Effect of syngas composition and CO2-diluted oxygen on performance of a premixed swirl-stabilized combustor.
Future energy systems based on gasification of coal or biomass for co-production of electrical power and fuels may require gas turbine operation on unusual gaseous fuel mixtures. In addition, global climate change concerns may dictate the generation of a CO{sub 2} product stream for end-use or sequestration, with potential impacts on the oxidizer used in the gas turbine. In this study the operation at atmospheric pressure of a small, optically accessible swirl-stabilized premixed combustor, burning fuels ranging from pure methane to conventional and H{sub 2}-rich and H{sub 2}-lean syngas mixtures is investigated. Both air and CO{sub 2}-diluted oxygen are used as oxidizers. CO and NO{sub x} emissions for these flames have been determined from the lean blowout limit to slightly rich conditions ({phi} - 1.03). In practice, CO{sub 2}-diluted oxygen systems will likely be operated close to stoichiometric conditions to minimize oxygen consumption while achieving acceptable NO{sub x} performance. The presence of hydrogen in the syngas fuel mixtures results in more compact, higher temperature flames, resulting in increased flame stability and higher NO{sub x} emissions. Consistent with previous experience, the stoichiometry of lean blowout decreases with increasing H{sub 2} content in the syngas. Similarly, the lean stoichiometry at which CO emissions become significant decreases with increasing H{sub 2} content. For the mixtures investigated, CO emissions near the stoichiometric point do not become significant until {phi} > 0.95. At this stoichiometric limit, CO emissions rise more rapidly for combustion in O{sub 2}-CO{sub 2} mixtures than for combustion in air.
- Research Organization:
- Sandia National Laboratories (SNL), Albuquerque, NM, and Livermore, CA (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC04-94AL85000
- OSTI ID:
- 1028907
- Report Number(s):
- SAND2007-0041C; TRN: US201122%%602
- Resource Relation:
- Conference: Proposed for presentation at the ASME Turbo Expo 2007 held May 14-17, 2007 in Montreal, Canada.
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
03 NATURAL GAS
08 HYDROGEN
09 BIOMASS FUELS
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
ATMOSPHERIC PRESSURE
BIOMASS
BLOWOUTS
CLIMATIC CHANGE
COAL
COMBUSTION
ENERGY SYSTEMS
FLAMES
GAS TURBINES
GASIFICATION
HYDROGEN
METHANE
MIXTURES
OXIDIZERS
OXYGEN
STABILITY
STOICHIOMETRY
SYNGAS PROCESS