Solar feed water heating feasibility for a conventional steam power plant

Technical and economic feasibility of heating feed water through parabolic trough solar collectors has been discussed in this paper. This integration of solar energy with steam plants saves extraction steam, thus increasing turbine output. The study is based on a 210 MW Heavy fuel oil (HFO) fired power plant for Karachi weather conditions. Pressurized hot water storage system is used as heat storage medium. TRNSYS software is used to find out useful energy collected through parabolic trough collectors and heat storage in pressurized hot water storage system. Life cycle savings (LCS) using HFO prices of two different periods i.e. May, 2014 (higher HFO price) and Feb., 2016 (lower HFO price) are calculated and compared. Effect of change in HFO price on LCS is also presented. Integration of higher pressure FWH with solar energy is found more feasible in terms of LCS as compared to lower pressure FWH. Same methodology can be deployed on other plants around the globe to determine LCS and economic feasibility.

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