Fluidization in two-dimensional beds with a jet. 2. Hydrodynamic modeling

Journal Article · Sun May 01 04:00:00 EDT 1983 · Ind. Eng. Chem. Fundam.; (United States)

DOI:https://doi.org/10.1021/i100010a008· OSTI ID:5708170

Gidaspow, D; Ettehadleh, B

The object of this investigation is to develop an experimentally verified hydrodynamic model to predict solids circulation around a jet in a fluidized bed gasifier. Hydrodynamic models of fluidization use the principles of conservation of mass, momentum, and energy. To account for unequal velocities of solid and fluid phases, separate phase momentum balances are developed. Other fluid bed models used in the scale-up of gasifiers do not employ the principles of conservation of momentum. Therefore, these models cannot predict fluid and particle motion. In such models solids mixing is described by means of empirical transfer coefficients. A two-dimensional unsteady-state computer code was developed to give gas and solid velocities, void fractions, and pressure in a fluid bed with a jet. The growth, propagation, and collapse of bubbles was calculated. Time averaged voi fractions were calculated that showed good agreement with void fractions measured with a ..gamma..-ray densitometer. Calculated gas and solid velocities in the jet appeared to be reasonable.

• Research Organization: Department of Chemical Engineering, Illinois Institute of Technology, Chicago, Illinois 60616
• DOE Contract Number: FG21-78ET12229
• OSTI ID: 5708170
• Journal Information: Ind. Eng. Chem. Fundam.; (United States), Journal Name: Ind. Eng. Chem. Fundam.; (United States) Vol. 22:2; ISSN IECFA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400800* -- Combustion
Pyrolysis
& High-Temperature Chemistry
42 ENGINEERING
420400 -- Engineering-- Heat Transfer & Fluid Flow
421000 -- Engineering-- Combustion Systems
BUBBLE GROWTH
CHEMICAL REACTIONS
COMBUSTION
COMPUTER CODES
CONSERVATION LAWS
DENSITOMETERS
FLUID FLOW
FLUIDIZATION
FLUIDIZED-BED COMBUSTION
HYDRODYNAMIC MODEL
JETS
MATHEMATICAL MODELS
MEASURING INSTRUMENTS
OXIDATION
PARTICLE KINEMATICS
PARTICLE MODELS
PHOTOMETERS
PRESSURE MEASUREMENT
SOLIDS
STATISTICAL MODELS
THERMOCHEMICAL PROCESSES
THERMODYNAMIC MODEL
VELOCITY
VOID FRACTION