1984 Volume 10 Issue 4 Pages 483-488
The three-phase fluidized bed reactor is generally recognized to be most realistically applicable to a commercial-scale coal liquefaction system. However, problems of solid sedimentation caused by low linear velocities of fluids are involved in the laboratory-scale reactor. To prevent solid sedimentation, a laboratory-scale C. S. T. reactor having hydrodynamic behavior similar to that of a large-scale three-phase fluidized bed reactor was designed and tested.
Characteristics of the reactor and their effects on coal liquefaction were examined and the following results were obtained.
1) The reactor was a complete mixing type reactor. The dispersed gas volume and overall absorption coefficient KGa were found to increase with increasing rotational speed of the stirrer.
2) However, it was found that the volume of dispersed hydrogen and the value of KGa did not affect the coal liquefaction reaction under the given conditions. This implies that the amount of hydrogen supplied to coal through a gas-liquid interface with an area corresponding to the cross-sectional area of the reactor was enough for coal liquefaction under the given conditions or that a sufficient amount of hydrogen is provided by the hydrogen donor components of the solvent.