Study of the pressure drop of dense phase gas–solid flow through nozzle

Pressure drops are measured on different nozzles of various pipe sizes in dense phase pulverized coal pneumatic conveying. From the experimental results, we conclude that the effect of the gas phase nozzle pressure drop is negligible when comparing with the solid phase pressure drop in the experimental range. The main influence factors contributing to the nozzle pressure drop are gas and solid mass flow rate, solids loading ratio, and the diameters of the nozzle inlet and outlet. A new model was developed to predict the nozzle pressure drop in dense phase pneumatic conveying of pulverized coal based on the Barth's pneumatic conveying theory. The pressure drop predictions from the model are in good agreement with the experimental values. The model quantified the important influence factors of the nozzle pressure drop.

Different from the flow in pipe, the special geometry of the nozzle makes the gas-solid flow more complex. Based on Barth’s pneumatic conveying theory, a model was developed to predict the nozzle pressure drop in dense phase pneumatic conveying of pulverized coal. The predictions of the pressure drop from the model are in good agreement with the experimental values.Figure optionsDownload as PowerPoint slide