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Experimental and CFD Simulation Studies on Bell-Type Air Nozzles of CFB Boilers

State Key Laboratory of Multiphase Flow in Power Engineering, School of Energy and Power Engineering, Xi’an Jiaotong University, Xi’an 710049, China
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Appl. Sci. 2019, 9(18), 3805; https://doi.org/10.3390/app9183805
Received: 7 August 2019 / Revised: 31 August 2019 / Accepted: 6 September 2019 / Published: 11 September 2019
(This article belongs to the Section Applied Industrial Technologies)
In this paper, a new bell-type air nozzle, which overcomes the structural defects of traditional bell-type air nozzles, is proposed and validated by cold test and numerical simulation. The pressure drop characteristic of the new bell-type air nozzle is measured. Furthermore, the causes of cover outlet abrasion and blockage, inner tube fracture, and irregular resistance change in traditional bell-type air nozzles applied in circulating fluidized bed (CFB) boilers are analyzed. Then, the performance of the new bell-type air nozzle is evaluated in a real CFB boiler, which is operated under regular working conditions. The results show that the new bell-type air nozzle has stronger anti-wear ability, excellent resistance characteristics, longer service life, and easier maintenance. View Full-Text
Keywords: CFB boiler; bell-type air nozzle; pressure drop; CFD; design; retrofit CFB boiler; bell-type air nozzle; pressure drop; CFD; design; retrofit
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Huang, Z.; Deng, L.; Che, D. Experimental and CFD Simulation Studies on Bell-Type Air Nozzles of CFB Boilers. Appl. Sci. 2019, 9, 3805.

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