Impact of steam-equalizing equipment on exhaust steam pressure of 300 MW steam turbine and economic analysis

In view of the uneven problem of steam flow field at the exit of condenser throat of 300 MW steam turbine, a steam-equalizing equipment was installed at the exit of condenser throat. This paper, based on the model and on-site testing results, by using the relevant two-phase flow theory, analyzed the reasons and economics of the lowered exhaust pressure caused by the steam-equalizing equipment. The increase in the heat transfer coefficient and the decrease in the steam resistance, the terminal temperature difference, and the decrease in the inlet pressure of vacuum pump etc. were considered as the main factors which lowered the unit's exhaust pressure. It has been practically proved that to install such equipment is a new effective method to improve the economics of 300 MW unit.