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research-article

EXPERIMENTAL STUDY ON LOW LOAD OPERATION RANGE EXTENSION BY AUTOTHERMAL ON-BOARD SYNGAS GENERATION

[+] Author and Article Information
Max H. Baumgärtner

Lehrstuhl für Thermodynamik Technische Universität München D-85747 Garching Germany
baumgaertner@td.mw.tum.de

Thomas Sattelmayer

Lehrstuhl für Thermodynamik Technische Universität München D-85747 Garching Germany
sattelmayer@td.mw.tum.de

1Corresponding author.

ASME doi:10.1115/1.4040747 History: Received June 25, 2018; Revised June 29, 2018

Abstract

Volatile renewable energy sources induce power supply fluctuations. These need to be compensated by flexible conventional power plants. Gas turbines in combined cycle power plants adjust the power output quickly but their turn-down ratio is limited by the slow reaction kinetics which lead to CO emissions. To extend the turn-down ratio, the fuel can be converted to syngas, which exhibits a higher reactivity. By an increasing fraction of syngas in the fuel, the reactivity of the mixture is increased and total fuel mass-flow and the power output can be reduced. An Autothermal On-board Syngas Generator in combination with two burner concepts for natural gas/syngas mixtures was presented in a previous study [1]. The study at hand shows a mass-flow variation of the reforming process and further improvements of the two burner concepts which result in a more application-oriented operation. The first of the two burner concepts comprises a generic swirl stage with a central lance for syngas injection. Syngas is injected swirled and non-swirled. The second concept includes a central swirl stage with an outer ring of jets. For this burner, syngas is injected in both stages. For both burners, combustion performance is analyzed by OH*-chemiluminescence and gaseous emissions. The lowest possible adiabatic flame temperature without a significant increase of CO emissions was 170K - 210K lower for the syngas compared to low load pure natural gas combustion. This corresponds to a decrease of 15 - 20% in terms of thermal power.

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