PURPOSE: To provide the titled operation where the amount of carbon in an iron bath is recognized continually and the amounts of carbonaceous material and oxygen to be blown are regulated respectively so that the operating conditions can always be maintained in the optimum range, thus efficiently producing high-purity reducing gas.
CONSTITUTION: (1) A carbonaceous material 3 containing a large quantity of carbon such as heavy oil or coal, (2) oxygen 4, (3) some amount of iron ore 5 and (4) a slag-forming agent are continuously blown into an iron bath 2, and, during the operation, the respective amounts of the carbon and oxygen in said raw materials and the respective amounts of the carbon and oxygen in the product are continuously determined through instrumentation. Thence, based on the resulting values and specified calculation models for carbon and oxygen balances and heat balance, the amount of carbon in the iron bath 2 is continuously determined through an operating device 13, and the amount(s) of the carbonaceous material and/or oxygen to be blown is (are) regulated so that the amount of carbon in said iron bath fall within a specified range, thus efficiently producing high-purity reducing gas while stably maintaining the optimum operating conditions.
ENDO KOHEI
SATO TAKERO
