Abstract
The work presented here analyses the different aspects of the design of tuyere plate distributors commonly used in fluidized bed reactors. The design of these tuyeres depends essentially on the pressure drop of the grid. However, various methods proposed in the literature give unreliable results for the determination of gas pressure drop across the tuyeres under industrial operation of fluidized bed reactors. This study is based on the comparison of experimental and theoretical pressure drops obtained on a pilot unit using tuyeres of different types. The aim of this comparison is to identify the main source of resistance to the gas flow. Experimental results are discussed and compared with values obtained from various models. The results obtained show that the main resistance is caused by the contraction of the gas at the exit nozzles of the tuyere. A numerical modelling approach is proposed and applied to the example of the tuyeres with four horizontal holes. This new approach shows that there is some limitation in the use of CFD programs for velocities higher than 60 m s −1 at the gas exit level.
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