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Direct air cooling system is the use of mechanical ventilation to make steam turbine exhaust steam do the condensation in the finned tube air condenser directly, mainly composed of large pipe diameter of exhaust duct, air condenser, axial flow cooling fan and condensation pump etc.

Direct air will complete heat exchange with steam, which the process flow would be turbine exhaust steam through a large exhaust pipe into the outdoor air condenser, axial flow cooling fan would make air flow across the outer surface of the cooler into water, then  back to the boiler.

Direct air cooling system does not require intermediate medium such as the cooling water etc., and it has so many advantages like fewer equipment, simple system, less occupation area, flexible system regulation etc.

The indirect air cooling system with surface condenser is composed of surface condenser, air cooling radiator, circulating water pump, nitrogen charging protection system, circulating water supply water system, radiator cleaning system and air cooling tower.

Indirect air cooling system of the technological process is: steam exhausted would be by circulating water into the water side of surface condenser through turbine exhaust steam of the heat steam condenser side, the circulating water after heating would be conveyed into the cooling tower by circulating water pump and complete heat transfer surface by cooling radiator and air, and then circulating water after cooling air would be returned to condenser to cool steam turbine exhausted, which mentioned constitutes the sealing circulation.

Main advantages: low operation cost, high reliability; Low noise, lower ground pollution.

Indirect air cooling system would be less sensitive or changes caused influence to the environmental meteorological conditions comparing with direct air cooling system, because the indirect air-cooled system generally adopts the natural ventilated cooling tower, and the meteorological factors such as the wind direction of environment along with wind speed would be also significant to the cooling tower and less than direct air cooling system apparently without thermal wind back flow.

Mechanical draft air cooling tower could be arranged streets by ventilation unit. Mechanical draft tower adopts by fan forced ventilation method, so it does not require the high and huge fan bell required by natural ventilation cooling tower, its size is greatly reduced, and the cost would be greatly reduced.The fan can be adjusted by the air volume so that the cooling tower would be working stably without influence by the climate, which would make more efficient comparing with the natural ventilation tower.

The system could be used in extreme cold weather conditions by the anti-freeze design and also applied in extreme hot environment.