The incipient condition of hang-up for three Geldart-D powders has been experimentally studied in a
21 m long standpipe hopper system. Experimental results show that the pressure gradient for hang-up to occur is
ind...The incipient condition of hang-up for three Geldart-D powders has been experimentally studied in a
21 m long standpipe hopper system. Experimental results show that the pressure gradient for hang-up to occur is
independent of the materials height in the hopper and the diameter of orifice and equals to (dpw/dl)s, which can be
predicted by Eq. (7). While the corresponding gas velocity in the standpipe equals to the incipient fluidized velocity
of particles at the high pressure and can be predicted by Kwauk's equation.展开更多
In this paper, a model is proposed for the prediction of the width of arching in hoppers resulted from sudden changes in solid feed rates. Such changes in solid feed rate usually come from the collision on the surface...In this paper, a model is proposed for the prediction of the width of arching in hoppers resulted from sudden changes in solid feed rates. Such changes in solid feed rate usually come from the collision on the surface of the moving-bed in the standpipe. The model also takes into accountthe effect of the powder height in the standpipe of the hopper. The model proves to be adaptable for predicting operational conditions to avoid vxching by keeping constant powder height in the main standpipe wlth interstitial gas flow.展开更多
文摘The incipient condition of hang-up for three Geldart-D powders has been experimentally studied in a
21 m long standpipe hopper system. Experimental results show that the pressure gradient for hang-up to occur is
independent of the materials height in the hopper and the diameter of orifice and equals to (dpw/dl)s, which can be
predicted by Eq. (7). While the corresponding gas velocity in the standpipe equals to the incipient fluidized velocity
of particles at the high pressure and can be predicted by Kwauk's equation.
基金Supported by the China Petrochemical Corporation.
文摘In this paper, a model is proposed for the prediction of the width of arching in hoppers resulted from sudden changes in solid feed rates. Such changes in solid feed rate usually come from the collision on the surface of the moving-bed in the standpipe. The model also takes into accountthe effect of the powder height in the standpipe of the hopper. The model proves to be adaptable for predicting operational conditions to avoid vxching by keeping constant powder height in the main standpipe wlth interstitial gas flow.
