Dry And Wet Combined Cooling Tower Design Andcalculation Of The Amount Of Water

The cold-end system is an important auxiliary system for a thermal power plant,its working conditions directly affect the economic operation of power plant. Thispaper firstly introduces the definition of power plant cooling system and the types andthe operation characteristics. And then analyse is inlfuencing factors of the cold-endsystem in detail, And in the light of the cold end system of the ifrst three parts (steamturbine last stage, condenser, circulating pump) abstract out one of the most sensitiveand easy to control the quantity circulation water, The mathematic calculation modelof the condenser pressure is established, the main factors which have influence on thecondenser pressure are analyzed. And then the cooling tower type, structure,operation mode are analyzed in detail.To guarantee operation process of thecirculating water flow rate for the optimum circulating water flow rate on the basis ofthe cooling tower to structure design, through the comparison of the present coolingtower type and its the application results in power plant, this paper focuses on the dryand wet combined cooling tower type, gives its definition, working principle andstructure diagram. According to the feature that the air cooling unit can’t take full loadin the summer，combined with the local weather conditions, the dry cleaning and wetpart of the heat dissipating capacity the reasonable distribution calculation, It mainlyincludes wet joint system initial temperature difference ITD value optimization andcooling tower size calculation and optimization. In order to find out the change ruleof the best circulation water, which has combined dry and wet cooling tower factors.In the dry and wet combined cooling tower in the process of optimization calculationthe least years stand all cost method. The paper has analyzed the600MW unit. In theprovision years of economic length service, we have done some conversion for theannual operation cost and investment cost to the cooling system., which get in aspecified external environment temperature corresponding optimal ITD value； The paper finally, the dry and wet cooling tower after combined with water-saving effectto carry on the detailed calculation, Thus calculated by the dry and wet cooling towerafter the combination, power plant water saving effect and the sole use of coldcompared to53%, saving water. This has fully demonstrated the dry and wetcombined cooling tower to power plant with the economic effect and environmentaleffect.