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K2CO3和Na2CO3催化焦炭与CO2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CO2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;K2CO3的催化作用高于Na2CO3的催化作用.
The condition of gas flow condition and temperature condition in lump zone of blast furnace is simulated. The impacts of particle size,coke quenching way and coke types affecting coke deterioration in lump zone of blast furnace were studied. In addition,the catalyze mechanism of K2CO3 and Na2CO3 catalyzing CO2 and coke reaction were also stud-ied. The results show that:small size coke and wet quenching coke have higher loss mass and generate more powder than large size coke and dry quenching coke;Stamping coke deterioration degree is less than top charging coke in the initial re-action,as reacting time increases,stamping coke deterioration increases obviously and is higher than that of the top charg-ing coke;Alkali metal and coke ash formed in a kind of catalyst complex. The complex causes that the initial reaction tem-perature decrease,and destroys the crystal structure,causing loss mass increased and coke getting powdery heavily;The catalytic effect of K2CO3 is higher than Na2CO3.
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