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Technical and economic evaluation of seawater freezing desalination using liquefied natural gas

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  • Ong, Chong Wei
  • Chen, Cheng-Liang

Abstract

This article aims to evaluate technical and economic feasibility of the direct contact type seawater freezing desalination (SFD) process proposed by Xie et al. (2018), where the cold energy is provided by regasification of liquefied natural gas (LNG). In the SFD process, the immiscible refrigerant that contains cold energy from LNG regasification is injected into a seawater tank to generate freshwater ice. The freshwater ice is separated and melted to obtain freshwater. Process analysis, integration and optimization are carried out with the aid of detailed material and energy balance models. The influences of some important operating variables of the ice generator, including the inlet temperatures of both refrigerant and seawater, the seawater flow rate and the ratio of seawater that is crystalized into freshwater ice are emphasized in this study. As the main operating cost and income of SFD process are strongly affected by both electricity and water prices, the comparison and effect of these prices in different regions are discussed. Sample calculations with the basis of 1 kg LNG/s show that the optimized SFD process is able to produce 1.64 kg/s of freshwater using 7.83 kg/s seawater when consuming 1.66 kW of electric power.

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  • Ong, Chong Wei & Chen, Cheng-Liang, 2019. "Technical and economic evaluation of seawater freezing desalination using liquefied natural gas," Energy, Elsevier, vol. 181(C), pages 429-439.
    • Handle: RePEc:eee:energy:v:181:y:2019:i:c:p:429-439
    DOI: 10.1016/j.energy.2019.05.193
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    References listed on IDEAS

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    5. Mehrpooya, Mehdi & Moftakhari Sharifzadeh, Mohammad Mehdi & Rosen, Marc A., 2015. "Optimum design and exergy analysis of a novel cryogenic air separation process with LNG (liquefied natural gas) cold energy utilization," Energy, Elsevier, vol. 90(P2), pages 2047-2069.
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    Cited by:

    1. Lawal, Dahiru U. & Qasem, Naef A.A., 2020. "Humidification-dehumidification desalination systems driven by thermal-based renewable and low-grade energy sources: A critical review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 125(C).
    2. Ong, Chong Wei & Chen, Cheng-Liang, 2021. "Intensification, optimization and economic evaluations of the CO2-capturing oxy-combustion CO2 power system integrated with the utilization of liquefied natural gas cold energy," Energy, Elsevier, vol. 234(C).
    3. Kiwan, Suhil & Alali, Abdullah & Al-Safadi, Mohammad, 2023. "A novel water freezing desalination plant integrated into a combined gas power cycle plant," Energy, Elsevier, vol. 263(PD).

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