Effect of hydrogen addition in diesel/natural gas dual-fuel combustion with late injection

In a previous work, the effectiveness of late pilot injection on improving combustion behaviour – in terms of fuel conversion efficiency and pollutant emission levels – in a diesel/natural gas dual-fuel engine was assessed. Then, an additional set of experiments was performed, aiming at speeding up...

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Autores principales:	Caricato Antonio, Carlucci Antonio Paolo, Ficarella Antonio, Strafella Luciano
Formato:	article
Lenguaje:	EN FR
Publicado:	EDP Sciences 2021
Materias:	Environmental sciences GE1-350
Acceso en línea:	https://doaj.org/article/0349f4002be04926badc02be91297f2f
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spelling	oai:doaj.org-article:0349f4002be04926badc02be91297f2f2021-11-08T15:18:51ZEffect of hydrogen addition in diesel/natural gas dual-fuel combustion with late injection2267-124210.1051/e3sconf/202131208005https://doaj.org/article/0349f4002be04926badc02be91297f2f2021-01-01T00:00:00Zhttps://www.e3s-conferences.org/articles/e3sconf/pdf/2021/88/e3sconf_ati2021_08005.pdfhttps://doaj.org/toc/2267-1242In a previous work, the effectiveness of late pilot injection on improving combustion behaviour – in terms of fuel conversion efficiency and pollutant emission levels – in a diesel/natural gas dual-fuel engine was assessed. Then, an additional set of experiments was performed, aiming at speeding up the combustion process possibly without penalizing NOx levels. Therefore, hydrogen was added to natural gas in a percentage equal to 10%. Results show that hydrogen addition has a significant effect on the combustion development specially during the early stage of combustion: ignition delay is shortened and combustion centre is advanced, while the combustion duration increases when pilot injection timing is set to conventional values, while remains basically unchanged for late timings. Fuel conversion efficiency is only slightly penalized when hydrogen is added. Moreover, it was confirmed that, in general, combustion strategy with late pilot injection timing does not penalize fuel conversion efficiency; indeed, in some cases, it actually increases. Concerning regulated emission levels, it is again proven that late pilot injection does not penalize pollutant production: the hydrocarbons and carbon monoxide reduce as pilot injection is delayed, probably due to the higher temperatures reached into the cylinder during most part of the expansion stroke. Moreover, adding hydrogen always reduces their levels. Concerning NOx, they are drastically reduced delaying pilot injection; as expected, hydrogen addition promotes NOx formation, but the increase, evident with conventional pilot injection timings, becomes marginal with late injection strategy. Therefore, combustion strategy performance with late pilot injection in dual-fuel diesel/natural gas combustion conditions can be further improved with 10% hydrogen addition to natural gas.Caricato AntonioCarlucci Antonio PaoloFicarella AntonioStrafella LucianoEDP SciencesarticleEnvironmental sciencesGE1-350ENFRE3S Web of Conferences, Vol 312, p 08005 (2021)
institution	DOAJ
collection	DOAJ
language	EN FR
topic	Environmental sciences GE1-350
spellingShingle	Environmental sciences GE1-350 Caricato Antonio Carlucci Antonio Paolo Ficarella Antonio Strafella Luciano Effect of hydrogen addition in diesel/natural gas dual-fuel combustion with late injection
description	In a previous work, the effectiveness of late pilot injection on improving combustion behaviour – in terms of fuel conversion efficiency and pollutant emission levels – in a diesel/natural gas dual-fuel engine was assessed. Then, an additional set of experiments was performed, aiming at speeding up the combustion process possibly without penalizing NOx levels. Therefore, hydrogen was added to natural gas in a percentage equal to 10%. Results show that hydrogen addition has a significant effect on the combustion development specially during the early stage of combustion: ignition delay is shortened and combustion centre is advanced, while the combustion duration increases when pilot injection timing is set to conventional values, while remains basically unchanged for late timings. Fuel conversion efficiency is only slightly penalized when hydrogen is added. Moreover, it was confirmed that, in general, combustion strategy with late pilot injection timing does not penalize fuel conversion efficiency; indeed, in some cases, it actually increases. Concerning regulated emission levels, it is again proven that late pilot injection does not penalize pollutant production: the hydrocarbons and carbon monoxide reduce as pilot injection is delayed, probably due to the higher temperatures reached into the cylinder during most part of the expansion stroke. Moreover, adding hydrogen always reduces their levels. Concerning NOx, they are drastically reduced delaying pilot injection; as expected, hydrogen addition promotes NOx formation, but the increase, evident with conventional pilot injection timings, becomes marginal with late injection strategy. Therefore, combustion strategy performance with late pilot injection in dual-fuel diesel/natural gas combustion conditions can be further improved with 10% hydrogen addition to natural gas.
format	article
author	Caricato Antonio Carlucci Antonio Paolo Ficarella Antonio Strafella Luciano
author_facet	Caricato Antonio Carlucci Antonio Paolo Ficarella Antonio Strafella Luciano
author_sort	Caricato Antonio
title	Effect of hydrogen addition in diesel/natural gas dual-fuel combustion with late injection
title_short	Effect of hydrogen addition in diesel/natural gas dual-fuel combustion with late injection
title_full	Effect of hydrogen addition in diesel/natural gas dual-fuel combustion with late injection
title_fullStr	Effect of hydrogen addition in diesel/natural gas dual-fuel combustion with late injection
title_full_unstemmed	Effect of hydrogen addition in diesel/natural gas dual-fuel combustion with late injection
title_sort	effect of hydrogen addition in diesel/natural gas dual-fuel combustion with late injection
publisher	EDP Sciences
publishDate	2021
url	https://doaj.org/article/0349f4002be04926badc02be91297f2f
work_keys_str_mv	AT caricatoantonio effectofhydrogenadditionindieselnaturalgasdualfuelcombustionwithlateinjection AT carlucciantoniopaolo effectofhydrogenadditionindieselnaturalgasdualfuelcombustionwithlateinjection AT ficarellaantonio effectofhydrogenadditionindieselnaturalgasdualfuelcombustionwithlateinjection AT strafellaluciano effectofhydrogenadditionindieselnaturalgasdualfuelcombustionwithlateinjection
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Effect of hydrogen addition in diesel/natural gas dual-fuel combustion with late injection

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