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research-article

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:10.1115/1.4038016 History: Received July 20, 2017; Revised July 26, 2017

Abstract

The increasing amount of renewable energy sources drives the necessity of flexible conventional power plants to compensate for power supply fluctuations. Gas turbines in combined cycle power plants (CCPPs) adjust power output quickly but a sudden increase of CO and UHC emissions limit their turn-down ratio. To extend the turn-down ratio, part of the fuel can be processed to syngas, which exerts a higher reactivity. An autothermal on-board syngas generator in combination with two different burner concepts for natural gas and syngas mixtures are presented here. A mixture of natural gas, water vapor and air reacts catalytically in an autothermal reactor test rig to syngas. At atmospheric pressure, the fuel processor generates syngas with a hydrogen content of 30 vol-% and a temperature of 800 K within a residence time of 200 ms. One concept for the combustion of natural gas/syngas mixtures comprises a generic swirl stage with a central lance injector for the syngas. The second concept includes a central swirl stage with a ring of jets. Both concepts are analyszed by OH*-chemiluminescence, lean blow out (LBO) limit and gaseous emissions. The central lance concept with syngas injection exhibits an LBO adiabatic flame temperature that is 150 K lower than in premixed natural gas operation. For the second concept an extension of 200 K with low CO emission levels can be reached. This study shows that autothermal on-board syngas generation is efficient in terms of turn-down ratio extension and CO burn-out.

Copyright (c) 2017 by ASME
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