The Studies on the Impact of Tailored DCA Treated Ethanol Blends on Engine Emissions

2021 ◽  
Vol 22 (6) ◽  
pp. 1609-1618
Author(s):  
Zbigniew Stępień ◽  
Wiesŀawa Urzędowska
Author(s):  
Charles Gray ◽  
G. D. Kittredge

The Environmental Protection Agency has completed a study of the impact of aircraft emissions on air quality and a study of the technological feasibility of controlling aircraft emissions including an analysis of the cost and time requirements of the various control approaches. The air quality study has determined the need for aircraft emission standards, and the control technology study has determined that control is feasible and cost effective given adequate development time.


2013 ◽  
Vol 864-867 ◽  
pp. 1804-1809 ◽  
Author(s):  
Song Zhou ◽  
Yan Liu ◽  
Jin Xi Zhou

This paper introduces the impact on the marine environment caused by marine diesel engine exhaust pollution and the regulations made by IMO to control the marine diesel engine emissions. And it summarizes the main technical measures to reduce SOx, NOx and particulate matter emissions from the marine diesel. It also points that the combination application of various technologies will be the research direction to reduce the emission of marine diesel engine in the future.


2009 ◽  
Vol 9 (4) ◽  
pp. 17665-17704 ◽  
Author(s):  
S. Samy ◽  
B. Zielinska

Abstract. Secondary organic aerosol (SOA) production was observed at significant levels in a series of modern diesel exhaust (DE) aging experiments conducted at the European Outdoor Photoreactor/Simulation Chamber (EUPHORE). The greatest production occurred in DE with toluene addition experiments (>40%), followed by DE with HCHO (for OH radical generation) experiments. A small amount of SOA (3%) was observed for DE in dark with N2O5 (for NO3 radical production) experiments. The analysis for a limited number (54) of polar organic compounds (POC) was conducted to assess the composition of modern DE and the formation of photochemical transformation products. Distinct POC formation in light versus dark experiments suggests the role of OH initiated reactions in these chamber atmospheres. A trend of increasing concentrations of dicarboxylic acids in light versus dark experiments was observed when evaluated on a compound group basis. The four toluene addition experiments in this study were performed at different [tol]o/[NOx]o ratios and displayed an average SOA% yield (in relation to toluene) of 5.3±1.6%, which is compared to past chamber studies that evaluated the impact of [tol]o/[NOx]o on SOA production in more simplified mixtures.


Author(s):  
O. Terentiev ◽  
M. Sergienko ◽  
V. Smoliar

The article discusses topical issues and problems of the impact of industrial road transport on the environment, namely: emissions of pollutants into the atmosphere depending on the type of fuel and their negative impact on human health. The significant increase in the vehicle fleet is causing great harm in the form of harmful emissions from fuel combustion systems, which cannot be dealt with standard car cleaning systems. The situation is aggravated by the fact that car emissions are concentrated in the surface air layer - precisely in the zone of our breathing. Low- quality gasoline is still used, polluting the environment. About 280 harmful substances were found in the exhaust gases of cars, including carcinogenic benzopyrenes, nitrogen oxides, lead, mercury, aldehydes, carbon oxides, soot, hydrocarbons. These emissions increase significantly when starting off or increasing speed. Diesel engine emissions are different from gasoline engine emissions. A diesel engine burns fuel more completely, oxidizes less carbon and produces less non-combustible hydrocarbons. But, at the same time, due to the lack of air in the diesel engine, more nitrogen oxide is formed. Diesel engines also emit soot. Gas emissions from transport into the atmosphere are exposed to sunlight, which leads to photochemical reactions leading to the formation of NО2, 0з, peroxides, benzopyrene (C22H14) and other compounds. In addition, each vehicle emits rubber dust into the atmosphere when its tires are abraded and worn out. Accordingly, the scale of damage caused by transport to the environment and people is also increasing. The article analyzes the existing and promising types of fuel and the reduction of the technogenic impact of industrial road transport on the environment in Ukraine.


1970 ◽  
Vol 24 (2) ◽  
pp. 151-160 ◽  
Author(s):  
Vanja Jurić ◽  
Dino Županović

This article deals with the ecological impacts of chemical substances that are found in the structure of Diesel engine exhaust gases and provides an overview of legislation that limits their maximum allowable emissions. Special consideration is given to the previously mostly neglected negative impact of particulate matter compared to the impact of carbon dioxide. Negative impact of particulates is especially noted as direct negative impact on human health whereby the expenses associated with medical treatment exceed the financial savings resulting from the usage of Diesel powered vehicles. Therefore, the paper presents the knowledge acquired through previous scientific research in the economically most developed countries, as well as the tendencies for the reduction of negative impacts of Diesel exhaust gases.


2018 ◽  
Vol 21 (5) ◽  
pp. 885-894
Author(s):  
Carlos Guardiola ◽  
Benjamín Pla ◽  
Marcelo Real ◽  
Cyril Travaillard ◽  
Frederic Dambricourt

The short circuit of fresh air is a more and more extended strategy to deal with low-end torque issues, very common in small turbocharged and spark-ignited four-stroke engines. Therefore, from the author’s point of view, it is interesting to check whether the after-treatment system can work properly under these conditions. In the present study, the effect of the fresh air short-circuit on engine emissions has been assessed through its impact on the wideband [Formula: see text] sensor and the three-way catalyst behaviour, which are the key elements of the fuel-to-air ratio control strategy. In particular, the analysis of the sensor dynamic response shows that the [Formula: see text] sensor overestimates the fuel-to-air ratio under short-circuit conditions. The sensor overestimation leads the actual fuel-to-air ratio out of the proper three-way catalyst window; in this sense, results show a non-negligible emissions increase, especially in terms of NOx. Regarding the impact on the three-way catalyst behaviour, the study shows how short-circuit pulses change the exhaust gas composition for a given fuel-to-air ratio at catalyst inlet, which also contributes to a penalty in the three-way catalyst efficiency.


Author(s):  
Holger Mai ◽  
Mathias Vogt ◽  
Roland Baar ◽  
Andreas Kinski

The main goal of current engine development is to increase power density and efficiency and to minimize engine emissions. The idea is to obtain the desired power output with a highly charged combustion engine in combination with exhaust gas turbocharging and a very small engine displacement, which is known as downsizing. The selection of a turbocharger is based on the maps of the turbine and compressor, which are usually measured on a test bench. They also provide important boundary conditions on the engine process simulation of a supercharged engine with this turbocharger. In general, a very accurate measurement of the characteristic maps is desired to ensure the best possible matching. However, random and systematic errors have an impact on the measurement results. In order to assess the quality of the measured and calculated values, it is necessary to determine the uncertainties of the measurement variables as accurately as possible; particularly, the error propagation in calculating the efficiencies. The uncertainties are based on a systematic uncertainty component of the sensor and the confidence interval. In this way, the measurement uncertainty is estimated by linear and geometric combination of the calculated random and systematic uncertainties. After that, the respective uncertainty contributions and the identification of the relevant parameters that influence the resulting measurement uncertainty are evaluated. Knowing the measurement uncertainties of the characteristic maps of a turbocharger, the influence on engine operation will be determined with a one-dimensional engine process simulation model. Consequently, the determined measurement uncertainty will be applied as a deviation on the efficiencies and will be investigated in a GT POWER simulation. The impact of the measurement uncertainty on the engine performance is shown on the basis of load steps.


2010 ◽  
Vol 10 (2) ◽  
pp. 609-625 ◽  
Author(s):  
S. Samy ◽  
B. Zielinska

Abstract. Secondary organic aerosol (SOA) production was observed at significant levels in a series of modern diesel exhaust (DE) aging experiments conducted at the European Outdoor Photoreactor/Simulation Chamber (EUPHORE). The greatest production occurred in DE with toluene addition experiments (>40%), followed by DE with HCHO (for OH radical generation) experiments. A small amount of SOA (3%) was observed for DE in dark with N2O5 (for NO3 radical production) experiments. The analysis for a limited number (54) of polar organic compounds (POC) was conducted to assess the composition of modern DE and the formation of photochemical transformation products. Distinct POC formation in light versus dark experiments suggests the role of OH initiated reactions in these chamber atmospheres. A trend of increasing concentrations of dicarboxylic acids in light versus dark experiments was observed when evaluated on a compound group basis. The four toluene addition experiments in this study were performed at different [tol]o/[NOx]o ratios and displayed an average SOA %yield (in relation to toluene) of 5.3±1.6%, which is compared to past chamber studies that evaluated the impact of [tol]o/[NOx]o on SOA production in more simplified mixtures.


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