Heater effects on cyclone performance for the separation of solids from high temperature and pressure effluents

Chrysi S. Laspidou, Desmond F. Lawler, Earnest F. Gloyna, Bruce Rittmann

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

A 25.4-mm diameter hydrocyclone with an underflow receiver was evaluated for its ability to achieve separation of fine particles from water at elevated temperatures and pressures relevant to supercritical oxidation. Temperature was varied from 25°C to 340°C, while pressure was maintained at 27.6 MPa. The particles studied were α-alumina. Particle-removal efficiency was affected by the separation capabilities of the hydrocyclone, deposition on the heater surface, and flocculation of the particles. Particle-size distributions and suspended solids analyses confirmed that cyclone, separation efficiency was controlled by the (density(particle) - density(water))/viscosity(water) ratio. Because this ratio is sensitive to temperature, especially in the neighborhood of the supercritical point, separation efficiencies sharply increased with temperature. Contrary to traditional air cyclone theory, removal efficiency was inversely correlated to flow rate. This result was caused by particle deposition and particle flocculation in the heater. Low flow rates increased heater detention times and, thus, opportunities for flocculation and particle deposition. Therefore, the performance of a hydrocyclone used in conjunction with supercritical oxidation depends on phenomena occurring in the heater and the hydrocyclone.

Original languageEnglish (US)
Pages (from-to)3059-3076
Number of pages18
JournalSeparation Science and Technology
Volume34
Issue number15
DOIs
StatePublished - 1999
Externally publishedYes

Fingerprint

Effluents
Flocculation
Water
Flow rate
Oxidation
Temperature
Aluminum Oxide
Particle size analysis
Particles (particulate matter)
Alumina
Viscosity
Air

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Filtration and Separation
  • Process Chemistry and Technology
  • Chemistry(all)

Cite this

Heater effects on cyclone performance for the separation of solids from high temperature and pressure effluents. / Laspidou, Chrysi S.; Lawler, Desmond F.; Gloyna, Earnest F.; Rittmann, Bruce.

In: Separation Science and Technology, Vol. 34, No. 15, 1999, p. 3059-3076.

Research output: Contribution to journalArticle

Laspidou, Chrysi S. ; Lawler, Desmond F. ; Gloyna, Earnest F. ; Rittmann, Bruce. / Heater effects on cyclone performance for the separation of solids from high temperature and pressure effluents. In: Separation Science and Technology. 1999 ; Vol. 34, No. 15. pp. 3059-3076.
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