Study on Optimization of a Thermal Swing Adsorption System in Fixed Beds for Air Purification and Solvent Recovery

• Main Authors: You,Geeng Shyan, 尤耿賢
• Other Authors: Li,Shih Ming
• Format: Others
• Language: zh-TW
• Published: 1994
• Online Access: http://ndltd.ncl.edu.tw/handle/33541198125774218925

碩士 === 逢甲大學 === 化學工程研究所 === 82 === To emphasize the importance of the functions of thermal swing adsorption system in fixed beds on both air purification and solvent recovery, the system cyclic behavior includes not only the purification efficiency of the process air but also the enhancement ratio of the regeneration gas. For a specified adsorbate-adsorbent pair at a specified inlet temperature and concentration, the dimensionless parameters of the model affecting the system cyclic behavior include the dimensionless heat and mass transfer parameters and the dimensionless operating parameters, which are mainly functions of the transport properties and the operating conditions. In the study, the theoretical analysis was performed for a single component system to establish the relationship between the cyclic behavior and the dimensionless parameters, i.e. the so called dimensionless cyclic behavior chart in which the ordinate represents the cyclic behavior and the abscissa represents the operating cost. Each curve on the chart was formed at a specified purification efficiency and the lowest point of the curve can be taken as the optimal operating point of the system at this purification efficiency. Also, this optimal operating point was used as a criterion to select the optimal design and operating parameters in several case studies. Taking the acetone-activated carbon system as an example, the simulation results showed that the addition of a cooling step into the system can only improv1;the enhancement ratio of the regeneration gas a little and the enhancement ratio is about∼ 2.5 for the base point of the simulation , where the purification efficiency of the process air is set at 95%. The enhancement ratio of the system can be futher increased by decreasing the inlet concentration of the process air, increasing the inlet temperature of the regeneration gas, decreasing the purification efficiency of the process air, improving the mass transfer rates within the particles, and increasing the bed length.