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Synopsis : In order to carry out a blow-out operation with emptying a blast furnace without those troubles as the channeling, the overheat of top gas and the abnormal drop of hot metal temperature , a system has been developed to establish an operation schedule by means of a two-dimensional gas flow model and an one dimensional dynamic model. In this system, the two-dimensional gas flow model is used for the simulation of the blast furnace gas flow pattern at each stage in the operation to evaluate the critical blast volume to the channeling and the one-dimensional dynamic model is used to predict the transitions of the stock level , the top gas tempera ture and the hot metal temperature during the operation to build a blasting schedule to avoid the chan neling and a water sprinkling schedule to avoid the overheat of top gas and to set the coke rate just before the operation to prevent hot metal temperature from the abnormal drop . This system was applied to the emptying blow-out operation of Kokura No . 2 blast furnace in March 1981, to give satisfactory result.

Investigation of the Empty Blow-out Operation of Blast Furnace through Mathematical Simulation Model