Agwu, Ogbonnaya, Runyon, Jon  ORCID: https://orcid.org/0000-0003-3813-7494, Goktepe, Burak, Chong, Cheng T., Ng, Jo-Han, Giles, Anthony ORCID: https://orcid.org/0000-0002-1221-5987 and Valera-Medina, Agustin ORCID: https://orcid.org/0000-0003-1580-7133
2020.
Visualisation and performance evaluation of biodiesel/methane co-combustion in a swirl-stabilised gas turbine combustor.
Fuel
277
, 118172.
10.1016/j.fuel.2020.118172
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Abstract
While dual fuel firing of power generation combustion systems can improve the fuel flexibility of such systems, several studies on compression ignition engines have also shown a positive impact on NOX and PM emissions. Previous multiphase fuel combustion studies for combustion turbines are limited, thus the present study addresses that gap by fuelling a model swirl stabilised gas turbine combustor with a blend of waste cooking oil-derived biodiesel and methane. Methane was increasingly injected into swirling combustion air flow while simultaneously reducing the biodiesel spray flowrate across a pressure atomiser, thus maintaining an overall equivalence ratio of 0.7 while delivering a thermal power output of 15 kW in all cases, except for flame stability range trials. Direct flame imaging, CH* and C2* chemiluminescence imaging, post combustion emissions as well as stability performance of the flames were evaluated. NOX emissions were found to decrease by 29% and unburnt hydrocarbons increased by 10% as the fraction of methane in fuel mix increased to 30%. Further, flame images suggest increased wrinkling and perturbing of the flame front as gas fraction of the biodiesel/methane flame increases. However, the temporal variation of integral intensity of CH* and C2* species chemiluminescence point to at least an 8% improvement in flame stability when 30% of flame heat output is supplied by methane compared to neat biodiesel burn. Also, it was found that flame stability limits reduce as methane partly replaces biodiesel in the flame.
| Item Type: | Article |
|---|---|
| Date Type: | Publication |
| Status: | Published |
| Schools: | Schools > Engineering |
| Publisher: | Elsevier |
| ISSN: | 0016-2361 |
| Date of First Compliant Deposit: | 2 June 2020 |
| Date of Acceptance: | 20 May 2020 |
| Last Modified: | 22 Nov 2024 08:15 |
| URI: | https://orca.cardiff.ac.uk/id/eprint/131847 |
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