Combustion Characteristics According to the Chemical Composition of Land Fill Gas

2021 ◽  
Vol 412 ◽  
pp. 131-140
Author(s):  
Munseok Choe ◽  
Yeongcheol Jeon ◽  
Dooseuk Choi
Keyword(s):  
Chemical Composition ◽  
Flame Propagation ◽  
Methane Combustion ◽  
Fuel Composition ◽  
Propagation Process ◽  
High Co2 ◽  
Combustion Pressure ◽  
Constant Volume Combustion Chamber ◽  
Ignition Device ◽  
Over Time

This study was conducted using the existing ignition device to verify the effectiveness of LFG, a renewable energy source. The experimental method used a constant volume combustion chamber to check the flame propagation process and combustion pressure. The experiment was carried out by changing the fuel composition ratio of LFG in the range of LFG70 to LFG40. From the result, it was found that the methane combustion occurred smoothly in LFG70 during the flame propagation process, and that combustion progressed gradually over time. In the LFG60 and LFG50 regions, which are fuels with a high CO2 ratio, it was confirmed that the combustion slowed down and the brightness of the light decreased at the same time. In LFG40 with 40% of CH4, a misfire phenomenon in which combustion does not occur was discovered. For combustion pressure, the CH4 chemical composition of the LFG was lowered, which led to the combustion delay and the reduction of combustion pressure

Study on Flame Propagation Characteristics According to New Ignition- Source in a Constant Volume Combustion Chamber

2019 ◽  
Vol 391 ◽  
pp. 142-151 ◽  
Author(s):  
Mun Seok Choe ◽  
Kwon Se Kim ◽  
Doo Seuk Choi
Keyword(s):  
Combustion Chamber ◽  
Flame Propagation ◽  
Constant Volume ◽  
Ignition Source ◽  
Propagation Characteristics ◽  
Combustion Pressure ◽  
Fuel Ratio ◽  
Constant Volume Combustion ◽  
Constant Volume Combustion Chamber ◽  
Conventional Type

This study has the purpose to consider a new ignition source in order to increase the inflammable limit of a gasoline engine at its lean region. To analyze flame propagation characteristics, a CVCC (constant volume combustion chamber) was produced, and three types of devices – conventional type, arc type, and jet type – were manufactured to conduct combustion testing. Experimental variables were the air/fuel ratio from 1.0 to 1.8 and charging pressure from 2 bar to 4 bar. The result of flame propagation analysis showed that the spread for jet type was faster than that of conventional type by 10 ms, and that of arc type by 5 ms. Result of combustion pressure experiment showed that, at air/fuel ratio of 1.0, arc type showed the highest value, with 22 bar, while jet type showed 19.4 bar and convention type was 17 bar. At maximum inflammable limit experiment, combustion was possible at jet type and arc type in an area above an air/fuel ratio of 1.8, but the conventional type showed miss fire, where combustion did not occur in the area above 1.6. The Study on new ignition source concluded that the jet type shows superior results in terms of combustion speed while the arc type is excellent in terms of combustion pressure.

scholarly journals Influence of Fuel Chemical Properties on Soot Emissions From Gas Turbine Combustors

1989 ◽  
Author(s):  
J. S. Chin ◽  
A. H. Lefebvre
Keyword(s):  
Chemical Composition ◽  
Gas Turbine ◽  
Hydrogen Content ◽  
Continuous Flow ◽  
Empirical Relationship ◽  
Chemical Properties ◽  
Smoke Point ◽  
Fuel Composition ◽  
Wide Range ◽  
Soot Emissions

The influence of fuel composition on soot emissions from continuous flow combustors is examined. A study of the combustion characteristics of a wide range of present and potential aviation fuels suggests that smoke point provides a better indication of sooting tendency than does hydrogen content. It is concluded from this study that the best empirical relationship between fuel chemical composition and soot emissions is one which combines two fuel composition parameters — smoke point and naphthalene content — into a single parameter which is shown to correlate successfully soot emissions data acquired from several different fuels burning in a variety of gas turbine and model combustors.

A Comparative Study of Methane Combustion Characteristics with Different Additions in an Optical SI Engine

2021 ◽  
Author(s):  
Lin Chen ◽  
Xiao Zhang ◽  
Ren Zhang ◽  
Wanhui Zhao
Keyword(s):  
Natural Gas ◽  
Flame Propagation ◽  
Power Output ◽  
High Speed ◽  
Propagation Speed ◽  
Pressure Oscillation ◽  
Methane Combustion ◽  
Natural Gas Engines ◽  
Auto Ignition ◽  
Flame Propagation Speed

Abstract Natural gas is a promising fuel for IC engines with minimal modification, whereas its low power output and slow flame propagation speed remain a challenge for automobile manufacturers. To find a method of improving the natural gas engines, methane combustion with different additions was comparatively studied. High-speed direct photography and simultaneous pressure were performed to capture detailed combustion evolutions. First, the results of pure methane combustion confirm its good anti-knock property, and no pressure oscillation occurs even there is an end-gas auto-ignition, indicating that high compression ratio and high boosting are effective ways to improve the performance of natural gas engines. Second, adding heavy hydrocarbons can greatly improve engines' power output, but engine knock should be considered if low anti-knock fuel was used. Third, as a carbon-free and gaseous fuel, hydrogen addition can not only increase methane flame propagation speed but reduce cyclic variations. However, a proper fraction is needed under different load conditions. Last, oxygen-enriched combustion is an effective way to promote methane combustion. The heat release becomes faster and more concentrated, specifically, the flame propagation speed can be increased by more than 2 times under 27% oxygen concentration condition. The current study shall give insights into improving natural gas engines' performance.

scholarly journals Review on the Relationship Between Liquid Aerospace Fuel Composition and Their Physicochemical Properties

2020 ◽  
Author(s):  
Xiaoyu Wang ◽  
Tinghao Jia ◽  
Lun Pan ◽  
Qing Liu ◽  
Yunming Fang ◽  
...  
Keyword(s):  
Chemical Composition ◽  
Physicochemical Properties ◽  
High Performance ◽  
Freezing Point ◽  
Operating Conditions ◽  
Hydrocarbon Fuels ◽  
Least Square ◽  
Fuel Properties ◽  
Molar Ratio ◽  
Fuel Composition

AbstractThe development of advanced air transportation has raised new demands for high-performance liquid hydrocarbon fuels. However, the measurement of fuel properties is time-consuming, cost-intensive, and limited to the operating conditions. The physicochemical properties of aerospace fuels are directly influenced by chemical composition. Thus, a thorough investigation should be conducted on the inherent relationship between fuel properties and composition for the design and synthesis of high-grade fuels and the prediction of fuel properties in the future. This work summarized the effects of fuel composition and hydrocarbon molecular structure on the fuel physicochemical properties, including density, net heat of combustion (NHOC), low-temperature fluidity (viscosity and freezing point), flash point, and thermal-oxidative stability. Several correlations and predictions of fuel properties from chemical composition were reviewed. Additionally, we correlated the fuel properties with hydrogen/carbon molar ratios (nH/C) and molecular weight (M). The results from the least-square method implicate that the coupling of H/C molar ratio and M is suitable for the estimation of density, NHOC, viscosity and effectiveness for the design, manufacture, and evaluation of aviation hydrocarbon fuels.

The scent of urine spots of male mice,Mus musculus: changes in chemical composition over time

2006 ◽  
Vol 20 (24) ◽  
pp. 3741-3746 ◽  
Author(s):  
Andrea Cavaggioni ◽  
Carla Mucignat-Caretta ◽  
Marco Redaelli ◽  
Giuseppe Zagotto
Keyword(s):  
Chemical Composition ◽  
Mus Musculus ◽  
Male Mice ◽  
Over Time

327 Development of Non-eccentric Rotor IC Engine : Optical Observations of Ignition and Flame Propagation Process

2014 ◽  
Vol 2014.63 (0) ◽  
pp. _327-1_-_327-2_
Author(s):  
Yu SAKAI ◽  
Keisuke TESHIMA ◽  
Hiroyuki FUJII ◽  
Yusaku YAMAMOTO ◽  
Yu SAIKI ◽  
...  
Keyword(s):  
Flame Propagation ◽  
Optical Observations ◽  
Propagation Process ◽  
Ic Engine ◽  
Eccentric Rotor

scholarly journals The technologies of improving the process of air-fuel mixture combustion in spark ignition engines

2020 ◽  
pp. 51-57
Author(s):  
A. P. Shaikin ◽  
◽  
I. R. Galiev ◽  
D. A. Pavlov ◽  
M. V. Sazonov ◽  
...  
Keyword(s):  
Chemical Composition ◽  
Internal Combustion Engine ◽  
Flame Propagation ◽  
Turbulence Intensity ◽  
Propagation Velocity ◽  
Combustion Engine ◽  
Combustion Process ◽  
Fuel Mixture ◽  
Flame Propagation Velocity ◽  
Combustion Phase

The paper considers the turbulence intensity and the fuel chemical composition impact on the flame propagation velocity at the initial and main combustion phases when changing the air-fuel mixture composition. The relevance of the study is caused by the fact that currently, the improvement of conventional engine operation characteristics is mainly achieved through the improvement of the fuel mixture combustion process. However, there are no data on the influence of chemical and gas-dynamic factors on the peculiarities of flame propagation at the initial and main combustion phases. The gas reciprocating internal combustion engine was the object of the research, and the subject of the study was the fuel combustion process. Fuel chemical composition changed due to the promoting addition of hydrogen to the natural gas and variations of the excess-air coefficient. The experiments carried out on the UIT-85 power plant (i.e. under the simulated internal combustion engine conditions) show that the promoting addition of hydrogen stronger influences the flame velocity in the initial combustion phase compared to the second combustion phase, as a combustion source in the first phase is a laminar flame bent front and depends only on chemical and thermo-physical properties of the fuel-air mixture. The analysis of experimental data showed the dual impact of turbulence intensity on the flame propagation velocity. In particular, at the beginning of the combustion process, the fluctuating velocity scarcely influences the flame propagation velocity, as opposed to the main combustion phase, where the flame propagation velocity increases at the increase of turbulence intensity.

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