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

• Published in: Particuology 2015-08, Vol.21 (4), p.196-202
• Main Authors: Zhang, Xiaoqiang, Zhang, Dongfeng, Wang, An, Geng, Yide
• Format: Article
• Language: English
• Subjects: Electrical capacitance tomography; Fly ash; Gas–solid two-phase flow; Pneumatic conveying; Solid concentration; 气-固两相流; 气力输送系统; 气固两相流; 电容层析成像系统; 输送特性; 输送管道; 运行状态; 长输管道
• ISSN: 1674-2001; 2210-4291
• DOI: 10.1016/j.partic.2014.09.005

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 experimen- tal 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.