Research Progress of Pressure Swing Adsorption CO₂ Capture Technology and Case Analysis of Its Application in Petrochemical Industry

  Introduction  As an important carbon capture method in CCUS, pressure swing adsorption (PSA) CO₂ capture technology has been widely used. However, the excessive capture energy consumption and operation cost restrict the promotion and implementation of the technology. How to accurately select the appropriate capture technology according to the actual situation and reduce the capture energy consumption is particularly important.

  Method  This paper discussed the basic research and technical application of PSA technology at home and abroad, and analyzed the economy and prospect of PSA technology in petrochemical industry based on a practical application case of PSA technology for CO₂ capture in a petrochemical enterprise.

  Result  In this case, the project using PSA CO₂ capture technology captured and stored about 800000 tons of medium-concentration carbon sources produced by the purification unit and low-temperature methanol washing unit of the coal-to-hydrogen plant. For 73.9% concentration of CO₂ raw gas, the device achieved 96% CO₂ recovery rate and 98% capture purity. H₂S, CH₄ and CH₃OH are all controlled below 0.015%, which can achieve about 56 kWh/t CO₂ capture power consumption. It is found that pressure swing adsorption technology has the advantages of low energy consumption, low piezoresistivity, continuous process and strong stability of adsorbent, which shows the technical and economic feasibility. Since pressure swing adsorption is mainly physical adsorption, PSA may face the problem of high energy consumption and insufficient enrichment concentration for the treatment of low concentration of CO₂ feed gas.

  Conclusion  In summary, PSA CO₂ capture technology is suitable for the treatment of medium concentration carbon sources, and has potential in thetreatment of exhaust emissions in petrochemical, cement and other industries in the future.