There is an increasing interest in catalytic combustors fuelled by low-heating value (LHV) gases, with a LHV of 5–7 MJ/Nm3. This is because catalytic combustion could be advantageous compared to flame combustion with respect to stable combustion of LHV-gases and low conversions of fuel-N (mainly to In the present project, funded by the EU Joule Program, catalytic combustion of gasified wood for gas turbine applications is studied. A synthetic gas mixture of CO, and that resembles the output from a fluidized bed gasifier using biomass as raw material, is used. The gas mixture is mixed with air at atmospheric pressure and combusted over washcoated cordierite monoliths in a bench-scale laboratory quartz-reactor. The objectives of the work described here are twofold. To begin with, improvement of the thermal stability of hexaaluminate washcoats by substitutions of rare earth or transition metal compounds is being studied. Secondly, catalytic combustion of gasified biomass over these washcoats has been studied in a bench-scale unit. In this on-going project, obtained result show that it is possible to improve the surface area of hexaaluminate compounds up to 17 m2/g after careful synthesis and calcination up to 1400°C for four hours. The selectivity of -conversion to is at present at 60 percent, but varies strongly with temperature. Fuel components such as CO, and ignite at temperatures close to compressor outlet temperatures. This means that a pilot-flame may not be needed for ignition of the fuel. A comparison between a Pd-impregnated lanthanum hexaaluminate and a Mn-substituted lanthanum hexaaluminate showed that the ignition temperature and the -formation varied strongly over the two different catalysts.
Development of Hexaaluminate Catalysts for Combustion of Gasified Biomass in Gas Turbines
Contributed by the International Gas Turbine Institute (IGTI) of THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS for publication in the ASME JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Paper presented at the International Gas Turbine and Aeroengine Congress and Exhibition, Stockholm, Sweden, June 2–5, 1998; ASME Paper 98-GT-338. Manuscript received by IGTI Mar. 18, 1998; final revision received by the ASME Headquarters Mar. 23, 1999. Associate Editor: R. Kielb.
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Johansson , E. M., Danielsson , K. M. J., Ersson , A. G., and Ja¨ra˚s , S. G. (March 26, 2002). "Development of Hexaaluminate Catalysts for Combustion of Gasified Biomass in Gas Turbines ." ASME. J. Eng. Gas Turbines Power. April 2002; 124(2): 235–238. https://doi.org/10.1115/1.1335478
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