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PG&E GAS R&D AND INNOVATION TECHNICAL ANALYSIS: PRESSURE SWING ADSORPTION There is a variant to PSA called rapid cycle PSA which will operate at a speed of 5-20 times conventional PSA. Rapid cycle PSA is carried out by using multi-port selector rotary valves and a many smaller adsorption chambers. These systems are typically smaller in size, have lower capital costs, lower pressure drops, and higher throughputs. The downside of rapid cycle PSA is the methane recovery rate. One of the largest suppliers of rapid cycle PSA systems is Xebec Inc. which can maintain a capacity of 150 to 5,000 Nm3/hr of biogas. (Xebec Adsorption, 2017) Four Steps (Skarstrom Cycle): (Bauer, 2012) • Pressurization: The raw biogas is pressurized in the vessel to 4-10 bar. • Feed/Adsorption: The raw biogas is fed into the tank and the targeted compounds start to become attracted to the solid adsorption surface as the methane flows through the column. When the adsorption bed is saturated, the feed is closed and the blowdown phase is initiated. • Blowdown: Once the adsorption bed is saturated, and the upgraded methane was moved through, the feed is close. The pressure inside the vessel is lowered considerable to desorb the carbon dioxide from adsorbent and the carbon dioxide rich gas is pumped out of the vessel. • Purge: At the lowest column pressure, the purge is initiated. “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 5 OF 12PDF Image | Pressure Swing Adsorption Technical Analysis
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