Energy Conserving in Power Plant: A Case Study of Practical Demand Cutting in Power Station Service System

Abstract

This paper proposes an energy conserving practice in gas turbine and combined cycle power plant (GTCC) during the plant operating in reserve shutdown mode. By using demand cutting in plant station services system, which was a case study of one unit combined cycle system of the twos in Wang-Noi power plant block-4, EGAT-Thailand. The results from the field data illustrated that, among available technical possibilities during the plant operating in reserve shutdown mode, demand cutting in circulating and cooling water pump system (CWP), by redirecting and replacing the large, conventional circulating water circuit, with the new one of fractional flow capacity and the driven motor, was the promised and effective approach. The best practice on energy conserving of the CWP system during the post commissioning period, was recorded as much as 50% in averaged of demand reduction when compared to the base case of the pre-commissioning period. It finally turned out to be approximately 556 MWh of the expected energy conserving per year.