Modeling and Simulation of the MIDREX Shaft Furnace: Reduction, Transition and Cooling Zones
Modeling and Simulation of the MIDREX Shaft Furnace: Reduction, Transition and Cooling Zones
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DOI：
10.1007/s11837-015-1588-0
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发表时间：
2015-11-01
期刊：
影响因子：
2.6
通讯作者：
Moazeni, Faegheh
中科院分区：
文献类型：
--
作者：
Shams, Alireza;Moazeni, Faegheh
钢铁工业中使用的金属铁主要通过直接还原工艺获得。本文研究的重点是对MIDREX技术的炉膛进行模拟。MIDREX技术是世界上最重要的气基直接还原铁（DRI）工艺，包括还原区、过渡区和冷却区。还原区被认为是一个逆流气-固反应器，从铁矿石球团生产海绵铁。过渡区具有足够的高度以将还原区和冷却区彼此隔离，并且冷却区将固体产物冷却至约50摄氏度。每个区域都有一个反应系统。同时质量和能量平衡沿着还原区导致一组常微分方程的两点边界条件。在平衡条件下研究了过渡区和冷却区，得到了一组代数方程。通过求解这些方程组，我们确定了沿炉沿着的材料浓度、温度和压力。我们的结果与Parisi和拉博德（2004）报道的真实的MIDREX工厂的数据吻合良好。利用该模型，研究了反应器长度和冷却气体流量对金属化的影响以及冷却气体流量对固相出口温度的影响。这些新发现可用于最大限度地减少消耗的能量。
Metallic iron used in steel industries is mostly obtained from a direct reduction process. The focus of this study is to simulate the furnace of the MIDREX technology. MIDREX technology which is the most important gas-based direct reduced iron (DRI) process in the world, includes reduction, transition and cooling zones. The reduction zone considered as a counter current gas-solid reactor produces sponge iron from iron ore pellets. The transition zone has sufficient height to isolate the reduction zone and cooling zone from each other and the cooling zone cools the solid product down to around 50A degrees C. Each zone has a system of reactions. Simultaneous mass and energy balances along the reduction zone lead to a set of ordinary differential equations with two points of boundary conditions. The transitions and cooling zone are investigated at the equilibrium condition leading to a set of algebraic equations. By solving these systems of equations, we determined the materials concentration, temperature, and pressure along the furnace. Our results are in a good agreement with data reported by Parisi and Laborde (2004) for a real MIDREX plant. Using this model, the effect of reactor length and cooling gas flow on the metallization and the effect of cooling gas flow on the outlet temperature of the solid phase have been studied. These new findings can be used to minimize the consumed energy.