Engine characteristics of emissions and performance using mixtures of natural gas and hydrogen

Bysveen, Marie

doi:10.1016/j.energy.2006.07.032

Cited by 118 publications

(29 citation statements)

References 12 publications

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“…The effects of hydrogen addition on the combustion and pollutant characteristics of natural gas spark-ignition engines have been experimentally investigated and the results showed that the concentrations of unbumed hydrocarbons (UHC), carbon monoxide (CO), and carbon dioxide (CO2) could be reduced [19][20][21][22][23][24][25]. However, NOx may increase for natural ga.s-hydrogen combustion due to increased burned gas temperature.…”

Section: Introductionmentioning

confidence: 99%

Lean Partially Premixed Combustion Investigation of Methane Direct-Injection Under Different Characteristic Parameters

Askari

Metghalchi

Hannani

et al. 2014

Journal of Energy Resources Technology

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The effects of hydrogen addition, diluent addition, injection pressure, chamber pressure, chamber temperature and turbulence intensity on methane-air partially premixed turbulent combustion have been studied experimentally using a constant volume combustion chamber (CVCC). The fuel-air mixture was ignited by centrally located electrodes at given spark delay times of 1, 5, 40, 75, and 110ms. Experiments were performed for a wide range of hydrogen volumetric fractions (0% to 40%), simulated diluent volumetric fractions (0% to 25% as a diluent), injection pressures (30-90 bar), chamber pressures (1-3 bar), chamber temperatures (298-432 K) and overall equivalence ratios of 0.6, 0.8, and 1.0. Elame propagation images via the Schlieren/Shadowgraph technique, combustion characteristics via pressure derived parameters and pollutant concentrations were analyzed for each set of conditions. The results showed that peak pressure and maximum rate of pressure rise increased with the increase in chamber pressure and temperature while changing injection pressure had no considerable effect on pressure and maximum rate of pressure rise. The peak pressure and maximum rate of pressure rise increased, while combustion duration decreased with simultaneous increase of hydrogen content. The lean burn limit of methane-air turbulent combustion was improved with hydrogen addition. Addition of diluent increased combustion instability and misfiring while decreasing the emission of nitrogen oxides (NOJ.

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Section: Introductionmentioning

confidence: 99%

Lean Partially Premixed Combustion Investigation of Methane Direct-Injection Under Different Characteristic Parameters

Askari

Metghalchi

Hannani

et al. 2014

Journal of Energy Resources Technology

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“…Several studies were conducted on engine fuelled with natural gas-hydrogen hybrid fuel. The effects of hydrogen addition on combustion and emissions characteristics of the natural gas spark-ignition engine were experimentally investigated [2][3][4][5][6][7][8], and the results showed that the exhaust HC, CO, and CO 2 concentrations could be decreased for an engine operated on the natural gas-hydrogen blends comparing with those of natural gas engine. However, NO x may increase for natural gas-hydrogen combustion at rich mixture condition due to the increase of flame propagation speed and combustion temperature.…”

Section: Introductionmentioning

confidence: 99%

Characteristics of direct injection combustion fuelled by natural gas–hydrogen mixtures using a constant volume vessel

Wang

Huang

Miao

et al. 2008

International Journal of Hydrogen Energy

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“…The DNS presented will supply beneficial references to better understanding of flame-vortex interaction and development of more accurate general model for turbulent premixed combustion. direct numerical simulation, premixed flame, turbulence, geometrical structure Citation: Lv Y, Wang Z H, Pei H, et al Topological analysis of methane lean premixed flame in turbulent jet flow by direct numerical simulation.Gas turbine and engine fuelled by natural gas and air mixture in lean equivalence ratio have been considered to be the most promising way to utilize natural gas efficiently and cleanly [1,2]. However, in industrial and practical operation conditions, this type of premixed combustion is universally companied with strong turbulence flow.…”

mentioning

confidence: 99%

“…Gas turbine and engine fuelled by natural gas and air mixture in lean equivalence ratio have been considered to be the most promising way to utilize natural gas efficiently and cleanly [1,2]. However, in industrial and practical operation conditions, this type of premixed combustion is universally companied with strong turbulence flow.…”

mentioning

confidence: 99%

Topological analysis of methane lean premixed flame in turbulent jet flow by direct numerical simulation

Wang

et al. 2010

Chin. Sci. Bull.

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Direct numerical simulation is employed to investigate the premixed jet flame of methane in lean, combined with a detailed chemical kinetics including 17 species and 58 elemental steps and distinct Lewis numbers. Cold methane-air mixture at 0.55 equivalence ratio is injected into the coflow area with 9500 Reynolds number. The coflow ambient gas is set to be the burnt gas of the methane-air mixture in main jet and temperature is assigned to be the corresponding adiabatic flame temperature 1515 K. The whole simulation process is run based on paralleled calculation method, and chemical sources are acquired by dynamically calling CHEMKIN library function. The flame structure at 6.98 ms is shown to demonstrate the obvious dependence of flame structure and reaction rate on vortices motion. Then by tracing the interaction between different flame elements and vortices, the mechanism behind this dependence is found. The concepts including surface density function, mean curvature and stretch rate are used to describe the geometrical structure of vortex-affected flame. Those are all calculated according to simulation result and statistically associated with heat release rate that indicates reaction intensity. The statistical results show that surface density function and reaction rate own direct positive correlation; largely wrinkled flames with greater curvatures magnitude tend to become thick and weaken surface density function and reaction rate, appearing local extinction phenomena; large tangential stretch rates exerted on flame usually produce a local thinning effect in normal making reaction rate intensified. The DNS presented will supply beneficial references to better understanding of flame-vortex interaction and development of more accurate general model for turbulent premixed combustion. direct numerical simulation, premixed flame, turbulence, geometrical structure Citation: Lv Y, Wang Z H, Pei H, et al. Topological analysis of methane lean premixed flame in turbulent jet flow by direct numerical simulation.Gas turbine and engine fuelled by natural gas and air mixture in lean equivalence ratio have been considered to be the most promising way to utilize natural gas efficiently and cleanly [1,2]. However, in industrial and practical operation conditions, this type of premixed combustion is universally companied with strong turbulence flow. Combustion in turbulent jet flow is more practical, since direct injecting way of inputting reactive mixture has been extensively employed.In the combustion region, the reaction front of the premixed flame is wrinkled, stretched and compressed by vortices motion, forming a very complicated flame topology. Geometrical modeling [3,4] of premixed combustion is an attempt to capture this topology. In this modeling strategy, flame front is described as a geometrical entity transported by vortices motion and interaction. Although it has been widely used in LES (Large Eddy Simulation) [5] of turbulence combustion, the challenge of how to associate local flame structure affected by vorti...

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Engine characteristics of emissions and performance using mixtures of natural gas and hydrogen

Cited by 118 publications

References 12 publications

Lean Partially Premixed Combustion Investigation of Methane Direct-Injection Under Different Characteristic Parameters

Lean Partially Premixed Combustion Investigation of Methane Direct-Injection Under Different Characteristic Parameters

Characteristics of direct injection combustion fuelled by natural gas–hydrogen mixtures using a constant volume vessel

Topological analysis of methane lean premixed flame in turbulent jet flow by direct numerical simulation

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