十万空分装置用汽轮机启机挠度计算

Switch-on Deformation Analysis of 100 000m^3/h Air Separation Unit Steam Turbine

大型工业驱动用汽轮机为了提高效率一般采用全周进汽,但启机时调节汽阀的开启顺序会带来汽缸上下半的温差,进而产生汽缸的热变形。以十万空分装置用汽轮机为研究对象,针对汽缸上半先进汽和汽缸下半先进汽这两种进汽顺序,采用热固耦合的有限元方法计算汽缸在启机过程中由于温差和重力产生的变形,并提出一种表征动静间隙的方法,从而给出汽轮机本体启机过程对动静间隙的设计要求,通过对比发现汽缸下半先进汽比汽缸上半先进汽需要的动静间隙更小。

The large-scale industrial driving steam turbine often adapts the 360°admission to improve efficiency, but the admission order will cause the non-uniform temperature of the upper half casing and the lower half casing, which will result in the thermal deformation of the casing. This paper will analysis the casing deformation of 100 -00m3/h Air Separation Unit Steam Turbine in the switch-on process with the thermal-structure coupling finite element method, including the upper- first admission and the lower-first admission. Furthermore,this paper will put forward a method of indicating the clearance of the active cell and the stator to quantize the influence of switch-on structure on the design of clearance. As a result,the clearance in need of the lower-first admission is smaller than the one of the upper-first admission.