Influence of Pressure on Fundamental Characteristics in Gas Fluidized Beds of Coarse Particle
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Wei Nie
Abstract
Experiments were conducted to investigate fluidization fundamentals of coarse particle using nitrogen as the fluidizing gas at high pressure. The particle under study was falling in Geldart’s group B/D. A 60-mm-dia. cylindrical Perspex model, a two-dimensional jetting fluidized bed, a 200-mm-semicircular jetting fluidized bed and a 200-mm-dia. cylindrical bed were used in the experiments. The fundamentals of high pressure fluidization examined in this study include minimum fluidization velocity and bed expansion. Empirical correlations were developed for determining minimum fluidization velocity and bed expansion. With the same excess fluidizing-gas velocity, bed expansion generally increases with the operating pressure, but the influence of pressure on bed expansion becomes weaker at higher pressure.
Acknowledgements
This work was financially supported by the National Natural Science Foundation of China (NO. 21606250) and Strategic Priority Research Program of the Chinese Academy of Sciences (XDA07050100). The high-pressure experiment required significant manpower, material and financial resources. The authors are grateful to Pengfei Liu, Shunxuan Hu, and all of the workers in the coal gasification pilot-scale center, Institute of Coal Chemistry, Chinese Academy of Sciences.
Nomenclature
Archimedes number
Particle diameter, mm
Bed height, mm
Bed height at minimum fluidization condition, mm
Reynolds number at minimum fluidization
Pressure, MPa
Superficial gas velocity, m/s
Minimum fluidization velocity, m/s
Particle density, kg/m3
Gas density, kg/m3
Viscosity of gas, kg/m.s
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