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Chapter 6. Design and Environmental Impact Analysis of a Hybrid PSA-Membrane Separation System variables are estimated. As an alternative to this, the optimization procedure followed here involves performing dynamic simulations on the hybrid system (see Table 6.3) to evaluate the effect of few important decision variables on the hybrid performance indicators. Furthermore, some of the important assumptions related to the PSA membrane integration are listed below: 1. From the off gases coming out of the blowdown and purge steps of PSA operation, only 2 SLPM of the total amount is employed as a feed to the membrane module. 2. It is further assumed that a suitable controller is in place for the off gas tank to maintain this rate at a constant value during the blowdown and purge steps of the PSA cycle. 3. This stream enters the membrane module at a temperature of 20 0C as DDR membrane operates better at low temperature and PSA off gas temperature is also near to this value. 4. The pressure of this stream entering the membrane has been assumed to be 1.5 bars which represents the average pressure of off gases during the blowdown and purge pressure. It is important to note that pressure at the bed outlet remains quite steady during the purge step of the PSA cycle however, during the blowdown step the pressure changes significantly from the higher depressurization pressure levels to atmospheric blowdown pres- sure. Consequently, the assumption of average pressure 1.5 bar during this operation seems quite reasonable. 5. The average composition of PSA off gas entering the membrane is calculated by assuming that off gas streams from four beds enters a well mixed tank at their actual (varying) pressure and temperature. 149PDF Image | Operation and Control of Pressure Swing Adsorption Systems
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