电站锅炉中煤粉燃烧的数值模拟与操作参数的优化(英文)

Numerical Investigation of Pulverized Coal Combustion and Optimization of Operating Mode in Power Station Boiler

模拟了四角切圆锅炉中煤粉的燃烧过程 ,考虑了三种不同工况 .其一是改变二次风的分配方式 (包括正宝塔、腰鼓以及均等配风 ) ;其二是在水冷壁敷设卫燃带 ;最后是改变燃烧器的上下角度与燃烧器的排列顺序 .计算结果表明 :1#、3#角煤粉的着火距离较 2 #、4 #角长 ,这一结论与生产实践中所观察到的现象一致 ;与均等配风相比较 ,正宝塔与腰鼓配风有利于煤粉的着火 ,但不利于提高屏入口处的烟气温度 ;炉膛内敷设卫燃带显著提高烟气的温度 .

The combusting process of pulverized coal was simulated on a power furnace fired tangentially at four corners. Three different operating conditions were considered. One was changing secondary air distribution including in pagoda, waist drum and uniform type, one was applying a refractory faced zone for covering the wall cooled by water and another was adjusting elevation angle of burners and the order of the burner levels. The calculated results show that the igniting distances of pulverized coal at the 1st and 3rd corner are longer than that at the 2nd and 4th corner, which is in good agreement with the phenomenon observed in industrial furnace. The pagoda and waistdrum type air distribution is advantageous to the ignition of pulverized coal and not suitable to improve the flue temperature at the inlet of screen type heat exchanger, compared with uniform type air distribution. The flue temperature increases greatly in the furnace with refractory faced zone.