Method for determining gas condition of reducing gas, gas condition determination program, gas condition determination device and filling condition determination method for ore raw material

摘要

Problem to be solved: to reduce the computational load in the mathematical model and to match the gas condition between two adjacent computing regions in the height direction of the furnace.A filling layer (ore layer and coke layer) is assumed to be a calculation region in which the mathematical model is applied.A predetermined region in the furnace height direction is partitioned by a plurality of calculation regions arranged in the furnace height direction.The initial condition is set as the inflow gas condition for each calculation region, and the flow rate condition from each calculation region is calculated.The runoff gas condition calculated in the lower calculation region is set as the inflow gas condition in the upper computing region, and the runoff gas condition in each calculation region is calculated.The calculation process is repeated to determine the gas conditions in the blast furnace when one or more of the conditions a to C are satisfied.(a) the difference between the outflow gas condition in the lower calculation region and the inflow gas condition in the upper computing region is within the allowable range, and (b) the residual residual and / or carbon balance residuals in the blast furnace are less than or equal to the threshold value, and C) the reduction rate due to the predetermined definition converges.Diagram