600 MW超临界汽轮机低压缸胀差偏大原因分析及控制

针对广东珠海金湾发电有限公司2台600 MW超临界凝汽式汽轮机运行中低压缸胀差一直偏高,超过了厂家规定的安全运行值的情况,分析了汽轮机相关运行参数变化对低压缸胀差的影响,从而总结出低压缸胀差的运行控制策略.经过运行实践证明：采用这些运行控制手段有效地控制汽轮机低压缸胀差,从而保证了机组安全运行.

Analysis and Control on Large Differential Expansion of Low Pressure Cylinder in a 600 MW Supercritical Steam Turbine

To solve the problem existing in the 2 × 600 MW supercritical steam turbines of Guangdong Zhuhai Jinwan Power Generation Co., Ltd. that the differential expansion of low pressure cylinder has exceeded its safety value specified by the manufacturer, an analysis was conducted to the influece of relative operation parameters of steam turbine on the differential expansion value, so as to work out the control strategy for the low pressure cylinder differential expansion. Practice have proved the methods to be effective in controlling the differential expansion of low pressure cylinder, and therefore safety operation of the unit is guaranteed.