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3.2.3 Blowdown Step During the blowdown step, the first of the two regeneration steps, the pressure in the bed is reduced from PH to PL by exhausting gas from the bed. The object of this step is to partially rid the bed of some of the heavy component and ready the bed for the low pressure purge step. During the purge step the rest of the heavy gas is removed from the bed. At the begirvning of the blowdown step the pressure is PH and the mole fraction is yo, which is uniform throughout the bed. This can be seen in Figure 3.5 (a). As the pressure decreases, the mole fraction of the gas in the bed increases. This happens because a given decrease in pressure results in the desorption of more heavy component than light component. The condition of the adsorbent bed at the end of the blowdown step can be seen in Figure 3.5 (b). Figure3.5 MoleFractionintheBedatthe(a)Beginningand(b)Endingofthe Blowdown Step. For the Four-Step cycle, work is only required for that portion of the blowdown step during which the pressure in the bed is less than atmospheric. If the pressure in the bed is greater than atmospheric, the gas is allowed to escape to the atmosphere as the pressure decreases. Figure 3.6 shows the example where PH > Po > PL. For the first step 51PDF Image | Energy Efficiency of Gas Separation Pressure Swing Adsorption
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