| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a method and an apparatus for producing hydrogen, by which an adsorbing agent in a hydrogen purification unit can be cleaned as desired without using product hydrogen in a cleaning process, and product hydrogen is efficiently produced. <P>SOLUTION: In the method for producing hydrogen for producing high purity product hydrogen from a hydrogen-enriched gas by repeating a hydrogen taking-out step for taking out the high purity product hydrogen by adsorbing impurities in the hydrogen-enriched gas onto the adsorbing agent while maintaining the inside of the hydrogen purification unit in a pressurized state, an off-gas taking-out step for taking out off-gas by desorbing the impurities from the adsorbing agent while maintaining the inside of the hydrogen purification unit in a reduced pressure state, and a cleaning step for cleaning the adsorbing agent by high purity cleaning hydrogen while maintaining the inside of the hydrogen purification unit in a reduced pressure state, after completion of the hydrogen taking-out step, a hydrogen recovering step for recovering the high purity hydrogen remaining in the hydrogen purification unit as the cleaning hydrogen is performed by the reduction of the pressure in the hydrogen purification unit, and after completion of the hydrogen recovering step, the off-gas taking-out step is performed. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
