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模拟高炉块状带气流和温度条件,研究了粒度、熄焦方式和焦炭类型对焦炭劣化影响,以及高炉上部碱金属K_2CO_3和Na_2CO_3催化焦炭与CO_2的反应机理。结果表明:小粒度焦炭和湿熄焦炭失碳率较高,产生的粉末量多;捣固焦炭在反应开始时劣化程度低于顶装焦炭,随着反应时间增加,劣化程度高于顶装焦炭;碱金属会与焦炭中的灰分形成催化复合物,导致焦炭与CO_2反应的起始温度降低,破坏焦炭的微晶结构,失碳率增加,粉化加重;K_2CO_3的催化作用高于Na_2CO_3的催化作用。
The effects of particle size, coke quenching mode and coke type on the coke deterioration were studied. The reaction mechanism of coke with CO_2 catalyzed by alkali metal K_2CO_3 and Na_2CO_3 in the upper part of the blast furnace was studied. The results show that the carbon loss rate of small size coke and wet quenching coke is high, and the amount of powder produced is more; the degree of deterioration of tamping coke at the beginning of reaction is lower than that of top coke, and as the reaction time increases, the degradation degree is higher than that of top coke ; The alkali metal will form a catalytic composite with the ash in coke, resulting in the decrease of initial temperature of coke reaction with CO 2, the destruction of coke’s microcrystalline structure, the increase of carbon loss and the increase of pulverization; the catalytic effect of K 2 CO 3 is higher than that of Na 2 CO 3 effect.