Startup Sequence and Troubleshooting of 1 000-MW Double Reheat Steam Turbine

Based on the actual tuning process of the steam turbines in the second-phase project of Guodian Taizhou Power Plant, the startup procedures of the 1 000-MW ultra-supercritical turbines with double reheat cycles manufactured by Shanghai Turbine Company is presented, and the problems exposed in the process are analyzed with the corresponding solutions proposed, such as large exhaust steam temperature deviation, long warm-up time, high LP outer casing temperature and unsuccessful double casing startup. In addition, some control logics and the startup parameters of steam temperature and pressure as well as governing valve opening are optimized, which makes the turbine operation more energy-efficient with ultra-low emissions. This case can provide applicable guidance for the tuning and trial operation of double reheat ultra-supercritical steam turbines.