Abstract:In view of the current situation that the condensate temperature of low-temperature economizer is unable to reach the operation requirements and that the main engine shaft seal is large,the water temperature requirements of the low-temperature economizer are satisfied by adding the overflow cooler of shaft seal and recovering the overflow heat energy of main engine to heat the condensate water.At the same time,the control logic,washing strategy and commissioning scheme of the shaft seal overflow cooler are designed,and the steam purge of the water side of the low-temperature economizer is carried out in advance to meet the water quality requirements.After successful commission,the comprehensive efficiency is remarkable and the expected annual income reached 2.98 million.