炉体冷却壁黏结物物相及形成机理

Composition and formation mechanism of adhesive in blast furnace cooling stave

基于湘钢3号高炉破损调查,对高炉炉腰、炉腹以及炉身下部的黏结物进行取样,通过X线衍射(XRD)以及扫描电镜能谱分析(SEM-EDS)等手段,系统研究高炉不同位置黏结物的化学成分及微观形貌,分析高炉炉体冷却壁黏结物的物相组成和形成机理。研究结果表明:高炉炉体不同高度部位黏结物的物相组成和沉积行为显著不同,黏结物的物相主要为氧化锌-C和渣铁混合物。结合氧化锌在冷却壁热面沉积行为的热力学条件,分析氧化锌-C型黏结物因氧化锌易被还原而导致黏结物频繁脱落,不利于高炉炉体冷却壁长寿,而形成的高炉渣铁黏结物可以有效地隔离高温物料、煤气与冷却壁的直接接触,延缓物料对冷却壁的磨损等侵蚀,保障高炉冷却壁的寿命。

Based on the damage investigation of No.3 blast furanc(BF) in Xiangtan Iron and Steel Co.,the adhesive of the blast furnace belly,bosh and the lower part of furnace shaft were sampled.Through X-ray diffraction(XRD) and scanning electron microscope-energy dispersive spectrometer (SEM-EDS) analysis,the chemical composition and microstructure of the adhesive at different positions of BF were systematically studied,and the phase composition and formation mechanism of the adhesive were investigated.The results show that the phase composition and deposition behavior of the adhesive at different heights of the BF body are significantly different.The main phase of the adhesive is zinc oxide C and slag-iron mixture.Combined with the thermodynamic conditions of the deposition behavior of zinc oxide on the hot surface of the cooling stave,analysis is made and it is found that the zinc oxide C adhesive is frequently collapsed due to zinc oxide reduction,which is not conducive to the longevity of the BF body.The formed slag-iron adhesive can effectively isolate the direct contact between high-temperature materials,gas and cooling stave,delay the erosion of cooling stave,thereby ensure the long campaign of the BF cooling stave.