摘要
在600MW锅炉机组水冷壁热力试验的基础上,为找到使壁温发生波动的根本原因,利用有限元分析的方法对低倍率锅炉膜式水冷壁管壁温度分布随传热工况的动态变化进行了分析。分析表明:导致水冷壁管壁温度波动最根本的原因是管内传热恶化;单面受热水冷壁在管内发生传热恶化时其向火侧管内外壁温差随时间的波动较小。
On the basis of the water wall thermodynamic test of a 600 MW boiler unit and through the use of a finite element analytical method an analysis was conducted of the dynamic variation with heat transfer conditions of membrane water wall tube wall temperature distribution of a low circulation ratio boiler. The analysis aims at identifying the underlying basic cause of water wall tube wall temperature fluctuations. The results of the analysis show that the basic cause leading to the fluctuations of the water wall tube wall temperature lies in the deterioration of in tube heat transfer. In the course of a heat transfer deterioration taking place inside the tubes of a single side heated water wall the temperature difference between the fire facing tube inner and outer tube wall surface has a relatively small time dependent fluctuation. However, the water wall peripheral temperature difference suffers a drastic fluctuation triggered by the wall temperature fluctuations of the fire facing outer wall.
出处
《热能动力工程》
CAS
CSCD
北大核心
1999年第6期434-436,共3页
Journal of Engineering for Thermal Energy and Power
