PURPOSE: To enable combustion gas providing a stable combustion and even in case of different type of fuel and having less difference in temperature distribution to be generated by a method wherein natural gas flows in a central port, anode discharged gas flows in a port around it and air flows in the outer- most circumference for a structure having triple ports.
CONSTITUTION: Air 22 flows into an air manihold 12 and is injected from an air inlet 15 into furnace and at the same time natural gas 23 flows into a natural gas manihold 14, the gas is injected from a natural gas port 17 into the furnace so as to perform a combustion therein. Heated item is heated and its temperature is increased. Quality of water vapor is improved and generated hydrogen is supplied to an anode of a cell anode discharged gas 24 including unreacted hydrogen is discharged from the anode and a flow rate of natural gas 23 is throttled in place of supply of the anode discharge gas to the burner 1, and then a combustion at the burner 1 is transferred from a combustion of natural gas 23 to a combustion of the anode discharged gas 24. The anode discharged gas 24 is injected from an anode discharged gas port 16 into the furnace. Simultaneously, a flow rate if air 22 is also controlled and an adjustment is carried out so as to prevent a flame length from being too elongated.
UCHIDA HIROSHI
KOYAMA KAZUHITO
SUGITA NARIHISA
UCHIYAMA YOSHIHIRO
HANZAWA AKIO
HITACHI LTD