Optimal design and integration of a cryogenic Air Separation Unit (ASU) with Liquefied Natural Gas (LNG) as heat sink, thermodynamic and economic analyses

Ebrahimi, Armin; Ziabasharhagh, Masoud

doi:10.1016/j.energy.2017.02.145

Cited by 102 publications

(32 citation statements)

References 19 publications

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“…Properly designed LNG vaporization can improve the efficiency of an overall cycle by using the cold exergy of LNG [10][11][12][13]. This can be a source of cooling power [14][15][16], used in the air separation process [17,18], in the freeze desalination process [19][20][21][22][23], or to improve the capacity of Adsorbed Natural Gas (ANG) tanks [2].…”

Section: Introductionmentioning

confidence: 99%

Theoretical and Numerical Analysis of Freezing Risk During LNG Evaporation Process

2019

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The liquid natural gas (LNG) boiling process concerns most LNG applications due to a need for regasification. Depending on the pressure, the equilibrium temperature of LNG is 112–160 K. The low boiling temperature of LNG makes the vaporization process challenging because of a large temperature difference between the heating medium and LNG. A significant risk included in the regasification process is related to the possibility of solid phase formation (freezing of the heating fluid). A solid phase formation can lead to an increase in pressure loss, deterioration in heat transfer, or even to the destruction of the heat exchanger. This prompts the need for a better understanding of the heat transfer during the regasification process to help avoid a solid phase formation. The present research is focused on the investigation of the mutual interactions between several parameters, which play a significant role in the regasification process. The research is based on a zero-dimensional (0D) model, which was validated through the comparison with a state-of-the-art Computational Fluid Dynamics (CFD) model. This made fast calculations and the study of the risk of freezing for a wide range of parameter space possible, including the LNG boiling regime. The boiling regime of LNG was shown to be a key factor in determining the risk of freezing.

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Section: Introductionmentioning

confidence: 99%

Theoretical and Numerical Analysis of Freezing Risk During LNG Evaporation Process

2019

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“…The following equations are utilized for updating the investment cost of the process equipment computed based on the given relations in the literature (Table 9). 34,43

{Cost}_{reference year} = {Cost}_{original year} \frac{Cost {index}_{reference cost year}}{Cost {index}_{original cost year}},

\begin{matrix} lefttrue \\ ACS = C_{acap} (components) + C_{arep} (components) + C_{amain} (components) + C_{aope} (labor cost + fuel cost + insurance cost) . \end{matrix}

…”

Section: Economic Analysismentioning

confidence: 99%

Novel integrated helium extraction and natural gas liquefaction process configurations using absorption refrigeration and waste heat

et al. 2020

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Summary Conceptual design and modeling of novel‐integrated process configurations for helium extraction and natural gas liquefaction is investigated. Mixed fluid cascade (MFC) refrigeration system is considered for providing the needed refrigeration in the natural liquefaction section. Using an absorption refrigeration system as the precooling cycle is investigated in one of the introduced processes. Integrated flash and distillation method is used for helium extraction. Purity of the extracted crude helium is 50% (mole). Process streams operational condition and specifications of the devices are presented and explained. Composite curves of the heat exchangers demonstrate that thermal design has been done properly. Ratio of the power consumption to the produced liquefied natural gas (LNG) of the MFC process is 0.265 kWh per kg LNG and applying absorption refrigeration system instead of the pre‐cooling cycle decreases it to 0.1849 kWh per kg LNG. For the modified process with absorption refrigeration system helium extraction rate and power consumption ratio are 0.951 and 132.9 (kWh/[kgmole Helium]) respectively. Exergy method is applied on the under consideration processes. The results show that the compressors have the highest rate of exergy destruction among the other process equipment. An extensive economic analysis is done on the proposed processes. The results show that prime cost of the product (US$/kg LNG) for MFC and modified MFC processes are 0.1939 and 0.2069, respectively. Finally, a sensitivity analysis is done based on the economic factors such as electrical energy price and prime cost of the product.

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“…Using fossil fuels as the main energy source has led to environmental pollution and serious energy crises on a global scale. Natural gas, coal, and gasoline have more combustion and generate more pollution [1]. Different types of offshore platforms are constructed to transport natural gas and crude oil to the surface.…”

Section: Introductionmentioning

confidence: 99%

Technical and Economical Investigation of Renewable Energy Sources for Supplying Offshore Oil production Facilities at The Gulf of Suez Area

El-Nemr

Farrag²,

Dawood

2021

Journal of Engineering Research

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The Gulf of Suez is highly susceptible to economic and energy security due to the heavy need for imported fossil fuels. The energy produced from fossil fuels causes serious environmental pollution. So, it is important to find other clean sources of energy for stabilizing the released amount of carbon dioxide. Gulf of Suez has the potential to develop clean Solar Photovoltaic (PV) and wind systems to improve economic and environmental performance. This paper proposes a combination of floating solar panels (FSP) and offshore wind turbines to solve the main critical issues, such as the land area required for a large number of cells and the space required for wind turbines. In addition to their good economical and environmental benefits. A simplified model is provided to investigate the replacement of traditional generating units (Diesel and Gas operated) supplying offshore oil production field facilities at the Gulf of Suez area with a mix of renewable resources. The load flow analysis is carried out for the model and the cost is calculated and compared for four schemas, the traditional generating, Wind-Gas, PV-Gas, and PV-Wind-Gas hybrid system. From the techno-economic analysis and comparing environmental benefits, floating solar systems and offshore wind turbines can provide a good solution to the existing problems of energy needs with environmental impacts considered.

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Optimal design and integration of a cryogenic Air Separation Unit (ASU) with Liquefied Natural Gas (LNG) as heat sink, thermodynamic and economic analyses

Cited by 102 publications

References 19 publications

Theoretical and Numerical Analysis of Freezing Risk During LNG Evaporation Process

Theoretical and Numerical Analysis of Freezing Risk During LNG Evaporation Process

Novel integrated helium extraction and natural gas liquefaction process configurations using absorption refrigeration and waste heat

Technical and Economical Investigation of Renewable Energy Sources for Supplying Offshore Oil production Facilities at The Gulf of Suez Area

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