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A 3 dimensional sinter process mathematical simulation model has been developed for the purpose to make it possible the designs of sinter process from the stereoscopic viewpoint. This sinter process model can calculate not only the progress of sintering reactions and the resultant changes in the bed structures such as pore ratio and minerals composition but also the qualities of produced sinter. Through a pot sintering test, this sinter process model was confirmed authentic and able to calculate also the distributions of sinters property such as minerals composition inside sinter cake. This sinter process model was used for the analysis of the effects of gas flow plate on the sintering performance.

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Theoretical study was made on the reasonable use of oxygen in the blast furnace to achieve both high productivity and low fuel rate with one dimensional blast furnace mathematical simulation model and following results were obtained. (1) There exist an optimum oxygen concentration and an optimumflame temperature and the increase of the oxygen concentration straightly results in the increases of fuel rate.(2)By the combined injection of pulverized coal with the increase of oxygen concentration to control the flame temperature at an optimumvalue of about 21 OO'C, both high productivity and low fuel rate can be achieved.KEYWORDS: blast furnace; oxygen; pulverized coal; mathematical model. 1. IntroductionThe blast furnace is a current leading ironmaking process with many features such as high productivity and high heat efficiency. However, high quality coke as well as high quality ore is necessary to achieve these features. As shown in Fig. 1 Effect ofthe ore injection on the blast furnace operation with oxygen enriched cold blast.operation were studied using the mathematical model. The fuel rate, the coke rate, the pulverized coal rate (Coal rate) andthe productivity of the blast furnace using oxygen enriched blast combined with the injection of pulverized coal were calculated as shown in Fig. 7

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