A method to obtain a compact representation of process performances from a numerical simulator: example of pressure swing adsorption for pure hydrogen production

Adsorption dynamics of a layered bed PSA for H2recovery from coke oven gas

“…It is usually recommended that the CO ..____. N --~ -; C o , --CO, wavefront not enter the zeolite layer because of the difficult desorption in the zeolite layer of CO, (Yang, 1987;Chlendi and Tondeur, 1995). The profile of H, shows a twostaged pattern by its own unique behavior in each layer.…”

“…The well-known roll-up phenomenon results from the Adsorption bed wd\ initidlly LatUrdted with H 2 at 299 15 K and 10 dtm fact that weakly adsorbed components lose their adsorption sites due t o the competitive adsorption of more strongly adsorbed components that follow the preceding wavefronts of weakly adsorbed components. The desorbed adsorbates join the bulk stream and increase the concentration more than feed concentration (Huang and Fair, 1988;Chlendi et al, 1995).…”

“…In addition, if some impurities are not removed in advance to prevent penetration into the main adsorption section, they will have a detrimental effect on the performance of the adCorre\pondenLe con-erning this article should be addressed to C -H Lee sorption process in practice (Yang, 1987;Chlendi and Tondeur, 1995). Some impurities such as H,O, CO,, SO,, and H,S must be removed before being fed into the adsorption bed packed with zeolite, because they are not desorbed by decreasing pressure alone.…”

“…Recently, Chlendi and Tondeur (1995) have studied the adsorption and desorption dynamics of a layered bed by using characteristics derived from an equilibrium theory. Based on this preliminary study, Chlendi et al (1995) investigated a six-step PSA process for pure H, production from cracking natural gas by numerical simulation, incorporating a mass balance, a linear driving force model (LDF), and a loading ratio correlation (LRC) without any energy balance. They studied the effects of several operating or design variables on the performances of the PSA cycle and represented the results as functions of those variables through sensitivity analysis.…”

Adsorption dynamics and effects of carbon to zeolite ratio of layered beds for multicomponent gas adsorption

“…Therefore, an important characteristic of the H 2 PSA process is that many different adsorbents are used in multiple layered beds. In previous works, a layered bed was applied to a PSA process for improvement in efficiency and showed that the yield and productivity of the PSA process using double-layered beds was strongly dependent on the relative layer lengths [6][7][8]. Also, the adsorption dynamics in the bed and its optimal design were studied from the experiment and simulation at high pressure, above 15 atm, in the layered bed for H 2 mixture separation [9,10].…”