Normal and steady bed temperature provides a basis for the stabilization and safe operation of the circulating fluidized bed boiler (CFBB) unit. Because the bed temperature is affected by many operating factors, it often fluctuates unexpectedly. The bed temperature auto-control system seldom could be put into service during the operation of large capacity CFBB unit. On the basis of operation data of a commercial 450t/h CFBB, which is the first biggest CFBB made in China, the authors systematically analyze the main factors which influence the changes of bed temperature, such as fuel supply rate, air supply rate, oxygen concentration, dense zone height and the unit load et al. The record of the operation data show that the lag of the bed temperature is common phenomenon while fuel supply is changed, and the lag time varies with the fuel supply time, fuel supply operating mode and fuel supply rate; Coal quality and its grain diameter spectrum also have notable influence on bed temperature; Primary air rate has different influences on bed temperature at different operating conditions, and its adjustment range on bed temperature is limited while it is used to bed temperature control; The change of oxygen concentration can reflect combustion conditions in the furnace; The change of dense zone height will result in the change of bed temperature, so the adjustment of fluidization air rate is necessary; Bed temperature is one of the main factors which lead to the change of boiler load. At last, regulating rules on bed temperature control are analyzed and summarized. The conclusions can provide references for the design of control system and safe operation of CFBB unit.
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18th International Conference on Fluidized Bed Combustion
May 22–25, 2005
Toronto, Ontario, Canada
Conference Sponsors:
- Advanced Energy Systems
ISBN:
0-7918-4183-9
PROCEEDINGS PAPER
Analysis on the Bed Temperature Characteristics of 450t/h Circulating Fluidized Bed Boiler
Jian-Qiang Gao,
Jian-Qiang Gao
North China Electric Power University, Baoding, P. R. China
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Chao-Bo Du,
Chao-Bo Du
North China Electric Power University, Baoding, P. R. China
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Yin-Song Wang
Yin-Song Wang
North China Electric Power University, Baoding, P. R. China
Search for other works by this author on:
Jian-Qiang Gao
North China Electric Power University, Baoding, P. R. China
Chao-Bo Du
North China Electric Power University, Baoding, P. R. China
Yin-Song Wang
North China Electric Power University, Baoding, P. R. China
Paper No:
FBC2005-78087, pp. 801-804; 4 pages
Published Online:
October 7, 2008
Citation
Gao, J, Du, C, & Wang, Y. "Analysis on the Bed Temperature Characteristics of 450t/h Circulating Fluidized Bed Boiler." Proceedings of the 18th International Conference on Fluidized Bed Combustion. 18th International Conference on Fluidized Bed Combustion. Toronto, Ontario, Canada. May 22–25, 2005. pp. 801-804. ASME. https://doi.org/10.1115/FBC2005-78087
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