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用于高炉炼铁的低CSR焦炭机理探讨
Study on the Mechanism of Low CSR Coke Used in Blast Furnace Iron Smelting
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- DOI:
- 作者:
- 李杰 程欢 梁英华 黄世平
LI Jie;CHENG Huan;LIANG Yinghua;HUANG Shiping
- 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
Technical Centre,HBIS Group Shisteel Company,Shijiazhuang050031,China;School of Chemical Engineering,NorthChina University of Science and Technology,Tangshan063210,China;Steel Institute,HBIS Group,Shijiazhuang050023,China
- 关键词:
- 焦炭 温度条件 热强度 溶损反应模式
coke temperature conditions thermal strength solution loss reaction mode
- 摘要:
- 通过对多温度条件下的热性能及微观结构研究,探讨可用于高炉炼铁的低CSR焦炭机理。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,并采用微观组织和气孔结构分析,解释宏观热性能随温度的变化规律。结果表明,低CSR的CH焦炭虽然低温区(1 050℃、1 100℃)的热强度CSR25值较低,但在1 150℃与XY焦炭实现交叉,高温区(>1 150℃)的热强度CSR25值较高。CH焦炭的组织各向异性程度偏低,中小孔径气孔数量多。低CSR的CH焦炭在高温区具有较高的热强度值,这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1 100℃一个温度点是不够的。CH焦炭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,结构中小孔径气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。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 self-developed thermal performance test method for coke under multi-temperature conditions was adopted to investigate the changes of thermal performance of coke under different temperature conditions,and the microstructure and stomatal structure were analyzed to explain the changes of macroscopic thermal performance with temperature.The results show that low CH coke though the low temperature zone of CSR(1 050℃and 1 100℃)thermal intensity CSR25 value is low,but in 1 150℃and XY coke to realize cross,high temperature(>1 150℃)thermal intensity CSR25 value is higher.The anisotropy of CH coke is low,and the number of small and medium diameter pores is high.Low CH coke at high temperature of CSR has high thermal strength value,this is the main cause of coke can be used for blast furnace ironmaking,it is indicated that the national standard method of CRI,CSR only testing one temperature of 1 100℃is not enough.The low degree of anisotropy in CH coke structure leads to the rapid chemical reaction rate between the stomatal wall matrix and CO2.The number of pores with small and medium diameter in the structure leads to large internal diffusion resistance.The competitive relationship between the two results in the dissolution loss reaction mode of CH coke quickly reaching the surface degradation,which protects the core of the coke and makes the CH coke have higher thermal strength in the high temperature area.This is the deeper mechanism that the low CSR CH coke can be used in blast furnace ironmaking.