The Underground Power Station Dehumidifier Effect And Design Method

The construction of hydropower plant has been developed rapidly during the lastdecade, due to the government encouragement of exploiting hydroelectric resource.Under the consideration of topography conditions and other limits, undergroundpower-house turns to be the first choice for the existing large hydropower stations, aswell as many under-construction or proposed hydro-electric projects. Generally, thelocation of power station is deeply beneath the surface, with no direct sunlight and thesurface of enclosures retains wet all the year round. Thus, the culating air relativehumidity is quite high. Moreover, the values of relative humidity in turbine layer andvolute layer even exceed90%, which contribute to the frequency of dew formation. Thewet ambient will not only affects the service life of electrical equipment, but also poseshealth risks.In this paper, we offer a probing theoretical study about the wet condition of theunderground power plant, and then a field test as well as detailed numerical simulationof heat and humid environment in summer of Huizhou is conducted. Furthermore, ananalysis for the operation problem existed in dehumidifier is given. The author attainsthe "effective dehumidification radius" and the range of effective dehumidification bycontrasting heat and humid environment of plant A and B in Huizhou pumped storagepower (the installed capacity and cavern structure of plant A and B are exactly the same,except that plant B installed thirteen dehumidifiers, while plant A installed none).Finally, a rational design methodology and arrangement guideline for dehumidifier inunderground power-house is recommended.