燃尽风配风率对炉膛出口烟气温度的影响  

Effect of OFA Ratio on Outlet Gas Temperature of a Boiler

作　　者：曹乘雀 丁士发[1] 施鸿飞[1] 

机构地区：[1]上海发电设备成套设计研究院,上海200240

出　　处：《动力工程学报》2017年第8期603-607,628,共6页Journal of Chinese Society of Power Engineering

摘　　要：以某1000 MW超超临界双切圆燃煤锅炉为模型,利用Fluent软件对烟煤分级燃烧后炉膛出口烟气温度进行了数值计算和分析,并将计算结果与实际改造后的数据进行比较.结果表明:在一定燃尽风配风率下,该锅炉燃烧烟煤时燃尽风配风率提高会导致燃烧中心升高,使分离燃尽风(SOFA)层以上的烟气冷却段缩短,进而导致炉膛出口烟气温度升高.通过对炉膛出口烟气温度公式中的火焰中心系数M进行修正,计算结果基本能满足实际工程改造的需要,具有一定的工程应用价值.Taking the non-contacting finger seal as an object of study,a conjugate heat transfer model was established using CFX,so as to calculate the temperature distribution of the pad,simulate the thermal deformation with ABAQUS software,and finally to analyze the effects of steam viscosity on the temperature distribution and thermal deformation of the pad.Results show that steam viscosity would cause the generation of friction heat at the coupling surface between pad bottom and highly rotating steam,resulting in non-uniform distribution of temperature in the pad and the increase of local temperature,which would lead to a significant thermal deformation of the non-contacting finger seal.In general,steam viscosity would enhance the thermal deformation of non-contacting finger seals.

关 键 词：分级燃烧 烟气温度 煤粉燃烧 燃尽风配风率 数值计算 

分 类 号：TK222[动力工程及工程热物理—动力机械及工程]