STUDY OF DENSE PHASE COAL TRANSPORT IN PLUGS: QUARTERLY REPORT, JULY-SEPTEMBER 1988

During the past quarter some interesting observations were made on the form on the coal plug as it moved through the one inch pipe. It appears as if a stagnant layer of coal occupies the lower third to half of the pipe while the upper section transports the coal. The moving plug thus has a half cylinder shape. It is conjectured that for layer pipes this type of plug shape would be similar or even more extreme since the gravity effects are greater. A mathematical analysis was performed on the type of plug movement noting that the upper section of the plug slides on the wall surface while the lower has a powder-powder shear stress. The analytical results obtained agreed with the pressure drop measurements carried out on these plugs. Fundamental shear stress measurements were again performed using the Jenike Shear Cell. A dimensional analysis of the plug flow system was carried out using the data obtained from the previous tests on fine coal plugs. Performing this analysis yielded a dimensionless number that characterize the minimum stable plug lengths possible for fine coal movement. This information is useful in establishing bounds on the flow conditions.

• Corporate Authors:

  Pittsburgh University, Pittsburgh

  Department of Chemical and Petroleum Engineering
  Pittsburgh, PA  United States  15213
• Authors:
  • KLINZING, G E
• Publication Date: 1988-11-1

Media Info

• Pagination: 12 p.

Subject/Index Terms

• TRT Terms: Coal; Density; Pipelines; Plugs (Fillers); Slurry
• Old TRIS Terms: Slurries
• Subject Areas: Highways; Pipelines; Terminals and Facilities; Vehicles and Equipment; I96: Vehicle Operating Costs;

Filing Info

• Accession Number: 00487938
• Record Type: Publication
• Source Agency: National Technical Information Service
• Report/Paper Numbers: DOE/PC/9058-T6
• Files: TRIS
• Created Date: Sep 30 1989 12:00AM