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http://dx.doi.org/10.5293/kfma.2017.20.1.041

Evaluation of Performance and Economics of Organic Rankine Cycle Integrated into Combined Cycle Cogeneration Plant  

Kim, In Seop (Graduate School, Inha University)
Kim, Chang Min (Graduate School, Inha University)
Kim, Tong Seop (Dept. of Mechanical Engineering, Inha University)
Lee, Jong Jun (R&D Institute, Korea District Heating Corporation)
Publication Information
The KSFM Journal of Fluid Machinery / v.20, no.1, 2017 , pp. 41-47 More about this Journal
Abstract
This study aimed to analyze organic Rankine cycle(ORC) which recovers discarded heat from a gas turbine based combined cycle cogeneration(CC-cogen) plant in terms of both performance and economics. The nominal electric power of the CC-cogen plant is around $120MW_e$, and heat for district heating is $153MW_{th}$. The major purpose of this study is to compare various options in selecting heat source of the ORC. Three heat sources were compared. Case 1 uses the exhaust gas from the HRSG, which is purely wasted to environment in normal plant operation without ORC. Case 2 also uses the exhaust gas from the HRSG. On the other hand, in this case, the DH economizer, which is located at the end of the HRSG, does not operate. Case 3 generates power using some of the district heating water which is supplied to consumers. The estimated ORC power generation ranges between 0.3 to 2.3% of the power generation capacity of the CC-cogen plant. Overall, Case 3 is evaluated to be better than other two options in terms of system design flexibility and power generation capacity.
Keywords
Cogeneration; Combined Cycle; Organic Rankine Cycle; Thermo-economic Analysis;
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