Turbine Combustion: Flashback

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Turbine Combustion: Flashback: Applications which fit the following description should be submitted under this funding opportunity title of Water Impacts from Turbine Combustion: Flashback (DE-PS26-04NT41898-10). In support of the Turbine Program, advanced power systems has goals of very low plant emissions (NOx less than 2-ppm) and turbine combustors capable of stable operation with fuel compositions ranging from natural gas to a broad range for syngas. Although syngas has wide composition variability, the following gives an example of representative properties for a fuel gas from oxygen blown coal gasification: 25% H2, 40% CO, 20% H2O, and 200 BTU/ft3 lower heating value. The primary goal for the research is to provide fundamental information and data, or computational tools, that will enable design of turbine combustors with improved stability and emissions. Proposed research should give highest priority to addressing fuel composition and variability issues associated with use of syngas and alternate fuels in gas turbine combustors. Flashback is an issue for premixed combustors, both in terms of increased emissions and hardware damage. Proposals are sought in this topic for achieving premixing without excessive pressure drop and suitable fuels with a variety of flame speeds, including syngas and hydrogen. Research of interest includes: 1. The effect of syngas compositions and percentage concentrations of higher hydrocarbons in natural gas on the propensity of a premixed flame to flashback. Of particular interest is the propensity to flashback in the presence of combustion oscillations (either self-excited or externally driven). 2. Measurement of flashback characteristics representing various fuels and fuel compositions (IGCC syngas, natural gas composition variations, liquid fuels, etc.), especially for high pressures and in the 700 to 950K temperature range. Of special interest is the effect of higher concentrations of H2 in syngas on flashback.