Effect of sudden increase of solid feed rate on the arching in hoppers connected to a moving-bed standpipe with interstitial gas flow

In this paper, a model is proposed for the prediction of the width of archi ng in hoppers resulted from sudden changes in solid feed rates. Such change s in solid feed rate usually come from the collision on the surface of the moving-bed in the standpipe. The model also takes into account the effect o f the powder height in the standpipe of the hopper. The model proves to be adaptable for predicting operational conditions to avoid arching by keeping constant powder height in the main standpipe with interstitial gas flow.