skip to main content

Title: Fluidization characteristics of power-plant fly ashes and fly ash-charcoal mixtures. [MS Thesis; 40 references]

As a part of the continuing research on aluminum recovery from fly ash by HiChlor process, a plexiglass fluidization column system was constructed for measurement of fluidization parameters for power-plant fly ashes and fly ash-charcoal mixtures. Several bituminous and subbituminous coal fly ashes were tested and large differences in fluidization characteristics were observed. Fly ashes which were mechanically collected fluidized uniformly at low gas flow rates. Most fly ashes which were electrostatically precipitated exhibited channeling tendency and did not fluidize uniformly. Fluidization characteristics of electrostatically collected ashes improve when the finely divided charcoal powder is added to the mixture. The fluidization of the mixture was aided initially by a mechanical stirrer. Once the fluidization had succeeded, the beds were ready to fluidize without the assistance of a mechanical action. Smooth fluidization and large bed expansion were usually observed. The effects of charcoal size and aspect ratio on fluidization characteristics of the mixtures were also investigated. Fluidization characteristics of a fly ash-coal mixture were tested. The mixture fluidized only after being oven-dried for a few days.
Authors:
Publication Date:
OSTI Identifier:
5604125
Report Number(s):
IS-T-880
DOE Contract Number:
W-7405-ENG-82
Resource Type:
Technical Report
Resource Relation:
Other Information: Thesis
Research Org:
Ames Lab., IA (USA)
Country of Publication:
United States
Language:
English
Subject:
01 COAL, LIGNITE, AND PEAT; 32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION; FLY ASH; FLUIDIZATION; WASTE PRODUCT UTILIZATION; ALUMINIUM; CHLORINATION; FOSSIL-FUEL POWER PLANTS; RECOVERY; AEROSOL WASTES; CHEMICAL REACTIONS; ELEMENTS; HALOGENATION; METALS; POWER PLANTS; THERMAL POWER PLANTS; WASTES 010800* -- Coal, Lignite, & Peat-- Waste Management; 320305 -- Energy Conservation, Consumption, & Utilization-- Industrial & Agricultural Processes-- Industrial Waste Management