ABOUT NATURAL DRAFT COOLING TOWERS:
Natural draft cooling towers use very large concrete chimneys to introduce air through the media. Due to the large size of these towers, they are generally used for water flow rates above 45,000 m3/hr. These types of towers are used only by utility power stations.Utilizes buoyancy via a tall chimney. Warm, moist air naturally rises due to the density differential compared to the dry, cooler outside air. Warm moist air is less dense than drier air at the same pressure. This moist air buoyancy produces an upwards current of air through the tower.
ADVANTAGES:
The natural draft cooling tower is the right choice for large power plants.
It offers the following advantages :
-power saving (no power consumption to induce air flow- no fan)
-environmentally friendly
-no mechanical noise (no fan)
-safety of operation
-no recirculation as the plume is rejected at high level
-limited plot area
-limited maintenance
-high longevity (generally more than plant life expectancy)
-Payback period between 8 and 16 years depending on several factors
Natural draft cooling towers with water collecting devices:
Tipo Heat Exchangers offers both basin or water collecting devices. This last solution, developed by Tipo Heat Exchangers, is recommended for large cooling towers.
It offers the following advantages :
– less pressure drop in the air inlet
-reduction of pumping power
-decrease of acoustic pressure in air inlet.