顶燃式热风炉燃烧器节能低排高风温优化分析  

Optimal Analysis of Low Emission and High Temperature for Top-fired with Energy Saving

作　　者：张步超 周鹏飞 于经纬 朱晓龙 张林 ZHANG Buchao;ZHOU Pengfei;YU Jingwei;ZHU Xiaolong;ZHANG Lin(Xi’an Aerospace Yuan Dongli Engineering Co.Ltd.,Xi’an 710100,China)

机构地区：[1]西安航天源动力工程有限公司,陕西西安710100

出　　处：《工业加热》2024年第10期53-58,共6页Industrial Heating

摘　　要：针对顶燃式热风炉出现的NO_(x)排放超标、能耗较高、热风温度不达标等问题,提出一种新的优化思路。以某厂的高炉热风炉为研究对象,利用CFD技术对热风炉燃烧器的运行工况和优化后的工况进行燃烧模拟,通过对顶燃式热风炉建立模型与数值计算,分析了在运行工况下燃烧室的燃烧过程、速度场和温度场,得出了负荷与空燃比等因素对热风炉内燃烧流场及组分分布的影响,并根据计算结果提出了热风炉节能低排放的优化措施。通过对负荷进行优化以及增设智能低氧控制系统对空燃比精准控制后,热风炉排放烟气中的NO_(x)含量可降低至200 mg/m^(3)(标准)以下;每个烧炉周期较现运行工况下可节约31760m^(3)(标准)的高炉煤气以及128560 m^(3)(标准)的助燃空气;可提高理论热风温度30℃左右,降低高炉焦比消耗约2.4 kg/t,相应的每吨生铁成本减少5.76元。In view of the problems of excessive NO_(x)emissions,high energy consumption,and substandard hot air temperature in top-fired hot blast stoves,a new optimization idea was proposed.Taking the blast furnace hot blast stove of a certain factory as the research object,CFD simulation technology is used to simulate the operating conditions and optimized working conditions of the hot blast stove burner.The combustion process,velocity field and temperature field of the combustion chamber under operating conditions were analyzed,and the influence of factors such as load and air-fuel ratio on the combustion flow field and component distribution in the hot blast stove were obtained,and based on the calculation results,a hot blast stove.After optimizing the load and adding an intelligent low-oxygen control system to precisely control the air-fuel ratio,the NO_(x)content in the exhaust gas of the hot blast stove can be reduced to below 200 mg/Nm^(3);Each furnace cycle can save 31760 Nm^(3)of blast furnace gas and 128560 Nm^(3)of combustion-supporting air compared with the current operating conditions;it can increase the theoretical hot air temperature by about 30 C,reduce the coke consumption of the blast furnace by about 2.4 kg/t,and the corresponding pig iron cost per ton is reduced by 5.76 yuan.

关 键 词：顶燃式热风炉 数值模拟 低氧控制 节能低排 

分 类 号：TG155.12[金属学及工艺—热处理] TK01.8[金属学及工艺—金属学]