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Energies 2017, 10(3), 275; doi:10.3390/en10030275

Thermodynamic Performance Analysis of a Biogas-Fuelled Micro-Gas Turbine with a Bottoming Organic Rankine Cycle for Sewage Sludge and Food Waste Treatment Plants

School of Mechanical Engineering, Pusan National University, Busan 46241, Korea
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Academic Editor: Andrew J. Haslam
Received: 9 January 2017 / Revised: 17 February 2017 / Accepted: 21 February 2017 / Published: 26 February 2017
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Abstract

In the Republic of Korea, efficient biogas-fuelled power systems are needed to use the excess biogas that is currently burned due to a lack of suitable power technology. We examined the performance of a biogas-fuelled micro-gas turbine (MGT) system and a bottoming organic Rankine cycle (ORC). The MGT provides robust operation with low-grade biogas, and the exhaust can be used for heating the biodigester. Similarly, the bottoming ORC generates additional power output with the exhaust gas. We selected a 1000-kW MGT for four co-digestion plants with 28,000-m3 capacity. A 150-kW ORC system was selected for the MGT exhaust gas. We analysed the effects of the system size, methane concentration, and ORC operating conditions. Based on the system performance, we analysed the annual performance of the MGT with a combined heat and power (CHP) system, bottoming ORC, or both a bottoming ORC and CHP system. The annual net power outputs for each system were 7.4, 8.5, and 9.0 MWh per year, respectively. View Full-Text
Keywords: biogas; micro gas turbine; organic Rankine cycle; sewage sludge; food waste biogas; micro gas turbine; organic Rankine cycle; sewage sludge; food waste
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Kim, S.; Sung, T.; Kim, K.C. Thermodynamic Performance Analysis of a Biogas-Fuelled Micro-Gas Turbine with a Bottoming Organic Rankine Cycle for Sewage Sludge and Food Waste Treatment Plants. Energies 2017, 10, 275.

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