Experimental evaluation of catalytic combustion with heat removal at near stoichiometric conditions

Conference · Tue Jan 01 04:00:00 EST 1980

OSTI ID:6509998

Bulzan, D L

Two concentric tube configurations were tested to evaluate catalytic combustion with heat removal at near stoichiometric conditions. Tests were conducted at an inlet pressure of 1.5x10/sup 5/Pa, inlet fuel-air mixture temperatures from 780 to 960 K, combustion air flow rates from 0.78 to 1.5 g/s, equivalence ratios up to 0.90, and a range of cooling air flow rates. Propane and propylene fuels were used. Both configurations used air flowing through the center tube for cooling and combustion in the annulus on the catalytic surface. One configuration had the catalyst applied to the outside surface of the inner tube. Conversion of the fuel was very low for this configuration. At an inlet fuel-air mixture temperature of 960/sup 0/K, a combustion air flow rate of 1.5 g/s, an inlet velocity of 11 m/s, and a propylene fuel flow rate of 6.0x10/sup -2/ g/s, 34% of the heat available from the fuel was transferred to the cooling air in the center tube using a platinum catalyst. The other configuration had the catalyst applied to the inside surface of the outer tube. Conversion of the fuel was considerably better in this configuration. At an inlet mixture temperature of 925/sup 0/K, a combustion air flow rate of 1.0 g/s, an inlet velocity of 22 m/s, and propylene fuel flow rate of 6.0x10/sup -2/ g/s, 58% of the heat available from the fuel was transferred to the cooling air in the inner tube using a platinum/rhodium catalyst. At equivalence ratios as high as 0.87, NO/sub x/ emissions less than 0.2 g NO/sub 2//kg fuel were obtained. Combustion efficiencies greater than 99.5% were measured for certain operating conditions with this configuration.

• Research Organization: National Aeronautics and Space Administration, Cleveland, OH (USA). Lewis Research Center
• DOE Contract Number: AI01-77CS51040
• OSTI ID: 6509998
• Report Number(s): DOE/NASA/51040-23; CONF-800553-3; NASA-TM-81748
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
330201* -- External Combustion Engines-- Stirling Cycle
AIR
AIR POLLUTION CONTROL
CATALYTIC COMBUSTORS
CHALCOGENIDES
COMBUSTORS
CONTROL
COOLING
DATA
ENGINES
EXHAUST GASES
EXPERIMENTAL DATA
FLOW RATE
FLUIDS
FUEL-AIR RATIO
GASEOUS WASTES
GASES
HEAT ENGINES
INFORMATION
NITROGEN COMPOUNDS
NITROGEN OXIDES
NUMERICAL DATA
OPERATION
OXIDES
OXYGEN COMPOUNDS
PERFORMANCE
POLLUTION CONTROL
STIRLING ENGINES
VEHICLES
WASTES