Drying apparatus of porous material, hydrogen production system including the same, and method for drying porous material

A system for producing hydrogen using a hydrogen production system comprising:

• a drying apparatus of porous material, the drying apparatus including a reduced-pressure fermentation dryer configured to:
• store lignite as porous material containing water in an airtight container;
• heat and stir the lignite under reduced pressure so that a temperature of the lignite is within a predetermined temperature range;
• feed microorganisms into the airtight container so that the microorganisms enter pores of the lignite;
• and
• evaporate the water contained in the lignite by fermentation heat by the microorganisms so as to dry the lignite;
• and
• a gasifier that gasifies the lignite dried by the reduced-pressure fermentation dryer of the drying apparatus so as to generate gas containing carbon monoxide and hydrogen as main components,
• wherein, in a reduced-pressure fermentation drying process by the reduced-pressure fermentation dryer,
• a fermentation by the microorganisms passing through the pores of the lignite under the reduced pressure and drying of the lignite to its central part by the fermentation heat by the microorganisms are performed until the fermentation by the microorganisms is stopped due to a dried state of the lignite, and
• the lignite that is dried and brittle is pulverized by being stirred under the reduced pressure maintained in the airtight container until the lignite becomes a state of fine pulverized coal having a particle diameter of not more than 0.1 mm, and
• wherein the fine pulverized coal obtained by the reduced-pressure fermentation dryer is subsequently supplied to the gasifier so as to generate gas containing carbon monoxide and hydrogen as main components.