Failure Mechanism and Material Requirements for Coal Lance in Blast Furnace

作     者：XIONG Wei JIA Juan CHEN Jia-chao SHANG He-ming 

作者机构：Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of EducationWuhan University of Science and Technology Wuhan 430081 Hubei China 

出 版 物：《Journal of Iron and Steel Research International》 (J. Iron Steel Res. Int.)

年 卷 期：2012年第19卷第4期

页      面：11-16页

核心收录：

学科分类：081702[工学-化学工艺] 080602[工学-钢铁冶金] 08[工学] 0817[工学-化学工程与技术] 0806[工学-冶金工程] 

基　　金：Sponsored by National Natural Science Foundation of China(50901054) Hubei Provincial Natural Science Foundation of China(2009CDB401) 

主　　题：blast furnace coal lance failure mechanism material requirements 

摘      要：Pulverized coal injection（PCI） is a key technology in modern ironmaking by blast furnace（BF） and the life of injection lance has a great influence on PCI operation and on normal running of blast *** is found that the main reasons for the failure of the lances are their outer surface oxidation and the inner surface erosion through monitoring some lances used in *** outer surface oxidation of the lances made of lCr18Ni9Ti is inevitable under high hot blast temperature condition through thermodynamics analysis.A mathematical model for calculating the temperature of common monocular coal lance had been developed according to the principles of mass and energy *** temperature and flow velocity of the hot blast would cause a rise in the lance *** influence of hot blast temperature is more *** lance temperature would decline when compressed air flux *** technology of dense phase pulverized coal is beneficial to extending lance’s life because decreasing solid-gas ratio would intensify erosion and burning *** anti-oxidation temperature of lance materials needs to be over 1000 ℃ for BF intensified *** order to increase the resistance to oxidation of the coal lance’s outer surface,oxidation-resistant steel or Al coating stainless steel is the appropriate material for BF *** the metal surface treatment technology to enhance the hardness of the coal lance’s internal surface could prolong the service life of coal lance