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申興秀 홍익대학교 산업기술연구소 1994 産業技術 Vol.4 No.-
Mathematical simulation of multi-bed pressure swing adsorption(MPSA) cycle with pressure equalization(PE) steps is performed. In order to overcome mathematical difficulties in simulating MPSA cycle with PE steps a simplified PSA cycly is proposed. The simplified cycle a cycle for one bed is obtained by modifying PE and cocurrent blowdown steps. The simplified one-bed cycles are simulated by applying equilibrium cell model with the assumption of linear uncoupled isotherms for both components and isothermal operation. Performances of the simplified cyces are compared in view of a light-component recovery and a productivity. The simulation results indicate that MPSA cycle with PE steps show a higher recovery than the Skarstrom's cycle with a product pressurization. As the number of bed increases the recovery generally becomes higher. However, in low-pressure operation the extent of an incrased in recovery is negligible for MPSA cycles with more than 5 beds and in high-pressure operation 4-bed cyle shows a lower recovery than 2-bed.
申興秀 홍익대학교 산업기술연구소 1997 産業技術 Vol.7 No.-
Process performance for a two-bed PSA process with partial pressure equalization(PE) is determined by a numerical simulation. An equilibrium cell model is used with the assumption of Langmuir, uncoupled isotherms for both components and isothermal operation. Effects of purge amount and extent of equalization on process performances is examined in view of productivity, light-component recovery, and power consumption. Also, performance contours are constructed from the simulation results, 95% oxygen production from an air with zeolite 13X is considered as a case study. For the case of feed-pressurization. optimum specific purge and extent of equalization for the maximum productivity is observed. At the optimum specific purge improvement of all performances parameters or a trade-off among performance parameters are shown depending on the range of the extent of equalization. The optimum operation condition for oxygen production from air is 0.1mol/cycle ㎏ of specific purge and 0.75 if extent of equalization. For the case of product-pressurization, the optimum specific purge is identical to that for the feed-pressurization. At the optimum specific purge a trade-off among performance parameters is shown for the entire range of extent of equalization.
압력스윙흡착공정에 의한 다성분계 가스분리 : 다탑공정의 수학적 모델 개발 Development of a Mathematical Model for Multi-bed Processes
申興秀 홍익대학교 산업기술연구소 1999 産業技術 Vol.9 No.-
Mathematical model is developed for separation of a multicomponent gas mixture by multi-bed pressure swing adsorption (PSA) process. Equilibrium cell model is used with the assumption of uncoupled Langmuir isotherms for components and isothermal operation. Multi-bed cycles considered in this study are 4 and 5-bed cycles shown in the patent. The developed model is applied to the separation of hydrogen from reformer off-gas by a PCB activated carbon. The effect of purging amount was examined in view of recovery and productivity and optimum amount is observed. Since the developed model simulates successfully multi-bed PSA processes, it can be used for selecting suitable adsorbent and comparing different PSA cycles quantitatively before experiments. Also, this model can be extended to a more elaborate one to simulate an actual process accurately by including effects that are omitted in this study.