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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.
申興秀,李炳哲 홍익대학교 산업기술연구소 1993 産業技術 Vol.2 No.-
Mathematical simulation was performed to study the separation of CH_4/CO_2 gas mixture by pressure swing adsorption (PSA) process. The PSA processes considered in this study was 3-step PSA process for CH_4 or CO_2 production only and 4-step PSA process for simultaneous production of CH_4 and CO_2 using 5A zeolite and PCB activated carbon. Performance of separation by 3-PSA for CH_4 or CO_2 production only and 4-step PSA for simultaneous production of CH_4 and CO_2 operated below atmospheric pressure using 5A zeolite is better than that using activated carbon. PSA process operated below atmospheric pressure using both adsorbents is more advantageous than that above atmospheric pressure. 4-step PSA for simultaneous production of CH_4 and CO_2 operated below atmospheric pressure using 5A zeolite resulted in a little less inferior performance of separation than that for CH_4 production only, but in a far better performance than that for CO_2 production only. However, such an improvement in performance of CO_2 separation by 4-step PSA cycle disappeared when using activated carbon instead of 5A zeolite. The typical results for a PSA cycle between 1.01bar and 0.267bar using 5A zeolite were : 97.8 ㏖% CH_4 purity at 58.4% CH_4 recovery for CH_4 production only, 98.1 ㏖% CO_2 purity at 32.0% CO_2 recovery for CO_2 production only, and 97.3 ㏖% CH_4 purity at 50.9% CH_4 recovery for CH_4 and 95.8 ㏖% CO_2 purity at 71.6% CO_2 recovery for simultaneous production of CH_4 and CO_2.
申興秀 홍익대학교 산업기술연구소 1996 産業技術 Vol.6 No.-
Mathematical simulation of a multibed pressure swing adsorption(PSA) process simulate a countercurrent flow for separation of a binary gas mixture is performed. The multibed PSA cycle is simplified to one-bed cycle in order to overcome difficulties simulation a multibed cycle. The mathematcal simulation involves the fomulation of material balances in gas and solid phases. The mass transfer within an adsorbent is described by linear driving force model. The resulting equations are solved numerically with pertinent boundary conditions for each step. Orthogonal collocation is applied for the formulated mathematical model and the resulting ordinary differential equations are integrated by Gear's method. The system considered in this study is nitrogen production from air by carbon molecular sieve. Complete clean-up during purging step is assumed. The simulation results indicate that increase in performance is greastest when the bed number increases from two to three however, it is negligible for more than four beds. The extent of performance improvement is larger for lower product plurity.
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.