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ע⣺ՓڡЇ늙ČW2001,2112:100-104l
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K1 2 ᯿ɷ2
1|AWhƌWčWԺϺ2000512㽭Wܹо310027

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A theoretical wall-to-suspension heat transfer model for square-shaped cyclone separator

Yaxin Su1 Zhongyang Luo2 Kefa Cen2
( 1: College of Environmental Science and Engineering, Donghua University, Shanghai, 200051; 2: Institute for Thermal Power Engineering, Zhejiang University, Hangzhou, 310027 )

Abstract: Experimental test on the suspension-to-wall heat transfer in a water/stream-cooled square-shaped cyclone separator, which was developed for large compact CFB boilers was conducted and the results were analyzed. Based on the experiment, a theoretical study on the heat transfer model was carried out and a model to calculate the mean heat transfer coefficient was established. The heat transfer model of this paper consists 4 components: gas convection, particle unsteady heat conduction, particle radiation and flue-gas radiation. The particle unsteady heat conduction includes heat conduction during the particle-wall elastic impact and the transient heat conduction of the collected particles when they fall down along the wall surface. The surface-averaged heat transfer coefficient calculated by this model showed good agreement with the experimental data. Model results showed the particle concentration near the wall and the impact velocity of particle-to-wall had much effect on the heat transfer, while these two parameters can not be related to the inlet particle concentration and velocity.
Keywords: square-shaped cyclone separator; heat transfer model

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