Thermo-Economic Analysis on Integrated CO 2, Organic Rankine Cycles, and NaClO Plant Using Liquefied Natural Gas

Tri Tjahjono, Mehdi Ali Ehyaei, Abolfazl Ahmadi, Siamak Hoseinzadeh and Saim Memon
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Tri Tjahjono: Department of Mechanical Engineering, Universitas Muhammadiyah Surakarta, Surakarta 57102, Indonesia
Mehdi Ali Ehyaei: Department of Mechanical Engineering, Pardis Branch, Islamic Azad University, Pardis New City 1468995513, Iran
Abolfazl Ahmadi: Department of Energy Systems Engineering, School of Advanced Technologies, Iran University of Science and Technology, Tehran 1311416846, Iran
Siamak Hoseinzadeh: Department of Planning, Design, and Technology of Architecture, Sapienza University of Rome, Piazzale Aldo Moro 5, 00185 Roma, Italy
Saim Memon: Solar Thermal Vacuum Engineering Research Group, London Centre for Energy Engineering, School of Engineering, London South Bank University, London SE1 0AA, UK

Energies, 2021, vol. 14, issue 10, 1-24

Abstract: The thermal energy conversion of natural gas (NG) using appropriate configuration cycles represents one of the best nonrenewable energy resources because of its high heating value and low environmental effects. The natural gas can be converted to liquefied natural gas (LNG), via the liquefaction process, which is used as a heat source and sink in various multigeneration cycles. In this paper, a new configuration cycle is proposed using LNG as a heat source and heat sink. This new proposed cycle includes the CO 2 cycle, the organic Rankine cycle (ORC), a heater, a cooler, an NaClO plant, and reverse osmosis. This cycle generates electrical power, heating and cooling energy, potable water (PW), hydrogen, and salt all at the same time. For this purpose, one computer program is provided in an engineering equation solver for energy, exergy, and thermo-economic analyses. The results for each subsystem are validated by previous researches in this field. This system produces 10.53 GWh electrical energy, 276.4 GWh cooling energy, 1783 GWh heating energy, 17,280 m 3 potable water, 739.56 tons of hydrogen, and 383.78 tons of salt in a year. The proposed system energy efficiency is 54.3%, while the exergy efficiency is equal to 13.1%. The economic evaluation showed that the payback period, the simple payback period, the net present value, and internal rate of return are equal to 7.9 years, 6.9 years, 908.9 million USD, and 0.138, respectively.

Keywords: energy; exergy; thermo-economic; CO 2 cycle; organic Rankine cycle; reverse osmosis (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (4)

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