Taking a 600 MW coal fired unit in a factory as the research object

aiming at the vacuum system of condenser

analysis of the phenomenon and cause of the low vacuum degree after the start of the unit. According to the inspection of the operating environment

analysis the structure and influence of the shaft seal system

fault diagnosis and accident treatment

raise the vacuum in time to the best state

ensure the safe and economical operation of the unit. After analysis

there are two main reasons for the low vacuum of the condenser: The negative pressure part valve leaks

Shortage of steam supply for the steam turbine. In view of the above reasons

the relevant treatment measures were taken

Suggestions for operation and maintenance of condenser vacuum system are put forward.