Oil shale loss from a laboratory fluidized bed
The rate of loss of dust from a laboratory scale fluidized bed of Green River oil shale has been measured. The rate of loss of dust from raw shale in the bed was approximately 1%/min for the first few minutes, and then decreased. The loss rate for retorted or burnt shale was 5 to 10 times higher. The rate for retorted and burned shale were nearly the same. The time required for a 10 wt% loss of mass was approximately 3 min for processed shale and 1 hour for raw shale. Particles left in the bed during fluidization lost sharp corners, but kept the original elongation. Dust lost by the bed has a very wide range of sizes, and demonstrated a strong bimodal distribution of sizes. The bimodal distribution of particles is interpreted as resulting from two mechanisms of dust generation: fracture and wear. Fracture of large particles sometimes produced fragments which were small enough to be blown out of the bed. These fragments were much larger than the individual mineral grains in the shale. The fracture mechanism was dominant in the case of raw shale. Dust in the smaller particle-size range was generated by wear. Wear was the dominant mechanisms in the case of burned shale, whereas, for retorted shale, nearly equal amounts of dust were generated by each mechanism. 13 refs., 8 figs., 6 tabs.
- Research Organization:
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 6312562
- Report Number(s):
- UCRL-100766; CONF-8904193-2; ON: DE89010246
- Resource Relation:
- Conference: 22. annual oil shale symposium, Golden, CO, USA, 19 Apr 1989; Other Information: Portions of this document are illegible in microfiche products
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
DUSTS
LOSSES
OIL SHALES
FLUIDIZATION
FLUIDIZED BEDS
GREEN RIVER FORMATION
PARTICLE SIZE
RETORTS
SPENT SHALES
WEAR
BITUMINOUS MATERIALS
CARBONACEOUS MATERIALS
CHEMICAL REACTORS
DISTILLATION EQUIPMENT
ENERGY SOURCES
EQUIPMENT
FOSSIL FUELS
FUELS
GEOLOGIC FORMATIONS
MATERIALS
SIZE
040402* - Oil Shales & Tar Sands- Surface Methods