System and method for pressure swing adsorption

A system for pressure swing adsorption, the system comprising:

• a plurality of beds each configured to perform at least one of an adsorbing process, a pressure equalizing process, a vacuum process, or a pressurizing process;
• a supply valve provided in each bed of the plurality of beds and connected to a mixed gas supply unit configured to supply a mixed gas to each bed of the plurality of beds;
• a discharge valve provided in each bed of the plurality of beds and connected to a hydrogen gas discharge unit configured to discharge hydrogen generated in each bed of the plurality of beds;
• a vacuum valve provided in each bed of the plurality of beds and connected to a vacuum pump so as to be open to the vacuum pump during the vacuum process of a bed among the plurality of beds;
• a control unit configured to control the supply valve, the discharge valve, and the vacuum valve provided in each bed of the plurality of beds to allow each bed to perform the adsorbing process, the pressure equalizing process, the vacuum process, or the pressurizing process;
• a depressurization valve provided in each bed of the plurality of beds;
• and
• a recovery valve provided in each bed of the plurality of beds,
• wherein:
• each depressurization valve is connected to an off-gas tank,
• the plurality of beds includes a pressure equalization bed configured to perform the pressure equalizing process, and
• the control unit is configured to open the depressurization valve of the pressure equalization bed, in which the pressure equalization process has been performed, to discharge the mixed gas to the off-gas tank, and
• wherein:
• each recovery valve is connected to each bed of the plurality of beds by a recovery line to which a pressure swing adsorption (PSA) recovery valve is connected,
• the plurality of beds includes a pressurization bed configured to perform the pressurizing process,
• the control unit is configured to open the recovery valve of the pressurization bed to supply the hydrogen from the hydrogen gas discharge unit to the pressurization bed, and
• a plurality of pressure equalization valves is provided to be connected to each bed of the plurality of beds to form a plurality of pressure equalization lines that correspond to a number of pressure equalization valves of the plurality of pressure equalization valves.