高炉煤气/煤粉掺烧锅炉富氧燃烧和NO_x排放特性研究  

Study on Characteristics of Oxygen-rich Combustion and Nitrogen Emissions of Blast Furnace Gas and Pulverized Coal Blended Combustion Boiler

作　　者：武生 傅旭峰 尹荣荣[2] 

机构地区：[1]华电电力科学研究院浙江杭州,310030 [2]华北电力大学能源动力与机械工程学院,河北保定071003

出　　处：《锅炉技术》2015年第3期43-47,69,共6页Boiler Technology

基　　金：国家高技术研究发展计划(863计划)基金赞助项目(2009AA05Z310);中央高校基本科研业务费专项资金资助项目(916021106)

摘　　要：针对某1 025t/h高炉煤气/煤粉混烧锅炉,用Fluent数值模拟软件对助燃气体(O2/CO2)中O2浓度分别为30%、35%、40%的3种富氧掺烧工况及常规空气氛围下的炉内燃烧过程进行数值模拟。结果表明:富氧工况下,在炉膛底部及燃烧器区域,烟气温度随着O2浓度的增大而升高,在燃烧器区域之后,呈现出相反的趋势,当O2浓度大于35%后,烟气温度已低于同位置处空气氛围下的烟气温度;NO浓度随着O2浓度的增大而升高,当O2浓度为40%时,NO浓度已超过常规空气工况,NO浓度的升高主要受到炉膛内氧浓度升高的影响。3种工况下的出口CO2都达到较高的水平,这样的水平有利于CO2的液化分离。综合分析,对于掺烧锅炉采用富氧燃烧技术时,初始氧浓度不应超过35%。Take a 300 MW blast furnace gas （BFG）/pulverized coal boiler for example, numerical simulations of the combustion process are carried out at three different oxygen-rich conditions of 02 concentration （30%,35%,40%） in the combustion gas （O2/CO2） and conventional air condition by the FLUENT software. The simulation results show： In theoxygen-enriched conditions, the flue gas temperature increases with the growth O2 concentration in the bottom of the furnace and the burner zone, but in the area above the burner, showing an opposite trend, when O2 concentration exceed 35%, the flue gas temperature level has been lower than that in the conventional air condition; The NO concentration increases with the growth of O2 concentration, when the O2 concentration is 40%, NO concentration has exceeded that in the conventional air condition. The growth of NO concentration is hecause of the increasing of O2 concentration in furnace. The export CO2 concentration in three oxygen-rich conditions reached a higher level, which favors CO2 liquefaction separation. In summary, for the BFG/Pulverized Coal Blended Combustion Boiler to use oxygen-rich combustion technology, the initial oxygen concentration should not exceed 35%.

关 键 词：掺烧锅炉 富氧燃烧 NOx 数值模拟 

分 类 号：TK229.6[动力工程及工程热物理—动力机械及工程]