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.

Because of the different regions in China, the climate conditions are quite different. For example, temperature, humidity and extreme temperature vary greatly, and the methods and technologies used are also different. According to the mechanism of the formation and dissipation of the wet smoke plume, the common methods are summarized as follows: flue gas heating technology, flue gas condensation technology, flue gas condensation first and then heating technology and the combination of various methods.