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As the composition between point A and the right end of the bed is constant (y = 0), the gas at position A also has velocity ui and we can use Equation (3.27) to calculate the velocity of position A: dz dt A (3.28) The time it takes to purge the bed is then just the length of the bed, LB, divided by the velocity of position A, Equation (3.28) (Equation (34) in Knaebel and Hill, 1985). f - LB (3.29) PA^I Where: tpu = time required for the purge step {s} We can then calculate the volume of light purge gas at low pressure used to purge the bed. volume = velocity * area * time V PU -u2-s A-tPU Where: Vpu = volume of light gas used to purge the bed at P = PL{m3} When we substitute in Equation (3.29), the result is: V = PU £j_30j PA (3-31> 57PDF Image | Energy Efficiency of Gas Separation Pressure Swing Adsorption
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