This study has experimentally investigated fluidized powder conveying in a horizontal rectangular channel when the powder head at the powder discharge vessel and fluidizing velocity at the bottom of the discharge vessel and the horizontal channel were varied. The powder used was glass beads of the Geldart B particle, with mean particle diameter of 118m, the particle density of 2623kg/m 3 and the minimum fluidizing velocity of 12.3mm/s. As the result, steady powder conveying achieved in case of the reduced powder head in the powder discharge vessel. It is also necessary to supply the air at the bottom of the powder discharge vessel, and to give to greater than the minimum fluidizing velocity at the bottom of a horizontal channel. The profile of mass flow rate and solid loading ratio against fluidizing velocity to the bottom of the powder discharge vessel and a horizontal channel revealed the similar tendency when the powder head was changed. It was clarified that when the powder head was lowered, the total pressure drop decreased, the mass flow rate and the solid loading ratio also decreased, and then the performance of the pneumatic conveying equipment was greatly affected. In addition, it was confirmed that high dense pneumatic conveying could be realized even if the powder head was changed within the range of the present experiment. Moreover, the flow pattern in the horizontal channel during steady conveying showed the ripple flow, and the bubble flow was generated into the powder layer as the fluidizing velocity at the bottom of the channel increased. It is also inferred that the part of the pressure energy of the powder bed in the powder discharge vessel became the driving force for the horizontal conveying of the powder.
This study has experimentally investigated dense phase pneumatic conveying in a horizontal rectangular channel by fluidizing air. The powder was glass beads of the Geldart B particle, with mean particle diameter of 118m, particle density of 2623kg/m 3 and minimum fluidizing velocity of 12.3mm/s. Fluidizing velocities to the bottoms of powder discharge vessel and horizontal channel changed against minimum fluidizing velocity. The result showed that steady powder conveying achieved when height and pressure of powder bed at discharge vessel maintained the constant value. Mass flow rate of powder increased rapidly and reached the constant when fluidizing velocity at the bottom of a horizontal channel exceeded minimum fluidizing velocity. Solid loading ratio also increased with increasing fluidizing velocity, and took a maximum value. We found that powder conveying by fluidizing air realize high dense pneumatic transportation. In addition, we revealed that air pressures at powder discharge vessel and horizontal channel greatly influenced to mass flow rate.
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