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Discussion of the Effects of Recirculating Exhaust Air on Performance and Efficiency of a Typical Microturbine

par De Paepe, Ward ;Delattin, Frank;Bram, Svend;De Ruyck, Jacques
Référence 24th International conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems(ECOS2011: Novi Sad, Serbia), Proceedings of the 24th International conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems (ECOS2011)., page (745-56)
Publication Publié, 2011

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Résumé :

This paper reports on a specific phenomenon, noticed during steam injection experiments on amicroturbine. During the considered experiments, measurements indicated an unsteady inlet airtemperature of the compressor, resulting in unstable operation of the microturbine. Noncontinuousexhaust air recirculation was a possible explanation for the observed behaviour ofthe microturbine.The aim of this paper is to investigate and demonstrate the effects of exhaust recirculation on amicrogasturbine. Depending on wind direction, exhaust air re-entered the engine, resulting inchanging inlet conditions which affects the operating regime of the microturbine.For this paper, two series of experiments were performed. The first experiment was avisualization test of the flue gasses on the existing microturbine installation, which allowed toconfirm the hypothesis of exhaust recirculation. A second series of experiments was performedin the wind tunnel. These series of experiments allowed investigation of the effect of the winddirection and position of the stack on flue gasses flow. Next to the experiments, steady-statesimulations in ASPEN® of partial exhaust recirculation were performed in order to study theeffect of exhaust recirculation on thermodynamic performance of the microturbine. DynamicSimulink® simulations of the non-continuous recirculation revealed the effects of frequency andamplitude on average performance and stability.Experiments visualizing the exhaust flow confirmed the hypothesis of exhaust recirculation.Results from simulation supported the important impact of this phenomenon. Wind tunnel testsdemonstrated the influence of the wind direction on recirculation and revealed the necessity toheighten the stack, thus preventing exhaust recirculation.