摘要
某电厂600MW超临界W火焰锅炉在投入运行后多次出现水冷壁爆管事故.本研究以两相流模型为基础,结合锅炉机组水动力计算方法和圆管壁温计算模型,对锅炉水冷壁水动力特性、应力及壁温特性进行了计算和分析,研究了超临界压力变压运行直流锅炉炉膛水冷壁超温爆管的原因.研究结果表明,锅炉炉内温度场分布不均匀,使水冷壁管受热不均,水冷壁管的膨胀量不一致并产生较大的应力,引起水冷壁管变形,水冷壁管的界限强度下降,导致锅炉水冷壁爆管.对此提出了对锅炉进行燃烧调整和对水冷壁下集箱等限制受热面膨胀的部位进行改进的措施,实施后效果良好.
Tube explosion accidents happened time and again in 600 MW W-flame supercritical boiler＇s water wall after operation in one plant.Based on the two phase flow model,using the boiler hydrodynamic calculation method and the calculation model of tube wall temperature,the hydrodynamic and the stress was calculated.The reasons of the water wall tube explosion of the supercriticial concurrent boiler were analyzed.The results showed improper adjustment of boiler combustion gave rise to temperature deformation and uneven heating of water wall tube.Asynchronous swell increment led to the water wall tube deformation and declined of boundary strength,that caused the tube explosion.With this study,a combustion adjustment and improvement measures for restricted expansion heating surface of water wall lower header of boiler was put forwarded and the implementation tube explosion accident did not happen again.
出处
《长沙理工大学学报（自然科学版）》
CAS
2013年第4期86-92,共7页
Journal of Changsha University of Science and Technology:Natural Science
基金
湖南省教育厅科学研究基金重点资助项目(10A004)
关键词
锅炉
W型火焰
水冷壁
爆管
分析
boiler
W-flame
water wall
tube explosion
analysis
