Performance design of a cryogenic air separation unit for variable working conditions using the lumped parameter model

Xu, Jinghua; Wang, Tiantian; Chen, Qian-Yong; Zhang, Shuyou; Tan, Jianrong

doi:10.1007/s11465-019-0558-6

Cited by 9 publications

(3 citation statements)

References 45 publications

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“…[1][2][3][4][5][6][7][8][9][10] There are state-of-the-art technologies to separate oxygen from the air: cryogenic distillation, adsorption, and membrane separation. [11][12][13][14][15][16][17][18][19] Cryogenic distillation is commonly used for large-scale oxygen production (99% oxygen purity). However, this technology is costly and energy intensive.…”

Section: Introductionmentioning

confidence: 99%

Oxygen separation diffusion-bubbling membranes

Белоусов

2023

Phys. Chem. Chem. Phys.

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Section: Introductionmentioning

confidence: 99%

Oxygen separation diffusion-bubbling membranes

Белоусов

2023

Phys. Chem. Chem. Phys.

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“…At earlier stages, efforts mainly focused on the reduction in pressure drops through the optimization of the purification system and distillation columns, and successfully reduced the specific energy consumption of liquid oxygen from 0.7 kWh/kg to around 0.4 kWh/kg [3,4]. Further effort has been made to improve the efficiency of compressors, as 70-80% of the overall power consumption of the CASU comes from the power requirement of feed air compressors [5]. Researchers found that a 19% reduction in specific power consumption could be achieved if the compressor isentropic efficiency increased from 0.74 to 0.9 [6].…”

Section: Introductionmentioning

confidence: 99%

Potential for Energy Utilization of Air Compression Section Using an Open Absorption Refrigeration System

Sun²,

Wang³

2022

Applied Sciences

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In this paper, an open absorption refrigeration system is proposed to recover part of the waste compression heat while producing cooling capacity to further cool the compressed air itself. The self-utilization of the compression waste heat can significantly reduce the energy consumption of air compression, and hence increase the energy efficiency of the cryogenic air separation unit. To illuminate the energy distribution and energy conversion principle of the open absorption refrigerator-assisted air compression section, a thermodynamic model is built and the simulation work conducted based on a practical triple-stage air compression section of a middle-scale cryogenic air separation unit. Our results indicate that the energy saving ratio is mainly constrained by the distribution of the cooling load of compressed air, which corresponds to the heat load of the generator and cooling capacity of the evaporator in the open absorption refrigerator. The energy saving ratio ranges from 0.52–8.05%, corresponding to the temperature range of 5–30 °C and humidity range of 0.002–0.010 kg/kg. It is also estimated, based on the economic analysis, that the payback period of the open absorption refrigeration system is less than one year, and the net project revenue during its life cycle reaches USD 5.7 M, thus showing an attractive economic potential.

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“…Oxygen separation from air has numerous applications (oxy-combustion systems, metallurgy, life support systems, etc. ). − There are four basic processes to separate oxygen from air: cryogenic distillation, − pressure swing adsorption, − and polymer − and ceramic , membranes. Of these technologies, cryogenic distillation is widely used for large-scale oxygen production (98–99% oxygen purity).…”

Section: Introductionmentioning

confidence: 99%

Oxygen-Selective Diffusion-Bubbling Membranes with Core–Shell Structure: Bubble Dynamics and Unsteady Effects

Белоусов

Fedorov

2021

Langmuir

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Oxygen is the second-largest-volume industrial gas that is mainly produced using cryogenic air separation. However, the state-of-the-art cryogenic technology thermodynamic efficiency has approached a theoretical limit as near as is practicable. Therefore, there is stimulus to develop an alternative technology for efficient oxygen separation from air. Mixed ionic electronicconducting (MIEC) ceramic membrane-based oxygen separation technology could become this alternative, but commercialization aspects, including cost, have revealed inadequacies in ceramic membrane materials. Currently, diffusion-bubbling molten oxide membrane-based oxygen separation technology is being developed. It is a potentially disruptive technology that would propose an improvement in oxygen purity and a reduction in capital costs. Bubbles play an important role in ensuring the oxygen mass transfer in diffusion-bubbling membranes. However, there is not sufficient understanding of the bubble dynamics. This understanding is important to be able to control transport properties of these membranes and assess their potential for technological application. The aim of this feature article is to highlight the progress made in developing this understanding and specify the directions for future research.

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Performance design of a cryogenic air separation unit for variable working conditions using the lumped parameter model

Cited by 9 publications

References 45 publications

Oxygen separation diffusion-bubbling membranes

Oxygen separation diffusion-bubbling membranes

Potential for Energy Utilization of Air Compression Section Using an Open Absorption Refrigeration System

Oxygen-Selective Diffusion-Bubbling Membranes with Core–Shell Structure: Bubble Dynamics and Unsteady Effects

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