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Erschienen in:
2022 | OriginalPaper | Buchkapitel
43. Experimental Study on Peaking Performance of 145 MW Circulating Fluidized Bed Boiler Unit with Retrofitting for Low-Vacuum Heat Supply
verfasst von : Xuhui Zhang, Zhonghua Zhao, Gui Long Xiong, Fuxing Cui, Xinguang Dong, Qingchuan Zhao, Ke Liu, Haichao Wang, Jinglong Liu
Erschienen in: Clean Coal and Sustainable Energy
Verlag: Springer Singapore
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Abstract
The peaking performance of 145 MW circulating fluidized bed (CFB) boiler unit with retrofitting for low-vacuum heat supply were studied in this article. Peaking depth, peaking rate, tube wall temperature of superheater and reheater and bed temperature were measured. Unit load curve analysis shows that the peak load capacity of the test unit is significantly reduced after low-vacuum heating reform with the minimum output of 41.4%. The load reduction rate of 0.99 MW/min and the load increasing rate of 0.71 MW/min is relatively small because of the large thermal inertia of CFB boiler. The wall temperature of the superheater and reheater of low load and variable load stages could be higher than that of high load stages, which is easy to cause overheating and tube bursting. The results of bed temperature and furnace negative pressure indicate the excellent combustion stability of CFB boiler at low load.