Efficient hydrotreated vegetable oil combustion under partially premixed conditions with heavy exhaust gas recirculation

Hunicz, Jacek; Matijošius, Jonas; Rimkus, Alfredas; Kilikevičius, Artūras; Kordos, P.; Mikulski, Maciej

doi:10.1016/j.fuel.2020.117350

Cited by 45 publications

(20 citation statements)

References 46 publications

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“…Thus, combustion takes place at a later phase. Chicken fat injected in the cylinder did not evaporate easily, and the fuel started burning later compared with diesel due to a higher molecular weight and the tension film strength, which was also confirmed by [39,40]. More time was needed for the chicken fat droplets to evaporate and burn.…”

Section: Combustion Indicatorsmentioning

confidence: 69%

Study of Indicators of CI Engine Running on Conventional Diesel and Chicken Fat Mixtures Changing EGR

et al. 2021

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This article presents a change in the indicators of a compression ignition (CI) engine by replacing conventional diesel fuel (D100) with pure chicken fat (F100) and mixtures of these fuels. Mixtures of diesel and fat with volume ratios of 70/30, 50/50 and 30/70 were used. Research of the fuel properties was conducted. In order to reduce the fuel viscosity, blends of fat and diesel were heated. The experimental research was conducted at different engine loads with exhaust gas recirculation (EGR) both off and on. The conducted analysis of the combustion process revealed a significant change in the rate of heat release (ROHR) when replacing diesel with chicken fat. Chicken fat was found to increase the CO2 and CO emissions, leaving hydrocarbon (HC) emissions nearly unchanged. Having replaced the D100 with diesel and chicken fat mixtures or F100, a significant reduction in smoke and nitrogen oxide (NOx) emissions was observed when EGR was off. When EGR was on, the smoke level increased, but the blends with chicken fat reduced it significantly, and the increased fat content in the fuel mixture reduced the NOx emissions. The engine’s brake specific fuel consumption (BSFC) increased while the brake thermal efficiency (BTE) decreased, having replaced conventional diesel with chicken fat due to differences in the fuel energy properties and the combustion process.

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Section: Combustion Indicatorsmentioning

confidence: 69%

Study of Indicators of CI Engine Running on Conventional Diesel and Chicken Fat Mixtures Changing EGR

et al. 2021

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“…The following steps form our research agenda in this direction: (1) in the short term, the new sensor model will be used to develop a real-time-capable correction routine and to test it in transient engine operation together with a response delay correction routine; (2) in the long term, the advantage of individual cylinder-based λ control will be demonstrated using the advanced low-temperature combustion platform developed by the authors in [ 29 ].…”

Section: Discussion and Outlookmentioning

confidence: 99%

Excess Air Ratio Management in a Diesel Engine with Exhaust Backpressure Compensation

Kasprzyk

Hunicz

Rybak

et al. 2020

Sensors

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The paper investigates the operation of a wideband universal exhaust gas oxygen (UEGO) sensor in a diesel engine under elevated exhaust backpressure. Although UEGO sensors provide the excess air ratio feedback signal primarily in spark ignition engines, they are also used in diesel engines to facilitate low-emission combustion. The excess air signal is used as an input for the fuel mass observer, as well as to run the engine in the low-emission regime and enable smokeless acceleration. To ensure a short response time and individual cylinder control, the UEGO sensor can be installed upstream of a turbocharger; however, this means that the exhaust gas pressure affects the measured oxygen concentration. Therefore, this study determines the sensor’s sensitivity to the exhaust pressure under typical conditions for lean burn low-emission diesel engines. Identification experiments are carried out on a supercharged single-cylinder diesel engine with an exhaust system mimicking the operation of the turbocharger. The apparent excess air measured with the UEGO sensor is compared to that obtained in a detailed exhaust gas analysis. The comparison of reference and apparent signals shows that the pressure compensation correlations used in gasoline engines do not provide the correct values for diesel engine conditions. Therefore, based on the data analysis, a new empirical formula is proposed, for which the suitability for lean burn diesel engines is verified.

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“…Emissions of CO and unburnt hydrocarbons (UHC) are also lower by the same amount. At the same time NO x emissions are almost unaffected [1,12,22]. Average emission impact of FAME was reported by Demirbas [4]; NO x emissions were increased by 10%, PM and CO emissions were decreased by 45% and UHC emissions were decreased by 65%.…”

Section: Introductionmentioning

confidence: 86%

Comparative study of combustion and emissions of diesel engine fuelled with FAME and HVO

Hunicz¹,

Krzaczek²,

Gęca³

et al. 2021

Combustion Engines

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This study investigates combustion and emission characteristics of a contemporary single-cylinder compression ignition engine fuelled with diesel, fatty acid methyl esters (FAME) and hydrotreated vegetable oil (HVO). These two drop-in fuels have an increasing share in automotive supply chains, yet have substantially different physical and auto-ignition properties. HVO has a lower viscosity and higher cetane number, and FAME has contrary characteristics. These parameters heavily affect mixture formation and the following combustion process, causing that the engine pre-optimized to one fuel option can provide deteriorated performance and excess emissions if another sustainable option is applied. To investigate the scale of this problem, injection pressure sweeps were performed around the stock, low NOX and low PM engine calibration utilizing split fuel injection. The results showed that FAME and HVO prefer lower injection pressures than diesel fuel, with the benefits of simultaneous reduction of all emission indicators compared to DF. Additionally, reduction of injection pressure from 80 MPa to 60 MPa for biodiesels at low engine load resulted in improved brake thermal efficiency by 1 percentage point, due to reduced parasitic losses in the common rail system.

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Efficient hydrotreated vegetable oil combustion under partially premixed conditions with heavy exhaust gas recirculation

Cited by 45 publications

References 46 publications

Study of Indicators of CI Engine Running on Conventional Diesel and Chicken Fat Mixtures Changing EGR

Study of Indicators of CI Engine Running on Conventional Diesel and Chicken Fat Mixtures Changing EGR

Excess Air Ratio Management in a Diesel Engine with Exhaust Backpressure Compensation

Comparative study of combustion and emissions of diesel engine fuelled with FAME and HVO

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