300MW锅炉卫燃带改造对燃烧影响的数值模拟

针对某电厂一期2×300 MW煤粉锅炉煤质变差引起的过、再热蒸汽温度低、炉内燃烧不稳定及燃尽率低等问题,提出了在主燃区下部区域水冷壁敷设一定面积的卫燃带的改造方案。用Fluent 6.3数值模拟软件对改造前后的燃烧工况进行了对比,分析了卫燃带的布置方式对炉膛温度场分布、焦炭的燃尽率和结渣性能的影响,依此设计出比较理想的布置方式。研究表明合理的卫燃带布置方式有助于解决锅炉目前存在的问题。

Numerical Simulation of the Effects of Refractory Belt Retrofit on the Combustion in the 300-MW Boilers

Regarding the problems of low reheat steam temperature, unstable combustion and low burnout degree due to the coal quality deterioration in the two 300-MW boilers of a power plant phase I project, the retrofit plan of laying some refractory belt on the water wall located at the lower part of the main combustion zone is proposed. The combustion conditions before and after the retrofit are simulated with the aid of the Fluent 6.3 software. In this way the effects of refractory belt arrangement on furnace temperature distribution, charcoal burnout degree and slagging performance are analyzed. Based on the analysis, a more desirable arrangement is designed. The study concludes that reasonable refractory belt arrangement is helpful to solve the current problems existing in the boilers.