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rich gas leaves the column from the other end via valve 1 and enters the light product tank. The pressure of the bed remains constant during the F step and is equal to the highest operating pressure in the cycle denoted by PH. A small portion of the light product was sent to bed-3 at low pressure PL from the light product tank by setting the appropriate flow in flow controller F31 via valve 15 during the light reflux step. All of the light reflux gas coming out of bed-3 via valve 17 was sent to bed-2 via valve 10 to perform heavy reflux step. Flow meter F13 was used to record the flow of the heavy reflux gas. After the feed step, bed-1 undergoes heavy reflux step, the gas as enters bed-1 at the high pressure PH during this step via valve 4 and exit the bed via 1. When bed-1 undergoes heavy reflux step, bed-2 undergoes light reflux step. The light reflux gas enters bed-2 via valve 9. After undergoing the HR step bed-1 then equalizes with bed-2. Valve 2 of bed-1 and valve 8 of bed-2 were opened the pressures of these two bed were allowed to equalize and pressure of both bed becomes PE. After the pressure equalization, step bed-1 was emptied counter currently by exposing it to the vacuum pump to low pressure PL while keeping the other end closed. The pressure of the bed-2 While bed-1 and bed-2 undergoing pressure equalization step, the pressure of bed-3 was brought back to the feed temperature PH by light product pressurization step by feeding the light product via valve 47. All three beds in the process undergoes the above mentioned seven steps in a cyclic manner. Table 3.2 PSA cycle schedule FEED HR E CnD LR E* LPP HR E LR E* FEED CnD LPP LR E* LPP FEED HR E CnD 120 20 100 120 20 100 120 20 100 16PDF Image | Development of a Pressure Swing Adsorption (PSA) Cycle for CO2 Capture
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