Dynamic simulation of a single nitrogen expansion cycle for natural gas liquefaction under refrigerant inventory operation

Yu, Zhan; Wang, Jian; Wang, Wei; Wang, Rongshun

doi:10.1016/j.applthermaleng.2017.08.033

Cited by 13 publications

(4 citation statements)

References 35 publications

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“…Through thermodynamic simplification, Michelsen et al [21] proposed a dynamic system model for the control of the TEALARC process. Zhan et al [22] carried out a simulation of a cryogenic N2 expansion cycle. The calculation of heat exchanger was illustrated detailly, but the matching performance of turboexpander was simplified.…”

Section: Introductionmentioning

confidence: 99%

Simulation and Evaluation on the Dynamic Performance of a Cryogenic Turbo-Based Reverse Brayton Refrigerator

2019

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In this study, a cryogenic turbo-based refrigerator, with high-speed foil gas bearing turboexpander and plate-fin heat exchanger, was presented. For the cooling process of a cryogenic refrigerator is long and complex, the efficient simulation of the dynamic performance is vital for its evaluation and operation. It is difficult to achieve this purpose. Because the cryogenic refrigerator will go through great temperature changes, resulting in dynamic performances of components going to complexity. In this article, the turboexpander was simulated using CFX, and the matching models with expansion works of consumption and utilization were unified and modified. With numerical calculation of heat exchanger, the dynamic simulation model of the refrigerator was improved via MATLAB code. The calculation method of the required input energy of the refrigerator in cooling processes was proposed based on the simulation and integration. The energy efficiency and economy cost of the refrigerator were evaluated under different operation modes. The refrigerator with a motor was more stable than the one with a blower. The refrigerator was tested under different conditions, the results of which agreed well with simulation data. The simulation method is efficient to serve practical applications, improve energy efficiency and reduce costs.

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Section: Introductionmentioning

confidence: 99%

Simulation and Evaluation on the Dynamic Performance of a Cryogenic Turbo-Based Reverse Brayton Refrigerator

2019

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“…Comparatively, the N2-expander-based process uses N2 as a refrigerant that is maintained in the gaseous state throughout the process, which makes it safer and simpler, but has high operating costs, which is the major issue so far [20]. However, the selection of the liquefaction process highly depends on the energy efficiency, environmental impact, capacity of the system, and complexity [28,141]. A detailed description and analysis of the conventional liquefaction processes (at both large scale and small scale) can be found in the literature [28,142,143].…”

Section: Liquefied Biomethane (Lbm)mentioning

confidence: 99%

Biogas to liquefied biomethane: Assessment of 3P's–Production, processing, and prospects

Qyyum

Haider

Qadeer

et al. 2020

Renewable and Sustainable Energy Reviews

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“…The heat from friction and the pressure drop gradient in the equation of momentum were negligible. These can be validated by the three-dimensional CFD method [10]. With the assumptions, conservation laws of the mass and momentum were satisfied, and only the energy conservation equation needed to be resolved [10,11].…”

Section: Heat Transfer Characteristicsmentioning

confidence: 99%

“…Kays and London et al [9] specialized in the experimental study of compact surface, and their famous literature contained the experimental data of 56 types of plate fin surface. Zhan et al [10] performed numerical simulation of a cryogenic heat exchanger in nitrogen expansion cycle. With the application in gas separation and liquefaction plant, the research of plate-fin heat exchanger has been developed rapidly.…”

Section: Introductionmentioning

confidence: 99%

Influence of Frost Growth and Migration in Cryogenic Heat Exchanger on Air Refrigerator

et al. 2019

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Frost formation degrades the performance of heat exchangers greatly, thus influencing the cryogenic refrigerator. Different from frost formation on the evaporator surface, the growth and migration of frost layer inside the heat exchanger is of low temperature and humidity. In addition to the constantly changing boundary conditions, the effective prediction is difficult. In the present study, a numerical model was proposed to analyze the frost formation in the cryogenic heat exchanger of a reverse Brayton air refrigerator. Under small amounts of moisture, the growing of frost layer was simulated through the numerical heat and mass transfer by adopting semiempirical correlations. The frost formation model was inserted into the transient model of refrigerator, and numerical calculations were performed on heat and mass transfer rates, and growth and migration of frost layers in forced convection conditions. Experiments were conducted under different air humidity to investigate the frost formation and verify the numerical model. Through the model, the influences of frosting on the refrigerator were evaluated under different moisture contents and running time. It can be used to predict the performance of air refrigerators with low humidity and provide a basis for improving the system operation and efficiency.

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Dynamic simulation of a single nitrogen expansion cycle for natural gas liquefaction under refrigerant inventory operation

Cited by 13 publications

References 35 publications

Simulation and Evaluation on the Dynamic Performance of a Cryogenic Turbo-Based Reverse Brayton Refrigerator

Simulation and Evaluation on the Dynamic Performance of a Cryogenic Turbo-Based Reverse Brayton Refrigerator

Biogas to liquefied biomethane: Assessment of 3P's–Production, processing, and prospects

Influence of Frost Growth and Migration in Cryogenic Heat Exchanger on Air Refrigerator

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