Analysis and assessment of a novel hydrogen liquefaction process

Yüksel, Yunus Emre; Öztürk, Murat; Dinçer, İbrahim

doi:10.1016/j.ijhydene.2017.03.064

Cited by 81 publications

(13 citation statements)

References 15 publications

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“…ortho-hydrogen and %25 para-hydrogen [3]. The equilibrium ratio of ortho-hydrogen to parahydrogen at the normal boiling point is 0.2%, but the non-catalytic conversion from ortho to para has a very slow rate.…”

Section: Ortho-para Hydrogen Conversionmentioning

confidence: 94%

“…Therefore, if hydrogen liquefaction carried out without an ortho-para catalytic conversion, the ortho state will have much more concentration than its equilibrium concentration and it will be converted spontaneously to para state [14]. The conversion reaction of the ortho-para conversion are set as follows [3]:…”

Section: Ortho-para Hydrogen Conversionmentioning

confidence: 99%

“…Attempts were carried out to design and develop more effective cycles to liquefy H 2 [2,3] and several methods were proposed to increase the cooling efficiency of H 2 liquefaction process, for instance; an MR refrigeration cycle with various refrigerants was proposed as a pre-cooling cycle to pre-cool H 2 from 25 o C to -193 o C [2,[4][5][6][7][8]. Utilizing the cold energy of LNG in the regasification process was another way to pre-cool H 2 [9].…”

mentioning

confidence: 99%

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Exergy, exergoeconomic and exergoenvironmental assessments and optimization of a novel solar cascade organic Rankine cycle assisted hydrogen liquefaction cycle

Boyaghchi

Sohbatloo

2019

Scientia Iranica

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In this research, a combined cascade organic Rankine cycle (CORC) and ejector refrigeration loops incorporated with the concentrating linear Fresnel solar collector (LFSC) is proposed as a pre-cooling section to reduce electricity work consumption in a mixed refrigerant (MR) hydrogen liquefaction process. The exergy, exergoeconomic and exergoenvironmental analyses of the system during a year and special days are conducted in detail. Moreover, the annual thermodynamic, economic and environmental impact (EI) performances of the proposed system are evaluated by varying the substantial design parameters. Parametric study indicates that increasing the back pressure of turbine in the low temperature (LT) loop improves all aforementioned performances of the system. Meanwhile, bi-objective optimization based on nondominated sorting genetic algorithm (NSGA-II) and LINMAP, TOPSIS and Shannon entropy decision makers are used to ascertain the optimum COP Ex and economic/EI factors of the system concerned. Referring to the results, COP Ex is improved by 10% and the cost and EI per exergy

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Section: Ortho-para Hydrogen Conversionmentioning

confidence: 94%

Section: Ortho-para Hydrogen Conversionmentioning

confidence: 99%

mentioning

confidence: 99%

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Exergy, exergoeconomic and exergoenvironmental assessments and optimization of a novel solar cascade organic Rankine cycle assisted hydrogen liquefaction cycle

Boyaghchi

Sohbatloo

2019

Scientia Iranica

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“…Conceptual cycles were developed for hydrogen cooling down to reach −253°C from −193°C . The possibility of using a supercritical hydrogen liquefaction plant cooled by helium refrigeration cycles has been investigated, revealing that the hydrogen feed pressure has direct correlation with the process efficiency . The effect of adding absorption precooling cycle for hydrogen liquefaction, powered by the geothermal energy, has been studied …”

Section: Introductionmentioning

confidence: 99%

“…8,21 MR cycles were applied as pre-cooling cycles of hydrogen cooling down from room temperature to −193 C. 19,22,23 Conceptual cycles were developed for hydrogen cooling down to reach −253 C from −193 C. 19 The possibility of using a supercritical hydrogen liquefaction plant cooled by helium refrigeration cycles has been investigated, revealing that the hydrogen feed pressure has direct correlation with the process efficiency. 24 The effect of adding absorption precooling cycle for hydrogen liquefaction, powered by the geothermal energy, has been studied. 25 The most common methods for producing hydrogen are steam methane reforming, coal gasification, and water electrolysis.…”

Section: Introductionmentioning

confidence: 99%

A novel integrated hydrogen and natural gas liquefaction process using two multistage mixed refrigerant refrigeration systems

2019

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Summary The development and analysis of combined hydrogen and natural gas liquefaction process are reported. Two refrigeration cycles using mixed refrigerants (MRs) are employed. The developed process is capable of generating 290 tons hydrogen and 296 tons liquid natural gas on daily basis. The first refrigeration cycle of the introduced process liquefies 3.5 kg·s−1 normal gaseous hydrogen and 3.5 kg·s−1 normal natural gas at room temperature and 21 bar to −195°C with the consumed power of 0.643 kWh/kgLH2,kgLNG. The second refrigeration cycle cools down the hydrogen and natural gas to −253°C with the consumed power of 1.662 kWh/kgLH2,kgLNG, leading to a lower total consumed power than that of the identical liquefaction processes. The use of novel and appropriately mixed refrigerants based on the configuration, and the thermal design of expanders and heat exchangers fora wide range of temperatures are the innovations of the process. Additionally, the refrigerant compositions of refrigeration cycles are novel. The energy analysis indicated that the coefficient of performance (COP) for the developed process is 0.2442, which is notably high compared with the COP of other identical processes (typically less than 0.1797). The exergy analysis revealed that the overall exergy efficiency of the liquefaction process is 62.54%. Highlight edited A novel integrated hydrogen and natural gas liquefaction process is introduced. The process can generate 290 tons hydrogen and 296 tons liquid natural gas per day. Total power consumptions of the process are 4.165 kWh/kgLH2,kgLNG. Coefficient of performance (COP) for the developed process is 0.2442, which is notably high compared with the COP of other identical processes. Overall exergy efficiency of the liquefaction process is 62.54%.

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Energy‐Efficient Hydrogen Liquefaction Process with Ortho‐Para Conversion and Boil‐Off Gas Recovery

Wen,

Xie,

Zhao

et al. 2024

Chem Eng & Technol

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Hydrogen liquefaction is essential for the efficient storage and transportation of hydrogen. In the liquefaction process, catalytic ortho‐para conversion is crucial to achieve a product with at least 95 % para‐hydrogen to reduce boil‐off losses. The proposed hydrogen liquefaction process using a catalyst‐filled heat exchanger for continuous ortho‐para conversion is modeled through steady‐state thermal simulations in Aspen HYSYS. Additionally, an ejector is integrated to reliquefy boil‐off gas. The proposed design achieves a specific energy consumption (SEC) of 10.50 kWh ()−1 and an exergy efficiency (EXE) of 30.1 %, which is 18 % lower in SEC compared to processes with separate converters. The integrated approach enhances energy utilization and offers references for future hydrogen liquefiers.

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Analysis and assessment of a novel hydrogen liquefaction process

Cited by 81 publications

References 15 publications

Exergy, exergoeconomic and exergoenvironmental assessments and optimization of a novel solar cascade organic Rankine cycle assisted hydrogen liquefaction cycle

Exergy, exergoeconomic and exergoenvironmental assessments and optimization of a novel solar cascade organic Rankine cycle assisted hydrogen liquefaction cycle

A novel integrated hydrogen and natural gas liquefaction process using two multistage mixed refrigerant refrigeration systems

Energy‐Efficient Hydrogen Liquefaction Process with Ortho‐Para Conversion and Boil‐Off Gas Recovery

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