Abstract
The present study deals with one theoretical attempt which optimizes the conditions of pulverized coal injection in ironmaking blast furnaces. Firstly, pulverized coal combustion in the raceway zone is analyzed based on a simplified raceway zone model. Then the derived result is used together with the blowpipe zone combustion theory in order to estimate the optimum coal injection and blasting conditions. In this optimization, two factors are proposed. One is the burnout factor indicating the possibility of complete burnout of injected coal within the raceway zone. The other is called the ash deposition factor showing the possibility of fused coal ash deposition on the blowpipe or tuyere wall. These two values less than unity predict a good operation of coal injection to be achieved. Some practical data of coal injection in Japanese blast furnaces are used to examine the derived theory. Also some sensitivity tests of the theory are undertaken in order to clarify the effects of some operational parameters on the burnout and ash deposition factors.
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