Study on Dynamic Characteristics of Residual Char of CFB Boiler Based on CPFD Method

Xin Shen, Li Jia, Yanlin Wang, Baihe Guo, Haodong Fan, Xiaolei Qiao, Man Zhang and Yan Jin
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Xin Shen: College of Electrical and Power Engineering, Taiyuan University of Technology, Taiyuan 030024, China
Li Jia: College of Electrical and Power Engineering, Taiyuan University of Technology, Taiyuan 030024, China
Yanlin Wang: College of Electrical and Power Engineering, Taiyuan University of Technology, Taiyuan 030024, China
Baihe Guo: College of Electrical and Power Engineering, Taiyuan University of Technology, Taiyuan 030024, China
Haodong Fan: College of Electrical and Power Engineering, Taiyuan University of Technology, Taiyuan 030024, China
Xiaolei Qiao: College of Electrical and Power Engineering, Taiyuan University of Technology, Taiyuan 030024, China
Man Zhang: State Key Lab of Power Systems, Tsinghua University, Beijing 100083, China
Yan Jin: College of Electrical and Power Engineering, Taiyuan University of Technology, Taiyuan 030024, China

Energies, 2020, vol. 13, issue 22, 1-24

Abstract: When the load of Circulating Fluidized Bed (CFB) boiler changes dynamically, the accumulation and consumption of residual char causes a large inertia and hysteresis in the boiler combustion system. Therefore, accurate estimation of the residual char in the boiler is of great significance to the control system and improve the combustion efficiency. Based on the Computational Particles Fluid Dynamics (CPFD) method, a numerical simulation of the variable load process of CFB boiler was carried out, and the dynamic changes of the residual char inventory were analyzed by combining the coal feed, ash discharge, and furnace calorific value. The results showed that after CFB boiler reached stable operation, the residual char fluctuated from 11,000 kg to 16,000 kg, accounting for about 3.7% of the total bed material, and the residual char was in a dynamic balance. During the load-up phase, the average residual char was 17,500 kg, and during the load-down phase, the average residual char was 15,000 kg. In the process of load dynamic change, reasonable residual char stock can ensure the boiler load from one steady state to another steady state rapid transition.

Keywords: CPFD method; CFB boiler; residual char; load change; dynamic analysis (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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