Hybridization of single flash geothermal power plant with biomass driven SCO2 topping cycle

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2020-9

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Mutlu, Balkan

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This study investigates the hybridization scenario of Kızıldere-1 single flash geothermal power plant with a biomass driven recompression sCO2 topping cycle where a solid local biomass source, olive residue, is used as a fuel. The combustion characteristics, kinetic parameters and slagging-fouling potential of the fuel are determined using TGA, Coats-Redfern Method and XRF analysis, respectively. The apparent activation energies for two observed major stages of combustion under the heating rate of 20 °C/min are calculated as 32.6 and 17 kJ/mol, respectively. The hybrid power plant is modeled using the simulation software EBSILON Professional. Supercritical CO2 (sCO2) cycle is specifically chosen due to having more compact footprint compared to steam cycles and the potential to be ramped up and down more rapidly, thus enabling flexible operation. A synergy between the topping and bottoming cycle is achieved by a good temperature match between the coupling heat exchanger where the waste heat from the topping cycle is utilized in the bottoming cycle. The high temperature heat addition problem to the sCO2 cycle is also eliminated utilizing the whole heat in the flue gas in the bottoming cycle. Hybrid cycle thermal efficiency and biomass-to-electricity conversion of 24.5% and 22% are achieved, respectively. The net power output of the hybrid power plant is increased to 17.8 MWe while the net production of the topping cycle is kept at 3.2 MWe. Corresponding fuel consumption for the hybrid plant is found as 2.2 kg/s.

Subject Keywords

sCO2 cycle, Biomass, Geothermal, Hybridization, sCO2 çevrimi, Biyokütle, Jeotermal, Hibridizasyon

URI

https://hdl.handle.net/11511/69202

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Graduate School of Natural and Applied Sciences, Thesis

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Citation Formats

B. Mutlu, “Hybridization of single flash geothermal power plant with biomass driven SCO2 topping cycle,” M.S. - Master of Science, Middle East Technical University, 2020.