熔融还原高温煤气余热改质的数值分析  

Numerical analyses on reforming of high-temperature gas of smelting reduction using itself exhaust heat

作　　者：李强[1] 高攀[1] 冯明霞[2] 邹宗树[1] 

机构地区：[1]东北大学材料与冶金学院,辽宁沈阳110819 [2]辽宁科技学院冶金工程学院,辽宁本溪117022

出　　处：《中南大学学报（自然科学版）》2013年第6期2575-2582,共8页Journal of Central South University:Science and Technology

基　　金：国家"十二五"科技支撑计划项目(2011BAE04B01;2011BAE04B02);国家自然科学基金资助项目(50774019;51174053;51104037);教育部高等学校博士学科点专项科研资金资助项目(200801451091)

摘　　要：针对熔融还原反应器产生的高温煤气不能直接进入预还原反应器,提出在两步法熔融还原工艺中耦合煤气改质反应器,建立能量平衡和动力学模型,对待改质气的温度和成分与改质后还原势及富氢程度的关系进行计算,定量给出改质炉设计的2个关键参数碳基填充床高度和碳颗粒粒度对改质过程的影响。研究结果表明:在满足预还原要求温度条件下,COREX终还原炉煤气经改质氧化度可由0.100降至0.065,HiSMELT熔融还原炉炉顶煤气氧化度可由0.625降至0.223。煤气改质使熔融还原产生的高温煤气自身废热物理能转变为还原势化学能,使煤气的能量利用更加高效、合理。To solve the problem that high temperature gas of final reduction reactor of smelt reduction process cannot be directly introduced into the pre-reduction reactor, the new gas reforming reactor was presented in combination with the two-step smelting reduction process. Based on the energy balance and thermodynamic model, the relationship between the temperature, and composition and reduce potential energy, and rich-hydrogen content was calculated. After that, it was quantities discussed effect of height of packed bed and size of carbon particle, which were the two key parameters for the design of reforming reactor. The results show that through the reforming the oxidation degree of the COREX gas decreases to 0.065, from original 0.100, the oxidation degree of the HiSMELT gas decreases to 0.223, from original 0.625 The gas reforming made the physical energy of high temperature gas exhaust heat convert into chemical potential energy, and energy utilities is more efficient and reasonable.

关 键 词：熔融还原 煤气改质 碳基填充床 数值模拟 

分 类 号：TF557[冶金工程—钢铁冶金]