Abstract
Though many calculating methods on steady state models of blast furnace were reported, a particular method always was applied in there. In order to explain the reason mentioned above, Iwao proposed “Basic Model of Simplified Blast Furnace” and applied two Goodness Criteria (rmsN, rmsD) to that. Furthermore, in order to analytically derive two Goodness Criteria, he showed that reaction products and reaction rate should be linearized by process data (reaction raw materials and reaction product analysis data).
This paper proposed an approximate model of real blast furnace. This model was made up by reconsidering reaction raw materials and chemical reaction in the “Simplified Blast Furnace”: so that it complemented the following materials and chemical reaction.
1) Injected fuel, water content, oxygen enrichment, SiO2, and CaO were complemented to the reaction raw materials.
2) Ignition loss, reducing process of hydrogen, reduction of SiO2 and MnO, decomposition of coke and water content, and combustion of injected fuel were complemented to the chemical reaction.
According to this model, the equation of relation between reaction raw materials and reaction products (I/O-BE: Input/Output-Basic Equation) could be derived. Furthermore, it was necessary that the calculating methods of reaction products should be chosen not material balance of C and O but all reaction product analysis data.
Finally, it was shown that the calculating methods of reaction products could be linearized with quite good accuracy by process data.
