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research-article

Micro Gas turbine Cycle Humidification for Increased Flexibility: Numerical and Experimental Validation of Different Steam Injection Models

[+] Author and Article Information
Ward De Paepe

University of Mons (UMONS), Thermal Engineering and Combustion Unit, Faculty of Engineering, Place du Parc 20, 7000 Mons, Belgium
Ward.DEPAEPE@umons.ac.be

Massimiliano Renzi

Free University of Bozen/Bolzano, Faculty of Science and Technology, Piazza Università 1, Bolzano 39100 Italy
massimiliano.renzi@unibz.it

Marina Montero Carrero

Vrije Universiteit Brussel (VUB), Thermo and Fluid dynamics (FLOW), Faculty of Engineering, 1050 Brussel, Belgium
mmontero@vub.ac.be

Carlo Caligiuri

Free University of Bozen/Bolzano, Faculty of Science and Technology, Piazza Università 1, Bolzano 39100 Italy
carlo.caligiuri@natec.unibz.it

Francesco Contino

Vrije Universiteit Brussel (VUB), Thermo and Fluid dynamics (FLOW), Faculty of Engineering, Pleinlaan 2, 1050 Brussels, Belgium
fcontino@vub.ac.be

1Corresponding author.

ASME doi:10.1115/1.4040859 History: Received June 27, 2018; Revised July 06, 2018

Abstract

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 technology must become more flexible in terms of operation and in terms of fuel utilization. Cycle humidification is a possible route to handle these problems. Current simulation models can correctly assess the impact of humidification on the cycle performance, but they fail to provide detailed information on the combustion process. To fully quantify the potential of cycle humidification, more advanced numerical models are necessary, capable of handling the complex chemical kinetics in the combustor. In this paper, we compared and validated such a model (in-house MATLAB model) with a typical steady-state model (Aspen Plus) of the steam injected mGT based on the Turbec T100. Both models were compared considering steam injection in the compressor outlet or in the combustor, focussing only on the global cycle performance. Simulation results showed some differences between the models; however, the general trends observed are consistent. Additionally, the numerical results of the injection in the compressor outlet were validated with steam injection experiments, indicating that the MATLAB model overestimates the efficiency improvement by 25% to 45%. The results show the potential of simulating the humidified cycle using more advanced models; however, in future work, special attention should be paid to the experimental tuning of the model parameters in general and the recuperator in particular.

Copyright (c) 2018 by ASME
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