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Exhaust gas recirculation with highly oxygenated fuels in gas turbines
Rosec, Žiga (Author), Žvar Baškovič, Urban (Author), Katrašnik, Tomaž (Author), Seljak, Tine (Author)

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Abstract
To achieve a near zero emission footprint of combustion in power generation, introduction of fuels with low global warming potential, namely low-carbon or carbon neutral fuels and simultaneous reduction of harmful emissions through implementation of advanced combustion concepts is necessary. The study addresses this challenge experimentally by proposing a new approach which combines the benefits of highly oxygenated waste derived fuels, here represented by glycerol, and an introduction of external exhaust gasses recirculation (EGR) aimed for further reduction of NOx emissions. Thus, the recognized role of the high oxygen content in glycerol can positively influence the well-known penalties of EGR, which are commonly perceivable through elevated CO and soot emissions. The measurements were performed with an experimental gas turbine equipped with an exhaust heat regeneration system and feedback loop for 8% and 13% EGR content in compressor intake air. The proposed system layout represents a technically viable and cost-efficient approach for upgrading existent gas turbine setups with a goal to improve their emission footprint. Results confirm that with 8% and 13% EGR rate, NO [sub] x, CO and soot can be reduced simultaneously, thus improving the CO- NO [sub] x and soot- NO [sub] x trade off approximately 2-fold for each species. Additionally, underlying phenomena responsible for observed improvements while increasing EGR rate are identified as an increased soot reactivity, a competing effect of EGR related dilution and an increased primary air temperature together with spray related parameters linked to low stoichiometric ratio of glycerol.

Language:English
Keywords:oxygenated fuel, exhaust gas recirculation, biofuel, particulate matter, gas turbine, advanced combustion concepts
Work type:Article (dk_c)
Tipology:1.01 - Original Scientific Article
Organization:FS - Faculty of Mechanical Engineering
Year:2020
Submitted for review:24.05.2020
Article acceptance date:29.05.2020
Article publication date:15.10.2020
Number of pages:Str. 1-12
Numbering:Vol. 278, art. 118285
UDC:621.438(045)
ISSN on article:0016-2361
DOI:10.1016/j.fuel.2020.118285 This link opens in a new window
COBISS.SI-ID:20033539 This link opens in a new window
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Downloads:12
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Record is a part of a journal

Title:Fuel
Shortened title:Fuel
Publisher:Elsevier
ISSN:0016-2361
COBISS.SI-ID:37399 This link opens in a new window

Document is financed by a project

Funder:ARRS - Agencija za raziskovalno dejavnost Republike Slovenije (ARRS)
Project no.:P2-0401
Name:Energetsko strojništvo

Funder:ARRS - Agencija za raziskovalno dejavnost Republike Slovenije (ARRS)
Project no.:Z2-1862
Name:Zgorevanje brez okoljskega odtisa za proizvodnjo zelene energije

Funder:Drugi - Drug financer ali več financerjev
Project no.:802-7/2019
Name:Young researcher program

Secondary language

Language:Slovenian
Keywords:oksigenirana goriva, recirkulacija izpušnih plinov, biogorivo, izpusti delcev, plinska turbina, napredni koncepti zgorevanja

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