Multi-objective optimization of hydrogen liquefaction process integrated with liquefied natural gas system

Bae, Ju-Eon; Wilailak, Supaporn; Yang, Jae-Hyeon; Yun, Dong-Yeol; Zahid, Umer; Lee, Chul‐Jin

doi:10.1016/j.enconman.2021.113835

Cited by 58 publications

(11 citation statements)

References 26 publications

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“…Mafi et al ,− conducted a comprehensive study on recognizing the behavior of mixed refrigerant refrigerating systems, identifying and investigating their important and key parameters, and optimizing their arrangement using nonlinear mathematical methods. Next, meta-heuristic algorithms were used to reduce the SEC in low-temperature natural gas , and H 2 liquefaction systems. , Table lists the characteristics of the hybrid H 2 liquefaction system that have been optimized using trial and error (TE) methods, sequential quadratic programming (SQP), knowledge-based optimization (KBO), particle swarm optimization (PSO), GA, and modified coordinate descent (MCD) combined with artificial neural networks (ANN).…”

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

confidence: 99%

“…Several strategies have been utilized to decrease the SEC in H 2 liquefaction systems. These techniques include using absorption and ejector cooling cycles, − LN 2 regasification, ,− LNG/LAC energy recovery, ,− cascade liquefaction process, ,, multicomponent refrigerant cycle, − integration with other integrated structures, , optimization algorithms, , combined with renewable energy sources, − and the pinch approach. , Yilmaz et al developed seven H 2 production and liquefaction cycles according to geothermal energy, the absorption cooling cycle (ACC) to precooling, and the L–H process for liquefaction. The price of H 2 liquefaction was calculated to be 0.98–2.62 $/kgLH 2 .…”

Section: Introductionmentioning

confidence: 99%

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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%

Section: Introductionmentioning

confidence: 99%

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

et al. 2023

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“…They showed that compared with the hydrogen liquefaction process without LNG cold energy, the total specific cost of liquefaction of the proposed design decreased by approximately 7.7%. Bae et al 25 conducted a multiobjective optimization using a genetic algorithm that considered both generated carbon dioxide and energy savings by utilizing LNG in hydrogen liquefaction processes. They suggested quantitative decision-making processes for trade-offs between economic demand and carbon dioxide emissions.…”

Section: Introductionmentioning

confidence: 99%

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

Noh

Park

Kim

et al. 2022

Intl J of Energy Research

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Summary This study mainly focuses on determining the optimal configuration that efficiently utilizes liquefied natural gas (LNG) cold energy in hydrogen precooling for liquid hydrogen production. To achieve this goal, two different configurations are designed: (a) adding LNG cold energy to the existing hydrogen precooling cycle and (b) replacing the existing hydrogen precooling cycle with LNG cold energy. An equilibrium hydrogen model is developed to reflect the thermodynamic property of ortho‐para conversion of hydrogen. Bayesian optimization is performed to determine the optimal operating conditions which minimize the specific energy consumption for all configurations. The specific energy consumption of the configuration involving hydrogen precooling with only LNG is 5.613 kWh/kg‐LH2, and it is reduced by 8.13% and 3.19% from the base case design and the configuration involving hydrogen precooling with both LNG and a mixed refrigerant cycle, respectively. In addition, a techno‐economic analysis is conducted. Compare to the base case design, the capital cost and operating cost of the design replacing hydrogen precooling with LNG are reduced by 31.76% and 11.55%, respectively. This study shows that the proposed design of replacing the hydrogen precooling cycle with an LNG stream can save energy consumption, moreover, it is highly effective for capital investment saving due to its simple configuration.

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“…To find an optimal operating condition, the entire process of hydrogen production, liquefaction and CO 2 liquefaction was optimized. Bae et al [16] also attempted to combine the hydrogen liquefaction and LNG regasification processes and conducted a multi-objective optimization that minimized the amount of energy consumed and CO 2 emitted. Yang et al [17] designed a process that used LNG, the LN 2 Brayton cycle, and the GH 2 Brayton cycle to liquefy hydrogen and improve the amount of energy consumed and the economic feasibility of the process.…”

Section: Introductionmentioning

confidence: 99%

Efficient Heat Exchange Configuration for Sub-Cooling Cycle of Hydrogen Liquefaction Process

et al. 2022

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The hydrogen liquefaction process is highly energy-intensive owing to its cryogenic characteristics, and a large proportion of the total energy is consumed in the subcooling cycle. This study aimed to develop an efficient configuration for the subcooling cycle in the hydrogen liquefaction process. The He-Ne Brayton cycle is one of the most energy-efficient cycles of the various proposed hydrogen liquefaction processes, and it was selected as the base case configuration. To improve its efficiency and economic potential, two different process configurations were proposed: (configuration 1) a dual-pressure cycle that simplified the process configuration, and (configuration 2) a split triple-pressure cycle that decreased the flow rate of the medium- and high-pressure compressors. The ortho–para conversion heat of hydrogen is considered by using heat capacity data of equilibrium hydrogen. Genetic algorithm-based optimization was also conducted to minimize the energy consumption of each configuration, and the optimization results showed that the performance of configuration 1 was worse than that of the base case configuration. In this respect, although less equipment was used, the compression load on each compressor was very intensive, which increased the energy requirements and costs. Configuration 2 provided the best results with a specific energy consumption of 5.69 kWh/kg (3.2% lower than the base case configuration). The total expense of configuration 2 shows the lowest value which is USD 720 million. The process performance improvements were analyzed based on the association between the refrigerant composition and the heat exchange efficiency. The analysis demonstrated that energy efficiency and costs were both improved by dividing the pressure levels and splitting the refrigerant flow rate in configuration 2.

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Multi-objective optimization of hydrogen liquefaction process integrated with liquefied natural gas system

Cited by 58 publications

References 26 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

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

Efficient Heat Exchange Configuration for Sub-Cooling Cycle of Hydrogen Liquefaction Process

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