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The target of the project is to assess the feasibility of burning biomass-derived gases in a catalytic combustor which will replace the ordinary flame combustor, as a mean to overcome difficulties arising with the use of such fuels in gas turbines, in the range of 1 to 5 MWe. A dual fuel strategy is necessary for the practical use of gases generated from biofuels, because Diesel fuel will be used for start-up and back-up. It includes laboratory and pilot-scale investigations, as well as a preliminary technical and economic analysis of the system.

Hexaaluminates and noble metals catalysts as well as combinations of both are suitable materials for the dual-fuel combustor, while perovskites ought to be excluded for low durability season. Ignition temperatures over base metal or noble metal catalysts are low enough so as to avoid a preheating system. The fuel-N conversion and the NOx formation have been studied extensively, and conversion of ammonia to molecular nitrogen ranging between 60 to 80 % have been achieved with low activity catalysts and in the 800 � 950°C temperature window. This conversion is probably due to a complex combination of SNCR and SCR processes, which were not clearly discriminated.

Pilot testing showed that low emissions of both unburned hydrocarbons and carbon monoxide could be achieved and for fuels with a low level of fuel bound nitrogen also low emissions of NOx could be achieved. But poor ammonia to molecular nitrogen conversion was achieved with the catalysts combination used.

The models developed to simulate the catalytic section of the combustor were used for the analysis of the pilot tests as well as for the preliminary design of the full-scale catalytic combustor.

Themodynamic cycle calculations showed that a 35 % gas turbine efficiency can be reached with a machine running on biomass based gas, while the performance is a bit lower with Diesel. However, the global efficiency (including gas compression) is limited to 28

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