低热值高炉煤气在预热空气作用下的扩散燃烧特性  

Diffusion combustion characteristics of low calorific value blast furnace gas under preheated air

作　　者：鲁春平 周飞帆 陈烨 万琴[4] 刘波[4] 何金桥[3] LU Chunping;ZHOU Feifan;CHEN Ye;WAN Qin;LIU Bo;HE Jinqiao(MCC(Xiangtan)Heavy Industry Equipment Co.,Ltd.,Xiangtan 411100,Hunan,China;School of Electrical Engineering,Southwest Jiaotong University,Chengdu 610031,Sichuan,China;College of Energy and Power Engineering,Changsha University of Science&Technology,Changsha 410114,Hunan,China;College of Electrical and Information Engineering,Hunan Institute of Engineering,Xiangtan 411101,Hunan,China)

机构地区：[1]中冶京诚(湘潭)重工设备有限公司,湖南湘潭411100 [2]西南交通大学电气工程学院,四川成都610031 [3]长沙理工大学能源与动力工程学院,湖南长沙410114 [4]湖南工程学院电气与信息工程学院,湖南湘潭411101

出　　处：《资源信息与工程》2022年第1期133-138,142,共7页Resource Information and Engineering

基　　金：长沙市科技计划重点研发项目(kq1901103)。

摘　　要：本研究以某钢铁企业高炉煤气回收水冷系统为对象,分析研究了低热值高炉煤气与不同预热温度空气的同轴扩散气流在绝热炉膛内混合和燃烧的特点,建立了κ⁃ε双方程燃烧数学模型,并对其同轴扩散气流燃烧特性进行了模拟研究。研究结果表明:空气预热温度的升高能够有效促进化学反应活性较差的CO参与燃烧反应,同时CO化学反应速度也得到有效提高,并使得高炉煤气的大量可燃成分更多地聚集在距离燃烧器气流出口0.1~0.2 m的范围内得以燃烧。在空气预热作用下,高炉煤气中的可燃成分的燃尽性能都有所下降,其中CH_(4)的燃尽性能下降最为显著。这有利于缩短低热值难以着火的高炉煤气的燃烧行程,有效促进高炉煤气中的CO的燃烧,有利于燃烧装置结构的优化及高炉煤气的回收利用。According to a water⁃cooling system for recovery of blast furnace gas in an iron and steel enterprise,the mixing and combustion characteristics of low calorific value blast furnace gas and coaxial diffused air at different preheating temperatures in an adiabatic furnace were analyzed and studied.The k⁃εtwo⁃phase combustion mathematical model was established,and the combustion characteristics of coaxial diffused air were simulated.The results showed increasing air preheating temperature can effectively promote the participation of CO in the combustion reaction with less chemical reactivity,and at the same time,the CO chemical reaction speed also effectively increased.Moreover,a large number of combustible components of blast furnace gas was more concentrated within the range of 0.1 to 0.2m from the outlet of the burner for combustion.Under the action of air preheating,the burnout performance of all combustible components in blast furnace gas decreased,and the burnout performance of CH_(4) decreased most obviously.It was beneficial to shorten the combustion stroke of low calorific value and hard to ignite blast furnace gas,effectively promoted the combustion of CO in blast furnace gas,and was beneficial to the optimization of combustion device structure and the recovery of blast furnace gas.

关 键 词：高炉煤气 低热值 预热温度 扩散燃烧 燃烧特性 

分 类 号：TK16[动力工程及工程热物理—热能工程]