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L i q u i d B i o f u e l B u r n i n g Mi c r o t u r b i n e s Current situation Biofuel-burning Microturbine Although in general all commercially available microturbine systems have the potential to be operated with liquid fuels, currently only one microturbine type does exist which is specified by the producer for the use of liquid fuels, namely the Capstone C30 (Liquid Fuel) unit. Thereby, the term ‘liquid fuel’ only refers to fossil fuels such as diesel and methanol, and no explicit specifications exist for liquid biofuels. Currently no liquid fuel burning microturbines are used for commercial applications in Europe. However, several research and demonstration units investigate the technical and emission properties of liquid fuel systems. Two Turbec T100 units are operated on methanol (produced from natural gas) by the Norwegian oil and gas company Statoil ASA. This demonstration project is implemented in the framework of the EC co-funded project ‘Optimised Microturbine Energy Systems – OMES’, and its main aim is to introduce methanol (as innovative energy carrier) to the fuel market for distributed electricity and heat production. With respect to liquid biofuels use in microturbines, at the Institute of Mechanical Engineering and Marine-Technology, University of Rostock, a study was performed on the utilisation of bio-oils in microturbines. Laboratory tests using a T216 microturbine from Deutz were carried out on rapeseed methyl ester, sunflower methyl ester, animal fat methyl ester, rapeseed oil, false flax oil, waste edible oil, pyrolysis oil as well as ethanol. This research study concluded that a variety of bio-fuels may be used in microturbines after system adjustments have been made which are necessary due to different physical and chemical properties. A further project investigating the use of bio-diesel and vegetable oil (rapeseed oil) in microturbines is currently performed by the University of Applied Sciences Aachen in cooperation with the German Capstone distributor E-Quad Power Systems. This project focuses on combustion properties as well as the identification of required adaptations of the fuel supply system. With the two tanks of the test rig displayed in Figure 10, a mixtur e of diesel and rapeseed oil is produced. In a heating section both fuels are heated to a constant level and mixed with a stirrer. Tests started with running the turbine on 100% diesel and the amount of rapeseed oil will be increased by 10% steps to evaluate effects on turbine emissions and efficiency. First test results are expected for late 2004. Fig. 10: Microturbine Bio Fuel Test Rig -9-PDF Image | Biofuel-burning Microturbine Opportunities for Biofuel-burning Microturbines in the European Decentralised-generation Market (BIOTURBINE)
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