典型汽机事故

　　　设备事故调查报告书(摘要) &nbsp;<br/>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;　　一、设备规范<br/>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;　　汽轮机为亚临界一次中间再热、单轴三缸三排汽、冲动凝汽式汽轮机，型号为k一300-170—3，额定出力为300MW。高压缸主汽门前蒸汽压力为16．2MPa、温度540℃，高压缸排汽压力为3．88MPa、温度333℃。汽轮机高中压汽缸分缸布置，高压缸采用双层缸加隔板套型式，蒸汽的流向设计成回流式，高中压缸设有法兰和螺栓加热装置，高压转子采用整体锻造式结构。<br/>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;　　二、事故前工况<br/>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;　　#2汽轮机用中压缸冲转，机组的转速为1200转/分， &nbsp;<br/>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;#2机B级检修后第一次启动，处中速暖机状态；高压缸正在暖缸．高压缸法兰及螺栓加热已投入；主汽及再热蒸汽温度压力正常，各缸体膨胀、差胀、振动值均在正常范围。<br/>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;　　三、事故经过<br/>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;　　4月11日，#2机组B级检修结束后，经过一系列准备与检查后，#2机于4月12日15时55分开始冲转，15时57分机组冲转至500rpm，初步检查无异常。16时08分，升速至1200rpm，中速暖机，检查无异常。16时15分，开启高压缸倒暖电动门，高压缸进行暖缸。16时18分，机长吴X令副值班员庄XX开高压缸法兰加热进汽手动门，令巡检员黄X开高、中压缸法兰加热疏水门，操作完后报告了机长。16时22分，高压缸差胀由16时的2．32mm上升2．6lmm，机长开启高压缸法兰加热电动门，投入高压缸法兰加热。1&nbsp;&nbsp;<br/>