Combustion of coal-gas fuels in a staged combustor

Technical Report · Fri Jan 01 04:00:00 EST 1982

DOI:https://doi.org/10.2172/6861341· OSTI ID:6861341

Rosfjord, T J; McVey, J B; Sederquist, R A; Schultz, D F

Gaseous fuels produced from coal resources have been considered for use in industrial gas turbines. Such fuels generally have heating values much lower than the typical gaseous fuel, natural gas; the low heating value could result in unstable or inefficient combustion. Additionally, coal gas fuels may contain ammonia which if oxidized in an uncontrolled manner could result in unacceptable NO/sub x/ exhaust emission levels. Previous investigations have indicated that staged, rich-lean combustion represents a desirable approach to achieve stable, efficient, low NO/sub x/ emission operation for coal-derived liquid fuels containing up to 0.8-wt % nitrogen. An experimental program has been conducted to determine whether this fuel tolerance can be extended to include coal-derived gaseous fuels. The results of tests with three nitrogen-free fuels having heating values of 100, 250, and 350 Btu/scf and a 250 Btu/scf heating value doped to contain 0.7% ammonia are presented. The test results permit the following conclusions to be drawn: (1) Staged, rich-lean combustion represents the desirable approach to achieve ultra-low NO/sub x/ and CO emissions for coal gas fuels with heating values of 210 kJ/mol (238 Btu/scf) or higher. (2) Lean combustion represents the desirable approach to achieve ultra-low NO/sub x/ and CO emissions for coal gas fuels with low heating values (84 kJ/mol (95 Btu/scf)). (3) Staged combustion has the ability to limit NH/sub 3/ to NO/sub x/ conversion rates to less than 5%. NO/sub x/ emissions below the EPA limit can readily be achieved.

• Research Organization: United Technologies Corp., East Hartford, CT (USA). Research Center; United Technologies Corp., South Windsor, CT (USA). Power Systems Div.; National Aeronautics and Space Administration, Cleveland, OH (USA). Lewis Research Center
• DOE Contract Number: AI01-77ET13111
• OSTI ID: 6861341
• Report Number(s): DOE/NASA/13111-12; NASA-TM-82987; CONF-821018-8; ON: DE83001100
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010404 -- Coal
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010600 -- Coal
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014000* -- Coal
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CHALCOGENIDES
CHEMICAL COMPOSITION
CHEMICAL REACTIONS
COAL GASIFICATION
COMBUSTION
COMBUSTION PRODUCTS
DATA
EMISSION
EXPERIMENTAL DATA
FLUIDS
FUEL GAS
FUELS
GAS FUELS
GASES
GASIFICATION
INFORMATION
INTERMEDIATE BTU GAS
LOW BTU GAS
NITROGEN COMPOUNDS
NITROGEN OXIDES
NUMERICAL DATA
OXIDATION
OXIDES
OXYGEN COMPOUNDS
THERMOCHEMICAL PROCESSES