NOX reduction and efficiency improvements by means of the Double Fuel HCCI combustion of natural gas–gasoline mixtures

Pipitone, Emiliano; Genchi, Giuseppe

doi:10.1016/j.applthermaleng.2016.04.045

Cited by 25 publications

(8 citation statements)

References 39 publications

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“…Natural gas, of which the major constituent is methane, is now regarded as a promising alternative fuel with excellent prospects owing to its huge quantity, cleaner emissions and high thermal efficiency [1][2][3]. In order to reduce the emissions and to improve engine performance, combining hydrogen-natural gas blending fuel with exhaust gas recirculation (EGR) [4][5][6][7][8] is a feasible approach. However, the addition of EGR has a certain impact on combustion.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Initial Conditions on the Laminar Burning Characteristics of Natural Gas Diluted by CO2

et al. 2019

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The initial conditions such as temperature, pressure and dilution rate can have an effect on the laminar burning velocity of natural gas. It is acknowledged that there is an equivalent effect on the laminar burning velocity between any two initial conditions. The effects of initial temperatures (323 K-423 K), initial pressures (0.1 MPa-0.3 MPa) and dilution rate (0-16%, CO 2 as diluent gas) on the laminar burning velocity and the flame instability were investigated at a series of equivalence ratios (0.7-1.2) in a constant volume chamber. A chemical kinetic simulation was also conducted to calculate the laminar burning velocity and essential radicals' concentrations under the same initial conditions. The results show that the laminar burning velocity of natural gas increases with initial temperature but decreases with initial pressure and dilution rate. The maximum concentrations of H, O and OH increase with initial temperature but decrease with initial pressure and dilution rate. Laminar burning velocity is highly correlated with the sum of the maximum concentration of H and OH.

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Section: Introductionmentioning

confidence: 99%

The Effect of Initial Conditions on the Laminar Burning Characteristics of Natural Gas Diluted by CO2

et al. 2019

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“…However, current diesel tailpipe emission limits are highly strict and pose a significant challenge for their widespread usage on land transportation [1]. Engine producers constantly search new onengine techniques (renewable energy, advanced combustion methods) to minimize engine-out emission rates [2][3][4]. Although those methods have a significant potential to reduce emission rates, they either cause fuel inefficiency or cannot satisfactorily curb harmful pollutants at some loads.…”

Section: Introductionmentioning

confidence: 99%

Improving Exhaust Temperature Management At Low-loaded Diesel Engine Operations Via Internal Exhaust Gas Recirculation

Başaran¹

2019

deufmd

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ÖzModern karayolu otomotiv araçları sıkı emisyon yönetmeliklerini karşılamak için genellikle egzoz arıtım sistemleri (EAS) kullanmaktadırlar. Bu sistemler emisyon oranlarını azaltmada çoğu zaman etkili olsa da, düşük-yüklerde düşük egzoz sıcaklıkları (250 o C'nin altında) yüzünden etkisiz olmaktadırlar. Bu çalışma, bir dizel motor modeli üzerinde, egzoz sıcaklıklarının düşük yüklerde iç egzoz gazı devridaimi (İEGD) metoduyla 250 o C'nin üzerine çıkarılabileceğini göstermektedir. Motor sistemi 1700 devir/dakika hızda ve 2,5-4,5 bar fren ortalama efektif basınç motor yükleri arasında çalışmaktadır. İEGD silindir-içi sıcak artık egzoz gazı miktarını arttırmakta ve bu yüzden önemli bir egzoz sıcaklığı artışına (70 o C'ye kadar) sebep olmaktadır. Daha sıcak egzoz sistemi, EAS emisyon dönüşüm verimini çoğunlukla % 90'ın üstünde tutar ve arttırılan ısı transfer oranlarıyla (% 142'ye kadar) EAS katalizör yatağının daha hızlı ısınmasını sağlar. İEGD geleneksel EAS ısıtma teknikleri kadar yakıt tüketici değildir ve yakıt tüketimi artışını % 5'in altında tutabilmektedir. AbstractModern on-road automotive vehicles mostly utilize exhaust after-treatment (EAT) systems to meet the stringent emission regulations. Although those systems are generally effective to reduce emission rates, they are ineffectual at low loads due to low exhaust temperatures (below 250 o C). This study demonstrates on a diesel engine model that exhaust temperatures can be increased above 250 o C at light loads through internal exhaust gas recirculation (IEGR) method. Engine system operates at 1700 RPM engine speed and within 2.5-4.5 bar brake mean effective pressure (BMEP) engine loads. IEGR increases the amount of in-cylinder hot residual exhaust gas and thus causes a considerable exhaust temperature rise (up to 70 o C). Warmer exhaust system keeps EAT emission conversion efficiency mostly above 90 % and accelerates EAT catalyst bed warm-up through increased (up to 142 %) heat transfer rates. IEGR is not as fuel-consuming as conventional EAT warming techniques and can keep the fuel consumption rise below 5 %.

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“…The significantly large proven reserves of natural gas (200 trillion cubic meters worldwide) combined with the capability to operate a cleaner and more efficient cycle make it an attractive alternative fuel [5]. The use of natural gas as a standalone fuel, or as a blend with diesel or hydrogen, has been extensively studied in traditional spark ignition engines [6][7][8][9] and more advanced cycles such as homogeneous charge compression ignition (HCCI) [10][11][12][13][14] and reactivity controlled compression ignition (RCCI) [15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Implementing Natural Gas in a Compression Ignition Cycle Using Noble Gas Addition

Shahsavan¹,

Morovatiyan²,

Baghirzade³

et al. 2019

Preprint

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Natural gas is known as a relatively clean fossil fuel due to its low carbon to hydrogen ratio compared to other transportation fuels, which yields a reduction of carbon monoxide, carbon dioxide, and unburned hydrocarbons emissions. However, it has a low cetane number, which makes it a difficult fuel for use in compression ignition engines. A potential solution for this issue can be adding small amounts of argon, as a noble gas with a low specific heat to modify the intake conditions. In this numerical study, a commercial compression ignition engine has been modeled to evaluate the auto-ignition of natural gas with the modified intake conditions. Different amounts of argon added to the intake air are examined in order to attain the optimal operating conditions. A detailed chemistry solver is implemented on a 53-species chemical kinetics mechanism to calculate the rate constants. The results show that compression ignition of natural gas can be achieved by adding small amounts of argon to the intake air. It drastically increases the in-cylinder temperature and pressure near TDC, which enables the auto-ignition of the injected natural gas. Moreover, it leads to the reduction in ignition delay and heat release rate, and expands the combustion duration. Emissions analysis indicates that NOx and CO2 can be significantly diminished by increasing the amount of argon in the intake composition. This study introduces an efficient and clean compression ignition engine fueled with natural gas running in optimal operating conditions using argon addition to the intake.

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NOX reduction and efficiency improvements by means of the Double Fuel HCCI combustion of natural gas–gasoline mixtures

Cited by 25 publications

References 39 publications

The Effect of Initial Conditions on the Laminar Burning Characteristics of Natural Gas Diluted by CO2

The Effect of Initial Conditions on the Laminar Burning Characteristics of Natural Gas Diluted by CO2

Improving Exhaust Temperature Management At Low-loaded Diesel Engine Operations Via Internal Exhaust Gas Recirculation

Implementing Natural Gas in a Compression Ignition Cycle Using Noble Gas Addition

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