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The last design parameter is cycle time, which was controlled by the individual step times set by the PLC. These step times may be changed, however, it was required that the combined time of the purge and blowdown steps equal the combined time of the feed pressurization and production steps. 5.5.6 Performance Parameters Process performance is primarily evaluated through two different performance parameters. Recovery is the amount of desired component fed into the system that is available as product. In essence, it is related to the energy efficiency of a process. For air separation, it can be calculated based on the product stream or the waste stream. If it is based on the product stream, it is calculated from equation 5.15 using the amount of gas per cycle of the product and feed streams. For a cycle at CSS, recovery is inversely related to purity. An increase in product purity decreases recovery since a higher purity requires more purge gas, which leaves less gas available as product. Recovery is dependent on separation efficiency just like purity. Hence, it is possible to increase recovery with a more selective zeolite or inclusion of an additional step like pressure equalization that increases the regeneration efficiency. The other performance parameter is BSF which is a measure of adsorbent utilization and process productivity, often expressed as: 91PDF Image | LIMITS OF SMALL SCALE PRESSURE SWING ADSORPTION
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