Combustion process and emissions of a heavy-duty engine fueled with directly injected natural gas and pilot diesel

Qiang, Zhimin; Li, Menghan; Shao, Shanshan

doi:10.1016/j.apenergy.2015.08.021

Cited by 73 publications

(23 citation statements)

References 29 publications

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“…Similar CO emissions trends were also reported by other researchers [15,19,20]. Numerous experimental studies reported the effect of diesel fuel quantity and injection timing on CO emissions from NG-diesel dual fuel engines [26,[34][35][36]. For example, Liu et al [26] experimentally studied the effect of pilot fuel quantity on the emission characteristics of a NG-diesel dual fuel engine.…”

Section: Co Emission From Ng-diesel Dual Fuel Enginesupporting

confidence: 75%

“…For example, Liu et al [26] experimentally studied the effect of pilot fuel quantity on the emission characteristics of a NG-diesel dual fuel engine. Zhang et al [36] experimentally investigated the variation of CO emissions with changes in numerous operating parameters including engine speed, diesel fuel rail pressure, and diesel injection timing. As expected, the CO emissions from dual fuel engines were higher than that from traditional diesel engines.…”

Section: Co Emission From Ng-diesel Dual Fuel Enginementioning

confidence: 99%

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A Numerical Investigation of Natural Gas-Diesel Dual Fuel Engine Combustion and Emissions Using CFD Model

Yu¹

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Natural gas (NG)-diesel dual fuel engines have been highlighted for their fuel flexibility and high thermal efficiency comparable to diesel engines. However, the addition of NG to compression ignition diesel engines was reported to elongate ignition delay and to increase the emissions of carbon monoxide (CO), unburned methane (CH4), and nitrogen dioxide (NO2). Past research on dual fuel engines has focused on the experimental research on the engine performance, combustion process, and exhaust emissions. The research on detailed mechanism dominating the impact of CH4 on formation of CO and NO2 in cylinder, and the mechanism for CH4 to survive the combustion process and slip through the cylinder is limited. The examinations of these mechanisms require the simulation of dual fuel engine combustion using a CFD model coupled with chemical kinetic mechanism. This research numerically investigates the combustion process and exhaust emissions from two NG-diesel dual fuel engines using a CFD model coupled with a reduced primary reference fuel (PRF) chemistry. The CFD model used is Converge-SAGE model with a maximum of 300000 grid points. The fuel chemistry used is a reduced PRF mechanism with 45 species and 142 reactions including a reduced NOx mechanism with 4 species and 12 reactions. The CFD model with reduced PRF chemistry has been validated against experimental data measured in a single-cylinder compression-ignition engine over a wide range of CH4 substitution ratio. A post-processing tool has been developed to calculate, analyze, and visualize the instantaneous rate of production (ROP) of key species in each cell with the known temperature, pressure, and species concentration exported by CFD code. The simulation results are further post-processed to numerically investigate the combustion process and the formation mechanism of CO, and NO2 in a dual fuel engine. The mechanism for CH4 to survive the main combustion process and post-combustion oxidation process is numerically examined. The research on NO2 formation identified NO+HO2→NO2+OH as the key reaction dominating the increased formation of NO2 in dual fuel engines. The HO2 necessary for the formation of NO2 emitted by the engine is produced through the post-oxidation of CH4 that survived the main combustion process. The CO emitted from the NG-diesel dual fuel engine is formed through the oxidation of CH4 during the late

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Section: Co Emission From Ng-diesel Dual Fuel Enginesupporting

confidence: 75%

Section: Co Emission From Ng-diesel Dual Fuel Enginementioning

confidence: 99%

A Numerical Investigation of Natural Gas-Diesel Dual Fuel Engine Combustion and Emissions Using CFD Model

Yu¹

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“…The engine performance is increased at low FIPs accompanied with a lower mass emission of CO 2 , CO, HC and NO x . Zhang et al (2015), Imtenan et al (2015) and Wamankar & Murugan (2015) support the same concept of injection timing and pressure on the engine performance that when the combustion process takes place earlier, leads to a reduction in SFC and exhaust gas temperature.…”

Section: Introductionmentioning

confidence: 85%

Assessment of the performance and the exhaust emissions of a marine diesel engine for different start angles of combustion

Tadros¹,

Ventura²,

Soares³

2016

Maritime Technology and Engineering III

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The start angle of combustion plays an important role in determining the performance and the exhaust emissions of a diesel engine. In this paper, the assessment of the behavior of a marine diesel engine is presented for twelve start angles of combustion. The simulation is done using a 1D engine simulation code developed and implemented in Matlab, which was validated with a commercial software tool. Three engine speeds are considered during the simulation. The optimum range of crank angles to start the combustion is determined for engine optimization. The heat release rate and the Wiebe function are used to determine the behavior of the combustion process. The amount of carbon dioxide (CO 2 ) and nitrogen oxide (NO x ) emissions are calculated for the different cases assumed. The simulation results are compared with data taken from a real engine.

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“…216-224 (pISSN:2541-5972, eISSN: 2548-1479 220 In general, the rotational flow is formed due to an angular tendency between the axis of the rotational base on the inside of the cylinder with the cylinder axis. The magnitude of this angle depends on the intake runner or machine port inlet, the ratio of bore and stroke, the shape of the combustion chamber and the geometry of the suction valve [27]. Valves are engine components associated with airflow.…”

Section: Figure3 Turbulent Flow Illustrationmentioning

confidence: 99%

Technical Review of Fin Addition Analysis of Air Intake Valve on Gas-Oil Fuel Engine

Semin

Rfc²,

Cahyono

et al. 2018

IJMEIR

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Abstractmodification of single-fuel diesel engine into dual-fuel diesel engine has been done by researchers to solve the problem of depletion petroleum reserves. Even the problem petroleum reserves are projected to be exhausted in the next 50 years. Gas-Oil fuel engine focus on solar-CNG as a fuel. Explanation of the difference in the fuel ratio of diesel engines with Gas-Oil fuel diesel engines has considerable differences. The factors that are discussed here are the factors of mixing air and fuel. The amount of fuel in the Gas-Oil fuel diesel engine causes an increase in the gas fuel mass flow rate (CNG), although with the addition of fuel gas, the mass flow rate of diesel oil is reduced. In this paper, the Gas-Oil fuel engines research and development fueled using solar-CNG are highlighted to keep the performance of the engine. Modification focused on air intake valve to give maximum turbulent flow ratio and effect on increasing Gas-Oil fuel engine performance. The high activities for future Gas-Oil fuel engines research and development to meet future Gas-Oil fuel engine solar-CNG is recorded in the paper.

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Combustion process and emissions of a heavy-duty engine fueled with directly injected natural gas and pilot diesel

Cited by 73 publications

References 29 publications

A Numerical Investigation of Natural Gas-Diesel Dual Fuel Engine Combustion and Emissions Using CFD Model

A Numerical Investigation of Natural Gas-Diesel Dual Fuel Engine Combustion and Emissions Using CFD Model

Assessment of the performance and the exhaust emissions of a marine diesel engine for different start angles of combustion

Technical Review of Fin Addition Analysis of Air Intake Valve on Gas-Oil Fuel Engine

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