Pressure drop characteristics of pneumatic dense phase transport in riser
The pressure drop per unit length of pneumatic dense phase transport for pulverized coal with a riser of 20 mm bore stainless steel tube was investigated, and its Zenz-type diagram was obtained.The results revealed that the total pressure drop was mostly attributed to the solids static head and solids friction contribution, and the pressure drop due to gas less than 1% of the total pressure drop might be neglected in this study.Comparing with solids velocity, the solids volume fraction played a leading role for the total pressure gradient.Additionally,the solids friction factor was also investigated, and a correlation was recommended for predicting the solids friction factor, which was consistent with experimental data.