空气分级对旋风燃烧液态排渣及NOx排放的影响  

Influence of Staged Air on Liquid Slagging and NOx Reduction of Cyclone Combustion

作　　者：张向宇[1] 白文刚[1] 贾子秀 周广钦 陆续[1] 徐宏杰[1] Zhang Xiangyu;Bai Wengang;Jia Zixiu;Zhou Guangqin;Lu Xu;Xu Hongjie(National Engineering Research Center of Clean Coal Combustion,Xi’an Thermal Power Research Institute Co.,LTD,Xi’an 710032,China)

机构地区：[1]西安热工研究院有限公司电站锅炉煤清洁燃烧国家工程研究中心,西安710032

出　　处：《燃烧科学与技术》2020年第4期376-381,共6页Journal of Combustion Science and Technology

基　　金：陕西省自然科学基础研究计划资助项目(2017JQ5124);中国华能集团公司科学技术资助项目(ZD-19-HKR01)。

摘　　要：为了进一步论证在旋风炉中采用空气分级低氮燃烧技术的可行性,建立了旋风燃烧液态排渣模型和NOx排放半经验公式,并在一台中试旋风炉上开展了实验研究,定量分析了空气分级对准东煤旋风燃烧时液态排渣、NOx排放和燃尽性的影响.实验数据表明,针对不同准东煤种,为兼顾稳定液态排渣和降低氮氧化物排放,可根据容积热负荷、捕渣率和灰临界温度确定合适的空气配比方式.燃用准东天池煤时,最佳的主燃区过量空气系数为0.9,与空气未分级相比,NOx排放可降低20%,但未完全燃烧热损失会增加0.32%.本研究将为旋风炉的设计和运行提供重要参考.The feasibility of staged air combustion in the cyclone furnace needs to be further demonstrated.In this paper,the liquid slagging model of cyclone combustion was built and the semi-empirical formulas for NOx emission were derived,and the experiments were conducted on a pilot cyclone furnace,to research the influences of staged air on liquid slagging,NOx emission and coal burnout of cyclone combustion of Zhundong coal.The results indicate that,in order to stabilize liquid slagging and reduce NOx emission,the appropriate air mixing mode can be determined by volume heat load,slag capture rate and ash critical temperature for different Zhundong coals.The optimal excess air coefficient for combustion zone is 0.9 when burning Tianchi coal,the NOx emission can be reduced by more than 20%,while the heat loss due to incomplete combustion will increase by 0.32%.This study will provide important reference for the design and operation of cyclone furnace.

关 键 词：准东煤 旋风燃烧 空气分级 NOx 液态排渣 

分 类 号：TK227.1[动力工程及工程热物理—动力机械及工程]