国产660 MW机组汽轮机强制快速冷却技术的应用

Application of Forced Fast Cooling Technology in Domestic 660 MW Steam Turbines

针对国产660MW超临界汽轮机组停机时,汽轮机调节级金属温度、汽缸内壁金属温降速度缓慢的问题,介绍了一种利用锅炉余热进行汽轮机强制快速冷却的技术。该技术在某660MW超临界汽轮机上得到成功应用,不仅可以避免对转子、汽缸产生较大热冲击,不增加汽轮机寿命损耗,而且缩短了机组检修的等待时间,提高了机组的可利用率。

To solve the problem of small cooling rate of metallic areas at governing stage and in turbine cylinder during shutdown of domestic 660 MW supercritical steam turbine units,a forced fast cooling technology is presented by using the waste heat of boiler.The technology has been successfully applied in a 660 MW supercritical steam turbine,which could not only avoid the thermal shock to the rotor and cylinder without increasing the life loss of steam turbine,but also greatly shorten the waiting time for overhaul to improve the availability of the unit.