1000MW超超临界双切圆锅炉烟温偏差的数值模拟

Numerical simulation of flue gas temperature deviation in 1000MW double tangential ultra-supercritical boiler

本文以1000MW超超临界双切圆锅炉为研究对象,通过数值模拟研究了炉膛内的燃烧、流场分布以及分隔屏间距对烟温偏差的影响。计算结果表明炉内温度场分布合理,气流形成较为完整的椭圆形切圆;炉膛出口烟气存在旋转残余,导致各屏间烟气温度与速度分布不均,靠近水冷壁区域烟气温度及速度明显低于炉膛中心侧;分隔屏可以促进烟气的均匀分布,因此调整分隔屏间距可以调节烟气量在分隔屏间的分配,有利于控制烟温偏差。

The paper takes 1000MW ultra-supercritical boiler as research object, combustion and flow inside furnace and the effect of dividing panel spacing on the gas temperature deviation is stud- led through numerical simulation. The results show that the temperature distribution is reasonable and airflow form relatively complete elliptic tangential. The residual rotation of gas in furnace exit, which leads to the temperature and velocity distribution between panel, Temperature and velocity clearly lower than the parameter in center of the boiler. Actually the division panel can contribute to the uniform of gas velocity; panel spacing can be adjusted by the gas in the allocation of separating screen that is helpful to control the gas temperature deviation.