Driving force for particle circulation between two fluidized beds.

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  • ２塔式循環流動層における循環推進力
  • 2トウシキ ジュンカン リュウドウソウ ニ オケル ジュンカン スイシンリョク

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A model for predicting the driving force of particle circulation between two fluidized beds was developed by use of experimental data on a KKI process pilot plant with a capacity of 30 BPSD vacuum residue feed. KKI process is a new process in which vacuum residue is decomposed thermally into lighter oils in a fluidized bed of pulverized iron ores and, at the same time, iron ore particles covered with decomposed petroleum coke are reduced to sponge iron in a reduction furnace. The model shows that the circulation driving force is obtained by the difference of static pressure between the fluidized bed reactor and a cross-pipe which connects the two fluidized beds. Then, it was shown that both the circulation rate and the direction of circulation can be controlled by the change in feed rate of steam to fluidized bed and cross-pipe.

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