PURPOSE: To make a furnace small size and light weight by providing a heating space wherein the combustion gas of down flame type burners provided to the ceiling surface of the heating furnace moves downward, and ≥2 rows of tube groups comprising many tubes of vertically heated tubes in the heating space.
CONSTITUTION: For example, combustion gas at high temp. such as 1,100W1,200°C flows between many numbers of vertically heated tube groups 17 arranged to ≥2 rows each aligned to a straight line, and transmits heat by mainly radiation to the heated tubes 17 from down flame burners 16 arranged to the surface of the ceiling 13 of a heating furnace 11. On one hand, feed gas for reforming which has been preheated and fed from a feed pipe 21 provided with fins connected to said heated tubes 17 is reformed to the gas having a composition suited to the final target product (e.g. NH3) while rising upward through the heated tube 17b, by the effect of heat transmitted during rising and the catalytic effect of a catalyst packed in the heated tube 17.
SHOJI KAZUO
NAITO AKIO
KOBAYASHI YUKIHIRO
WATANABE HIROSHI
