Solid circulation around a jet in a fluidized-bed gasifier. Final report

Technical Report · Wed Apr 01 04:00:00 EST 1981

DOI:https://doi.org/10.2172/6308151· OSTI ID:6308151

Caram, H. S.; Patrose, B.

The main purpose of the study was the analysis of particle circulation in the jet region of a fluidized bed gasifier. The two fundamental questions answered by this report relate to the measurement of particle velocities in the grid region and to the relevance of the jet zone to the operation of the reactor. Particle velocities were measured at corresponding points within a jet in the two-dimensional bed, using the optical fiber probe and a Laser Doppler Velocimeter (LDV). The probe measurements compare well with the LDV results in the main jet region. Particle velocities were also measured with the probe in the dense phase region of the fluidized bed where measurements were not possible using LDV. The resulting flow maps clearly indicate solids circulation patterns around jets and identify dead zones formed on the distributor plate. The entering gas jet was modeled assuming that the dense phase is entrained into the gas stream. The solid particles are then conveyed upwards along the jet penetration distance. Typical conditions for a fluidized bed combustor were used and the model includes the reactions between carbon and carbon dioxide and oxygen and the homogeneous oxidation of carbon monoxide. The results indicate that considerable reaction occurs in the gas jets entering the reactor and that they should be considered in any careful analysis of its operation.

• Research Organization: Lehigh Univ., Bethlehem, PA (USA)
• DOE Contract Number: FG01-78ET13384
• OSTI ID: 6308151
• Report Number(s): DOE/ET/13384-T2
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010404* -- Coal
Lignite
& Peat-- Gasification
CHEMICAL REACTIONS
COAL GASIFICATION
DATA
EXPERIMENTAL DATA
FLUIDIZED BED
GASIFICATION
INFORMATION
JETS
MATHEMATICAL MODELS
MEASURING INSTRUMENTS
NUMERICAL DATA
PARTICLES
THERMOCHEMICAL PROCESSES
VELOCITY