Role of seed particles in the prediction and control of product particle size in fluidized-bed dryers

Technical Report · Tue Apr 01 00:00:00 EST 1980

DOI:https://doi.org/10.2172/5430544· OSTI ID:5430544

Grimmett, E. S.

Particle size distribution in a fluidized-bed dryer (where a solution is converted to a solid granular particle) depends on several different rate processes taking place. These include particle growth, particle attrition, product rate, feed deposition rate, elutriation rate, and seed attrition rate. While these rate processes are basic, depending on the material being dried, some become more important than others. Few new seed particles are generated within the bed when the physical properties of many materials being dried are such that little particle attrition takes place. Under these conditions, the particle size distribution in the bed continually increases unless some measure is taken to introduce into, or generate within the bed, new seed particles. This paper briefly describes the mathematical model which predicts the particle size distribution expected when drying solutions in a fluidized bed. The important role that seed particles play in determining the steady-state particle size distribution of the bed is stressed. An experiment is described in which information was obtained that helped determine what seed particles are, and what size particles became seeds.

• Research Organization: Exxon Nuclear Idaho Co., Inc., Idaho Falls (USA)
• DOE Contract Number: AC07-79ID01675
• OSTI ID: 5430544
• Report Number(s): ENICO-1036; TRN: 80-008436
• Country of Publication: United States
• Language: English

Related Subjects

12 MANAGEMENT OF RADIOACTIVE AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES
DRYING
PARTICLE SIZE
CONTROL
DRYERS
FLUIDIZED BED
MANAGEMENT
MATHEMATICAL MODELS
NUCLEATION
RADIOACTIVE WASTES
SLURRIES
SOLIDIFICATION
SOLUTIONS
DISPERSIONS
MIXTURES
PHASE TRANSFORMATIONS
RADIOACTIVE MATERIALS
SIZE
SUSPENSIONS
WASTES
052001* - Nuclear Fuels- Waste Processing