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| THE FAILURE MECHANISM OF COAL LANCE IN BLAST FURNACE |
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| DOI： |
| KeyWord:PCI,Coal injection into the blast furnace,Injection lance,Oxidation,Erosion, |
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| Abstract: |
| Pulverized Coal Injection(PCI)is a key technology in modern ironmaking by blast furnace and the life of injection lance has a great influence on PCI operation and on normal running of blast furnace.For these reasons,it is important to research the failure mechanism of injection lance and to prolong its service life.Through monitoring some lances used in a blast furnace,it is found that the average service life of the lances made of 1Cr18Ni9Ti is about 32 days under normal blast furnace operating conditions.The main reasons for failure of the lances are their outer surface oxidation and the inner surface erosion.The failure mechanism of outer surface oxidation is further analyzed based on reaction thermodynamics,and it is explained by microcut theory and gas-particle flow that how the ditch-shaped crack forms on inner surface and why the underside of injection lance is abraded firstly. |
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