Power Plant Output Augmentation by Evaporative Cooling Based on HRSG Blowdown Water Recycling in KSA: a Novel Approach

[+] Author and Article Information
Jose Eugenio Torres Carmona

Pöyry Switzerland Ltd

1Corresponding author.

ASME doi:10.1115/1.4036685 History: Received November 19, 2016; Revised April 27, 2017


The present study analysed the potential re-utilization and integration of the Heat Recovery Steam Generator (HRSG) blow-down into the evaporative cooling system. The Ras Al Khair Power and Desalination plant owned and operated by the Saline Water Conversion Corporation, located in the Eastern Province of the Kingdom of Saudi Arabia, was used as case study. The results indicates that during the summer season recycling the HRSG water blowdown into the gas turbine evaporative cooling systems would result on the internal water consumption for the gas turbine evaporative coolers decreasing by 545 ton/day , or 23.79%, compared with the original plant design which does not contemplate blowdown re-use. At the same time, by means of using the saved blowdown water on the evaporative cooling system of the plant, there is an overall gain of 186 MW, or 10.27 %, on gross power output, compared with the case on which the evaporative cooling system is not in operation. At the same time, and because of the reduction in fuel consumption resulting from the use of evaporative cooling, the CO2 emissions decrease by 46.8 t CO2/h which represents an 13.8 % reduction, if compared with the additional extra fuel needed to generate the equivalent power produced without evaporative cooling. Cost analysis demonstrated that implementation of the changes results in a negligible increase of the operational expenses (OPEX) of the plant, i.e. implementation of the suggested modification has no impact on the Cost of Electricity (CoE).

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