The Simulation of Biogas Combustion in A Mild Burner

Noor, M. M.; Wandel, Andrew P.; Yusaf, Talal

doi:10.15282/jmes.6.2014.27.0097

Cited by 42 publications

(31 citation statements)

References 36 publications

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“…The excess methane and pollutant CO occurred at lower lambda but not at higher since all methane consumes leaving excess oxygen. A small but significant amount of oxygen remains at lean conditions, consuming all the CH 4 . This greater consumption of methane produces the higher temperatures.…”

Section: Resultsmentioning

confidence: 99%

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Effect of Air-Fuel Ratio on Temperature Distribution and Pollutants for Biogas Mild Combustion

Noor¹,

Wandel

Yusaf³

2014

Int. J. Automot. Mech. Eng.

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This paper examines the effect of air-fuel ratio for Moderate or Intense Low oxygen Dilution (MILD) combustion using a bluff-body burner. Exhaust gas recirculation was used to dilute the oxidizer stream prior to the combustion chamber. A low-calorie biogas fuel which consists of 60% methane and 40% carbon dioxide were used in the simulations using a Reynolds-averaged Navier-Stokes model with the realizable k-ε turbulence model. The chamber temperature distribution was found to be in small ranges and almost homogeneously distributed, verifying that MILD conditions were attained. The performance was evaluated based on the level of pollutants (Unburned hydrocarbons (UHC) and carbon-mono oxide (CO)) produced and measured in the exhaust gas. Slightly lean conditions produced negligible pollutants with some excess oxygen measured in the exhaust gas. Under rich conditions, UHC and CO were produced, but when synthetic air containing oxygen with a mole fraction of 7% was used as the oxidizer instead of ordinary air, these levels were significantly reduced.

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Section: Resultsmentioning

confidence: 99%

“…Combustion is predicted to be the most important way of generating future energy [1,[3][4][5][6]. Fuel depletion and emission is the main issue to cater this energy need [7,8].…”

Section: Introductionmentioning

confidence: 99%

Effect of Air-Fuel Ratio on Temperature Distribution and Pollutants for Biogas Mild Combustion

Noor¹,

Wandel

Yusaf³

2014

Int. J. Automot. Mech. Eng.

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“…CO2 dissociation, combustion temperature, air to fuel ratio and other parameters could have contrary effects on final CO fraction. We can find more information about the subject of this study in previous papers [43], [44], [45], [46], [47]. Table 3.…”

Section: Validationmentioning

confidence: 99%

Composition and Stoichiometry Effects of Biogas as Fuel in Spark Ignition Engine

Mokrane¹,

Energy²,

Adouane³

et al. 2018

INT. J. AUTOMOT. MECH. ENG.

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The most important advantage of biogas is that one can retrofit easily the conventional combustion engines to be used for the new fuel but remain the problem of pollutant emission. In this paper, the effect of the biogas composition on the emissions of CO and NOx in an SI engine is investigated numerically. Three compositions were studied (CH4:40 %, CO2:60 %), (CH4:50 %, CO2:50 %), (CH4:60 %, CO2:40 %), at equivalence ratio (ϕ) from lean to rich. The non-adiabatic partially premixed combustion model with probability density function (PDF) method and Zimont model of the turbulent flame speed are used. It was found that increasing CO2 in the biogas lowers NOx emissions significantly, whereas, CO was found to be very low, and appears only at high CH4 concentration. A biogas with (CH4:60 %, CO2:40 %), burning at about (ϕ = 0.9), i.e. slightly lean mixture, and advanced spark timing (between 10 to 20°.) seems to be a very a realistic combination in terms of biogas composition, stoichiometry and spark timing. It is recommended that, to accomplish some upgrading, in case of biogases with low CH4 percentage, to get it up to 60 %.

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“…High engine efficiency can be achieved with low NO x and soot emissions. In HCCI combustion, a homogeneous mixture of air and fuel is compressed until auto-ignition occurs near the end of the compression stroke, followed by a combustion process that is significantly faster than either CI or SI combustion [21][22][23][24]. Epping et al [25] and Christensen and Johansson [26] reported that HCCI technology, using iso-octane as a fuel, has improved engine efficiency by as much as 37% given a high compression ratio (18:1) and maintains low emissions levels.…”

Section: Homogeneous Charge Compression Ignition Enginesmentioning

confidence: 99%