炉顶煤气循环氧气高炉的能耗和碳排放  

Energy consumption and carbon emission of oxygen blast furnace with top gas recycling

作　　者：金鹏[1] 姜泽毅[1,2] 包成[1,2] 陆元翔 张欣欣[1,3] 

机构地区：[1]北京科技大学机械工程学院 [2]北京科技大学北京高校节能与环保工程研究中心 [3]北京科技大学冶金工业节能减排北京市重点实验室

出　　处：《冶金能源》2015年第5期11-18,共8页Energy For Metallurgical Industry

基　　金：国家自然科学基金项目(51134008);国家重点基础研究发展计划(2012CB720405)

摘　　要：基于相间传热传质和反应动力学理论,建立了由高炉本体一维模型、风口回旋区燃烧模型、CO2脱除单元模型和煤气预热单元模型组成的炉顶煤气循环氧气高炉工艺综合模型,研究了该新型炼铁工艺的可行性,分析了关键参数对综合能耗和碳排放的影响。研究结果表明：下排风口循环煤气流量需要维持在一定范围内来保持合理的理论燃烧温度;低温和高还原势的炉内环境有利于抑制焦炭气化反应,加强铁氧化物间接还原;氧气高炉的煤气输出量较少,但热值很高,能达到传统高炉煤气热值的2倍以上;焦炭消耗的减少显著降低了氧气高炉的输入总能量,即便是与副产煤气全部有效利用的传统高炉相比,氧气高炉仍具有综合能耗较低的优势;由于氧气鼓风和CO2分离过程消耗大量电力,氧气高炉的CO2间接排放要高于传统高炉,而CO2捕集和封存可显著降低氧气高炉系统的CO2直接排放;与传统高炉相比,氧气高炉系统的CO2直接排放可降低57.1%~59.0%,净排放可降低32.9%~40.4%,节碳减排效果显著。A comprehensive model of the oxygen blast furnace with top gas recycling , including the one-dimensional stack and bosh model , the combustion zone model , the CO2 removal unit model and the recycled gas preheating model , was developed based on the transport phenomena theory and reac -tion kinetics .The comprehensive model was used to analyze the feasibility of the new iron making process and the influence of key parameters on the energy consumption and the carbon emission .The results show that the top gas recycled at the main tuyeres should be maintained within a reasonable range to guarantee the correct theoretical combustion temperature .The oxygen blast furnace generates less top gas, yet its top gas is of higher calorific value , which is over twice that of the conventional blast furnace gas .Although the conventional blast furnace gas is assumed to be used totally outside , the energy consumption of the oxygen blast furnace is lower than the conventional operation due to the significant reduction of coke consumption .The indirect CO 2 emission of the oxygen blast furnace is ver-y high because of the oxygen blast and CO 2 stripping , while the direct CO 2 emission is greatly reduced as a result of the CO 2 capture and storage in the process .Compared with the conventional blast fur-nace, the oxygen blast furnace reduces the direct CO 2 emission by 57.1%~59.0% and the net CO2 emission by 32.9%~40.4%.

关 键 词：氧气高炉 煤气循环 数学模型 综合能耗 碳排放 

分 类 号：TF54[冶金工程—钢铁冶金]