par Montero Carrero, Marina ;De Paepe, Ward ;Bram, Svend;Parente, Alessandro ;Contino, Francesco
Référence 8th International Gas Turbine Conference: The Future of Gas Turbine Technology(IGTC2016: Brussel, Belgium), Proceedings of the 8th International Gas Turbine Conference: The Future of Gas Turbine Technology
Publication Publié, 2016
Publication dans des actes
Résumé : With the increasing share of renewable energy in the total electricity production, the need for flexibility in electrical power production has increased. In some cases, flexibility has even become more important than high efficiency as a primary technology selection criterion. Micro Gas Turbines (mGTs) offer high flexibility for decentralised electricity production due to their limited power output (up to 500 kWe) and operation at variable shaft speed. However, the electrical efficiency of mGTs is rather low (30%). Therefore, mGTs are mainly used in Combined Heat and Power (CHP) applications in which case their total efficiency rises to 80%. In addition, like most CHP plants, mGT operation is mainly heat driven, which has a severe negative effect on the mGT’s flexibility.Humidifying the mGT–converting it into a micro Humid Air Turbine (mHAT)–offers a solution. The waste heat in the exhaust gases is recovered in the mHAT by evaporating auto-raised hot water behind the mGT compressor, resulting in an increased electrical efficiency and a more flexible mGT operation. The mHAT concept combines the high flexibility of the mGT with higher electrical efficiency. In this paper, we present a complete overview of the results of experiments performed on our humidified Turbec T100 mGT over the last three years. As a proof of concept, the mGT at the Vrije Universiteit Brussel has been equipped with a spray saturation tower to humidify the compressed air. The goal of these experiments was to evaluate the beneficial effect of compressed air humidification on the mGT performance at part and nominal load conditions. Stable runs both at constant power and constant rotational speed mode were achieved during water injection experiments. The latest results show a 4.2 percentage point electrical efficiency increase at constant rotational speed