工程科学学报
工程科學學報
공정과학학보
Journal of University of Science and Technology Beijing
2015年
4期
499-508
,共10页
金鹏%姜泽毅%包成%陆元翔%张建良%张欣欣
金鵬%薑澤毅%包成%陸元翔%張建良%張訢訢
금붕%강택의%포성%륙원상%장건량%장흔흔
高炉%数学模型%煤气%循环%稳态%传热%反应动力学
高爐%數學模型%煤氣%循環%穩態%傳熱%反應動力學
고로%수학모형%매기%순배%은태%전열%반응동역학
blast furnaces%mathematical models%gas%recycling%steady state%heat transfer%reaction kinetics
结合风口回旋区燃烧和炉外煤气预热、脱除和循环的平衡关系,建立了氧气高炉一维气固换热与反应动力学模型,并采用传统高炉的运行和解剖数据对模型进行了验证分析.通过模型研究了氧气含量和上部循环煤气流量对氧气高炉炉内过程变量的影响规律.结果表明:氧气含量偏低和上部循环煤气流量不足时,会降低铁矿石还原效果,炉渣内出现大量未还原铁氧化物;氧气含量和上部循环煤气流量的提高可以有效提高炉内CO含量和铁矿石还原速度,但提高上部循环煤气流量会大幅提升炉顶煤气温度,增大热量损失.与传统高炉相比,氧气高炉内CO含量提高1.0~1.5倍,炉内气体还原性更强;铁矿石还原完成位置提高1.49 m,全炉还原反应速度更快;直接还原度降低55.2%~79.2%,炉内直接还原反应消耗的碳量更少.
結閤風口迴鏇區燃燒和爐外煤氣預熱、脫除和循環的平衡關繫,建立瞭氧氣高爐一維氣固換熱與反應動力學模型,併採用傳統高爐的運行和解剖數據對模型進行瞭驗證分析.通過模型研究瞭氧氣含量和上部循環煤氣流量對氧氣高爐爐內過程變量的影響規律.結果錶明:氧氣含量偏低和上部循環煤氣流量不足時,會降低鐵礦石還原效果,爐渣內齣現大量未還原鐵氧化物;氧氣含量和上部循環煤氣流量的提高可以有效提高爐內CO含量和鐵礦石還原速度,但提高上部循環煤氣流量會大幅提升爐頂煤氣溫度,增大熱量損失.與傳統高爐相比,氧氣高爐內CO含量提高1.0~1.5倍,爐內氣體還原性更彊;鐵礦石還原完成位置提高1.49 m,全爐還原反應速度更快;直接還原度降低55.2%~79.2%,爐內直接還原反應消耗的碳量更少.
결합풍구회선구연소화로외매기예열、탈제화순배적평형관계,건립료양기고로일유기고환열여반응동역학모형,병채용전통고로적운행화해부수거대모형진행료험증분석.통과모형연구료양기함량화상부순배매기류량대양기고로로내과정변량적영향규률.결과표명:양기함량편저화상부순배매기류량불족시,회강저철광석환원효과,로사내출현대량미환원철양화물;양기함량화상부순배매기류량적제고가이유효제고로내CO함량화철광석환원속도,단제고상부순배매기류량회대폭제승로정매기온도,증대열량손실.여전통고로상비,양기고로내CO함량제고1.0~1.5배,로내기체환원성경강;철광석환원완성위치제고1.49 m,전로환원반응속도경쾌;직접환원도강저55.2%~79.2%,로내직접환원반응소모적탄량경소.
A one-dimensional mathematical model based on heat transfer and reaction kinetics was developed for an oxygen blast furnace and was validated with the operating conditions and dissected data of a conventional blast furnace. The influence of oxygen concentration and upper gas volume on the smooth operation and process variables of the oxygen blast furnace was investigated by the model combined with coal combustion at tuyeres and top gas balance for separation and preheating. When the oxygen blast furnace with top gas recycling is of low oxygen concentration and upper gas volume, the reduction of iron ore is worsen and massive unreduced iron oxide comes into slag. In the oxygen blast furnace with top gas recycling, oxygen concentration and upper gas volume have significant effect on the temperature, reducing ability of gas and reduction rate. A comparative analysis of the conventional blast furnace and the oxygen blast furnace with top gas recycling show that the oxygen blast furnace has a higher reducing ability of gas ( 1. 0 to 1. 5 times higher for CO content), faster reduction rate (1. 49 m higher for the position of ore reduction), and less direct reduction (55. 2% to 79. 2% less for direct reduction degree) .