An Experimental Investigation on the Combustion and Emissions Performance of a Natural Gas–Diesel Dual Fuel Engine at Low and Medium Loads

Guo, Hongsheng; Neill, W. Stuart; Liko, Brian

doi:10.1115/icef2015-1041

Cited by 19 publications

(5 citation statements)

References 13 publications

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“…The schematic of the experimental setup and basic engine configuration can be found elsewhere. 23 Natural gas was injected into the intake port by a fuel injection manifold. The diesel was directly injected into the cylinder by a prototype common rail fuel injector system.…”

Section: Test Engine and Test Conditionsmentioning

confidence: 99%

Effect of fuel composition on properties of particles emitted from a diesel–natural gas dual fuel engine

Momenimovahed

Liu

Thomson

et al. 2019

International Journal of Engine Research

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The effective density and mixing state of particles emitted from a natural gas–diesel dual fuel engine are investigated. Measurements were conducted at three different fuel compositions including 100% diesel fuel (0% NG), 75% diesel–25% natural gas (25% NG) and 50% diesel–50% NG (50% NG). The particle effective density was measured using a differential mobility analyzer in series with a centrifugal particle mass analyzer. A catalytic stripper at 350 °C was employed upstream of the centrifugal particle mass analyzer in order to remove the semi-volatile material from the solid particles to measure the effective density of non-volatile particles as well as the particle mixing state. A scanning mobility particle sizer was used to measure the particle size distribution. The particle mass concentration was also measured using several techniques including cavity-attenuated phase-shift particulate matter single-scattering albedo, laser-induced incandescence, thermal-optical analysis, photoacoustic spectroscopy, and integrated particle size distribution. The semi-volatile number and mass fractions are found to be lower than 15%. The effective density functions of particles at 0% and 25% NG are within 6% of each other; however, the effective density values of particles at 50% NG are lower than those of the 0% NG by up to 35%. The mass-mobility exponent varies in the range of 2.42–2.51 and 2.38–2.54 for undenuded and denuded particles, respectively. For the mass concentration measurements, photoacoustic spectroscopy agrees with thermal-optical analysis within 5%, while all the other techniques measure up to 50% deviations relative to thermal-optical analysis.

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Section: Test Engine and Test Conditionsmentioning

confidence: 99%

Effect of fuel composition on properties of particles emitted from a diesel–natural gas dual fuel engine

Momenimovahed

Liu

Thomson

et al. 2019

International Journal of Engine Research

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“…Several studies on dual-fuel diesel engines have been carried out using various parameters such as variation of the timing [6] and duration of CNG injection [7], optimization of pilot injection timing [8][9] [10], and enhance air mass flow rate to the intake manifold [11]. Basically, the timing and duration of CNG injection can affect the combustion process, this is related to the quantity of CNG fuel that enters the combustion chamber during the intake stroke.…”

Section: Introductionmentioning

confidence: 99%

Performance and Combustion Process of a Dual Fuel Diesel Engine Operating with CNG-Palm Oil Biodiesel

Trihatmojo¹,

Sudarmanta

Muraza

2023

jrtt

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Efforts to build and develop a low-emission transportation system have been carried out, one of which is by applying biodiesel and gas to dual-fuel diesel engines. Biodiesel is an oxygenated, low-sulfur, and high flash point alternative diesel fuel. In the dual fuel mode, CNG is used as a substitute fuel and palm biodiesel as a combustion pilot which is injected directly into the combustion chamber at 13 °CA BTDC. CNG injection timing was 110 °CA ATDC and the CNG injection duration was gradually increased. Performance and combustion processes in single-fuel mode and dual-fuel mode are compared. The engine was kept at a constant speed of 2000 rpm at all load conditions. The results show that the dual fuel mode at low and medium loads produces in-cylinder pressure and the heat release rate is lower than the single fuel mode, but at high loads, it produces in-cylinder pressure and the heat release rate is 5.14% greater. CO and HC emissions produced by the dual fuel mode are higher than the single fuel mode at all loads. conversely, the dual-fuel mode produces 95.58% lower smoke emissions than the single-fuel mode at all loads.

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“…Guo, et al [12] investigated the combustion and emissions performance of the diesel pilot natural gas engines in a range of loads and speeds varying from low to medium loads. In their work, as the natural gas substitution ratio was increased, a pilot injection timing sweep was conducted.…”

Section: Introductionmentioning

confidence: 99%

Experimental Studies of Low-Load Limit in a Stoichiometric Micro-Pilot Diesel Natural Gas Engine

Vinhaes

McTaggart-Cowan

Munshi³

et al. 2022

Energies

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While operating at light loads, diesel pilot-ignited natural gas engines with lean premixed natural gas suffer from poor combustion efficiency and high methane emissions. This work investigates the limits of low-load operation for a micro-pilot diesel natural gas engine that uses a stoichiometric mixture to enable methane and nitrogen oxide emission control. By optimizing engine hardware, operating conditions, and injection strategies, this study focused on defining the lowest achievable load while maintaining a stoichiometric equivalence ratio and with acceptable combustion stability. A multi-cylinder diesel 6.7 L engine was converted to run natural gas premix with a maximum diesel micro-pilot contribution of 10%. With a base diesel compression ratio of 17.3:1, the intake manifold pressure limit was 80 kPa(absolute). At a reduced compression ratio of 15:1, this limit increased to 85 kPa, raising the minimum stable load. Retarding the combustion phasing, typically used in spark-ignition engines to achieve lower loads, was also tested but found to be limited by degraded diesel ignition at later timings. Reducing the pilot injection pressure improved combustion stability, as did increasing pilot quantity at the cost of lower substitution ratios. The lean operation further reduced load but increased NOx and hydrocarbon emissions. At loads below the practical dual-fuel limit, a transition to lean diesel operation will likely be required with corresponding implications for the aftertreatment system.

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An Experimental Investigation on the Combustion and Emissions Performance of a Natural Gas–Diesel Dual Fuel Engine at Low and Medium Loads

Cited by 19 publications

References 13 publications

Effect of fuel composition on properties of particles emitted from a diesel–natural gas dual fuel engine

Effect of fuel composition on properties of particles emitted from a diesel–natural gas dual fuel engine

Performance and Combustion Process of a Dual Fuel Diesel Engine Operating with CNG-Palm Oil Biodiesel

Experimental Studies of Low-Load Limit in a Stoichiometric Micro-Pilot Diesel Natural Gas Engine

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