HEAT TRANSFER COEFFICIENT DISTRIBUTION IN THE FURNACE OF A 300MWe CFB BOILER
Properly understanding and calculating the distributions of heat flux and heat transfer coefficient (α) in the furnace is important in designing a circulating fluidized bed (CFB) boiler, especially with supercritical parameters. Experimental study on the heat transfer in a commercial 300MWe CFB boiler was conducted. The αfrom the bed to the water wall was measured by the finite element method (FEM), at five different heights. The influence of suspension density and bed temperature on αwas analyzed. It was found that the pressure difference between the inlet and exit of the three cyclones, and the chamber pressure of the corresponding loop seal were not equal. The results indicated the suspension solid density was non-uniform in the cross section at a certain height. Consequently, the distributions of heat flux and α in the horizontal plane in the furnace was non-uniform. The furnace can divided into three sections according to the arrangement of the platen superheaters hanging in the upper CFB furnace. In each section, the heat flux near the center showed increasing trend.
CFB boiler heat transfer heat fluz heat transfer coefficient furnace
P.Zhang J.F.Lu H.R.Yang J.S.Zhang H.Zhang G.X.Yue
Key Laboratory for Thermal Science and Power Engineering of Ministry of Education,Department of Ther Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Department of The
国际会议
第20届国际流化床燃烧会议(20th International Conference on Fluidized Bed Combustion)
西安
英文
167-171
2009-05-18（万方平台首次上网日期，不代表论文的发表时间）