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综合考虑了煤粉燃烧过程涉及到的基本模型,对三菱公司生产的MB-FRR型锅炉(最大连续蒸发量为2 290t/h)的3种燃烧工况(100%、75%、50%)进行了数值模拟,并将模拟得到的炉膛内的速度场和温度场的分布与锅炉试验实测数据进行了分析比较。另外,重点对锅炉负荷降低后的炉内温度场变化进行分析,发现随着负荷的降低,在燃烬风喷射区域等温线会向炉膛中心轴线收缩,炉内的高温区域会有所缩小。提出了优化燃烧的方法,这对于切向燃烧锅炉的设计和运行具有一定的参考价值。
Considering the basic model involved in pulverized coal combustion, the combustion conditions (100%, 75%, 50%) of MB-FRR boiler manufactured by Mitsubishi Company (maximum continuous evaporation of 2 290 t / h) The numerical simulation was carried out. The distribution of velocity field and temperature field in the furnace obtained by the simulation was compared with the experimental data of the boiler test. In addition, the analysis of the furnace temperature field after the boiler load is reduced is found. As the load decreases, the isotherms of the jetting air blast area shrink to the central axis of the furnace, and the high temperature area in the furnace will be reduced. The method of optimizing combustion is put forward, which is of certain reference value for the design and operation of tangential combustion boiler.