A power plant in India will use a high-rate clarification and thickening process to treat cooling tower makeup water.
Siemens Industry Inc.'s Water Technologies Business Unit in Hoffman Estates,
Ill., will provide cooling tower makeup water treatment equipment to a power
plant in India. The order for Torrent Power Ltd.’s 382.5 MW gas-based combined-cycle
power plant in India's Surat, Gujarat district, includes two Contrafast concentric
systems. The systems will treat water from the Tapi River and produce up to 4
million gal/day of cooling tower makeup water. The system, slated for a
September 2012 commissioning, is part of a capacity expansion at the power
Power plants need a consistent, reliable source of water for cooling tower
makeup In many cases, cooling tower makeup water must be treated for suspended
solids reduction or hardness reduction. With properly treated water, the
potential for scaling in the cooling tower is reduced, which then reduces
cooling-circuit cleaning requirements, extends the life of the cooling
equipment, and reduces the cooling tower blowdown flow to the environment.
The Siemens Contrafast concentric system is a high-rate clarification and
thickening process that consists of a solids contact reaction chamber,
clarifier with tube settler and gravity thickener in a single tank. The entire
process is contained in a single, unitized steel basin to simplify installation.
According to Siemens, Torrent Power, headquartered in Ahmedabad, Gujarat
district, chose the Contrafast system mainly because of its integral solids
thickener and minimal footprint. The design allows up to an 80 percent smaller footprint
compared to some other conventional clarification systems, and the process
enhances suspended solids’ removal, lime softening and heavy metals removal.