Partic. vol. 21 pp. 196-202 (August 2015)
doi: 10.1016/j.partic.2014.09.005

Transportation characteristics of gas–solid two-phase flow in a long-distance pipeline

Xiaoqiang Zhang^a, Dongfeng Zhang^a,*, An Wang^a,b, Yide Geng^a

dfzhang0099@gmail.com

Abstract

In this study, experiments on fly ash conveying were carried out with a home-made long-distance positive-pressure pneumatic conveying system equipped with a high performance electrical capacitance tomography system to observe the transient characteristics of gas–solid two-phase flow. The experimental results indicated that solids throughput increased with increasing solids–gas ratio when the conveying pipeline was not plugged. Moreover, the optimum operating state was determined for the 1000 m long conveying pipeline with a throttle plate of 26 orifices. At this state the solids throughput was about 12.97 t/h. Additionally, the transportation pattern of fly ash gradually changed from sparse–dense flow to partial and plug flows with increasing conveying distance because of the conveying pressure loss. These experimental results provide important reference data for the development of pneumatic conveying technology.

Graphical abstract

Keywords

Pneumatic conveying; Electrical capacitance tomography; Fly ash; Gas–solid two-phase flow; Solid concentration