Effect of compression ratio on performance, combustion and emission characteristics of a dual fuel diesel engine run on raw biogas

Bora, Bhaskor Jyoti; Saha, Ujjwal K.; Chatterjee, Soumya; Veer, Vijay

doi:10.1016/j.enconman.2014.07.080

Cited by 242 publications

(72 citation statements)

References 21 publications

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“…Bora et al [31] and Yoon and Lee [50] reported a reduction in brake thermal efficiency and an increase in BSFC (Brake Specific Fuel Consumption) in dual fuel mode compared to diesel operation. This was attributed to early occurrence of peak pressure, low combustion temperature, and flame speed as well as higher pumping work due to the presence of CO2.…”

Section: Performance Indicesmentioning

confidence: 99%

“…However, for pure methane combustion, it is seen that the ID is nearly independent of the quantity of pilot fuel injected [65]. Bora et al [31] observed that the quantity of pilot fuel supplied can be reduced by using high compression ratios because of the shorter ignition delay of biogas at elevated temperatures. They used compression ratios in the range of [16][17][18].…”

Section: Combustion Indicesmentioning

confidence: 99%

“…Dual fuel and diesel modes showed almost equal fuel conversion efficiencies at full load operation whereas efficiency of the dual fuel mode was lower at part loads. Bora et al [31] suggested increasing the compression ratio as a means to partially negate the reduction in brake thermal efficiency of the dual fuel mode. Simulated biogas is used by various researchers in dual fuel mode [56,[74][75][76].…”

Section: Performance Indicesmentioning

confidence: 99%

“…CO and HC emissions can be brought down by increasing the compression ratio by virtue of the higher temperatures. However, this causes a notable increase in CO2 and NOx emissions [31]. The extent of variation of these parameters can be controlled by adjusting the pilot diesel injection quantity [64,65].…”

Section: Emission Indicesmentioning

confidence: 99%

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A review on the purification and use of biogas in compression ignition engines

Feroskhan¹,

Ismail²

2017

Int. J. Automot. Mech. Eng.

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Biogas is commonly produced during the decay of organic matter. It is a mixture of methane and some non-combustible gases such as CO2 and H2S. Its viability as a renewable alternative fuel for internal combustion engines can be enhanced by methane enrichment, i.e. removal of the non-combustible constituents. One of the common techniques for using biogas in a compression ignition (CI) engine is to mix it with air in the intake manifold, induct, and compress this mixture and ignite it by injecting a small quantity of diesel or bio-diesel, which is termed as the pilot fuel. This is known as the dual fuel mode. The pilot fuel is injected close to the end of the compression stroke as in a conventional CI engine and the injected fuel quantity depends on the operating condition. An alternative approach is the Homogeneous Charged Compression Ignition (HCCI) mode. Here, a homogeneous mixture of biogas and air is inducted and compressed by the piston until it auto-ignites. While this concept combines the benefits of spark ignition (SI) and CI engines, the onset of combustion cannot be controlled directly. A detailed review of recent research pertaining to biogas purification techniques and operation of CI engines with biogas in dual fuel and HCCI modes is presented in this paper. The effects of various operating parameters on engine performance and emissions, and comparison with conventional diesel fuelled CI engines are discussed. Biogas improves combustion efficiency, NOx, and smoke emissions. However, it reduces brake thermal efficiency, volumetric efficiency, and increases HC and CO emissions. Biogas fuelling of CI engines is recommended for achieving high diesel substitution, especially under high torque operation.

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Section: Performance Indicesmentioning

confidence: 99%

Section: Combustion Indicesmentioning

confidence: 99%

Section: Performance Indicesmentioning

confidence: 99%

Section: Emission Indicesmentioning

confidence: 99%

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A review on the purification and use of biogas in compression ignition engines

Feroskhan¹,

Ismail²

2017

Int. J. Automot. Mech. Eng.

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“…Emissions of nitrogen oxides, carbon monoxide, and unburnt methane decreased when the biogas was enriched with 50 % methane. More research is done which was focused on different biogas composition effects on engine application [17], [18], [19], [20], [21].…”

Section: Introductionmentioning

confidence: 99%

Composition and Stoichiometry Effects of Biogas as Fuel in Spark Ignition Engine

Mokrane¹,

Energy²,

Adouane³

et al. 2018

INT. J. AUTOMOT. MECH. ENG.

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The most important advantage of biogas is that one can retrofit easily the conventional combustion engines to be used for the new fuel but remain the problem of pollutant emission. In this paper, the effect of the biogas composition on the emissions of CO and NOx in an SI engine is investigated numerically. Three compositions were studied (CH4:40 %, CO2:60 %), (CH4:50 %, CO2:50 %), (CH4:60 %, CO2:40 %), at equivalence ratio (ϕ) from lean to rich. The non-adiabatic partially premixed combustion model with probability density function (PDF) method and Zimont model of the turbulent flame speed are used. It was found that increasing CO2 in the biogas lowers NOx emissions significantly, whereas, CO was found to be very low, and appears only at high CH4 concentration. A biogas with (CH4:60 %, CO2:40 %), burning at about (ϕ = 0.9), i.e. slightly lean mixture, and advanced spark timing (between 10 to 20°.) seems to be a very a realistic combination in terms of biogas composition, stoichiometry and spark timing. It is recommended that, to accomplish some upgrading, in case of biogases with low CH4 percentage, to get it up to 60 %.

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