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What is Pressure Swing Adsorption (PSA) A technology used to separate and purify components of a gas mixture under pressure according to each component’s molecular characteristics and affinity for a specific adsorbent material. Specific adsorptive materials preferentially adsorb a target gas at pressure. The pressure is then swung low to desorb the adsorbed material, leaving a purer gas. • Under high pressure, gases tend to be attracted to solid surfaces, a phenomenon known as adsorption. Gas components are separated because different gases are attracted to different solid surfaces at different intensities. • Since heating and cooling is not part of the process, the cycle time can be in the range of minutes. The adsorbent material has a very long lifetime compared to other upgrading technologies. • Flow rates range from small scale at 10 m3/hr to larger scale at 10,000 m3/hr. (Grande, 2011) • An attractive gas upgrading technology due to compactness of the equipment, low energy requirements, low capital costs, and simple operation (Augelletti, 2017). Figure 1 Graph showing the relationship between adsorbed CO2 and pressure (Bauer, 2012) A methane recovery greater than 99% can be obtained with an energy consumption of 1250 kJ per kg of biomethane. Mixing blowdown gas with raw biogas, methane recovery can be increased by up to 5%. (Petersson, 2009) PG&E GAS R&D AND INNOVATION TECHNICAL ANALYSIS: PRESSURE SWING ADSORPTION “PG&E” refers to Pacific Gas and Electric Company, a subsidiary of PG&E Corporation. © 2019 Pacific Gas and Electric Company. All rights reserved. PAGE 4 OF 12PDF Image | Pressure Swing Adsorption Technical Analysis
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