Comparative design, thermodynamic and techno‐economic analysis of utilizing liquefied natural gas cold energy for hydrogen liquefaction processes

Noh, Wonjun; Park, Sihwan; Kim, Junghwan; Lee, Inkyu

doi:10.1002/er.8064

Cited by 21 publications

(5 citation statements)

References 50 publications

(69 reference statements)

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“…The LNG cold recovery process in the precooling of the H 2 liquefaction cycle can be used alone or integrated with other precooling cycles (MRC and SRC precooling). Noh et al 223 designed two new configurations of H 2 liquefaction using the regasification recovery of LNG in the precooling stage. To precool the H 2 liquefaction system, the first structure alone employs the regasification process, while the second employs a combination of the regasification operation and mixed refrigerant systems.…”

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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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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“…42 In addition, operating expenses are decreased. 43 If the gap between the composite curves is wide, then a smaller heat exchange area is required because of the large driving force of the heat exchange. The advantage is that capital expenses are decreased.…”

Section: Optimization and Analysis Methodologymentioning

confidence: 99%

“…If the gap between the hot and cold composite curves is narrow, the heat exchange efficiency increases owing to its decreasing irreversibility . In addition, operating expenses are decreased . If the gap between the composite curves is wide, then a smaller heat exchange area is required because of the large driving force of the heat exchange.…”

Section: Optimization and Analysis Methodologymentioning

confidence: 99%

Advanced Design of Ammonia Production Processes from LNG: Efficient and Economical Cold Energy Utilization Methods

Kim

Mun

et al. 2023

Ind. Eng. Chem. Res.

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Efficient green energy technologies are essential for sustainable green hydrogen applications. However, economic reasons necessitate bridging technologies between fossil fuels and green hydrogen. Natural gas, the cleanest fossil fuel, can provide non-carboncontaining energy resources, such as hydrogen and ammonia. Ammonia is suitable for economical hydrogen storage and transportation and for direct use as a fuel. In this study, efficient liquefied natural gas (LNG) cold energy utilization and recovery methods developed for producing ammonia are Design 1: energy production in an organic Rankine cycle and Design 2: energy reduction in an air separation unit (ASU). In Design 1, LNG cold energy is converted into power and supplied to the nitrogen compression stage for synthesizing ammonia. In Design 2, LNG cold energy is directly provided to the ASU to reduce the outlet temperature of nitrogen, which is sent to the compression stage, and the compression energy is consequently reduced. Through thermodynamic analysis, the process of LNG cold energy recovery is determined, and the energy consumption in each design is compared. Techno-economic analysis presents the cost reduction in the levelized cost of ammonia (LCOA). Compared with the base case, the energy consumption and LCOA in Design 2 are reduced by 11.54 and 23.02%, respectively.

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“…Bare module factor Water tank [19] 1.3 Heat exchanger [23] 3.17 Chemical engineering plant cost index (CEPCI) [24] 2022 (Base year) 806.3 2021 (Steam) 686.7 2014 (Tank) 576.1 1996 (Shell-and-tube type exchanger) 382.0…”

Section: Parameter Valuementioning

confidence: 99%

Advanced Design of Integrated Heat Recovery and Supply System Using Heated Water Storage for Textile Dyeing Process

et al. 2022

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Heat recovery from a high-temperature wastewater is the major concern in the conventional textile industry. However, limited space in the textile plant is an important constraint for the process enhancement. Therefore, an easily applicable heat recovery system with a small amount of additional equipment to the existing dyeing process is required. To meet the needs from the industry, this study suggests an integrated heat recovery and supply system consisting of single heat exchanger and single storage tank using freshwater as a thermal carrier to utilize the reusable heat in the wastewater. Freshwater is stored in a tank after direct heat exchange with wastewater and is supplied to the next dyeing process. Three different designs of the integrated system were compared based on the lower limit of the wastewater temperature: above 50 °C, 40 °C, and 30 °C for Cases 1, 2, and 3, respectively. The energy and energy flow analyses showed Case 2 to be well balanced between the quality and quantity of the recovered heat, and there was no heat loss via drainage. The heat demand for Case 2 was 795.5 kW, which was the lowest among all cases. Furthermore, an economic analysis showed that the total cost for Case 2 was reduced by 63.2% compared with the base case. Despite the use of an additional heat exchanger and water storage tank, the proposed system was more economical because of the reduced operating costs. Finally, a detailed analysis was conducted by determining the more efficient temperature for heat recovery and supply.

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Comparative design, thermodynamic and techno‐economic analysis of utilizing liquefied natural gas cold energy for hydrogen liquefaction processes

Cited by 21 publications

References 50 publications

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

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

Advanced Design of Ammonia Production Processes from LNG: Efficient and Economical Cold Energy Utilization Methods

Advanced Design of Integrated Heat Recovery and Supply System Using Heated Water Storage for Textile Dyeing Process

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