Large coal power plant water purification

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South Africa’s leading power provider, Eskom, is to use GE’s water and wastewater technology for the Kusile Power Plant, which, once fully operational, is expected to be one of the world’s largest coal-fired power plants. South Africa, at times known for often facing drought conditions, has limited freshwater supply, and GE’s technology will provide maximum water reuse for the plant.

Eskom’s coal-fired power plant is located in Nkangala district municipality within the Mpumalanga province. With water becoming an increasingly limited resource in South Africa, GE’s advanced water and wastewater equipment will filter approximately 250 million liters of water per day to be used in the power plant and will significantly reduce operating costs and increase efficiency.

Under the terms of the contract, valued at over USD40 million, GE will provide water treatment technology to engineering firm PD Naidoo and Associates (PDNA), the engineering, procurement and construction (EPC) contractor, including boiler feed water treatment for ultrapure water, six condensate polishing plants and wastewater treatment.

The boiler feed water treatment will consist of ultrafiltration, cation exchange, degasification to remove carbon dioxide; anion exchange followed by a mixed bed polishing system and then a degasifier to remove oxygen. This system will produce ultrapure water suitable to feed a super critical boiler. In addition, GE is supplying six condensate polishing plant units, which will polish 1,760 tons per hour of condensate water. Finally, to treat the brine generated by the flue gas process, a two train evaporator and a crystalliser will convert brine to a dry salt suitable for disposal.

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