Explain the construction and working of induced draft cooling tower with neat sketch.

Explain the construction and working of induced draft cooling tower with neat sketch.
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1 Answer

Answer :

Induced draft cooling tower : 

Diagram:

image

Construction and working: Cooling towers are employed to cool utility cooling water by direct contact with air. The parts of a cooling tower are Water spray nozzle: water is sprayed in the cooling tower at the top with the help of nozzles. The spray helps to atomize the water in small droplets which results in increase in surface area of water and hence faster cooling. Mist eliminator: They are placed just above the spray nozzle to reduce the loss of water and thus protect the fan blades from corrosion in the case of induced draft tower. Cold water basin: It is the basin below the cooling tower where the cooled water accumulates and from where it is send to various heat exchange units. 

Fill or packing: They are provided in the cooling tower to increase the surface area for heat transfer and evaporation. They create obstacles in the path of water and air flow due to which thorough mixing of air and water takes place which results in attaining adiabatic equilibrium. Fan: Fan is mounted at the top portion of the cooling tower. Hot water is sprayed into the cooling tower through the spray nozzle. As it passes through the fills through mixing of water and air takes place and heat is removed from the water. The fan mounted at the top pulls the hot air through the fills and cooled water gets collected in the cold water basin.

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