Combustion, heat transfer, pollutant emission, and ash deposition characteristics of concentrated Coal-Water Slurries. Interim report, Phase I
A detailed combustion characterization study is underway at the MIT Combustion Research Facility (CRF), on industrial type (turbulent diffusion) flames obtained with Coal-Water Slurries (CWS). The objectives of the study are to characterize CWS flames, obtained under a variety of input conditions characteristic of boiler operation, with respect to ignition, flame stability, carbon conversion efficiency, radiative heat transfer, gaseous pollutant emissions (NO/sub x/) and the physical-chemical nature of the in-flame particulate matter and ash deposits formed upon the fireside surfaces of the combustion chamber. Results are reported on the first experimental trials carried out at the CRF in the on-going research program. The experimental results demonstrated that ignition and flame stability raise potentially serious technical problems in the combustion of this substitute fuel, and that they are highly sensitive to the quality of atomization, to the pattern of gas flow near the burner (near-field aerodynamics), to the heat extraction and to air preheat. High levels of combustion air swirl were found to greatly enhance the stability of CWS flames. Increased swirl causes more intense recirculation of hot combustion products to the flame root, resulting in a high convective feedback of heat to the fuel spray entering the combustion chamber. However, conditions favoring rapid ignition and flame stability - intense fuel-air mixing, high air preheat, low near-field heat extraction - also tend to increase NO/sub x/ emission problem. In general, the selection of the best or optimal CWS flame input conditions will reflect a compromise in these conflicting requirements. 3 references.
- Research Organization:
- Massachusetts Inst. of Tech., Cambridge (USA)
- DOE Contract Number:
- FG22-81PC40292
- OSTI ID:
- 6649358
- Report Number(s):
- DOE/PC/40292-T2; ON: DE84015910
- Resource Relation:
- Other Information: Portions are illegible in microfiche products
- Country of Publication:
- United States
- Language:
- English
Similar Records
Combustion, heat transfer, ash deposition, and pollutant emission characteristics of coal-water slurries. Phase II. Final report, January 1, 1983-December 31, 1983
Combustion, heat transfer, pollutant emission and ash deposition characteristics of coal-water fuels. Phase III program. Final report, January 1, 1984-June 30, 1985
Related Subjects
ASHES
CHEMICAL ANALYSIS
FLAMES
CHEMICAL COMPOSITION
STABILITY
TEMPERATURE MEASUREMENT
FUEL SLURRIES
COMBUSTION PRODUCTS
COMBUSTION PROPERTIES
IGNITION
COAL
DEPOSITION
EXPERIMENTAL DATA
HEAT TRANSFER
MIXTURES
NITROGEN OXIDES
RESEARCH PROGRAMS
SCANNING ELECTRON MICROSCOPY
TEST FACILITIES
WATER
CARBONACEOUS MATERIALS
CHALCOGENIDES
DATA
DISPERSIONS
ELECTRON MICROSCOPY
ENERGY SOURCES
ENERGY TRANSFER
FOSSIL FUELS
FUELS
HYDROGEN COMPOUNDS
INFORMATION
MATERIALS
MICROSCOPY
NITROGEN COMPOUNDS
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
RESIDUES
SLURRIES
SUSPENSIONS
014000* - Coal
Lignite
& Peat- Combustion