Research progress in the development of natural gas as fuel for road vehicles: A bibliographic review (1991–2016)

Khan, Muhammad Imran; Yasmeen, Tabassam; Khan, Muhammad Ijaz; Farooq, Muhammad; Wakeel, Muhammad

doi:10.1016/j.rser.2016.08.041

Cited by 128 publications

(53 citation statements)

References 23 publications

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“…The CoV and R 2 obtained from the results of practical and numerical comparison for new mixer (i.e., 0.001494 and 0.96, respectively) indicate good accuracy and consistency for the AFR values. Figure 22 shows the relationship between the engine speed and valve displacement under different air-CNG ratios and constant pressure in the CNG inlet at the new mixer (25,395.63 Pa). The amount of air increases with increasing engine speed, and the valve displacement (forward) is increased to allow more fuel flow into the mixer.…”

Section: Verification Of the Cfd Resultsmentioning

confidence: 99%

New Design of a CNG-H2-AIR Mixer for Internal Combustion Engines: An Experimental and Numerical Study

et al. 2017

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Several studies have aimed to convert diesel engines to dual-or tri-fuel engines to improve their fuel economy and reduce the emissions from diesel engine, however, most of these studies do not consider enhancing the homogeneity of fuel mixtures inside the engine and accurately controlling the air fuel ratio. In this study, a new air-fuel mixer was designed, manufactured and tested. The proposed air-gaseous fuel mixer design was conceived to be suitable for mixing air with compressed natural gas (CNG) and a blend of hydrogen and compressed natural gas (HCNG) that gives homogenous mixtures with high uniformity index and also to be easily connected with an Electronic Control Unit (ECU) for controlling accurately the air-gaseous fuel ratio for different engine speeds. For optimizing the homogeneity inside the new mixer, fourteen different mixer models were created to investigate the effects of diameter, location, and the number of holes inside the mixer on the homogeneity and distribution of the mixtures. Computational fluid dynamics analysis software was used to check the flow behavior, distribution and homogeneity of mixtures inside the new mixer models. The simulation results revealed that the best uniformity index (UI) values are obtained in model 7 where the UI values are 0.939 and 0.937, respectively, for an air fuel ratio for a blend of hydrogen and compressed natural gas (AFRHCNG) = 51.31 and the air fuel ratio for compressed natural gas (AFRCNG) = 34.15. According to the numerical and experimental results for the new mixer (model 7) under different engine speeds (1000-4000) and air-CNG ratio of 34.15, a meaningful agreement is reached between the experimental and numerical values for AFRCNG (coefficient of determination (R 2 ) = 0.96 and coefficient of variation (CoV) = 0.001494).

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Section: Verification Of the Cfd Resultsmentioning

confidence: 99%

New Design of a CNG-H2-AIR Mixer for Internal Combustion Engines: An Experimental and Numerical Study

et al. 2017

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“…A importância do uso do gás natural na matriz energética mundial se destaca por suas vantagens em relação a outras fontes de energia como, por exemplo, a sua forma de combustão mais limpa e completa quando comparada a dos combustíveis líquidos derivados do petróleo (KHAN et al, 2016).…”

Section: Introductionunclassified

Avaliação De Métodos De Cálculo Para O Calor Isostérico De Adsorção De Co2 E Ch4 Em Carvão Ativado

Gaschi¹,

Meneguin²,

Silva³

et al. 2018

Blucher Chemical Engineering Proceedings

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RESUMO -A remoção de contaminantes do gás natural bruto, utilizando o processo de adsorção, é baseada no conhecimento de isotermas de adsorção e da energia de interação presente nos sistemas adsorvato/adsorvente. Desta forma, neste trabalho foi determinado o calor isostérico de adsorção para CO2 e CH4 em carvão ativado. Isotermas de adsorção experimentais foram obtidas pelo método volumétrico, a baixas pressões, e o cálculo do calor foi realizado utilizando-se dois métodos distintos: a) pela equação de Clausius-Clapeyron aplicada diretamente aos dados de adsorção; b) considerando que o volume da fase adsorvida pode ser descrito por diferentes modelos aplicados na equação de Dubinin-Astakhov acoplada com a equação de Clausius-Clapeyron. Os valores obtidos para o calor isostérico estão de acordo com dados presentes an literatura e sugerem que utilizar uma equação para o volume da fase adsorvida juntamente com o modelo de Clausius-clapeyron apresenta melhores resultados. INTRODUÇÃOA importância do uso do gás natural na matriz energética mundial se destaca por suas vantagens em relação a outras fontes de energia como, por exemplo, a sua forma de combustão mais limpa e completa quando comparada a dos combustíveis líquidos derivados do petróleo (KHAN et al., 2016).Para comercialização e a fim de se evitar danos nos equipamentos utilziados para seu processamento, o gás natural necessita ser purificado, removendo-se gases ácidos contaminantes como, por exemplo, CO2 e H2S, sendo a adsorção gasosa um método promissor neste sentido (SONG et al., 2014). O estudo da remoção de gases ácidos de metano, principal componente do gás natural, por meio de adsorção, requer compreensão sobre a adsorção em equilíbrio, estudada por meio de isotermas de adsorção, em que o comportamento na região de Henry e medidas de calor isostérico são realizadas a fim de se conhecer um provável

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“…Natural gas has a higher ignition delay compared to liquid fuels, due to its lower flame propagation speed. As a result, the power of the gas powered engine may be about 5-10% less than that of a liquid powered engine [7,8]. The comparison of the parameters of main fuels used in combustion engines is presented in Table 1.…”

Section: Introductionmentioning

confidence: 99%

“…Table 1. Comparison of main parameters of engine fuels [7]. The use of CNG PFI engine allows for about 30% decreased torque at low engine speeds relative to the SI DI engine [10].…”

Section: Introductionmentioning

confidence: 99%

Turbulent spark-jet ignition in SI gas fuelled engine

et al. 2017

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Abstract. The article contains a thermodynamic analysis of a new combustion system that allows the combustion of stratified gas mixtures with mean air excess coefficient in the range 1.4-1.8. Spark ignition was used in the pre-chamber that has been mounted in the engine cylinder head and contained a rich mixture out of which a turbulent flow of ignited mixture is ejected. It allows spark-jet ignition and the turbulent combustion of the lean mixture in the main combustion chamber. This resulted in a two-stage combustion system for lean mixtures. The experimental study has been conducted using a single-cylinder test engine with a geometric compression ratio  = 15.5 adapted for natural gas supply. The tests were performed at engine speed n = 2000 rpm under stationary engine load when the engine operating parameters and toxic compounds emissions have been recorded. Analysis of the results allowed to conclude that the evaluated combustion system offers large flexibility in the initiation of charge ignition through an appropriate control of the fuel quantities supplied into the pre-chamber and into the main combustion chamber. The research concluded with determining the charge ignition criterion for a suitably divided total fuel dose fed to the cylinder.

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Research progress in the development of natural gas as fuel for road vehicles: A bibliographic review (1991–2016)

Cited by 128 publications

References 23 publications

New Design of a CNG-H2-AIR Mixer for Internal Combustion Engines: An Experimental and Numerical Study

New Design of a CNG-H2-AIR Mixer for Internal Combustion Engines: An Experimental and Numerical Study

Avaliação De Métodos De Cálculo Para O Calor Isostérico De Adsorção De Co2 E Ch4 Em Carvão Ativado

Turbulent spark-jet ignition in SI gas fuelled engine

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