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Open AccessArticle

Optimization of Fluidization State of a Circulating Fluidized Bed Boiler for Economical Operation

by Xuemin Liu 1,2,*, Hairui Yang 2 and Junfu Lyu 2
1
China Special Equipment Inspection and Research Institute, Beijing 100029, China
2
Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Tsinghua University, Beijing 100084, China
*
Author to whom correspondence should be addressed.
Energies 2020, 13(2), 376; https://doi.org/10.3390/en13020376
Received: 5 December 2019 / Revised: 30 December 2019 / Accepted: 7 January 2020 / Published: 13 January 2020
To reduce the auxiliary power consumption and improve the reliability of large-scale circulating fluidized bed (CFB) boilers, we developed energy-saving CFB combustion technology based on the fluidization state re-specification. A calculation model of coal comminution energy consumption was used to analyze the change in comminution energy consumption, and a 1D CFB combustion model was modified to predict the operation parameters under the fluidization state optimization conditions. With a CFB boiler of 480 t/h, the effect of fluidization state optimization on the economical operation was analyzed using the above two models. We found that combustion efficiency presents a nonmonotonic trend with the change in the bed pressure drop and feeding coal size. There are an optimal bed pressure drop and a corresponding feeding coal size distribution, under which the net coal consumption is the lowest. Low bed pressure drop operation achieved by reducing the coal particle size is not beneficial to SO2 and NOx emission control, and the pollutant control cost increases. The effect of fluidization state optimization on the gross cost of power supply can be calculated, and the optimal bed pressure drop can be obtained. View Full-Text
Keywords: CFB boiler; fluidization state optimization; low bed pressure drop; economical operation CFB boiler; fluidization state optimization; low bed pressure drop; economical operation
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MDPI and ACS Style

Liu, X.; Yang, H.; Lyu, J. Optimization of Fluidization State of a Circulating Fluidized Bed Boiler for Economical Operation. Energies 2020, 13, 376.

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