摘要
对一台锅炉中其分配集箱带弯头入口的顶棚管过热器受热面管流量分配做了较详细的数值模拟研究。研究发现,进口弯头对分配集箱中的流量分配有较大的影响,弯头上不同区域的管产生不同的流量偏差,布置在弯头外侧的管流量偏大,弯头内侧的管流量偏小,并且弯头出口附近直管集箱上的管中流量也会受弯头的影响。该区域受热面管中流量偏小的管产生爆裂后,其附近流量偏大的管中流量会减小,出现连锁爆裂。最后,根据计算分析,得到产生流量偏差的原因和特点,提出消除流量偏差和解决爆管的措施,并给予了计算论证。
A detailed numerical simulation study was conducted of the flow distribution in the heating-surface tubes of a boiler roof superheater featuring a distribution header with a bent inlet. The inlet elbow has a relatively great impact on the flow distribution in the distribution header with different flow deviations occurring in tubes at different zones of the elbow. The flow rate in the tubes located at the outer side of the elbow is excessively great while that at the inner side of the elbow is excessively small. Moreover, the flow rate in the tubes of a straight-tube header adjacent to the elbow outlet will also be affected by the elbow. After a tube explosion caused by the excessively small flow rate in heating-surface tubes located in the above zone the flow rate in the nearby tubes with excessively great flow rates will be drastically reduced, thus triggering chain explosions of tubes. Finally, on the basis of calculations and analyses the causes and specific features of the flow deviations were identified and verified, and relevant measures adopted for eliminating flow deviations and solving the problem of tube explosions.
出处
《热能动力工程》
EI
CAS
CSCD
北大核心
2003年第4期343-348,共6页
Journal of Engineering for Thermal Energy and Power
关键词
锅炉
过热器
爆管
数值模拟
Computer simulation
Flow of fluids
Heating
Roofs
Superheaters
Tubes (components)
