旋流对冲锅炉低NOx燃烧优化数值模拟  

Numerical Simulation of Swirling Boiler with Opposed Burners and Optimization of Low NOx Combustion

作　　者：檀哲林 Tan Zhelin(School of Energy and Power Engineering,University of Shanghai for Science and Technology,Shanghai 200093,China)

机构地区：[1]上海理工大学能源与动力工程学院,上海200093

出　　处：《山东化工》2020年第18期232-237,共6页Shandong Chemical Industry

基　　金：国家自然科学基金重点课题(51736007)。

摘　　要：针对一台旋流对冲锅炉在300MW负荷下炉内低氮燃烧问题,建立三维物理模型,采用Fluent软件进行数值模拟。研究其在不同一次风煤比、燃尽风率的情况下,炉膛内部流动、燃烧以及NOx的生成情况。模拟结果表明:风煤比过小或者过大时,燃烧情况较差,NOx浓度整体呈减小趋势,最佳风煤比为1.9;随着燃尽风率的增大,炉膛出口飞灰含碳量和CO浓度增加,NOx浓度先降低后升高,最佳燃尽风率为35%。A three-dimensional physical model was established for a low-nitrogen combustion problem in a swirling boiler with a 300MW load,and the fluent software was used for numerical simulation.The flow,combustion and NOx formation in the furnace were studied under different conditions of ratio of air to coal and burnout rate.The simulation results show that when the ratio of air to coal is too small or too large,the combustion condition is poor,and the NOx concentration decreases.The optimum ratio of air to coal is 1.9.With the increase of burnout rate,the fly ash carbon content at the exit of the furnace and CO concentration increase,the NOx concentration decreases first and then increases,and the optimal burnout rate is 35%.

关 键 词：旋流对冲炉 一次风煤比 燃尽风率 NO x减排优化 数值模拟 

分 类 号：TK124[动力工程及工程热物理—工程热物理] X701[动力工程及工程热物理—热能工程]