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低CSR焦炭可用于高炉炼铁的机理探讨
Discussion on the mechanism of low CSR coke used in blast furnace ironmaking
李杰,程欢*,梁英华,黄世平
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作者单位:河钢集团石钢公司 技术中心;华北理工大学 化学工程学院; 河钢股份有限公司 钢研院
中文关键字:焦炭; 温度条件; 热强度;溶损反应模式
英文关键字:coke; temperature conditions; thermal strength; solution loss reaction mode
中文摘要:通过对多温度条件下的热性能及微观结构研究,探讨低CSR焦炭可用于高炉炼铁的机理。采用自主研发的焦炭多温度条件下的热性能检测方法,考察不同温度条件下焦炭的热性能变化,并尝试采用微观的光学组织和气孔结构信息解释宏观热性能随温度的变化规律。实验结果表明:低CSR的CH焦炭虽然低温区(1050℃、1100℃)的热强度CSR25值较低,但在1150℃与XY焦炭实现交叉,高温区(>1150℃)的热强度CSR25值较高。CH焦炭的光学组织各向异性程度偏低,气孔中小孔径孔数量多。低CSR的CH焦炭在高温区具有较高的热强度值是该焦炭可用于高炉炼铁的主要原因,说明国标CRI、CSR方法只检测1100℃一个温度点是不够的。CH焦炭光学组织各向异性程度低导致气孔壁基质与CO2发生化学反应速率快,气孔结构中小孔径孔数量多导致内扩散阻力大,两者之间的竞争关系导致CH焦炭的溶损反应模式很快达到表面劣化,保护了焦炭内核,使CH焦炭在高温区具有较高的热强度,这是低CSR的CH焦炭可用于高炉炼铁更深层次的机理。
英文摘要:The mechanism of low CSR coke used in blast furnace ironmaking was discussed by studying its thermal properties under multi-temperature conditions and microstructure. The thermal properties of coke under different temperatures were investigated by the self-developed thermal performance testing method under multi-temperature conditions. The micro optical texture and pore structure information were used to explain the variation of macro thermal properties with temperature. The experimental results show that, although the thermal strength CSR25 value of low CSR coke CH is lower in low temperature region (1050℃, 1100℃), it crosses with XY coke at 1150℃, and then in high temperature region (>1150℃), the thermal strength CSR25 value is higher. The anisotropic degree of CH coke optical texture is lower, but its small pores number in the proportion of all pores is more. The high thermal strength value of low CSR CH coke in high temperature region is the main reason why it can be used in blast furnace ironmaking. It is indicated that the national standard CRI, CSR method detecting only one temperature of 1100℃ is not enough. The low anisotropic degree of CH coke optical texture results in the fast chemical reaction rate between its pore wall matrix and CO2, and the large number of small pores leads to large internal diffusion resistance. The competitive relationship between the above two causes results in the solution loss reaction mode of the CH coke quickly reaching the surface degradation, which protects the core of the coke, and makes the CH coke have higher thermal strength value in high temperature region. This is the deeper mechanism that the low CSR CH coke can be used in blast furnace ironmaking.
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