Coal-water slurry (CWS) dispenser: Final report
This thesis addressed some of the problems associated with using Coal-Water Slurry as a fuel in gas turbine combustors. A technique has been developed which reduces the velocity and average droplet size distribution needed for good atomization to achieve high combustion efficiency. Finely atomized droplets are desired to minimize the number of coal particles which fuse together in the high radiation zone. Any big droplet discharged from the atomizing nozzle will be slow to dry and ignite, which consequently may reduce the combustion efficiency. To study the characteristics of a CWS spray entering the combustor, a dryer dispenser unit was designed and built. Typical gas turbine operating conditions are discussed. Atomization aspects are discussed. CWS nozzles are found to produce high velocity spray with a wide range of particle sizes. Dried samples were studied under the scanning electron microscope. The micrographs of the samples collected in the range of 70 to 550/sup 0/F show that the individual coal particles are within a 15 micron range. The single droplet drying rate was found to be unrelated to that occurring inside a jet. Particles collected at room temperature are sharp and not rounded at the edges. Particles collected at 400/sup 0/F have a tendency to stay together; they are much more rounded at the edges than those collected at 70/sup 0/F. The individual particle size distribution is not much affected in the range of temperatures from 70 to 500/sup 0/F, but agglomeration is directly proportional to the dryer temperature. Since the particle size distribution of CWS does not change much in the range of 70 to 500/sup 0/F, predrying prior to entering the high radiation zone, is not beneficial. Fine CWS atomization is more important to decrease the ignition delay and to maximize the combustion efficiency.
- Research Organization:
- West Virginia Univ., Morgantown (USA). Dept. of Mechanical and Aerospace Engineering
- DOE Contract Number:
- AC21-84MC21071
- OSTI ID:
- 6256302
- Report Number(s):
- DOE/MC/21071-2358; ON: DE87009073
- Resource Relation:
- Other Information: Portions of this document are illegible in microfiche products. Original copy available until stock is exhausted
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
42 ENGINEERING
COMBUSTORS
FUELS
FUEL SLURRIES
ATOMIZATION
DRYING
AGGLOMERATION
COAL
COMPRESSORS
DROPLETS
FUEL INJECTION SYSTEMS
GAS TURBINES
NOZZLES
PARTICLE SIZE
PARTICLES
SPRAYS
WATER
CARBONACEOUS MATERIALS
DISPERSIONS
ENERGY SOURCES
FOSSIL FUELS
FUEL SYSTEMS
HYDROGEN COMPOUNDS
MACHINERY
MATERIALS
MIXTURES
OXYGEN COMPOUNDS
SIZE
SLURRIES
SUSPENSIONS
TURBINES
TURBOMACHINERY
014000* - Coal
Lignite
& Peat- Combustion
421000 - Engineering- Combustion Systems