3 June 2015 Fuel flexibility via real-time Raman fuel-gas analysis for turbine system control
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Abstract
The modern energy production base in the U.S. is increasingly incorporating opportunity fuels such as biogas, coalbed methane, coal syngas, solar-derived hydrogen, and others. In many cases, suppliers operate turbine-based generation systems to efficiently utilize these diverse fuels. Unfortunately, turbine engines are difficult to control given the varying energy content of these fuels, combined with the need for a backup natural gas supply to provide continuous operation. Here, we study the use of a specially designed Raman Gas Analyzer based on capillary waveguide technology with sub-second response time for turbine control applications. The NETL Raman Gas Analyzer utilizes a low-power visible pump laser, and a capillary waveguide gas-cell to integrate large spontaneous Raman signals, and fast gas-transfer piping to facilitate quick measurements of fuel-gas components. A U.S. Department of Energy turbine facility known as HYPER (hybrid performance system) serves as a platform for apriori fuel composition measurements for turbine speed or power control. A fuel-dilution system is used to simulate a compositional upset while simultaneously measuring the resultant fuel composition and turbine response functions in real-time. The feasibility and efficacy of system control using the spontaneous Raman-based measurement system is then explored with the goal of illustrating the ability to control a turbine system using available fuel composition as an input process variable.
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M. Buric, M. Buric, S. Woodruff, S. Woodruff, B. Chorpening, B. Chorpening, D. Tucker, D. Tucker, "Fuel flexibility via real-time Raman fuel-gas analysis for turbine system control", Proc. SPIE 9482, Next-Generation Spectroscopic Technologies VIII, 94820S (3 June 2015); doi: 10.1117/12.2177015; https://doi.org/10.1117/12.2177015
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