Coal burnout and nitrogen pollutant formation processes during lignite slurry and pulverized lignite combustion
Thesis/Dissertation
·
OSTI ID:5571409
Detailed combustion tests of hot-water dried lignite slurry and the parent pulverized lignite were performed in a laboratory-scale combustor with local measurements obtained throughout the combustion zone. Operating parameter studied included secondary air swirl number, slurry mean droplet diameter, stoichiometric ratio, and primary air velocity. Greater than 99% coal burnout (daf) was achieved in an estimated reactor residence time of 1.4 s. Flame stability during slurry combustion was strongly affected by the atomized droplet size. A mass mean droplet diameter of 50 {mu}m or less was required to obtain a stable flame with high coal burnout. Rapid mixing of the fuel with the secondary air was obtained during the slurry combustion tests due to the high momentum provided to the slurry droplets from the atomizer. This rapid mixing prevented the formation of any fuel-rich regions within the reactor. Secondary air swirl only had a minor effect on the slurry combustion and pollutant formation processes. The pulverized lignite tests showed much slower mixing of the fuel with the secondary air by forming a strong fuel-rich region along the reactor centerline. Secondary air swirl aided flame stability and produced a minimum in NO emissions as swirl number was increased. Computer model predictions showed good agreement with the experimental burnout data.
- Research Organization:
- Brigham Young Univ., Provo, UT (USA)
- OSTI ID:
- 5571409
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
01 COAL, LIGNITE, AND PEAT
014000* -- Coal
Lignite
& Peat-- Combustion
BENCH-SCALE EXPERIMENTS
BROWN COAL
BURNOUT
CARBONACEOUS MATERIALS
CHALCOGENIDES
CHEMICAL REACTION KINETICS
COAL
COMBUSTION KINETICS
COMBUSTORS
COMPUTERIZED SIMULATION
DISPERSIONS
DROPLETS
ENERGY SOURCES
FLAMES
FLUID FLOW
FOSSIL FUELS
FUEL SLURRIES
FUEL-AIR RATIO
FUELS
HOT WATER
HYDROGEN COMPOUNDS
KINETICS
LIGNITE
MATERIALS
MIXING
MIXTURES
NITRIC OXIDE
NITROGEN COMPOUNDS
NITROGEN OXIDES
OXIDES
OXYGEN COMPOUNDS
PARTICLE SIZE
PARTICLES
PULVERIZED FUELS
REACTION KINETICS
SIMULATION
SIZE
SLURRIES
STABILITY
SUSPENSIONS
SYNTHESIS
VORTEX FLOW
WATER
014000* -- Coal
Lignite
& Peat-- Combustion
BENCH-SCALE EXPERIMENTS
BROWN COAL
BURNOUT
CARBONACEOUS MATERIALS
CHALCOGENIDES
CHEMICAL REACTION KINETICS
COAL
COMBUSTION KINETICS
COMBUSTORS
COMPUTERIZED SIMULATION
DISPERSIONS
DROPLETS
ENERGY SOURCES
FLAMES
FLUID FLOW
FOSSIL FUELS
FUEL SLURRIES
FUEL-AIR RATIO
FUELS
HOT WATER
HYDROGEN COMPOUNDS
KINETICS
LIGNITE
MATERIALS
MIXING
MIXTURES
NITRIC OXIDE
NITROGEN COMPOUNDS
NITROGEN OXIDES
OXIDES
OXYGEN COMPOUNDS
PARTICLE SIZE
PARTICLES
PULVERIZED FUELS
REACTION KINETICS
SIMULATION
SIZE
SLURRIES
STABILITY
SUSPENSIONS
SYNTHESIS
VORTEX FLOW
WATER