了热弹性变形的物理模型，结合径向隔板温度场一维分布假设，获得了热弹性变形的分析解，并将变形的计算结果和VN型设计的预留间隙进行了对比，表明该模型是合理的，且具有一定的工程精度。

THERMOELASTIC MODEL FOR DEFORMATION OF THE RADIAL PLATE IN ROTARY REGENERATIVEAIRHEATER

For utility boilers in service,it has great potentials for energy conservation b y reducing air leakage in rotary regenerative airheater to improve efficiency of generator unit.Comparing with traditional methods in designing rotary regenerat ive airheater,VN design considers sealing system as the all and the one,mechanic al technique sufficiently resorting deformation of the radial plate is used to r educe clearance between rotary and fixed parts,it has many virtues of low leakag e,high dependability and less maintenance.VN design is a valuable retrofit in de velopment of rotary regenerative airheater.This paper pay attention to sealing p roblem of the radial plate,a thermoelastic model for deformation of the radial p l ate in rotary regenerative airheater was presented,analytical solutions for ther moelastic deformation was given by one|dimensional temperature profile in radia l plate,the deformation results was compared with the initialization of the plat e in VN design,from which we can conclude that the thermoelastic model is reason able and approximately capable of meeting engineering requirements.