Study on the Pressure Drop of Bend in Dense Phase Pneumatic Conveying of Pulverized Coal at High Pressure

Experiments of dense-phase pneumatic conveying of pulverized coal with different mean particle size using nitrogen were carried out in an experimental test facility with the conveying pressure up to 4 MPa. The experimental data of pressure drop across bend was obtained under different conveying condition. Based on Barth's pneumatic conveying theory,an empirical correlation of the additional pressure drop coefficient of bend was proposed taking account of the conveying pressure and properties of pulverized coal. Comparing the pressure drop predicted by the correlation with experimental data,it is found that the calculation results agreed fairly well with the experimental data. Results indicate that,the pressure drop for coarse coal is higher than that of fine coal with the same mass flow rate,and the pressure drop increase with the decrease in superficial velocity in dense-phase pneumatic conveying.