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6 Purging (regeneration) Final desorption and regeneration is performed at the lowest pressure of the PSA sequence. Highly pure hydrogen obtained from an adsorber in the provide purge step, is used to purge the desorbed impurities into the tail gas system. The residual loading on the adsorbent material is reduced to a minimum to achieve high efficiency of the PSA cycle. Repressurization (steps R1/R0) Before restarting adsorption, the regenerated adsorber must be pressurized again. This is accomplished in the pressure equalization step by using pure hydrogen from adsorbers presently under depressurization. Since final adsorption pressure cannot be reached with pressure equalization steps, repressurization to adsorp- tion pressure is carried out with a split stream from the hydrogen product line. Having reached the required pressure level again, this regenerated adsorber takes over the task of adsorption from another vessel having just terminated its adsorption phase. Scope of work. The typical scope of supply of Linde‘s PSA units includes: – Prefabricated valve skid – Adsorber vessels – Specially selected adsorbent material – Tail gas drum – Process control system The scope can be altered to best suit client‘s needs. Based on the customer‘s requirements, feed gas compressor or tail gas compressor systems can be offered through Linde as a integrated PSA solution. PSA valve skid Pressure time diagram Adsorber A Adsorption Adsorber B R0 R1 Adsorber C D E1 R0 R1 D E1 Adsorber D E1 Regeneration R1 PP D Regeneration R1 PP Adsorption E1 R0 Regeneration PP Adsorption D Regeneration PP Adsorption R0 Time PressurePDF Image | Hydrogen Recovery by PSA
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