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Design and thermodynamic analysis of a novel structure utilizing coke oven gas for LNG and power cogeneration

Mohammad Shamsi, Saeed Rooeentan, Behtash Karami, Kamal Elyasi Gomari, Masoud Naseri and Mohammad Bonyadi

Energy, 2023, vol. 277, issue C

Abstract: Coke oven gas is a by-product of the process of producing coke from coal and contains valuable compounds such as hydrogen and methane. In this study, an improved process was proposed for co-generation of power and LNG from COG with low CO2 emissions and high energy and exergy efficiency. This proposed process includes: LNG Recovery Unit, Organic Rankin Cycle, and the power plant. The results of simulation showed that the exergy and energy efficiencies for this proposed process are 77.9% and 70.29%, respectively, which are considerably higher than other studies. It is found that the total exergy destruction of the proposed process is 4272.95 kW, and the power plant with 3118.1 kW exergy destruction has the largest share in total exergy destruction. Additionally, outcomes showed that ORC recovered 1205 kW of waste heat from compressor exhaust gases and produced 167.4 kW of power. Environmental analysis shows indirect carbon emissions for the proposed process is zero. The CO2 emissions for the total energy and electric power generation were 0.0034 kgCO2/MJ and 406 gCO2/kWhel, respectively which are lower than coal or natural gas power plants.

Keywords: Coke oven gas; Energy; Exergy; Co-generation; LNG; CO2 emissions; Power (search for similar items in EconPapers)
Date: 2023
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Citations: View citations in EconPapers (2)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:277:y:2023:i:c:s0360544223010502

DOI: 10.1016/j.energy.2023.127656

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