Novel propane-free mixed refrigerant integrated with nitrogen expansion natural gas liquefaction process for offshore units

Jin, Chunhe; Yuan, Yilong; Son, Heechang; Lim, Young-Jin

doi:10.1016/j.energy.2021.121765

Cited by 22 publications

(4 citation statements)

References 46 publications

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“…[-100, 100] 0 20,20] 0 According to the test results, in the application of f1(x), f2(x), and f5(x), the performance of EHR-GWO-GA is better than that of GA in terms of the accuracy of the optimal solution and the convergence speed. In the application of f3(x), f4(x), and f6(x), EHR-GWO-GA avoids the problem of locally optimal solutions in the process of using GA.…”

Section: Test Function Nmentioning

confidence: 99%

“…However, this paper continues to use the single-objective optimization method. Jin et al [20] proposed a novel liquefaction process that integrates propane-free mixed refrigerant and nitrogen expander cycles (MR-N2) and the unit energy consumption as the objective using GA to find the optimal decision variables. Li et al [21] studied an improved refrigeration system and optimized it using GA with specific energy consumption as the objective, followed by exergy and energy analyses.…”

Section: Introductionmentioning

confidence: 99%

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A New Multi-Objective Optimization Strategy for Improved C3MR Liquefaction Process

Cui,

Pan,

Pang

et al. 2024

Processes

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In the traditional C3MR process (T-C3MR), the boiling gas (BOG) output from the last stage of the gas–liquid separator is directly discharged, in which the excellent low-temperature capability is not utilized, and the system efficiency is decreased. In liquefied natural gas (LNG), single-objective optimization methods are commonly used to optimize system parameters, which may result in incomplete system analysis. To solve the above problems, this paper proposes a multi-objective optimization strategy for the improved C3MR process(I-C3MR) based on a new multi-objective optimization algorithm called EHR-GWO-GA. Firstly, the main work proposes an I-C3MR structure. Secondly, an optimization strategy of the I-C3MR with the maximization of liquefaction amount, minimization of unit energy consumption and minimization of exergy loss as objective functions are proposed. Based on the optimization results, the influence of decision variables on liquefaction amount, unit energy consumption and exergy loss are analyzed, and the results show that the decision variables have good adaptability. Finally, a detailed exergy analysis of the equipment used is made, and the results show that the main exergy losses come from the water coolers and compressors, accounting for 32% and 34%, respectively. Compared to the T-C3MR, the improved C3MR based on EHR-GWO-GA(E-C3MR) has an approximate 8% increase in liquefaction amount—a roughly 23% decrease in unit energy consumption and a decrease of nearly 24% in exergy loss.

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Section: Test Function Nmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A New Multi-Objective Optimization Strategy for Improved C3MR Liquefaction Process

Cui,

Pan,

Pang

et al. 2024

Processes

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“…After this, the natural gas passes a single step of expansion to low pressure, and this provides the cooling effect that is needed for liquefaction [34]. Expander operations are simple, dependable, and run readily, without hazards connected with flammable work-ing fluids; however, there is a disadvantage as nitrogen expander methods have lower energy efficiency than other liquefaction methods [35]. The International Gas Union (IGU) reported that global LNG trade has seen a low increase of 1.4 MT from 2019 to 356.1 MT in 2020.…”

Section: Natural Gas Liquefactionmentioning

confidence: 99%

Liquefied Natural Gas Value Chain: A Comprehensive Review and Analysis

Shingan,

Banerjee,

Kumawat

et al. 2023

Chem Eng & Technol

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Over the past few decades, the liquefied natural gas (LNG) business has experienced astounding expansion and gained global relevance. LNG has emerged as a key element in meeting the world's rising energy demand while working to cut carbon emissions, since it is a cleaner and more adaptable energy source. The entire process from natural gas extraction to consumption is covered in the presented analysis of the LNG value chain, starting out by looking at the discovery and production of natural gas reserves, highlighting important innovations and methods used during the extraction stage. The procedures used to treat and purify natural gas in order to meet the strict standards for liquefaction are detailed. Analysis of the liquefaction process reveals numerous liquefaction technologies, e.g. the well‐known conventional liquefaction and the cutting‐edge floating LNG and small‐scale LNG facilities. LNG storage and transportation, as critical components in the value chain, are examined in great detail. When the LNG reaches its destination, regasification plays a crucial role in repurposing it as a gas for distribution and consumption. Regasification technologies, such as conventional onshore terminals, floating storage and regasification units, and land‐based regasification facilities, are covered. Concerns regarding methane emissions and the carbon footprint, the potential for reducing greenhouse gas emissions through new technology, the environmental impact of LNG, and the economics of LNG are also considered across its value chain.

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“…The results demonstrated that the consideration of exergy within optimization yielded better results, with 7.1% less energy consumption, 9.5% less exergy destruction, and exergy efficiency 4.4% higher. Jin et al [15] discussed a liquefaction process that used propane-free mixed refrigerant and nitrogen expander cycles, with an increase of 27.15% in liquefaction efficiency and an increase of 14.92% in exergy efficiency, in comparison with the baseline. In exergoeconomic assessments, the relative cost difference is a parameter that identifies the potential of improvement of each component.…”

Section: Introductionmentioning

confidence: 99%

Tackling Dissipative Components Based on the SPECO Approach: A Cryogenic Heat Exchanger Used in Natural Gas Liquefaction

Cavalcanti

Carvalho

2021

Energies

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The cryogenic industry has been experiencing continuous progress in recent years, primarily due to the global development of oil and gas activities. Natural gas liquefaction is a cryogenic process, with the refrigeration system being crucial to the overall process. The objective of the study presented herein is to carry out an exergoeconomic assessment for a dual nitrogen expander process used to liquefy natural gas, employing the SPecific Exergy COsting (SPECO) methodology. The air coolers and throttling valve are dissipative components, which present fictitious unit cost rates that are reallocated to the final product (Liquefied Natural Gas). The liquefaction process has an exergy efficiency of 41.89%, and the specific cost of liquefied natural gas is 292.30 US$/GJ. It was verified that this cost increased along with electricity. The highest exergy destruction rates were obtained for Expander 1 and Air cooler 2. The highest average cost per exergy unit of fuel was obtained for the vertical separator, followed by Air coolers 1 and 2. An assessment of the exergoeconomic factor indicated that both expanders could benefit from a decrease in exergy destruction, improving the exergoeconomic performance of the overall system. Regarding the relative cost difference, all compressors presented high values and can be enhanced with low efforts.

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Novel propane-free mixed refrigerant integrated with nitrogen expansion natural gas liquefaction process for offshore units

Cited by 22 publications

References 46 publications

A New Multi-Objective Optimization Strategy for Improved C3MR Liquefaction Process

A New Multi-Objective Optimization Strategy for Improved C3MR Liquefaction Process

Liquefied Natural Gas Value Chain: A Comprehensive Review and Analysis

Tackling Dissipative Components Based on the SPECO Approach: A Cryogenic Heat Exchanger Used in Natural Gas Liquefaction

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