Combustion of Hydrogen Enriched Methane and Biogases Containing Hydrogen in a Controlled Auto-Ignition Engine

Mariani, Antonio; Unich, Andrea; Minale, Mario

doi:10.3390/app8122667

Cited by 15 publications

(11 citation statements)

References 39 publications

(40 reference statements)

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“…engines [51,116,117]. The studies pointed out that, at constant initial temperature, hydrogen promotes ignition, which then occurs earlier, as a consequence of higher chemical reactivity.…”

Section: Effect Of Hydrogen Addition On the Laminar Burning Velocity ...mentioning

confidence: 99%

“…This process involves laborious, costly, and time-consuming work, therefore CO 2 removal can be replaced by the addition of hydrogen especially in some internal combustion engines which use biogas as fuel. Studies on combustion of hydrogen enriched methane and biogas were conducted in internal combustion engines [51,116,117]. The studies pointed out that, at constant initial temperature, hydrogen promotes ignition, which then occurs earlier, as a consequence of higher chemical reactivity.…”

Section: Effect Of Hydrogen Addition On the Laminar Burning Velocity ...mentioning

confidence: 99%

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Laminar Burning Velocity of Biogas-Containing Mixtures. A Literature Review

et al. 2021

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Currently, the use of fossil fuels is very high and existing nature reserves are rapidly depleted. Therefore, researchers are turning their attention to find renewable fuels that have a low impact on the environment, to replace these fossil fuels. Biogas is a low-cost alternative, sustainable, renewable fuel existing worldwide. It can be produced by decomposition of vegetation or waste products of human and animal biological activity. This process is performed by microorganisms (such as methanogens and sulfate-reducing bacteria) by anaerobic digestion. Biogas can serve as a basis for heat and electricity production used for domestic heating and cooking. It can be also used to feed internal combustion engines, gas turbines, fuel cells, or cogeneration systems. In this paper, a comprehensive literature study regarding the laminar burning velocity of biogas-containing mixtures is presented. This study aims to characterize the use of biogas as IC (internal combustion) engine fuel, and to develop efficient safety recommendations and to predict and reduce the risk of fires and accidental explosions caused by biogas.

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“…engines [51,116,117]. The studies pointed out that, at constant initial temperature, hydrogen promotes ignition, which then occurs earlier, as a consequence of higher chemical reactivity.…”

Section: Effect Of Hydrogen Addition On the Laminar Burning Velocity ...mentioning

confidence: 99%

Section: Effect Of Hydrogen Addition On the Laminar Burning Velocity ...mentioning

confidence: 99%

Laminar Burning Velocity of Biogas-Containing Mixtures. A Literature Review

et al. 2021

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“…It was already proven that fuelling a CAI engine with hydrogen enriched methane contributes to reduce NOx emissions, essentially because the intake gas temperature, controlled with EGR, is lower than what is required for the auto-ignition of pure methane [36]. Furthermore, a preliminary simplified analysis, where the intake gas temperature is considered as a parameter of the problem, confirmed the NOx emissions reduction also when a CAI engine is fuelled with biogases made of methane, carbon dioxide and hydrogen [37]. Aim of this paper is the investigation of the effects on CAI engine performance and NOx emissions of the use of innovative biogases made of CH4, H2 and CO2, adopting EGR for controlling auto-ignition and combustion phasing.…”

Section: Introductionmentioning

confidence: 91%

EGR Strategy for NOx Emission Reduction in a CAI Engine Fuelled with Innovative Biogas

Mariani¹,

Unich²,

Minale³

2019

IJES

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Gaseous fuel utilization reduces pollutant emissions and makes thermal energetic systems less dependent on oil. Their carbon content is low, which means low CO2 emissions, and a lower cost with respect to conventional fuels. If gaseous fuels have a non-fossil origin, their adoption would have a beneficial impact on global CO2 balance and on the dependence of the energy sector from fossil fuels. Biogas is produced from the anaerobic digestion of organic materials, with the composition depending on the feedstock and on the production processes. The use of biogas in internal combustion engines (ICE) is very attractive. However, the presence in the biogas of an inert gas like CO2 has adverse effects on combustion, reducing combustion speed, narrowing flammability limits with harmful effects on combustion stability. A possible way for improving combustion performance of biogas is hydrogen addition. Innovative anaerobic digestion processes, which maximize the H2 yield, can end up with biogases made of CH4, CO2 and H2. The biogas, generally adopted as fuel in positive ignition ICEs, is also suitable for Controlled Auto Ignition (CAI) engines. Aim of this work is to investigate the biogas combustion in CAI ICE by means of numerical simulations. The effect of fuel composition and EGR on engine performance and exhaust emissions was evaluated. Authors compared conventional and innovative biogases composed by CH4, CO2 and H2 of different compositions. CAI systems are controlled with varying intake gas conditions: air-fuel ratio, boost pressure and charge temperature. The temperature depends on recycled exhaust gas content, which has an impact on the combustion process. Authors investigated the effect that EGR has on the in-cylinder gas temperature and reaction mechanism, focusing on NOx emission formations.

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“…The use of such gas mixtures as fuels is investigated with regard to combustion and operation of furnaces and engines [1,2]. In addition, also the questions referring to the storage of these gas mixtures should be addressed.…”

Section: Introductionmentioning

confidence: 99%

Adsorbed Renewable Energy Gas Storage

Klepp¹

2021

Atlantis Highlights in Engineering

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Gases like hydrogen and gas mixtures like biogas are an important renewable energy resource. For storing, the gas is compressed and transferred to pressure vessels A sustainable and effective alternative is the adsorption of the gas by porous media. Adsorbed gas storage is of particular relevance for vehicles, where the fuel storage volume is limited. The storage performance of activated carbon beds for methane, carbon dioxide, hydrogen and the binary mixtures with methane is investigated. A lumped parameter model is used to describe composition, pressure, mean temperature and flow rate. The Dubinin-Astakhov isotherm is used to describe the adsorbed amount at different temperatures and pressures. The resulting set of transient differential equations is solved numerically. The charging process with regard to filling time and temperature is examined. The discharge process with regard to discharge rate, concentration and temperature is investigated. The charge and discharge time are significantly influenced by the heat of adsorption. For the outlet flow the composition of the gas mixture changes over time.

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Combustion of Hydrogen Enriched Methane and Biogases Containing Hydrogen in a Controlled Auto-Ignition Engine

Cited by 15 publications

References 39 publications

Laminar Burning Velocity of Biogas-Containing Mixtures. A Literature Review

Laminar Burning Velocity of Biogas-Containing Mixtures. A Literature Review

EGR Strategy for NOx Emission Reduction in a CAI Engine Fuelled with Innovative Biogas

Adsorbed Renewable Energy Gas Storage

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