Combustion characterization of coals for industrial applications. Fourth quarterly progress report, January 1-March 31, 1983
The Controlled Mixing History Furnace (CMHF) testing of the Alabama high volatile A bituminous coal was completed in December 1982. The main goal of the CMHF testing is to determine the effect of staged combustion on NO/sub x/ emissions control and its influence on overall combustion efficiency and to provide scale up information for extrapolating Drop Tube Furnace System results. The parameters studied include: (1) primary stage stoichiometry, (2) primary stage residence time, and (3) overall excess air level. In addition, one test was conducted on a finer grind coal (87% through 200 mesh) under optimum NO/sub x/ conditions to study the effect of particle size on NO/sub x/ emissions and carbon burnout. Based on this pilot scale study on the Arkadelphia coal, it can be concluded that a judicious use of staged combustion leads to an effective control of NO/sub x/ emissions without adversely affecting the overall fuel combustion efficiency. Specific conclusions follow. Both primary stage stoichiometry and primary stage residence time are very important parameters for controlling NO/sub x/ emissions. At 20% overall excess air: (1) an optimum primary stage stoichiometry of 50% of theoretical air, at a primary stage residence time of 1.45 seconds brought about a 43% reduction in NO/sub x/ compared to the unstaged baseline case; and (2) a primary stage residence time of 1.56 seconds, at a primary stage stoichiometry of 50% led to a 50% reduction in NO/sub x/ compared to the same unstaged baseline case. The effect of excess air on NO/sub x/ emissions under an optimum primary stage stoichiometry condition is moderate but significant. Increasing the excess air from 0 to 35%, while holding the primary stage stoichiometry constant at 50%, led to an increase in NO/sub x/ of 27%. 8 figures, 2 tables.
- Research Organization:
- Combustion Engineering, Inc., Windsor, CT (USA)
- DOE Contract Number:
- AC22-81PC40267
- OSTI ID:
- 5718214
- Report Number(s):
- DOE/PC/40267-4; ON: DE83013604
- Resource Relation:
- Other Information: Portions are illegible in microfiche products
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
54 ENVIRONMENTAL SCIENCES
BITUMINOUS COAL
CHEMICAL COMPOSITION
COAL
PARTICLE SIZE
STAGED COMBUSTION
NITROGEN OXIDES
AIR POLLUTION ABATEMENT
CHEMICAL REACTION YIELD
AIR
EXPERIMENTAL DATA
FUEL-AIR RATIO
FURNACES
RESEARCH PROGRAMS
BLACK COAL
CARBONACEOUS MATERIALS
CHALCOGENIDES
CHEMICAL REACTIONS
COMBUSTION
DATA
ENERGY SOURCES
FLUIDS
FOSSIL FUELS
FUELS
GASES
INFORMATION
MATERIALS
NITROGEN COMPOUNDS
NUMERICAL DATA
OXIDATION
OXIDES
OXYGEN COMPOUNDS
POLLUTION ABATEMENT
SIZE
THERMOCHEMICAL PROCESSES
YIELDS
014000* - Coal
Lignite
& Peat- Combustion
500200 - Environment
Atmospheric- Chemicals Monitoring & Transport- (-1989)