| Summary: | 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.
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