论文部分内容阅读
1号机系31—25—7型,制造厂编号第26台。1971年4月投产。一、事故概况及处理1、投产后运行28天,因电机烧毁,4月30日停机。7月30日揭缸检查,发现第12压力级叶片距叶顶80～130mm处严重弯曲变形18片,轻度变形33片,裂纹5片。裂纹部位在进汽边顶部40～130mm,裂纹最多有6条,最长11mm。同时发现末三级叶片频率均有所下降。第十压力级一般下降4～6周/秒,最大12周/秒;第十一,十二压力级频率也下降4～5周/秒。处理措施:①变形者加热校正,裂纹打磨去除,找平衡。②机内疏水改进:将9～10压力级隔板套疏水孔原φ8mm×1改为φ15mm×3;第十一压力级隔板集水环疏水孔原有φ20mm×10不动;第十二压力级隔板底部由原孔φ15
No. 1 machine type 31-25-7, No. 26 factory number. Put into operation in April 1971. First, the accident profile and processing 1, running 28 days after commissioning, due to motor burnout, April 30 downtime. July 30 uncovering cylinder inspection and found that the first 12 pressure-level leaves from the top of the blade at 80 ~ 130mm serious bending deformation 18, slightly deformed 33, crack 5. Crack in the top of the steam into the top 40 ~ 130mm, cracks up to 6, the longest 11mm. At the same time, the frequency of the last three leaves was decreased. Tenth pressure level generally dropped 4 to 6 weeks / second, the maximum 12 weeks / second; the eleventh, twelve pressure-level frequency also dropped 4 to 5 weeks / second. Measures: ① deformation distortion correction, crack removal to find a balance. ② machine hydrophobic improvement: the pressure of 9 to 10 diaphragm sets of hydrophobic hole original φ8mm × 1 to φ15mm × 3; eleventh pressure level diaphragm collector ring hydrophobic hole original φ20mm × 10 does not move; twelfth The bottom of the pressure-level diaphragm consists of the original hole φ15