超临界600MW机组汽轮机汽封改造及通流调整  

Seal retrofitting and flow passage adjustment for steam turbine in a supercritical 600 MW unit

作　　者：王新宇[1] 秦书文 

机构地区：[1]北方联合电力有限责任公司,内蒙古呼和浩特010020 [2]上都发电有限责任公司,内蒙古锡林郭勒027200

出　　处：《热力发电》2013年第5期90-92,95,共4页Thermal Power Generation

摘　　要：介绍了DAS汽封的特点及其与常规铁素体汽封的区别,将该汽封应用于某超临界660MW机组汽轮机,并经过振动和热力性能试验验证表明,该汽轮机通过DAS汽封改造和通流间隙按照接近下限精细化调整后,首次起动最大轴振动值为58.91μm,满负荷最大轴振动值为73.19μm,均小于达标值(76μm);汽轮机热耗比未改造前低115.2kJ/(kW·h),热耗下降率1.45%,煤耗下降4.64g/(kW·h)。The characteristics of the DAS steam seal and its difference from the conventional ferrite seal were presented.The vibration and thermal performance tests for steam turbine in a supercritical 660 MW unit indicated that,after fine adjustment of the flow passage clearance according to the lower limit,the maximum shaft vibration amplitude of the turbine applied with the DAS steam seal was 58.91 μm during the first startup,and 73.19 μm during the full load operation,which were both lower than the standard value of 76 μm.The heat consumption of the turbine dropped by 115.2 kJ/(kW·h),and the falling rate of heat consumption was 1.45%.The coal consumption reduced by 4.64 g/(kW·h).

关 键 词：超临界 660 MW机组 汽轮机 汽封 通流 间隙调整 热耗 

分 类 号：TK263[动力工程及工程热物理—动力机械及工程]