高炉煤粉燃烧氮氧化物减排控制仿真  

SIMULATION FOR EMISSION REDUCTION AND CONTROL OF NITROGEN OXIDE FROM BLAST FURNACE COAL POWDER COMBUSTION

作　　者：韩思奇 王秀英 邵欣 王兴武 HAN Si-qi;WANG Xiu-ying;SHAO Xin;WANG Xing-wu(Intelligent Manufacturing College,Tianjin Sino-German University of Applied Sciences,Tianjin 300350)

机构地区：[1]天津中德应用技术大学智能制造学院,天津300350

出　　处：《环境工程》2018年第12期188-193,共6页Environmental Engineering

基　　金：2016年天津市自然科学基金项目(17JCYBJC16800);国家重大科学仪器设备开发专项(2012YQ06016501);天津中德应用技术大学科技培育重点项目(zdkt2016-001);天津中德应用技术大学自制实验实训设备重点项目(ZDZY2016-03C)

摘　　要：如何预测并降低煤粉燃烧产生的氮氧化物排放量是治理大气污染问题的技术难点,当前存在的困难是燃烧场中各种操作条件的微小改动都会对NO_x的排放监测造成干扰。为了能够准确分析NO_x生成特性,制定有效的NO_x减排措施,建立了基于高炉燃烧场内的煤粉燃烧及NO_x生成的物理模型,并针对煤粉燃烧特点以及NO_x生成机理进行深入研究。仿真结果表明:随着煤粉粒径的减小,NO_x排放浓度有较大幅度的下降;通过降低炉膛温度及过量空气系数,其NO_x的排放量有所减少,但同时煤粉的燃烧效率也随之下降;提高挥发分含量后由于NO_x的还原作用逐渐加强导致高炉出口NO_x的浓度有所下降。通过仿真模拟可以比较准确地预测NO_x的生成特性,为工业应用中NO_x的排放量的控制提供理论依据。Predicting and reducing the emission of nitrogen oxide from coal powder combustion is a technology challenge in air pollution control, and the current difficulty is that even a tiny change of operating parameters in combustion field may affect the monitoring of NO_x emission. In order to analyze the formation characteristics of NO_x accurately and formulate effective NO_x emission reduction measures, a physical model based on coal powder combustion and NO_x formation in blast furnace combustion field was developed, and an in-depth study was carried out on the coal powder combustion features and NO_x formation mechanism. The simulation results indicated that as the particle diameter of coal powder decreased, the emission concentration of NO_x decreased significantly; the emission of NO_x decreased when the furnace box temperature and excess air coefficient were decreased, but the combustion efficiency of coal powder also decreased; and after increasing the volatile matter content, the concentration of NO_x at blast furnace outlet decreased for the reduction effect of NO_x was increased gradually. The simulation could accurately predict the formation characteristics of NO_x and provide a theoretical foundation for control of emission reduction of NO_x in industrial application.

关 键 词：煤粉燃烧 数值模拟 生成特性 氮氧化物 燃烧效率 

分 类 号：X701[环境科学与工程—环境工程]