TY - GEN
T1 - Catalytic combustion of natural gas over supported platinum
T2 - ASME 1996 International Gas Turbine and Aeroengine Congress and Exhibition, GT 1996
AU - Bond, Tani C.
AU - Noguchi, Ryan A.
AU - Chou, Chen Pang
AU - Mongia, Rajiv K.
AU - Chen, Jyh Yuan
AU - Dibble, Robert
PY - 1996/1/1
Y1 - 1996/1/1
N2 -
The use of a noble-met al combustion catalyst such as platinum or palladium in a natural-gas fired turbine can lower NO
x
, (nitrogen oxides, consisting of both NO and NO
2
) emissions for two reasons. First, most of the combustion occurs on the catalyst surface; surface production of NO
x
, is low or nonexistent. Second, the catalyst permits low temperature combustion below the traditional lean limit, thus inhibiting NO
x
, formation routes in the gas phase. Due to the complexity of the catalytic combustion process, the catalyst has traditionally been modeled as a "black box" that produces a desired amount of fuel conversion. While this approach has been useful for proof-of-concept studies, we expect practical applications to emerge from a greater understanding of the details of the catalytic combustion process. We have constructed . a numerical model of catalytic aorabustion based on the well-accepted CHEMKDI chemical kinetics formalism for gas-phase and surface chemistry. To support the model development, we built a research combustor. We present mea:sured and modeled axial profiles of temperature, fuel conversion, and pollutant emissions for natural-gas combtistion over platinum catalysts supported on ceramic honeycomb monoliths. NO
x
, emissions are below 1 ppm, and CO is observed at ppm levels. The data are taken at several lean equivalence ratios and flow rates. Fuel conversion rates occur in two regimes: a low, constant conversion rate and a higher conversion rate that increasei linearly with equivalence ratio. The agreement of the numerical model with the measured data is good at temperatures below 900 K; above this temperature, fuel conversion is underpredicted by as much as a factor of two. The predicted surface ignition temperatures agree well with the measured values. Results from the numerical model indicate that the fractional conversion rate of fuel has a linear dependence on the fraction of available surface reaction sites.
AB -
The use of a noble-met al combustion catalyst such as platinum or palladium in a natural-gas fired turbine can lower NO
x
, (nitrogen oxides, consisting of both NO and NO
2
) emissions for two reasons. First, most of the combustion occurs on the catalyst surface; surface production of NO
x
, is low or nonexistent. Second, the catalyst permits low temperature combustion below the traditional lean limit, thus inhibiting NO
x
, formation routes in the gas phase. Due to the complexity of the catalytic combustion process, the catalyst has traditionally been modeled as a "black box" that produces a desired amount of fuel conversion. While this approach has been useful for proof-of-concept studies, we expect practical applications to emerge from a greater understanding of the details of the catalytic combustion process. We have constructed . a numerical model of catalytic aorabustion based on the well-accepted CHEMKDI chemical kinetics formalism for gas-phase and surface chemistry. To support the model development, we built a research combustor. We present mea:sured and modeled axial profiles of temperature, fuel conversion, and pollutant emissions for natural-gas combtistion over platinum catalysts supported on ceramic honeycomb monoliths. NO
x
, emissions are below 1 ppm, and CO is observed at ppm levels. The data are taken at several lean equivalence ratios and flow rates. Fuel conversion rates occur in two regimes: a low, constant conversion rate and a higher conversion rate that increasei linearly with equivalence ratio. The agreement of the numerical model with the measured data is good at temperatures below 900 K; above this temperature, fuel conversion is underpredicted by as much as a factor of two. The predicted surface ignition temperatures agree well with the measured values. Results from the numerical model indicate that the fractional conversion rate of fuel has a linear dependence on the fraction of available surface reaction sites.
UR - http://www.scopus.com/inward/record.url?scp=84924007785&partnerID=8YFLogxK
U2 - 10.1115/96-GT-130
DO - 10.1115/96-GT-130
M3 - Conference contribution
AN - SCOPUS:84924007785
T3 - ASME 1996 International Gas Turbine and Aeroengine Congress and Exhibition, GT 1996
BT - Coal, Biomass and Alternative Fuels; Combustion and Fuels; Oil and Gas Applications; Cycle Innovations
PB - Web Portal ASME (American Society of Mechanical Engineers)
Y2 - 10 June 1996 through 13 June 1996
ER -