Comparative study of exhaust gas recirculation (EGR) and hydrogen-enriched EGR employed in a SI engine fueled by biobutanol-gasoline

Zhao, Lifeng; Su, Xiangyang; Wang, Xueyuan

doi:10.1016/j.fuel.2020.117194

Cited by 23 publications

(9 citation statements)

References 51 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Nowadays, with the rapid developments of the economy and industrial automation, the shortage of resources (such as non-renewable energy, oil [53], and coal [54]) and environmental pollution (air pollution [55] and human health [56]) are becoming more and more serious [57]. How to effectively control energy shortage [58][59][60][61][62][63] and engine emission reduction [64][65][66][67][68][69][70][71][72][73][74] are the main areas of interest for researchers today.…”

Section: Discussionmentioning

confidence: 99%

Effects of Different Mixture Ratios of Methanol-Diesel on the Performance Enhancement and Emission Reduction for a Diesel Engine

Zhang

Tian

et al. 2021

Processes

View full text Add to dashboard Cite

To improve the combustion and emission characteristics of diesel engines, methanol-diesel fuels with different mixing ratios (DM0, DM10, DM20, DM30, and DM40) were used to investigate the effects of methanol addition on the combustion and emission of a four-stroke diesel engine in terms of cylinder pressure, brake power, brake-specific fuel consumption, and nitrogen oxides, soot, and carbon monoxide emissions. Firstly, an improved entire diesel engine model was developed using AVL-BOOST software and validated by the experimental results. The results showed that the increase of methanol content in the fuel mixture had a negative impact on the performance characteristic of the diesel engine, but significantly improved the emission characteristic of the diesel engine. With the methanol ratio in the mixed fuel increased to 10%, 20%, 30%, and 40%, the cylinder pressure of the engine increased by 0.89%, 1.48%, 2.29%, and 3.17%, respectively. However, the power decreased by 3.76%, 6.74%, 11.35%, and 15.45%, the torque decreased by 3.76%, 6.74%, 11.35%, and 15.45%, respectively, and the brake specific fuel consumption increased by 3.77%, 6.92%, 12.33%, and 17.61%, respectively. In addition, with the methanol ratio in the mixed fuel increased to 10%, 20%, 30%, and 40%, the carbon monoxide emission decreased by 21.32%, 39.04%, 49.81%, and 56.59% and the soot emission decreased by 0.25%, 8.69%, 16.81%, and 25.28%, respectively. Therefore, the addition of methanol to the fuel can improve the combustion and emission characteristics of the engine.

show abstract

Section: Discussionmentioning

confidence: 99%

Effects of Different Mixture Ratios of Methanol-Diesel on the Performance Enhancement and Emission Reduction for a Diesel Engine

Zhang

Tian

et al. 2021

Processes

View full text Add to dashboard Cite

show abstract

“…Therefore, the urgency to save energy and reduce emissions is still the main concern for the use of turbocharged engines. As is well known, VVA and EGR have been proved to be effective techniques for improving the efficiency and reducing the probability of knocking in turbocharged engines. − …”

Section: Introductionmentioning

confidence: 99%

“…With EGR, the experimental study showed that the combustion characteristics were affected by natural gas–hydrogen blends. The combustion duration and flame development duration increase with increased EGR rate; however, these decreased with the increased H 2 in the blends. , Zhao et al added hydrogen to an isobutanol–gasoline during the EGR and investigated the effects of hydrogen combined with EGR on the engine thermal efficiency and emission. The results showed that the combustion progress of the butanol–gasoline mixture slowed down with EGR, and that combining hydrogen with EGR can effectively improve the combustion stability because of reducing the burn-period extension.…”

Section: Introductionmentioning

confidence: 99%

Quantitative Analysis of the Influence Saliency of VVA and EGR on the Fuel Economy and Mixture Combustion Characteristics of a Turbocharged Spark Ignition Engine

Wang

Liu

et al. 2021

ACS Omega

View full text Add to dashboard Cite

To meet the stringent emission regulations and fuel economy demands of the spark ignition (SI) engine, more and more new technologies such as turbocharging, variable valve actuation (VVA), and exhaust gas recirculation (EGR) are being developed. For the turbocharged SI engine, the high boost pressure can lead to higher laminar combustion velocity with higher maximum burned gas temperature, which induces more emissions; it also carries a risk of serious knocking, which can not only deteriorate the brake-specific fuel consumption (BSFC) but also destroy the engine. As is well known, the dilution mixture gas methods, which include VVA and EGR, are effective techniques to advance the combustion phase and suppress knocking in the SI turbocharged engines. The effects of VVA and EGR rates on the BSFC and combustion characteristics of an SI engine were analyzed through 100 groups of engine experiments, and the quantitative analysis of the influence saliency of VVA and EGR rates has been introduced. Then, the optimal level of each factor was obtained by a comprehensive balance method. The results indicated that the EGR rate has the most significant influence on the BSFC and CA50. At the same time, the BSFC was only 211.7 g/kWh, which has been improved significantly, and CA50 was 12.55° CA ATDC, which effectively enhances the knock resistance when applying the optimization parameters.

show abstract

“…To overcome the autoignition resulting in the so-called “super knocking” in the spark-ignition engine, exhaust gas recirculation (EGR) is a promising strategy due to its high-dilution, low-temperature characteristics, which favor the distribution of species and temperature homogeneity inside the engine . In order to meet the stringent greenhouse gas regulations, EGR is also an effective method of mitigating the emissions when applied to engines. , EGR consists of various components, and it has been proved that the species in EGR could affect the combustion process in different ways by various experimental and numerical studies. , Especially, if a long-route or a short-route EGR loop (after or before the catalyst) is used, pollutant emissions (CO, HC, PM, NO x , and others) could be found in the air–EGR mixture at the intake. Among these components, a small trace amount of NO is of particular interest to the combustion community since the sensitizing effect of the NO x on fuels combustion has been addressed. , …”

Section: Introductionmentioning

confidence: 99%

“…1 In order to meet the stringent greenhouse gas regulations, EGR is also an effective method of mitigating the emissions when applied to engines. 2,3 EGR consists of various components, and it has been proved that the species in EGR could affect the combustion process in different ways by various experimental and numerical studies. 4,5 Especially, if a long-route or a shortroute EGR loop (after or before the catalyst) is used, pollutant emissions (CO, HC, PM, NO x , and others) could be found in the air−EGR mixture at the intake.…”

Section: Introductionmentioning

confidence: 99%

Effect of Exhaust Gas Recirculation and NO on Ignition Delay Times of Iso-octane in a Rapid Compression Machine

Song

et al. 2020

Energy Fuels

View full text Add to dashboard Cite

The ignition delay times (IDTs) of iso-octane with or without exhaust gas recirculation (EGR) in the 600–950 K temperature range and at pressures of 20 and 30 bar were measured under various equivalence ratios (Φ = 0.6–1.4) with the aid of a rapid compression machine. As for neat iso-octane IDTs measurements at 20 bar, it was found that the IDTs obtained in this work were consistent with the ones measured by other groups. Notable prolonging effects can be seen at the negative temperature coefficient region with EGR, which is independent of equivalence ratios. Moreover, the IDTs with EGR under fuel-rich and stoichiometric conditions showed a similar trend at both 20 and 30 bar. In the presence of NO in EGR, at a temperature of 632 K and temperatures above 732 K, the promoting effect of NO was observed, resulting in reductions of the IDTs. In parallel, the influence of NO was negligible in the 667–732 K temperature range. A comprehensive detailed kinetic model was employed to interpret the experimental data. The model performance was improved by adopting a high-level theoretical calculation of the 2HO2 = H2O2 + O2 reaction. Merging the N submechanism into the core model by considering the interactions between NO x and C0–C2 species can generally capture the influence of NO on the IDTs. Reaction path analysis indicated that the NO + HO2 = NO2 + OH reaction dominated in the presence of NO and its reaction rate increased as a function of temperature, which can explain the different IDTs behaviors with NO addition.

show abstract

Comparative study of exhaust gas recirculation (EGR) and hydrogen-enriched EGR employed in a SI engine fueled by biobutanol-gasoline

Cited by 23 publications

References 51 publications

Effects of Different Mixture Ratios of Methanol-Diesel on the Performance Enhancement and Emission Reduction for a Diesel Engine

Effects of Different Mixture Ratios of Methanol-Diesel on the Performance Enhancement and Emission Reduction for a Diesel Engine

Quantitative Analysis of the Influence Saliency of VVA and EGR on the Fuel Economy and Mixture Combustion Characteristics of a Turbocharged Spark Ignition Engine

Effect of Exhaust Gas Recirculation and NO on Ignition Delay Times of Iso-octane in a Rapid Compression Machine

Contact Info

Product

Resources

About