Effect of oxygen content variation in blast and oxygen-coal lance on burnout rate of pulverized coal
In order to further increase the amount of coal injection and reduce the coke ratio,and achieve cost decrease and efficiency increase of the enterprise,Shougang Jingtang United Iron and Steel Co.,Ltd.carried out research on high oxygen-enriched blast smelting technology for blast furnace in combination with its own production situation.Experimental tests and numerical simulation were used to carry out research on the influence of changes in the oxygen content in the blast and oxygen-coal lance on the state of the raceway and the burnout rate of pulverized coal.After the oxygen enrichment rate increases from 7%to 11%,the pulverized coal burnout rate of the two coal blending schemes increased from 77.10%to 82.71%and 78.43%to 82.62%,respectively,under the same coal ratio,but the burnout rate decreases with the increase of the coal ratio.After the oxygen flow rate in the oxygen-coal lance increases from 3000m3/h to 6000m3/h,the maximum temperature along the direction of the pulverized coal stream increases from 2 762 K to 2802 K,and the burnout rate of pulverized coal increases from 72.31%to 75.12%.Simultaneously,adopting the above two oxygen-enrichment methods can realize large-scale coal injection and high-oxygen-enrichment injection,achieve the expected goal of coke reduction,and obtain good economic benefits.
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