Development of high-temperature subsystem technology to a technology readiness state. Phase 1. Topical report, preliminary combustor design
Three low-Btu gas combustor designs were preliminarily defined and analytically assessed. Major design considerations included low emissions, safety, durability and good maintainability. On the basis of the design considerations and operating criteria, the premix combustion concept was selected for each combustor concept along with an annular mechanical design. Premixing has a superior capability to control oxides of nitrogen emissions (NO/sub x/) at the required high operating temperature levels, while the annular construction significantly reduces the amount of surface area requiring cooling. After selecting a candidate combustion process and mechanical design approach, three different liner cooling concepts were evaluated, each reflecting a varying degree of performance capability and development risk. The first liner scheme is based on conventional louver cooling techniques. Although this approach entails relatively low design risk for a 2600/sup 0/F combustor exit temperature condition, it has no growth potential for a higher operating temperature without improved materials or cooling techniques. The second scheme consists of a ceramic liner which is obtained by flame spraying the ceramic on feltmetal attached to a solid, cooled backing plate. This scheme affords good durability with available cooling air even at an operating temperature of 3000/sup 0/F.The third scheme employs steam, instead of air, as the cooling medium. Although more complex from a development standpoint, the use of steam permits all air to be used for combustion and exit pattern control during high-temperature operation. To enhance maintainability, the outer combustor case for each concept is designed to translate forward for accessibility to the premix head, liners, and high-pressure turbine area.
- Research Organization:
- United Technologies Corp., Farmington, Conn. (USA). Power Systems Div.
- DOE Contract Number:
- EX-76-C-01-2292
- OSTI ID:
- 5274551
- Report Number(s):
- FE-2292-11
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
COMBUSTORS
COOLING
DESIGN
AIR POLLUTION ABATEMENT
FLASHBACK
GAS TURBINES
LINERS
LOW BTU GAS
NITROGEN OXIDES
RESEARCH PROGRAMS
SAFETY
STABILITY
VERY HIGH TEMPERATURE
CHALCOGENIDES
ENERGY SOURCES
FLUIDS
FUEL GAS
FUELS
GASES
NITROGEN COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
POLLUTION ABATEMENT
TURBINES
TURBOMACHINERY
200104* - Fossil-Fueled Power Plants- Components