Optimization and comparative analysis of LNG regasification processes

Fahmy, M.F.M.; Nabih, H. I.; El-Rasoul, T.A.

doi:10.1016/j.energy.2015.08.035

Cited by 29 publications

(11 citation statements)

References 29 publications

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“…According to [14,41,42], modelling of different regasification pressure of LNG vaporiser and NG trim heater should be analysed to observe LNG cold energy changes. The complete change in enthalpies in heat exchangers could be calculated as follows (Equation (1)):…”

Section: Thermodynamic Calculation Of Lng Regasification Systemmentioning

confidence: 99%

Improvement of Regasification Process Efficiency for Floating Storage Regasification Unit

Semaškaitė

Bogdevičius

Paulauskienė

et al. 2022

JMSE

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Natural gas plays a vital role in the economically and environmentally sustainable future of energy. Its reliable deliveries are required, especially nowadays, when the energy market is so volatile and unstable. The conversion of natural gas to its liquefied form (LNG) allows its transport in greater quantities. Affordability and reliability of clean energy is a key issue even for developed markets. Therefore, natural gas usage enables to implement green solutions into countries’ economies. However, the LNG-production process consumes a considerable amount of energy. This energy is stored in LNG as cold energy. After LNG unloading into storage tanks at receiving terminals, it is vaporised and compressed for transmission to a natural gas pipeline system. During the regasification process, the large part of the energy stored in LNG may be recovered and used for electricity generation, seawater desalination, cryogenic air separation, hydrogen liquefaction, material freezing, carbon dioxide capture, as well as for combined LNG cold energy utilization systems. Moreover, increased efficiency of LNG terminals may attract potential clients. In the presented paper, a mathematical model is performed to determine the influence of LNG composition and regasification process parameters on the quantity of released LNG cold energy in a large-scale floating storage and regasification units (FSRU)-type terminal “Independence” (Lithuania). Flow rate of LNG regasification, pressure, and boil-off gas recondensation have been considered. Possibilities to reduce the energy losses were investigated to find the ways to improve the regasification process efficiency for real FSRU. The results analysis revealed that potential of LNG cold energy at FSRU could vary from 20 to 25 MW. A utilisation of industrial and urban waste heat for the heat sink FSRU is recommended to increase the energy efficiency of the whole regasification process.

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Section: Thermodynamic Calculation Of Lng Regasification Systemmentioning

confidence: 99%

Improvement of Regasification Process Efficiency for Floating Storage Regasification Unit

Semaškaitė

Bogdevičius

Paulauskienė

et al. 2022

JMSE

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“…More recently, Fahmy et al [18] assessed the best regasification plant configuration, studying which provided the best production in terms of C 2 + concentration. An interesting work has been proposed by Li et al [19].…”

Section: Literature Reviewmentioning

confidence: 99%

Dynamic Modelling of LNG Powered Combined Energy Systems in Port Areas

et al. 2021

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Liquefied Natural Gas (LNG) is a crucial resource to reduce the environmental impact of fossil-fueled vehicles, especially with regards to maritime transport, where LNG is increasingly used for ship bunkering. The present paper gives insights on how the installation of LNG tanks inside harbors can be capitalized to increase the energy efficiency of port cities and reduce GHG emissions. To this purpose, a novel integrated energy system is introduced. The Boil Off Gas (BOG) from LNG tanks is exploited in a combined plant, where heat and power are produced by a regenerated gas turbine cycle; at the same time, cold exergy from LNG regasification contributes to an increase in the efficiency of a vapor compression refrigeration cycle. In the paper, the integrated energy system is simulated by means of dynamic modeling under daily variable working conditions. Results confirm that the model is stable and able to determine the time behavior of the integrated plant. Energy saving is evaluated, and daily trends of key thermophysical parameters are reported and discussed. The analysis of thermal recovering from the flue gases shows that it is possible to recover a large energy share from the turbine exhausts. Hence, the system can generate electricity for port cold ironing and, through a secondary brine loop, cold exergy for a refrigeration plant. Overall, the proposed solution allows primary energy savings up to 22% when compared with equivalent standard technologies with the same final user needs. The exploitation of an LNG regasification process through smart integration of energy systems and implementation of efficient energy grids can contribute to greener energy management in harbors.

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“…This not only will require N 2 but also will increase the percentage of inert in the send out NG. According to pipeline specifications, the percentage of inert in the send out gas should not exceed 3 mol %. , We have analyzed LNG from 15 exporting countries with heating values in the range of 39–42 MJ/Nm 3 . Figure represents the nitrogen content in the send out NG after the LNG feed is diluted with nitrogen to match its specified heating value.…”

Section: Introductionmentioning

confidence: 99%

“…The third strategy for reducing the heating value involves heavy hydrocarbons removal (HHR) from the LNG feed. − This strategy unlike N 2 dilution or blending with lean LNG does not depend on the availability of an external agent, i.e., N 2 or a lean LNG. Rather, this strategy can be applied to any LNG feed.…”

Section: Introductionmentioning

confidence: 99%

Heating Value Reduction of LNG (Liquefied Natural Gas) by Recovering Heavy Hydrocarbons: Technoeconomic Analyses Using Simulation-Based Optimization

Dutta

Karimi

Farooq

2018

Ind. Eng. Chem. Res.

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LNG is expected to play a major role in global natural gas trade. Implementing a heating value adjustment unit within regasification terminal allows importing of LNG from diverse sources around the world, thus increasing the energy security of the importing country. In this study, we focus on heavy hydrocarbons removal (HHR) as a strategy to reduce heating value of LNG to meet desired specifications. We have developed a superstructure for the HHR process, which is optimized using a particle swarm optimization algorithm to maximize profitability of the HHR process. The optimal process configuration not only meets heating value specification but also utilizes LNG’s cold energy to liquefy the methane-rich stream before pumping to send out pressure and produces ethane and LPG as co-products. Our technoeconomic analyses show that at the current prices of co-products, the HHR process configuration yields 7–10% profit depending on the heating value of the LNG feed.

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Optimization and comparative analysis of LNG regasification processes

Cited by 29 publications

References 29 publications

Improvement of Regasification Process Efficiency for Floating Storage Regasification Unit

Improvement of Regasification Process Efficiency for Floating Storage Regasification Unit

Dynamic Modelling of LNG Powered Combined Energy Systems in Port Areas

Heating Value Reduction of LNG (Liquefied Natural Gas) by Recovering Heavy Hydrocarbons: Technoeconomic Analyses Using Simulation-Based Optimization

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