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Energies 2016, 9(6), 399; doi:10.3390/en9060399

Performance Comparison on Repowering of a Steam Power Plant with Gas Turbines and Solid Oxide Fuel Cells

Department of Mechanical Engineering, Thermal Energy Section, Technical University of Denmark, Nils Koppels Allé, Copenhagen 2800, Denmark
Academic Editor: Jinliang Yuan
Received: 22 March 2016 / Revised: 3 May 2016 / Accepted: 11 May 2016 / Published: 26 May 2016
(This article belongs to the Special Issue Solid Oxide Fuel Cells)
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Abstract

Repowering is a process for transforming an old power plant for greater capacity and/or higher efficiency. As a consequence, the repowered plant is characterized by higher power output and less specific CO2 emissions. Usually, repowering is performed by adding one or more gas turbines into an existing steam cycle which was built decades ago. Thus, traditional repowering results in combined cycles (CC). High temperature fuel cells (such as solid oxide fuel cell (SOFC)) could also be used as a topping cycle, achieving even higher global plant efficiency and even lower specific CO2 emissions. Decreasing the operating temperature in a SOFC allows the use of less complex materials and construction methods, consequently reducing plant and the electricity costs. A lower working temperature makes it also suitable for topping an existing steam cycle, instead of gas turbines. This is also the target of this study, repowering of an existing power plant with SOFC as well as gas turbines. Different repowering strategies are studied here, repowering with one gas turbine with and without supplementary firing, repowering with two gas turbines with and without supplementary firing and finally repowering using SOFC. Plant performances and CO2 emissions are compared for the suggested repowered plants. View Full-Text
Keywords: solid oxide fuel cell (SOFC); repowering; hybrid cycles; combined cycles (CC); CO2 emission solid oxide fuel cell (SOFC); repowering; hybrid cycles; combined cycles (CC); CO2 emission
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Rokni, M. Performance Comparison on Repowering of a Steam Power Plant with Gas Turbines and Solid Oxide Fuel Cells. Energies 2016, 9, 399.

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