Heat transfer in three-phase fluidization and bubble-columns with high gas holdups
- Ohio State Univ., Columbus, OH (United States). Dept. of Chemical Engineering
Bubble column and three-phase fluidized bed reactors have wide applications in biotechnological and petroleum processes (Deckwer, 1985; Fan, 1989). In such biotechnological processes as fermentation and waste water treatment, small bubbles of oxygen and/or nitrogen are introduced in the column to enhance oxygen transfer and to ensure the stability of immobilized cell particles. In addition, tiny bubbles are produced during the biological process due to the production of surface active compounds. The presence of these small bubbles causes an increase in the gas holdup of the system. High gas holdups are also characteristics of industrial processes such as coal liquefaction and hydrotreating of residual oils. Good understanding of the transport properties of three-phase fluidized beds with high gas holdups is essential to the design, control and optimum operations of the commercial reactors employed in the above-mentioned processes. Heat-transfer studies in three-phase fluidized beds have been reviewed recently by Kim and Laurent (1991). Past studies focused primarily on the measurements of time-averaged heat transfer from the column wall to bed (Chiu and Ziegler 1983; Muroyama et al., 1986) or on immersed heating objects to bed (Baker et al., 1978; Kato et al., 1984) in aqueous systems. Recently, Kumar et al. (1992) provided a mechanistic understanding of the heat transfer in bubbly-liquid and liquid-solid systems. The purpose of this work is to investigate the heat transfer in a three-phase fluidized bed under high gas holdup conditions. The associated hydrodynamic behavior of the system is also studied.
- OSTI ID:
- 5782021
- Journal Information:
- AIChE Journal (American Institute of Chemical Engineers); (United States), Vol. 39:8; ISSN 0001-1541
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
FLUIDIZED BEDS
HEAT TRANSFER
MULTIPHASE FLOW
BIOTECHNOLOGY
BUBBLES
CARBON DIOXIDE
COAL LIQUEFACTION
FLUIDIZATION
HYDROGEN
KINETICS
METHANE
PETROLEUM REFINERIES
SURFACTANTS
WATER TREATMENT
ALKANES
CARBON COMPOUNDS
CARBON OXIDES
CHALCOGENIDES
ELEMENTS
ENERGY TRANSFER
FLUID FLOW
HYDROCARBONS
INDUSTRIAL PLANTS
LIQUEFACTION
NONMETALS
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
THERMOCHEMICAL PROCESSES
420400* - Engineering- Heat Transfer & Fluid Flow