The Numerical Study On The Optimization Layout Of Air-cooled Condenser Under Windy Conditions

Power is the foundation of modern industry,which also restricts the economic development of a country.China is a thermal power dominant countries,cooling tower is the indispensable part of the power plant.In order to save costs,many coal power stations be built in the place where rich coal but shortage of water,such as North China northwest of China and northeast of China.However,air-cooled condenser compared with the conventional wet cooling tower which needs large amounts of water saving more than 90%water.Therefore many coal-fired power plants shortage of water give preference to air-cooled condenser.But the windy influence of air-cooled condenser which even endangers the safe operation of the unit can not be ignored.V-type air-cooled condenser layout which not only increased outlet speed but decreased inlet speed has been put forward in this paper,This paper uses the fluent simulation and analysis a 2*300 mw air-cooled condenser power plant modeling with gambit.Differences of the performance between A-type air-cooled condenser layout and V-type air-cooled condenser layout under the influence of the different wind speed was comparative studied.The results showed that:(1)without wind,the mass air flow of A-type air-cooled condenser layout is 4%larger than V-type air-cooled condenser layout in the same fan Settings,which means V-type air-cooled condenser layout will consume more than 11%energy to achieve the same mass air flow of A-type air-cooled condenser layout.(2)The mass air flow of A-type air-cooled condenser layout and V-type air-cooled condenser layout decrease with the increase of the wind velocity,but the total mass air flow of V-type air-cooled condenser layout is always greater than A-type air-cooled condenser layout.But the air distribution uniformity of A-type air-cooled condenser layout is better than that of V-type air-cooled condenser layout(3)The heat exchange efficiency of A-type air-cooled condenser layout and V-type air-cooled condenser layout both decrease with the increase of the wind velocity.But the heat exchange efficiency of V-type air-cooled condenser layout is obviously higher than that of A-type air-cooled condenser layout in the wind velocity of 3 m/s,6 m/s and 9 m/s.When the wind velocity over 15 m/s the heat exchange efficiency of A-type air-cooled condenser layout is nears to V-type air-cooled condenser layout or even slightly larger than V-type air-cooled condenser layout.(4)With the wind velocity increasing,the hot air recirculation rate of A-type air-cooled condenser layout and V-type air-cooled condenser layout both first increase and then decrease.The hot air recirculation rate of V-type air-cooled condenser layout is less than that of A-type when wind speed less than 15 m/s;After the wind speed greater than 15 m/s,the hot air recirculation rate of V-type air-cooled condenser layout is greater than that of A-type gradually.(5)Back pressure change rule is the same as the heat exchange efficiency.(6)The performance of V-type air-cooled condenser layout is better than A-type when wind speed less than 15 m/s.(maybe different according to the power plant building differences or arrangement).But V-type air-cooled condenser layout consumes more energy which will increase the cost the plant.This conclusion can provide reference for design.