Direct air cooled condenser, also known as ACC system, refers to the use of mechanical ventilation to make the exhaust gas of turbine condense directly in the finned tube condenser, and exchange heat between air and steam. The process flow is that the exhaust steam of the steam turbine flows into the outdoor air condenser through the thick exhaust pipeline, the fan makes the air flow through the outer surface of the cooler, condenses the exhaust steam into water, and the condensed water is pumped back to the boiler.