Performance characteristics of a 200-kW organic Rankine cycle system in a steel processing plant

Taehong Sung, Eunkoo Yun, Hyun Dong Kim, Sang Youl Yoon, Bum Seog Choi, Kuisoon Kim, Jangmok Kim, Yang Beom Jung and Kyung Chun Kim

Applied Energy, 2016, vol. 183, issue C, 623-635

Abstract: The main objective of this research is to design and build a 200-kW ORC system with reduced size that could be installed in a steel processing plant where space is limited. The real-time operating characteristics of the ORC system are demonstrated with actual flue gases. First, an ORC system with R245fa refrigerant was developed for a heat source temperature of 140°C. The evaporation and condensation pressures were 2,090kPa and 220kPa, respectively. The net power output was 235.7kW with a thermal efficiency of 12.9%. Using an electric heat source, the design point performance of the system is experimentally demonstrated and shows a net power output of 177.4kW with thermal efficiency of 9.6%. The turbine isentropic efficiency and generator efficiency were 68.1% and 98.5% at a rotational speed of 14,000rpm. Next, the ORC system was implemented by designing a dedicated heat transfer loop for a steel processing plant using data measured from a chimney. The experimental net power output is 105.8kW with a thermal efficiency of 8.6% when the plant is operated at the highest work load. The fluctuation of the flue gas temperature is successfully suppressed with a thermal storage tank installed in the heat transfer loop. A partial-load analysis was conducted and showed that the system has the highest performance with more than 165kW of net power output. Economic analysis of such system showed that the right sized ORC system with always working parent plant had good economics with a payback period of 9years.

Keywords: Large-scale organic Rankine cycle; Steel processing plant; Field test; Flue gases (search for similar items in EconPapers)
Date: 2016
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Citations: View citations in EconPapers (13)

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DOI: 10.1016/j.apenergy.2016.09.018

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