Integrated hydrogen liquefaction processes with LNG production by two-stage helium reverse Brayton cycles taking industrial by-products as feedstock gas

Xu, Jingxuan; Lin, Wensheng

doi:10.1016/j.energy.2021.120443

Cited by 38 publications

(7 citation statements)

References 49 publications

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“…Results showed that the purities of LNG in these systems were over 99.99%, and the Specific Energy Consumptions (SEC) were between 18.01 and 41.72 kWh/kmol. In another study, Xu et al [10] developed three integrated structures for the simultaneous generation of LH 2 and LNG using the helium reverse Brayton cycle from the feed containing hydrogen and methane gases. These systems' energy consumption and exergy efficiencies were 21.94-54.78 kWh/kmol (feedstock gas) and 13-66.5%.…”

Section: Introductionmentioning

confidence: 99%

New Integrated Process for the Efficient Production of Methanol, Electrical Power, and Heating

2022

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In this paper, a novel process is developed to cogenerate 4741 kg/h of methanol, 297.7 kW of electricity, and 35.73 ton/h of hot water, including a hydrogen purification system, an absorption–compression refrigeration cycle (ACRC), a regenerative Organic Rankine Cycle (ORC), and parabolic solar troughs. The heat produced in the methanol reactor is recovered in the ORC and ACRC. Parabolic solar troughs provide thermal power to the methanol distillation tower. Thermal efficiencies of the integrated structure and the liquid methanol production cycle are 78.14% and 60.91%, respectively. The process’s total exergy efficiency and irreversibility are 89.45% and 16.89 MW. The solar thermal collectors take the largest share of exergy destruction (34%), followed by heat exchangers (30%) and mixers (19%). Based on the sensitivity analysis, D17 (mixture of H2 and low-pressure fuel gas before separation) was the most influential stream affecting the performance of the process. With the temperature decline of stream D17 from −139 to −149 °C, the methanol production rate and the total thermal efficiency rose to 4741.2 kg/h and 61.02%, respectively. Moreover, the growth in the hydrogen content from 55% to 80% molar of the feed gas, the flow rate of liquid methanol, and the total exergy efficiency declined to 4487 kg/h and 86.05%.

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Section: Introductionmentioning

confidence: 99%

New Integrated Process for the Efficient Production of Methanol, Electrical Power, and Heating

2022

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“…H 2 is the supply chain’s most promising clean and green energy fuel. H 2 production, storage, and usage systems can be integrated with cogeneration plants. , This integration leads to higher efficiency, lower environmental influence, and lower expenses. , Also, some integrated structures were developed for H 2 purification, but no solutions were provided for its storage. , The H 2 production and storage processes can be integrated with nuclear power plants, − renewable heat sources, − and waste heat from industries (i.e., chemical plants, furnaces, and incinerators). − Besides, several combined structures were developed for H 2 purification and its liquefaction from coke oven gas (COG) and LNG production. ,− Xu et al developed four cycles for producing LNG and liquid H 2 , containing closed-loop N 2 , closed-loop H 2 , open-loop N 2 , and open-loop H 2 . The outcomes demonstrated that the system purity and SEC were 99.99% and 18.01–41.2 kWh/kmol, respectively.…”

Section: Different Methods To Improve the Performance Of Hydrogen Liq...mentioning

confidence: 99%

“…The outcomes demonstrated that the system purity and SEC were 99.99% and 18.01–41.2 kWh/kmol, respectively. Xu et al 358 investigated three innovative systems for cogenerating liquid H 2 and LNG based on the COG. A two-step helium expansion process supplied the cooling needed to liquefy H 2 .…”

Section: Different Methods To Improve the Performance Of Hydrogen Liq...mentioning

confidence: 99%

Strategies To Improve the Performance of Hydrogen Storage Systems by Liquefaction Methods: A Comprehensive Review

et al. 2023

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The main challenges of liquid hydrogen (H2) storage as one of the most promising techniques for large-scale transport and long-term storage include its high specific energy consumption (SEC), low exergy efficiency, high total expenses, and boil-off gas losses. This article reviews different approaches to improving H2 liquefaction methods, including the implementation of absorption cooling cycles (ACCs), ejector cooling units, liquid nitrogen/liquid natural gas (LNG)/liquid air cold energy recovery, cascade liquefaction processes, mixed refrigerant systems, integration with other structures, optimization algorithms, combined with renewable energy sources, and the pinch strategy. This review discusses the economic, safety, and environmental aspects of various improvement techniques for H2 liquefaction systems in more detail. Standards and codes for H2 liquefaction technologies are presented, and the current status and future potentials of H2 liquefaction processes are investigated. The cost-efficient H2 liquefaction systems are those with higher production rates (>100 tonne/day), higher efficiency (>40%), lower SEC (<6 kWh/kgLH2), and lower investment costs (1–2 $/kgLH2). Increasing the stages in the conversion of ortho- to para-H2 lowers the SEC and increases the investment costs. Moreover, using low-temperature waste heat from various industries and renewable energy in the ACC for precooling is significantly more efficient than electricity generation in power generation cycles to be utilized in H2 liquefaction cycles. In addition, the substitution of LNG cold recovery for the precooling cycle is associated with the lower SEC and cost compared to its combination with the precooling cycle.

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“…The main challenges for liquid hydrogen are the high capital costs and energy consumption to liquefy the hydrogen (30% of the energy carried in the hydrogen [7]), low volumetric density, and the fact that most hydrogen liquefaction processes use helium. Helium is produced as a by-product of the oil and gas industry, and by phase-out of oil and gas, helium will become a rare commodity [8,9]. The main issues with ammonia, methanol and LOHC are the high capital cost, and the fact that around 30% of the energy transported will be required to transform these molecules back into hydrogen [10].…”

Section: Introductionmentioning

confidence: 99%

Hydrogen Balloon Transportation: A Cheap and Efficient Mode to Transport Hydrogen

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Integrated hydrogen liquefaction processes with LNG production by two-stage helium reverse Brayton cycles taking industrial by-products as feedstock gas

Cited by 38 publications

References 49 publications

New Integrated Process for the Efficient Production of Methanol, Electrical Power, and Heating

New Integrated Process for the Efficient Production of Methanol, Electrical Power, and Heating

Strategies To Improve the Performance of Hydrogen Storage Systems by Liquefaction Methods: A Comprehensive Review

Hydrogen Balloon Transportation: A Cheap and Efficient Mode to Transport Hydrogen

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