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Abstract This study focuses on the influence of key factors, such as solids circulation rate and the aeration rate, on the solids height in the standpipe of the recycling valve. A one-dimensional hydrodynamic model is developed based on the hydrodynamics of the gas-solid flow in the loop-seal and the standpipe. The predicted heights agree well with experimental data. Redistribution of the aeration ratio in the standpipe and the discharge chamber increases the solids height in the standpipe to adapt to increasing solids circulation rates and to balance the pressures in the circuit. The results also indicate that if the solids circulation rate is over a critical value, the recycling valve will lose its self-adaptability and the solids will rise out of the standpipe and into the cyclone separator. The self-adaptability can be enhanced and the stable operation range of the recycling valve can be extended by properly increasing the aeration rate. This model is useful for the design and optimization of circulating fluidized bed recycling valves with relatively short standpipes.
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| Keywords
circulating fluidized bed
recycling valve
one-dimensional hydrodynamic model
standpipe solids height
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Issue Date: 15 February 2014
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