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为发展和深入认识转底炉直接还原工艺技术,建立了转底炉综合数学模型,该模型由转底炉本体热化学平衡、转底炉区域热平衡计算模型、余热回收模型、生球干燥模型、炉膛温度校核与尾气露点校核模型和转底炉流程模型组成.采用综合模型计算了该工艺流程的基本工艺参数.计算结果表明:煤气热值、废气排放温度和余热回收利用方案对整体能量消耗有不同程度影响,煤气发热值每增加50 kJ·m 3,理论燃烧温度提高22~25℃,煤气用量减少41~47 m3·t 1;空气预热温度平均每增加100℃,理论燃烧温度提高35~40℃,煤气用量减少90~103 m3·t 1.此外,应用此模型还可以计算任何原料和燃料等条件下的直接还原工艺参数,研究不同余热回收方案条件下的各个工艺参数的变化规律.
In order to develop and deepen the understanding of direct reduction process of rotary hearth furnace, a mathematical model of rotary hearth furnace is established. The model consists of thermochemical equilibrium of rotary hearth furnace, thermal equilibrium calculation model of rotary hearth furnace, heat recovery model, Furnace temperature and exhaust gas dew-point calibration model and rotary hearth furnace process model.A comprehensive model was used to calculate the basic process parameters of the process.The calculation results show that: the gas calorific value, exhaust gas temperature and waste heat recovery scheme for the overall energy The consumption of coal increases with the increase of 50 kJ · m 3 for each calorific value, the theoretical combustion temperature increases by 22-25 ° C and the gas consumption decreases by 41-47 m3 · t 1. The average air preheating temperature increases by 100 ° C, the theoretical combustion temperature Increase 35 ~ 40 ℃, reduce gas consumption 90 ~ 103 m3 · t 1. In addition, the application of this model can also calculate the direct reduction process parameters under any raw material and fuel conditions, study the different process conditions of waste heat recovery scheme of the various process parameters The law of change.