Compared with the conventional single-reheat units

the double-reheat units has disadvantages of high starting parameters and complicate systems

which propose higher demands for the start-up process. Thus

by taking the 1 000 MW double-reheat unit in Huaneng Laiwu Power Plant as the research object

the key steps of the startup process and the pre-start check contents were investigated to put forward the corresponding control strategies. The result shows that

the cylinder exhausting temperature

the gland seal system and the lubricating oil system are the key factors affecting the start-up process. Uniformly controlling the temperature rise of each component during the start-up process to meet the X criterion and stress limit is one of the key points. Reasonable flushing of the lubricating oil system and correct adjustment of throttle valves directly affect the success of start-up process. The discussions for the key points of the gland seal control system ensure the safety and stability of the gland seal system. The above scheme can provide reference for start-up process of the same type double-reheat units.