Abstract
A mathematical model for sintering process at Mizushima Works was developed using a super capacity computer (M-200), and some operation cases were simulated to obtain useful operation guidance by this model.
One of characteristics of the model is a calculation method for heat capacity and diameter of particles of raw mixture for sinter. The present conception that particles of ore, lime, and coke are considered to be homogenized is the same one as in treating the heat transfer behavior of perfectly mixed gas. Analyses of optimum conditions of temperature pattern in ignition furnace, volume distribution of suction air along strand and coke contents distribution in direction of sintering bed height by the simulation model gave results as follows;
(1) For saving combustion gas consumption for ignition furnace, it is effective to keep the peak temperature high and the peak time short.
(2) To reduce coke consumption, it is especially important to control the size distribution of coke within a narrow rang.
(3) To maintain the same heat hysteresis along the height of sintering bed, the difference of coke contents between upper layer and lower layer must not exceed 0.5%.
(4) By the control of air volume distribution along strand and of coke contents distribution in direction of sintering bed height, fluctuations of heat index (Q900) and cooling rate index (CT1100) in direction of sintering bed height can be eliminated, and precise quality control can be promoted in near future.
