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| Coke deterioration mechanism in lump zone of blast furnace |
| Lü Qing-qing，DU Ping，ZHOU Jun-lan |
| Iron Making and Environment Group of Institute， Research of Iron and Steel of Jiangsu Povince Shasteel， Zhangjiagang 215625， Jiangsu， China |
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Abstract 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 studied. 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 reaction， as reacting time increases， stamping coke deterioration increases obviously and is higher than that of the top charging coke； Alkali metal and coke ash formed in a kind of catalyst complex. The complex causes that the initial reaction temperature 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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Received: 18 March 2015
Published: 06 January 2016
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2016, Vol. 51 
