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5.5.3 System Design Gas into the system can be supplied to either the feed side or product side of the system through a switch valve (SV2-5 or SV2-3 on Figure 5.6). Four types of gases are connected to a separate switch valve (not shown on figures) which controls the type of feed gas supplied to the system. The gas options are nitrogen, oxygen, helium, and dry air, which were all stored in compressed gas cylinders. A vacuum pump (Thomas WOB- L piston pump, model # 817CA22) was connected to the product end to allow for vacuum pressure in the columns during the purge/blowdown step. It was connected to a switch valve (SV1) that takes the pump offline if it was not used in the process. An industrial back pressure controller (BPC4) with pressure control above and below atmospheric pressure is located upstream of the pump and is responsible for controlling the purge/blowdown pressure. A product tank is connected on the product end of the system if product collection is needed for cycles involving product pressurization. Two hand valves (HV1 and HV2) control whether flow enters or bypasses the tank during the process. The pneumatic valves (PV1-16) that control the flow in and out of the adsorption columns are housed together in four valve blocks on both sides of each column. On the feed side of the system (Figure 5.6) during a PSA process, feed gas enters during the feed/production step through SV2-5. It then flows through the line labeled Feed 1 and Feed 2 to PV8 and PV16 which lead to the adsorption columns. During the blowdown and purge steps, flow travels from the columns through PV6 and PV14 into the lines labeled Blow1 and Blow2, which lead to the vacuum pump and exit D. PV7 and PV15 were not used for this study and hence the lines leading to them were not displayed 85PDF Image | LIMITS OF SMALL SCALE PRESSURE SWING ADSORPTION
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