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Hydrogen Purification Technology
Hydrogen purification technology uses special adsorbents to selectively adsorb impurity components such as nitrogen, carbon monoxide, carbon dioxide and methane at relatively high pressure, allowing hydrogen to pass through and produce high-purity product gas. The adsorbed impurities are then desorbed and discharged through gradual pressure reduction, purging and other steps, thereby regenerating the adsorbents.
■ Technical Features
· High and flexibly controllable product purity: Hydrogen purity can be stably purified to above 99.9%–99.999% as required, and the purity index can be adjusted through process optimization.· High hydrogen recovery rate: Through multi-tower process, pressure equalization design and tail gas recovery optimization, the hydrogen recovery rate from feed gas can be increased to above 75%–95%, with remarkable economic benefits.
· High degree of automation and stable operation: The whole process is automatically controlled by PLC/DCS system with automatic cyclic switching of adsorption towers, realizing unattended and continuous stable operation.
· Wide operating flexibility: Good adaptability to changes in feed gas pressure, flow rate and composition, with a wide load adjustment range (normally stable operation within 60%–110%).
· Low energy consumption and pollution-free: The main driving force is pressure change without additional heating, so energy consumption is much lower than that of cryogenic separation. The process involves physical adsorption/desorption without secondary pollution.
· Easy start-stop and simple maintenance: The unit starts up quickly and can reach design indicators within several hours normally. The adsorbent has a long service life (generally 5–10 years) with low daily maintenance workload.
· Modular design with high integration: The unit can be designed and installed in modules, with a relatively small footprint, convenient for capacity expansion and relocation.
■ Process Flow Diagram
