Air Cooled Condenser
Air cooled condensers are a direct cooling system where the use of water to cool down the temperature is replaced by the use of air. ACCs are widely used in industries like energy industries, petrochemical industry, chemical industry, engineering industry and metallurgy, plastic and rubber industry, paper industry, manufacturing industry like food-processing, and sugar refineries. The cool and surrounded airflow outside of the finned tubes removes the heat and defines the principle on which an ACC functions. In thermal power plants, the steam coming from the turbine exhausts flows into the Air Cooled Condensers in which the temperature reduction (condensation) occurs. Then the condensed material goes back to the boiler acting in a closed loop. The steam coming from the turbine system is at low pressure, the ACC works at a pressure that is closer to vacuum, and the gases that can not be condensed are removed continuously by an air evacuation system. The thermal power plants that use ACCs can be easily built in any region where water may not be available easily or the use is restricted due to government policies since these do not require a large quantity of water for cooling. An air cooled condenser is constructed of sections that are arranged parallel to each other in rows. Each part has several fin tubes present in bundles. Using an axial flow the cooling air is forced across the area where heat is exchanged in the fin tubes. The general set-up for installation of an ACC includes: • A structure that supports the whole ACC. • The steam ducts from the steam turbine terminal interface. • Fans, motors, heat exchangers, finned tubes, gearboxes, and auxiliaries such as the drain and condensate pumps. • Duct drain tanks and condensate tanks. • The air evacuation systems. • Piping systems and instrumentations related to the ACC.
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