SWCHEM’s PSA-H₂ technology separates and purifies H₂ from H₂-containing gas streams by taking advantage of the different adsorption capacities of adsorbents for various gas components under different pressures.
Under elevated pressure, impurities in the feed gas are selectively adsorbed by the adsorbent, while weakly adsorbed components such as H₂ pass through the adsorber as product gas. When the pressure is reduced, the adsorbed impurities are desorbed and the adsorbent is regenerated.
The process is operated in cycles with multiple adsorbers working alternately, enabling continuous production of H₂.
The PSA-H₂ process is based on selective adsorption and pressure swing regeneration.
At higher pressure, impurities such as CO, CO₂, CH₄, N₂ and other components are adsorbed on the adsorbent bed. H₂, as a weakly adsorbed component, passes through the adsorber and is collected as product gas.
During regeneration, the adsorber pressure is reduced, allowing the adsorbed impurities to be released. The regenerated adsorber is then repressurized and returned to the adsorption step.
Typically, at least four adsorbers are required for alternating operation to ensure continuous product gas output.
Applicable feed gases include:
| Item | Data |
|---|---|
| Pressure | 0.4–7.0 MPa(g) |
| Temperature | Ambient temperature |
| Item | Data |
|---|---|
| Product | H₂ |
| H₂ purity | 98.5–99.999 vol%, adjustable according to customer requirements |
| H₂ recovery | 80–99% |
| System pressure drop, ΔP | 0.05–0.1 MPa |
| Temperature | Ambient temperature |
Note: H₂ recovery depends on feed gas composition, feed pressure, required product H₂ purity and trace impurity requirements.
PSA units are controlled by dedicated controllers and instruments. Depending on the PSA unit capacity, automation level and customer control requirements, a DCS control system consistent with the customer’s main plant may be used, or a standalone PLC control system may be selected.
In addition to conventional PSA sequence control, loop control and other control functions, SWCHEM also provides specialized control strategies for fully automatic load adjustment, fault diagnosis and fault isolation.
The system can support adaptive optimization, self-diagnosis and fault isolation, improving operational flexibility and helping ensure long-term, stable and safe operation of the unit.
SWCHEM provides:
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