COMBUSTION MODEL FOR A CFB BOILER WITH CONSIDERATION OF POST-COMBUSTION IN THE CYCLONE
Severe post combustion in the cyclone of CFB boilers could destroy heat absorbing balance among the heating surfaces and cause overheating problem for reheaters and superheaters. However, post combustion in the cyclone is rarely considered in the design phase of a CFB boiler. Based on our previous experiment results, group combustion model is used in this study to estimate the combustion of particles in the cyclone. It is found that the combustion of particles in the cyclone did not contribute as much as we anticipated to the temperature augment in the cyclone because of great oxygen diffusion resistance in near-wall particle layer. Post combustion model in the cyclone is then added into a one-dimensional combustion model of CFB boiler, in which the gas-solid flow, reaction, and heat absorption at different vertical locations in a CFB boiler can be well predicted with the knowledge of operation parameters. The new model was used to estimate the influence of some operation parameters on the post combustion in the cyclone and heat releasing fraction in the cyclone. The prediction results are very good.
CFB boiler post combustion cyclone combustion model
S.H.Li H.R.Yang H.Zhang Y.X.Wu J.F.Lu G.X.Yue
Key Laboratory for Thermal Science and Power Engineering of Ministry of EducationDepartment of Thermal Engineering, Tsinghua University, Beijing, 100084, China
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
824-828
2009-05-18（万方平台首次上网日期，不代表论文的发表时间）