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基于国内转底炉直接还原炼铁在起步阶段亟待解决的热工系统问题,分别以系统分析、热模拟实验和数值模拟为手段,对转底炉分段热工参数进行了研究.建立了转底炉冶金模型和热模型(涉及变量83个、参数20个),模拟计算结果表明,每生产1t金属化球团,需铁精粉1213kg,消耗煤粉283kg、煤气615kg.基于转底炉分区域系统分析,分别进行了预热段、加热段、还原段条件下的热模拟实验研究,确定出不同工况下(nC∶nO=0.8~1.2)含碳球团于各段的实时还原进度,并依据含碳球团自还原吸热与热工参数的匹配,确定出各段燃料供应参数.使用Fluent模拟软件对分段热工参数进行了验证,结果表明分段热工参数设计合理,能有效实现转底炉的分段职能,为转底炉的优化设计提供了基础.
Based on the problems of the thermal system which need to be solved in the initial stage of direct reduction ironmaking by rotary hearth furnace in domestic, the thermal parameters of rotary hearth furnace are studied by means of system analysis, thermal simulation and numerical simulation respectively. The metallurgical model and thermal model of the hearth (83 variables and 20 parameters) were simulated. The results show that for each 1t metallized pellet, 1213kg of iron powder, 283kg of pulverized coal and 615kg of gas are required. Regional system analysis, respectively, the preheating section, heating section, the reduction section of the thermal simulation experimental study to determine the different conditions (nC: nO = 0.8 ~ 1.2) carbon pellets in each section of the real-time reduction schedule , And the fuel supply parameters of each section were determined according to the matching between self-reduction endotherm of carbon-containing pellets and thermal parameters.The thermal parameters of the section were verified by using Fluent simulation software.The results showed that the thermal parameters of section were designed reasonably, It can effectively realize the segmental function of rotary hearth furnace and provide the foundation for the optimal design of rotary hearth furnace.