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.
出处
《动力工程学报》
CAS
CSCD
北大核心
2017年第8期603-607,628,共6页
Journal of Chinese Society of Power Engineering
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
non-contacting
finger seal
steam viscosity
temperature distribution
thermal deformation
