HYDROGEN PRODUCTION SYSTEM, AND STARTING AND STOPPING METHOD THEREFOR

• Main Authors: FUJIKI HIROSHI, SATOKAWA SHIGEO, TAKAHASHI TORU, KOMIYA JUN, FUJIWARA NAOHIKO
• Format: Patent
• Language: English
• Published: 04.11.2004
• Edition: 7
• Subjects: BASIC ELECTRIC ELEMENTS; CHEMISTRY; COMPOUNDS THEREOF; ELECTRICITY; INORGANIC CHEMISTRY; METALLURGY; NON-METALLIC ELEMENTS; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

PROBLEM TO BE SOLVED: To provide a hydrogen production system which can continue running for a long time while repeating starting-stopping by preventing the degradation of a reforming catalyst and a CO modification catalyst by always keeping the inside of the system to be in a reducing atmosphere from the start of stopping to the stopped state and from the start of operation to the steady-state operation; an operation method for the same; and a fuel cell system. SOLUTION: In the hydrogen production system, a CO modification section and a CO removal section are connected in this order to a steam reformer having a burning section and a reforming section. At the outlet conduit of the CO modification section, a valve is arranged. When the system is stopped, the valve is closed and the supply of a raw material gas and water to the reforming section is stopped. When the reforming section and the CO modification section reach a specified temperature or lower, the valve is opened to supply the raw material gas to both the reforming section and the CO modification section to purge the reformed gas. COPYRIGHT: (C)2005,JPO&NCIPI