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2019-09-04 - Colloque/Article dans les actes avec comité de lecture - Anglais - 7 page(s)

De Paepe Ward , Pappa Alessio , Montero Carrero Marina, Bricteux Laurent , Contino francesco, "Reducing Waste Heat to the Minimum: M-Power cycle concept applied to micro Gas Turbines" in SUstainable PolyEnergy generation and HaRvesting Conference , SUPEHR'19, Savona, Italy, 2019

  • Codes CREF : Recherche énergétique (DI2290), Thermodynamique appliquée (DI2210), Combustion (DI2212), Turbines a gaz (DI2223)
  • Unités de recherche UMONS : Thermique et Combustion (F704)
  • Instituts UMONS : Institut de Recherche en Energétique (Energie)

Abstract(s) :

(Anglais) With the current shift from centralized to more decentralized power production, new opportunities arise for small-scale Combined Heat and Power (CHP) production units like micro Gas Turbines (mGTs). However, to fully embrace these opportunities, the current mGT has to become more flexible in terms of operation, i.e. decoupling of heat and power production in CHP mode to make the operation independent of the demand for heat. Cycle humidification during periods with low or no heat demand is a possible route to handle this problem. Cycle humidification has already proven to offer a solution to increase the operation flexibly of the mGT by increasing its electrical efficiency. Nevertheless, even when applying the most advanced humidified cycle concept, i.e. the micro Humid Air Turbine (mHAT), the electrical performance increase remains rather limited (respectively 15.9 kWe and 3.4%point electrical power and efficiency increase for the mHAT concept when applied to a 100kWe dry classical mGT operating at constant rotational speed). In this perspective, the more recent Maisotsenko (or M-power) cycle concept offers a larger potential for humidification and therefore could further improve the mGT cycle. In this paper, the concept of the M-power cycle is applied to a 100 kWe mGT (Turbec T100) to assess and compare its performance to different humidified mGT cycles. The results of this numerical analysis highlighted that the M-power cycle has the highest waste heat recovery and thus the highest electrical efficiency (up to 147 kWe electric power output with an electric efficiency of 42.1%), making it an interesting application from a thermodynamic point of view. Additionally, from a technological point of view, the M-power cycle is also preferable for the small-scale mGT. Indeed, in the M-power cycle, saturation tower, aftercooler, recuperator and economizer are combined in one single component, significantly reducing the cycle complexity. The main limitation is the saturator, that requires a dew point effectiveness up to 96% to achieve the simulated performance.