Simulation of recovery and purity SO2,NO2 and CO2 by using pressure swing adsorption

• Main Authors: Chuan-Tse Lee, 李權哲
• Other Authors: Cheng-tung Chou
• Format: Others
• Language: zh-TW
• Published: 2004
• Online Access: http://ndltd.ncl.edu.tw/handle/97259035789371017085

碩士 === 國立中央大學 === 化學工程與材料工程研究所 === 92 === The major cause for acid-rain phenomena is the emission of SO2 from power plants that burn fossil flues, and the major cause for greenhouse effect is the emission of CO2 from power plants. It is important to recover and concentrate SO2, NO2 and CO2 from flue gas in solving those problems. Pressure swing adsorption is a feasible process in treating such problems. This study uses a two-stage vacuum swing adsorption process, with each stage composed of a three-bed six-step operation. Simulation is performed for the bulk separation of SO2/NO2/CO2/N2 (0.5/0.13/18/81.37 vol %) system. The first stage of SO2-VSA (vacuum swing adsorption) utilizes Dowex MWA-1 as adsorbent, and the second stage of CO2-VSA utilizes 13X zeolite as adsorbent. This study uses the equilibrium model and the pressure drop can be neglected. We assumed instantaneous equilibrium between the solid and gas phase with non-isothermal operation. The 0.5%SO2 in the feed can be concentrated to 6.31% in the product with a recovery of 90%, the 0.13%NO2 in the feed can be concentrated to 0.96% in the product with a recovery of 52%, and the 18%CO2 in the feed can be concentrated to 73% in the product with a recovery of 86%. The effects of operating variables such as P/F ratio, adsorption pressure, desorption pressure, and steps time are investigated on the performance of this study.