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<p>The pressure swing adsorption (PSA) process has a wide range of applications for CO<sub>2</sub> capture from flue gas, due to the advantages of simple operation, low investment and energy consumption. However, existing research results have shown that conventional single-stage PSA typically cannot achieve 95% purity CO₂ with 90% recovery using most commercial adsorbents. Dual reflux pressure swing adsorption (DR-PSA) is a special process that combines stripping and enriching PSA, where light and heavy products with high purity and high recovery can be obtained simultaneously. However, its industrial applications are limited by the problems of discontinuous feeding and high energy consumption. To overcome these limitations, a 4-bed continuous DR-PSA was developed and simulated using a model validated against published experimental data, with simulated flue gas (CO<sub>2</sub>/N<sub>2</sub> = 15%/85%) as the feed and silica gel as the adsorbent. After comparing internal state variables, four key parameters, including feed flow rate, step duration, light reflux-to-feed ratio, and feed position, were studied in detail. The results indicate that the proposed process can achieve CO<sub>2</sub> purity of 96.42% with 96.52% recovery, N<sub>2</sub> purity of 99.40% with 99.40% recovery, a productivity of 0.4607&#xa0;mol CO<sub>2</sub>/kg/h, and a specific energy consumption of 1.172 GJ/t CO<sub>2</sub>. The process demonstrates significantly superior specific energy consumption compared to prior studies.</p>

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Simulation and analysis of 4-bed continuous dual reflux pressure swing adsorption process for CO2 capture from flue gas

  • 期刊论文

  • 发表日期：

    2025年11月27日

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  • Zhaoyang Niu,
  • Jiayi Yao,
  • Donghui Zhang,
  • Wenbin Li,
  • Zhongli Tang

摘要

The pressure swing adsorption (PSA) process has a wide range of applications for CO2 capture from flue gas, due to the advantages of simple operation, low investment and energy consumption. However, existing research results have shown that conventional single-stage PSA typically cannot achieve 95% purity CO₂ with 90% recovery using most commercial adsorbents. Dual reflux pressure swing adsorption (DR-PSA) is a special process that combines stripping and enriching PSA, where light and heavy products with high purity and high recovery can be obtained simultaneously. However, its industrial applications are limited by the problems of discontinuous feeding and high energy consumption. To overcome these limitations, a 4-bed continuous DR-PSA was developed and simulated using a model validated against published experimental data, with simulated flue gas (CO2/N2 = 15%/85%) as the feed and silica gel as the adsorbent. After comparing internal state variables, four key parameters, including feed flow rate, step duration, light reflux-to-feed ratio, and feed position, were studied in detail. The results indicate that the proposed process can achieve CO2 purity of 96.42% with 96.52% recovery, N2 purity of 99.40% with 99.40% recovery, a productivity of 0.4607 mol CO2/kg/h, and a specific energy consumption of 1.172 GJ/t CO2. The process demonstrates significantly superior specific energy consumption compared to prior studies.