Automatically varying the composition of a mixed refrigerant solution for single mixed refrigerant LNG (liquefied natural gas) process at changing working conditions

Xu, Xiongwen; Liu, Jinping; Cao, Le; Pang, Weiqiang

doi:10.1016/j.energy.2013.10.040

Cited by 35 publications

(7 citation statements)

References 18 publications

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“…Manipulation of the refrigerant composition can thus be used to open the pinch in a particular temperature range, for example, to ensure feasibility in the MSHE. This strategy is consistent with the methods proposed by Khan et al and Xu et al…”

Section: Analysis Of the Prico Smr Cyclesupporting

confidence: 90%

“…Also, the works from Khan et al and Xu et al provide an effective procedure to manipulate the composition of the mixed refrigerant (which is a key degree of freedom), although only applied to the PRICO cycle. In other works, − information about the optimal refrigerant composition obtained from pinch and exergy analysis is usually limited.…”

Section: Previous Workmentioning

confidence: 99%

“…Xu et al 28 also proposed an iterative procedure to achieve a high energy efficiency in the PRICO cycle. The focus is, however, on a control strategy to adequately manipulate the refrigerant composition to maintain feasibility for various changing operating conditions, for example, ambient temperature and natural gas pressure.…”

Section: Previous Workmentioning

confidence: 99%

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Structural Modifications on Single Mixed Refrigerant Cycles for Performance Improvements in Small-Scale LNG Processes

Almeida‐Trasvina

Smith

2022

Ind. Eng. Chem. Res.

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Production of liquefied natural gas (LNG) at a small scale typically relies on single mixed refrigerant (SMR) cycles to provide the necessary refrigeration. The shaft power required for refrigerant compression is by far the largest contributor to the operating costs of the entire LNG plant. The highly nonlinear interactions between operating variables mean that the optimization of these SMR cycles is very challenging. Current design methodologies for SMR cycles mostly rely on stochastic search algorithms to search the solution space. However, the quality of the results obtained from these methodologies is difficult to assess. Exergy analysis can be performed, but it provides limited information. This work provides a thermodynamic-based analysis to minimize the shaft power demand. Four different SMR cycle configurations are studied in one case study. The analysis brings insights regarding their optimized conditions, including the refrigerant composition. These insights are demonstrated to be useful with a second case study, which is used to develop effective design methodologies for SMR cycles. Overall, the analysis of structural modifications to SMR cycles in this work enables a more fundamental understanding of their optimal design for high energy efficiency.

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Section: Analysis Of the Prico Smr Cyclesupporting

confidence: 90%

Section: Previous Workmentioning

confidence: 99%

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Structural Modifications on Single Mixed Refrigerant Cycles for Performance Improvements in Small-Scale LNG Processes

Almeida‐Trasvina

Smith

2022

Ind. Eng. Chem. Res.

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“…The results showed that the robustness of the mixed refrigerant composition was very strong because the exergy efficiency was maintained at about 0.40, even though the ratio of the mixed refrigerant was restrained. Xu et al (2013) and Xu et al (2014) investigated the performance diagnosis mechanism for the single mixed refrigerant (SMR) process. A control strategy was then proposed to control the changes in the working refrigerant composition under different working conditions.…”

Section: Introductionmentioning

confidence: 99%

Review of Unconventional Natural Gas Liquefaction Processes

Lin

Chen

et al. 2022

Front. Energy Res.

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Liquefied natural gas (LNG) has become an important part in the energy industry on account of its high energy density, low carbon emission, and convenient transportation. In recent years, with the discovery of unconventional natural gas resources, the situation of the world’s natural gas liquefaction plants using conventional natural gas as feedstock is changing. Unlike traditional LNG plants, unconventional natural gas liquefaction processes require special considerations in design and manufacturing. This review summarizes and analyzes the characteristics and differences of several typical unconventional natural gas liquefaction processes compared to traditional natural gas liquefaction processes, including coalbed methane liquefaction, synthetic natural gas liquefaction, LNG-FPSO, and PLNG (pressurized liquefied natural gas). Moreover, a state-of-the-art review of the recent progress on design and optimization of unconventional natural gas liquefaction processes is presented.

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“…A simulation of the propane precooled mixed refrigerant (C3-MR) liquefaction plant planned to be built with three pressure levels of propane cooling indicated that the specific horse power for the C3-MR process depends on natural gas supply temperature and pressure . The MR composition abiding with the variation in ambient conditions has been determined for the small and midscale LNG plants, , and methods for the selection of the refrigerant composition were proposed. − About 77% of base-load natural gas liquefaction plants employ a propane precooled mixed refrigerant cycle (APCI) where the propane cycle and the multicomponent refrigerant (MCR) cycle are involved in the cooling and liquefaction of natural gas . Thus, the majority of the liquefaction plants use the APCI liquefaction technology mainly because of its advantages of which are the flexibility, ease of refrigerant make up, and better specific power compared to other technologies operating at the same conditions.…”

Section: Introductionmentioning

confidence: 99%

Investigation and Performance Improvement of the Propane Precooling Cycle in the Propane Precooled Mixed Refrigerant Cycle Liquefaction Process

Fahmy

Nabih

El-Aziz

2016

Ind. Eng. Chem. Res.

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This study aims to improve the performance of the propane precooling cycle used for precooling of both natural gas and mixed refrigerant in the Propane Precooled Mixed Refrigerant Cycle (PPMRC) in an LNG plant. The unit is simulated by Aspen HYSYS version 7.3 for optimization of the propane precooling cycle to provide the minimum energy consumption of the propane compressors and the two air-coolers. The effect of subcooling temperature in the propane air-cooler, the number of compression stages in the propane cycle, and the quality of the natural gas feed are investigated. Results reveal the extent of reduction in power consumption on decreasing the subcooling temperature of liquid propane. The optimal subcooling temperature of liquid propane and number of compression stages in the propane cycle is determined. The positive impact attained in the performance of the propane cycle is higher for lean feed gas than for rich feed gas. The decrease of liquid propane subcooling temperature has a dominating influence on all performance criteria and, hence, can be considered as the key contributor affecting the propane precooling cycle in the PPMRC liquefaction process.

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Automatically varying the composition of a mixed refrigerant solution for single mixed refrigerant LNG (liquefied natural gas) process at changing working conditions

Cited by 35 publications

References 18 publications

Structural Modifications on Single Mixed Refrigerant Cycles for Performance Improvements in Small-Scale LNG Processes

Structural Modifications on Single Mixed Refrigerant Cycles for Performance Improvements in Small-Scale LNG Processes

Review of Unconventional Natural Gas Liquefaction Processes

Investigation and Performance Improvement of the Propane Precooling Cycle in the Propane Precooled Mixed Refrigerant Cycle Liquefaction Process

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