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Pressure Swing Adsorption (PSA) for Hydrogen Production
Pressure Swing Adsorption (PSA) is a technology used to separate specific gas species from a mixture of gases under pressure. It's widely employed in the production of high-purity hydrogen gas.
How PSA Works for Hydrogen Production
Adsorption:
A gas mixture, often a hydrogen-rich stream from processes like steam methane reforming or water electrolysis, is passed through a bed of adsorbent material (typically a zeolite or carbon molecular sieve).
Under high pressure, the adsorbent selectively adsorbs impurities like carbon dioxide, methane, and water vapor, allowing the hydrogen to pass through.
Desorption:
Once the adsorbent becomes saturated with impurities, the pressure is reduced, causing the adsorbent to release the adsorbed gases.
This process is known as desorption.
Cycle Repetition:
Multiple adsorbent beds are used in a cyclical process to ensure continuous hydrogen production.
While one bed is adsorbing impurities, another is being regenerated.
Advantages of PSA for Hydrogen Production
High Purity: PSA can produce high-purity hydrogen, often exceeding 99.999% purity.
Energy Efficiency: The process is relatively energy-efficient, especially when compared to other separation techniques.
Flexibility: PSA systems can be designed to handle various feed gas compositions and flow rates.
Compact Design: PSA units are compact and require minimal space.
Low Operating Costs: The process has low operating costs, making it economically attractive.
Gas sources:
Methanol cracking gas, ammonia cracking gas, methanol tail gas, formaldehyde tail gas,
Synthesis gas, refinery gas, hydrocarbon steam reforming gas, fermentation gas, polysilicon tail gas,
Semi-water gas, town gas, coke oven gas
Refinery catalytic cracking dry gas, refinery reforming tail gas
Other H₂-containing gas sources
Technical parameters:
Operating Pressure: 0.4~4.0MPa (gauge pressure)
Operating Temperature: Ambient temperature
Product Output: H₂
H₂ Purity: 98~99.999% (V), adjustable based on customer requirements
H₂ Recovery: 80~98%
System Pressure Drop: 0.05~0.1MPa
Output Temperature: Ambient temperature
Note: H₂ recovery is related to feed gas composition, pressure, and product H₂ purity.
Pressure Swing Adsorption (PSA)
Pressure Swing Adsorption (PSA) is a technology used to separate specific gas species from a mixture of gases under pressure. It's widely employed in the production of high-purity hydrogen gas.
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Pressure Swing Adsorption (PSA)
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