Classification and advantages and disadvantages of power station air cooling systemThere are three main types of power plant air cooling systems, namely direct air cooling system, indirect air cooling system with surface condenser (Harmon system), and indirect air cooling system with jet (hybrid) condenser (Heller system). The advantage of a direct air cooling system is that it has a low one-time investment and is easy to achieve uniform and stable distribution of cooling air at all atmospheric temperatures; The disadvantage is that the fan consumes electricity, and the cooling air directly exchanges heat with the exhaust gas of the turbine. The advantage of the Harmon system is that it does not consume electricity, and the cooling air does not directly exchange heat with the steam turbine tubes. The amount of cooling water can be adjusted according to the season; The disadvantage is that steel finned tube bundles and surface condensers are used, and most of the equipment is made of steel, resulting in high one-time investment. The advantage of the Heller system is that it has lower investment and saves the floor area of the main factory building; The disadvantage is that the system is complex, and the cooling water comes into direct contact with the exhaust gas of the steam turbine.