Abstract:As the capacity and other parameters of ultra supercritical power unit increase,the cooling time after the shutdown of unit is greatly extended, which strongly influences the overhauling of unit and reduces its utilization time. This paper summarized the operation process of deep sliding parameter shutdown of 660MW ultra supercritical power unit and its announcements, minimized the body temperature of boiler and turbine, and effectively shortened the cooling time of unit, which ensured the safety, stability and reliability of the unit during the process of shutdown.

Keywords:ultra supercritical power unit, deep sliding parameter shutdown, metal temperature