Effects of internal exhaust gas recirculation on controlled auto-ignition in a methane engine combustion

Cho, Gyubaek; Moon, Gun-Feel; Jeong, Dong Seop; Bae, Choongsik

doi:10.1016/j.fuel.2008.10.042

Cited by 13 publications

(7 citation statements)

References 18 publications

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“…Such combustion is termed "volumetric" combustion. The volumetric combustions of gas fuel and liquid fuel have been reported for conditions of High Temperature Air Combustion (HiTAC) [10][11][12], or flameless oxidation, the importance of extensive flue gas recirculation in the combustion and formation of so-called "flameless" combustion in industrial furnaces has been reported [13]. Volumetric combustion has also been used for oxygen enriched and oxy-fuel combustion air [14].…”

Section: Concept Of Volumetric Combustionmentioning

confidence: 99%

Volumetric combustion of biomass for CO2 and NOx reduction in coal-fired boilers

Jun

Yang

Blasiak

et al. 2012

Fuel

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To meet the urgent environmental targets, substituting coal with biomass has been considered to be an effective and promising method over the last decades. In this paper, a new concept of volumetric combustion is proposed and further developed to achieve 100% fuel switching to biomass in large scale coal-fired boilers. Volumetric combustion not only changes the in-furnace flow but also affects the combustion reactions by the intensive mixing and internal recirculation of the flue gases. Firstly, the volumetric combustion properties of the wood pellets were investigated experimentally. An Aspen model was then used to thermodynamically describe and study the volumetric combustion with three different types of fuel, and the emission properties of CO 2 and NOx were compared. Finally, two applications of volumetric combustion were discussed. It is concluded that the wood pellets ignited and combusted much faster than the coal pellets and had a larger combustion volume when combusted under lower oxygen concentration conditions, and the ignition time was almost independent of the oxygen concentration when the oxidizer was preheated to 1000°C. In addition, the NOx emissions decreased as the recirculation ratio of the flue gas increased, and as the percentage of biomass used in co-firing increased, the amount of flue gas that needs to be recycled for reduction of NOx decreased. Thus, the volumetric combustion is beneficial as it reduces the operation cost of NOx reduction. The volumetric combustion would be an attractive technology for co-firing a large proportion of biomass in coal-fired boilers with high boiler efficiency and effective emissions reduction.

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Section: Concept Of Volumetric Combustionmentioning

confidence: 99%

Volumetric combustion of biomass for CO2 and NOx reduction in coal-fired boilers

Jun

Yang

Blasiak

et al. 2012

Fuel

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“…In single-cylinder or multi-cylinder engines, it is very difficult to control the combustion, because parameters are coupled with each other under engine operating conditions. For this reason, the use of a rapid compression machine (RCM) allows to elucidate about combustion characteristics and visualize combustion phenomena [10][11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Syngas Application to Spark Ignition Engine Working Simulations by Use of Rapid Compression Machine

Monteiro¹,

Bellenoue²,

Sottton³

et al. 2012

Internal Combustion Engines

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“…Therefore, in-cylinder pressure values obtained from this numerical study may be validated by comparing with some experimental studies. For this purpose, we considered the investigation of Cho et al [4],studied on rapid intake compression and exhaust machine at compression ratio of 11.7 to determine the effect of internal EGR rate on CAI in methane engine combustion. Fig.…”

Section: Model Validationmentioning

confidence: 99%

“…However, CAI/HCCI combustion restricts the range of engine operation conditions due to its characteristics, rapid heat release and challenges of the autoignition timing control, while having the potential for lower NOx emission and improved thermal efficiency at certain operating conditions. In order to cope with limited operation range (knocking, misfire, partial burn), various methods such as heating intake air, higher compression ratio, more auto-ignitable fuel and exhaust gas recirculation [3], [4], [5] have been used. Among these methods, the exhaust gas recirculation method provided by exhaust gas rebreathing, in which exhaust gas is trapped by means of using a negative valve overlap strategy [6], [7], [8], [9] seems to be the most practical and effective way without modification of the compression ratio, heating intake air [10].…”

Section: Introductionmentioning

confidence: 99%

Computational Study of EGR and Excess Air Ratio Effects on a Methane Fueled CAI Engine

Yıldız

Akansu

Çeper

2015

IJAET

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This paper presents the numerical analysis of a controlled auto ignition (CAI), four stroke, single cylinder engine, by using methane fuel. The goal of this study was to determine how exhaust gas recirculation (EGR) rate affects combustion, emission and engine performance. The EGR rates were selected as 27 %, 32 %, 37 %, and 42 % by mass with excess air ratios of 1.0, 1.5, 2.0, and 2.5. An incylinder temperature of 570 K was considered at intake valve closing time (IVC) and an engine speed of 1500 rpm was used for all cases. The Computational Fluid Dynamics (CFD) code FLUENT was used for numerical analysis. The numerical modeling was solved by taking into consideration the effect of turbulence, by using the Renormalization Group Theory (RNG) k- model. The results indicate that increase in EGR rate and excess air ratio have significant effects on in-cylinder pressure, temperature, heat release rate, pressure rise rate, combustion duration, brake work, specific NOx and CO emissions, thermal efficiency and specific fuel consumption. Moreover, CAI combustion resulted in a rapid heat release rate which gives rise to an increase in the pressure rise rate, high temperature value and high level SNOx emission, when EGR rate was low level (up to 32 %) for excess air ratio() value of 1 and 1.5. To achieve CAI combustion resulting in low level SNOx emission, the mixture must include an EGR rate of more than 32 % or become leaner.

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Effects of internal exhaust gas recirculation on controlled auto-ignition in a methane engine combustion

Cited by 13 publications

References 18 publications

Volumetric combustion of biomass for CO2 and NOx reduction in coal-fired boilers

Volumetric combustion of biomass for CO2 and NOx reduction in coal-fired boilers

Syngas Application to Spark Ignition Engine Working Simulations by Use of Rapid Compression Machine

Computational Study of EGR and Excess Air Ratio Effects on a Methane Fueled CAI Engine

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