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The Structural Optimization for Spray Humidification System of Direct Air-cooling Unit

Author: ZhangQing
Tutor: ZhouLanXin
School: North China Electric Power University
Course: Thermal Power Engineering
Keywords: spray humidifier numerical simulation two-phase flow transfer of mass and thermal direct Air-cooling unit
CLC: TM621
Type: Master's thesis
Year: 2011
Downloads: 47
Quote: 0
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Abstract


The facts that direct air-cooling unit cannot manfa output under high temperature summer season is a common problem for similar power plant. The operation of the system shows that the spray humidifier device reduces the back pressure better in the direct air-cooling unit, and we take much study in the spray humidifier device, but the spray humidifier system structure impact on spray effect has not carried out with numerical simulation. The paper use the theory of the two-phase flow and the transfer of mass and thermal theory to make three dimensional numerical simulation on spray humidifier system added in the direct air-cooling unit. Then we can draw the true picture of distribution of air temperature in the direct air-cooling unit, which can provide us the academic for optimize design of adding spray humidifier system in the direct air-cooling unit.Through studying the theory of two-phase flow and transfer of mass and thermal, the paper establishing a practical significance spray humidification of 3D mathematical model, including gas flows, two-phase flow and nuzzle spray models. The gas flow use k ?εtwo sides model, two-phase flow use disperse model, nuzzle spray use pressure-swirl-atomizer model.Established physics and mesh model of direct air-cooling unit, And applied computational fluid dynamics software FLUENT to simulate the air filed in the direct air-cooling unit added spray humidifier system. The effects of nozzle of the layouts, nozzle aperture, spray pressure and spray direction on the condenser pressure are analyzed, and constantied optimization nozzle layout, tried to find good layout mode and nozzle parameters for spray humidifier effect.

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CLC: > Industrial Technology > Electrotechnical > Power generation, power plants > Power plant > Thermal power plants, thermal power stations
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