典型汽机事故

13日12时40分起到18时30分． &nbsp;<br/>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;三次手动盘车待转子偏心率下降后，改投电动盘车，转子偏心率升高，并居高不下，在300μm左右。15日19时20分，高压缸温度达145℃，停止盘车，开始做揭缸检查工作。<br/>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;　　四、设备损失情况<br/>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;　　1． &nbsp;转子弯曲最大部位在高压缸喷嘴和平衡汽封处，最大弯曲值0．44mm。<br/>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;　　2．平衡汽封磨损严重，磨损量约1．2mm，磨损部位在下部左侧；高压后汽封的下部左侧磨损约0.30mm；高压第6、7、8级隔板阻汽片下部左侧磨损约0．80- &nbsp;<br/>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;1.OOmm，第9、10级阻汽片下部左侧磨损约0.40-0.60mm； &nbsp;<br/>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;第l、2、3级阻汽片下部左侧容损约0.60--0.80mm.第4、5阻汽片下部左侧有少量磨损。<br/>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;　　3、高压缸后油挡下部左侧和上部左侧局部钨金磨损严重,钨金回油槽磨去一半约1.O0mm,高压缸前油挡钨金齿左侧磨去0．35mm，铜齿磨去约0．45mm。<br/>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;　　五、事故发生扩大的原因<br/>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;　　4月12日16时18分，运行人员在操作#2汽机高压缸法兰加热系统的过程中，漏掉了对高压缸法兰加热左右两侧回汽门的操作(或检查)，使得高压缸左侧法兰加热回汽门开度很小，右侧法兰加热回汽门全开；当16时22分，机长开启高压缸法兰加热电动门投入法兰加热后，从16时27分起。高压缸左、右两侧的法兰的温差开始增大．56分时达100℃(左侧法兰金属温度为150.43℃，右侧为250．45℃)．在高压缸左右温差大的期间,运行监盘人员没有及时发现,因而造成高压缸缸体膨胀不均，转子偏心率增加， &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;高压缸内动静摩擦，轴承油挡磨损,高压转子弯曲。&nbsp;&nbsp;<br/>