Transportation characteristics of gas–solid two-phase flow in a long-distance pipeline--颗粒学报PARTICUOLOGY

Zhang, X., Zhang, D., Wang, A., & Geng, Y. (2015). Transportation characteristics of gas–solid two-phase flow in a long-distance pipeline. Particuology, 21, 196-202. https://doi.org/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

a College of Mining Engineering, Taiyuan University of Technology, Taiyuan 030024, China
b China National Coal Group Corporation, Beijing 100120, China

10.1016/j.partic.2014.09.005

Volume 21, August 2015, Pages 196-202

Received 8 August 2014, Revised 21 September 2014, Accepted 27 September 2014, Available online 22 January 2015, Version of Record 6 June 2015.

E-mail: dfzhang0099@gmail.com

Highlights

• A home-made positive-pressure pneumatic conveying system was used to investigate two-phase flow.

• A long distance experimental system of the positive-pressure pneumatic conveying was carried out.

• ECT was equipped to observe transient characteristics within the conveying pipeline.

• The delivery state of solids in the pipeline was dominated by pulsed movement.

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

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