Oil shale combustor model developed by Greek researchers

Journal Article · Mon Sep 01 00:00:00 EDT 1986 · Pace Synth. Fuels Rep.; (United States)

OSTI ID:5050094

Work carried out in the Department of Chemical Engineering at the University of Thessaloniki, Thessaloniki, Greece has resulted in a model for the combustion of retorted oil shale in a fluidized bed combustor. The model is generally applicable to any hot-solids retorting process, whereby raw oil shale is retorted by mixing with a hot solids stream (usually combusted spent shale), and then the residual carbon is burned off the spent shale in a fluidized bed. Based on their modelling work, the following conclusions were drawn by the researchers. (1) For the retorted particle size distribution selected (average particle diameter 1600 microns) complete carbon conversion is feasible at high pressures (2.7 atmosphere) and over the entire temperature range studied (894 to 978 K). (2) Bubble size was found to have an important effect, especially at conditions where reaction rates are high (high temperature and pressure). (3) Carbonate decomposition increases with combustor temperature and residence time. Complete carbon conversion is feasible at high pressures (2.7 atmosphere) with less than 20 percent carbonate decomposition. (4) At the preferred combustor operating conditions (high pressure, low temperature) the main reaction is dolomite decomposition while calcite decomposition is negligible. (5) Recombination of CO/sub 2/ with MgO occurs at low temperatures, high pressures, and long particle residence times.

• OSTI ID: 5050094
• Journal Information: Pace Synth. Fuels Rep.; (United States), Vol. 23:3
• Country of Publication: United States
• Language: English

Related Subjects

04 OIL SHALES AND TAR SANDS
OIL SHALES
FLUIDIZED-BED COMBUSTION
RETORTING
RETORTS
MATHEMATICAL MODELS
BUBBLES
CARBONATES
CHEMICAL REACTION KINETICS
DOLOMITE
GREECE
PARTICLE SIZE
PRESSURE EFFECTS
TEMPERATURE EFFECTS
TIME DEPENDENCE
ALKALINE EARTH METAL COMPOUNDS
BITUMINOUS MATERIALS
CALCIUM CARBONATES
CALCIUM COMPOUNDS
CARBON COMPOUNDS
CARBONACEOUS MATERIALS
CARBONATE MINERALS
CHEMICAL REACTIONS
CHEMICAL REACTORS
COMBUSTION
DECOMPOSITION
DEVELOPING COUNTRIES
DISTILLATION EQUIPMENT
EASTERN EUROPE
ENERGY SOURCES
EQUIPMENT
EUROPE
FOSSIL FUELS
FUELS
KINETICS
MAGNESIUM CARBONATES
MAGNESIUM COMPOUNDS
MATERIALS
MINERALS
OXIDATION
OXYGEN COMPOUNDS
REACTION KINETICS
SIZE
THERMOCHEMICAL PROCESSES
040402* - Oil Shales & Tar Sands- Surface Methods