Experimental and numerical study on the flow fields in upper furnace for large scale tangentially fired boilers |
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| Authors: | Yuegui Zhou Tongmo Xu Shien Hui Mingchuan Zhang |
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| Affiliation: | 1. School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 200240, PR China;2. Department of Thermal Energy Engineering, Xi’an Jiao Tong University, Xi’an 710049, PR China;1. School of Power and Mechanical Engineering, Wuhan University, 16 Luojia Hill Road, Wuhan 430072, People''s Republic of China;2. School of Mechanical Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, People''s Republic of China;1. State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology, Wuhan 430074, People’s Republic of China;2. Shenhua Guohua Electric Power Research Institute, Beijing 100025, People’s Republic of China |
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| Abstract: | Experimental and numerical study on the aerodynamic field has been carried out in a tangentially fired boiler model of a 600 MW unit, with emphasis on the flow fields in upper furnace and the gas velocity nonuniformity in horizontal flue gas pass. The results show that there exists residual swirl intensity of nearly 20% at the entry of the plate zone in upper furnace for large scale tangentially fired boilers. And the flow fields are obviously different in the left and right sides of upper furnace and the gas velocity deviation is large in horizontal flue gas pass. Moreover, some new furnace arch structures and arrangements of division platen superheaters are proposed to effectively alleviate gas velocity deviation in horizontal flue gas pass for large scale tangentially fired boilers. The numerical results agree well with the experimental ones, which can give a good insight into the flow characteristics in upper furnace and a clear explanation on the forming mechanism of flue gas velocity and temperature deviation for large scale tangentially fired boilers. |
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