河北省高等学校科学技术研究项目 (Z02020182);邯郸市科技项目 (19422121008-37);河北省自然科学基金青年项目(E2020502053)
空预器作为电厂主要辅机设备,在运行过程中不可避免地产生膨胀和位移,对机组安全运行造成潜在危害。为此,在采用差分法获得温度场的前提下,对启炉过程工况变化时空预器进行有限元分析,获得空预器转子、外壳的应力场和位移场变化规律,研究发现转子外圈所发生的膨胀位移量不同,最大膨胀位移量发生在周向方向烟气出口处的转子位置,该位置的转子上顶点最大变形量约为36.65 mm,转子下顶点最大变形量约为26.86 mm。对径向密封碰磨分析确定靠近中心筒位置的周向烟气侧出口位置冷端径向密封可能会发生碰撞,在停机检修过程或运行过程适当调整扇形板运行位置,避免碰磨同时,减少径向漏风。
As the main auxiliary equipment of power plants, the air preheater inevitably generates expansion and displacement during operation, which poses potential hazards to the safe operation of the unit. Therefore, under the premise of obtaining the temperature field using the difference method, the finite element analysis was conducted on the preheater during the start-up process to obtain the stress and displacement fields of the rotor and shell of the preheater. The results show that the expansion displacement of the outer ring of the rotor is different and the maximum expansion displacement occurs at the rotor position at the circumferential flue gas outlet. The maximum deformation of the top vertex of the rotor at this position is about 36.65 mm and that of the lower vertex of the rotor is approximately 26.86 mm. By analyzing the radial seal rubbing, it is determined that the cold end radial seal at the outlet position of the circumferential flue gas side near the central cylinder may collide. During shutdown maintenance or operation, the appropriately adjustion of the operating position of the fan plate can avoid rubbing and reduce radial air leakage.