Influence of fuel hydrogen fraction on syngas fueled SI engine: Fuel thermo-physical property analysis and in-cylinder experimental investigations

Shivapuji, Anand M.; Dasappa, S.

doi:10.1016/j.ijhydene.2015.06.062

Cited by 40 publications

(19 citation statements)

References 72 publications

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“…Several authors [7,8,[13][14][15][16][17] have studied syngas mixtures and compared them with conventional fuels (gasoline, natural gas, and hydrogen) in terms of engine performance, durability, combustion stability, and exhaust emissions. A reduction in efficiency and power was observed due to low energy density.…”

Section: Introductionmentioning

confidence: 99%

Effect of Fuel and Air Dilution on Syngas Combustion in an Optical SI Engine

et al. 2019

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To mitigate the increasing concentration of carbon dioxide in the atmosphere, energy production processes must change from fossil to renewable resources. Bioenergy utilization from agricultural residues can be a step towards achieving this goal. Syngas (fuel obtained from biomass gasification) has been proved to have the potential of replacing fossil fuels in stationary internal combustion engines (ICEs). The processes associated with switching from traditional fuels to alternatives have always led to intense research efforts in order to have a broad understanding of the behavior of the engine in all operating conditions. In particular, attention needs to be focused on fuels containing relatively high concentrations of hydrogen, due to its faster propagation speed with respect to traditional fossil energy sources. Therefore, a combustion study was performed in a research optical SI engine, for a comparison between a well-established fuel such as methane (the main component of natural gas) and syngas. The main goal of this work is to study the effect of inert gases in the fuel mixture and that of air dilution during lean fuelling. Thus, two pure syngas blends (mixtures of CO and H2) and their respective diluted mixtures (CO and H2 with 50vol% of inert gases, CO2 and N2) were tested in several air-fuel ratios (stoichiometric to lean burn conditions). Initially, the combustion process was studied in detail by traditional thermodynamic analysis and then optical diagnostics were applied thanks to the optical access through the piston crown. Specifically, images were taken in the UV-visible spectrum of the entire cycle to follow the propagation of the flame front. The results show that hydrogen promotes flame propagation and reduces its distortion, as well as resulting in flames evolving closer to the spark plug. All syngas blends show a stable combustion process, even in conditions of high air and fuel dilution. In the leanest case, real syngas mixtures present a decrease in terms of performance due to significant reduction in volumetric efficiency. However, this condition strongly decreases pollutant emissions, with nitrogen oxide (NOx) concentrations almost negligible.

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Section: Introductionmentioning

confidence: 99%

Effect of Fuel and Air Dilution on Syngas Combustion in an Optical SI Engine

et al. 2019

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“…The coefficient of variation (COV) of the indicated mean effective pressure (IMEP) is an important indicator of combustion stability, which can be used to identify the ideal operating conditions, serving as a parameter to quantify stable engine operation with minimal fuel consumption . With a lean mixture and an increase in λ , the COV of IMEP also increases .…”

Section: Resultsmentioning

confidence: 99%

“…Spark ignition (SI) engines, operating with biogas or methane‐syngas mixtures produced in the rice industry, can be used to generate clean and renewable energy, reducing dependence on electric energy provided by the grid and mitigating the negative environmental impacts of emissions in the atmosphere. The literature so far has only reported the use of syngas in SI engines, and only one work was found that explored the mixture of biogas and synthesis gas, where horticultural residues were used to produce syngas…”

Section: Introductionmentioning

confidence: 99%

Analytical comparison of emissions before and after using a three‐way catalyzer connected to an SI gas engine operating with methane, natural gas, biogas, and different syngas content

Nadaleti

Przybyła

Lourenço

et al. 2019

Biofuels Bioprod Bioref

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This work compares two studies in which the spark ignition gas engine test was used with typical biogases generated in the rice industry: Bio70 (Study 1), Bio65 (Study 2), Syngas1 and Syngas2 (in both studies). Methane (Study 1) and natural gas (Study 2) were also used. From these studies, three different ignition advance angles were chosen: 20°, 35°, and 55°, to compare and analyze the effects of these fuels and their mixtures inside the engine. The emissions were also evaluated using a three‐way catalytic converter connected to the engine. Study 1 demonstrated lower CO and hydrocarbon (HC) emissions than Study 2 for all conditions and all fuels, whereas NOx emissions varied according to the engine operating conditions (λ and ignition advance angle). Except in the case of the syngases, Study 1 demonstrated higher indicated efficiency, electrical efficiency, and electrical power than Study 2. After the use of the three‐way catalytic converter, HC and CO emissions were strongly reduced for all fuels and in different operational conditions. On the other hand, because the efficiency of the catalytic converter decreases abruptly in mixtures rich in NOx, this pollutant was not removed when λ > 1. The comparison of the two studies and the emissions after the use of a catalytic converter is important as it shows specific ways to improve the use and efficiency of the fuels to encourage the development of renewable energy both in industry and in the transport sector. © 2019 Society of Chemical Industry and John Wiley & Sons, Ltd

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“…Shivapuji and Dasappa [41] X X X X -H 2 in syngas increases the engine thermal efficiency at full load but decreases it at partial load -H 2 also improves the combustion (increases heat generation and flame laminar velocity, decreases combustion duration)…”

Section: % Syngasmentioning

confidence: 99%