Thermoeconomic optimization of a cryogenic refrigeration cycle for re-liquefaction of the LNG boil-off gas

Sayyaadi, Hoseyn; Babaelahi, Mojtaba

doi:10.1016/j.ijrefrig.2010.03.008

Cited by 50 publications

(33 citation statements)

References 16 publications

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“…The excessive BOG in the containers gradually increases the pressure of the container. Therefore, there must be effective way to deal with BOG [4]. The best two choices of recycling BOG are directly compressing to the distribution pipelines and liquefying, and the latter is more widely used to recover BOG due to its 30-60% higher energy-utilization efficiency [5].…”

Section: Introductionmentioning

confidence: 99%

Experimental study on performance of BOG compressor

Zhao

Wang

Peng

et al. 2015

IOP Conf. Ser.: Mater. Sci. Eng.

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Abstract:The boil-off gas (BOG) co mpressor is widely used for recycling the excessive boil-off gas of liquefied natural gas (LNG), and the extra -lo w suction temperature brings about great challenges to design of the BOG co mpressor. In this paper, a test system was built to examine the effects of low suction temperature on the co mpressor performance, in which the lowest temperature reached -178℃ by means of a plate-fin heat exchanger with liquefied nitrogen. The test results showed that, as the suction temperature decreased from 20℃ to -150℃ , the volumetric efficiency of the co mpressor dropped by 37.0%, and the power consumption decreased by 10.0%. The preheat of the gas by the pipe through the suction flange to suction valve was larger than 20℃ as the suction temperature was -150℃ , and this value increased with the decreased suction temperature. The pressure loss through the suction valve at lower suction temperature was larger than that at amb ient temperature wh ile the volume flow rate was kept the same.

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Section: Introductionmentioning

confidence: 99%

Experimental study on performance of BOG compressor

Zhao

Wang

Peng

et al. 2015

IOP Conf. Ser.: Mater. Sci. Eng.

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“…Chang Kwang Pil [12] gives an introduction to reliability assessment of re-liquefaction systems for boil-off gas (BOG) on LNG carriers with focus on redundancy optimization and maintenance strategies. Hoseyn Sayyaadi [13] [14] researched that onboard boil-off gas (BOG) re-liquefaction system as a cryogenic refrigeration cycle is utilized in order to re-liquefy the BOG and returns it to the cargo tanks instead of burning it. He also performed the optimization in order to maximize the exergetic efficiency of plant and minimize the unit cost of the system product (refrigeration effect), simultaneously.…”

Section: Introductionmentioning

confidence: 99%

An Analysis of the Greenhouse Gas Emissions by the Re-Liquefaction of Boil-Off Gas of LNG Storage Tank

Sun¹,

Liu²,

Li³

2015

EPE

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The pressure in liquefied natural gas (LNG) storage tank continues to increase due to the heat transfer from ambient air to low temperature LNG, which raises safety concerns. Accordingly, there is increasing interest to explore the technical approaches capable of recovering Boil-Off Gas (BOG) and even eliminating the ventilation of LNG storage tank. This research numerically analyzed the greenhouse gas emissions of the re-liquefaction of BOG using the following four approaches: 1) a Claude cycle driven by electrical motor with the electricity produced by burning coal; 2) a Claude cycle driven by a gas turbine fuelled by BOG released; 3) a Claude cycle driven by a SI engine fuelled by gasoline; 4) burning nature gas directly released by BOG. The impact of heat transfer coefficient, LNG tank configuration, size, and percentage of LNG stored in tank on the rate of BOG and energy needed for the re-liquefaction of methane vapor were investigated. The greenhouse gas emissions (GGE) was examined and compared. The data presented in this paper provide guideline for the management of pressure development in LNG storage tank.

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“…The Joule cycle (Linde cycle) is widely used as a LNG re-liquefaction plant. Many important works about Joule cycles have been published in recent years [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18]. Audun Aspelund et al investigated the problem of liquefied energy chain for transport and utilization of natural gas for power production with CO 2 capture and storage in four different aspects [19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

“…In a recent work performed by authors, a thermoeconomic (exergoeconomic) optimization process of a BOG re-liquefaction refrigeration system with the aim of minimizing the unit cost of the system product was performed [16]. The product of the BOG re-liquefaction system was defined as the refrigeration effect that the system must provide in the BOG condenser [16].…”

Section: Introductionmentioning

confidence: 99%