中低温热解半焦作为高炉喷吹燃料的现状分析及建议

Research status and suggestion of mid-low temperature pyrolysis semi-coke as the PCI fuel in blast furnace

为优化高炉燃料结构和降低生产成本,从半焦的基础性能、工艺性质、喷吹效果等方面论述了中低温热解半焦作为高炉喷吹燃料的研究现状,分析了半焦替代喷吹煤粉后存在的主要问题,提出了改善半焦性能的途径和建议。现有中低温热解半焦的煤质特征和多数工艺性质满足高炉喷吹要求,但其可磨性与燃烧性能波动较大,需区别对待。随着半焦添加比例的增加,混煤的燃烧和可磨性能总体呈下降趋势。提出应通过热解过程控制、与其他燃料共热解、催化燃料等方式改善低温干馏半焦性能,增加廉价燃料在喷吹燃料中所占比例,降低高炉炼铁成本。

In order to optimize the structure of blast furnace fuel and reduce the production cost,the research status of low temperature pyrolysis semi-coke as the fuel of blast furnace was discussed from the aspects of the basic properties,technological properties and injection effects.The main problems existed in the semi-coke instead of the coal powder were analyzed.The quality of status middle-low temperature pyrolysis semi-coke and most of the technical process met the requirements of the blast furnace,while the grindability and combustion performance of semi-coke fluctuated greatly. With the increase of semi-coke proportion,the combustion and grinding performance of mixed coal presented a declining trend.The quality could be improved by controlling the pyrolysis process of fuel and other co-pyrolysis and catalytic fuel,the ironmaking cost could be reduced by increasing the proportion of cheap fuel in the injection fuel.