Einflüsse motorischer Betriebsparameter auf die Reaktivität von Dieselruss

Fiebig, Michael; Schönen, Markus; Grütering, Ulrich; Pischinger, Stefan

doi:10.1007/bf03225593

Cited by 11 publications

(11 citation statements)

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“…While the former may be somehow constant over the regeneration, the determination of the latter requires knowledge of the regeneration evolution. Here several approaches have been followed, based on geometrical reasoning, [17], BET (Brunauer-Emmett-Teller surface measurement technique based on physical adsorption of gas molecules on a solid surface) soot surface measurements, [18], as well as using micro-and nanostructural aspects of the soot primary particles and agglomerates, [9,10,11,12].…”

Section: Introductionmentioning

confidence: 99%

“…Activation energies varying from 38kJ/kmol to 168kJ/kmol can be found for thermal oxidation of PM, [16]. Dependencies of the activation energy from the PM composition, [6], the PM amount available for oxidation, [6,16], the prevailing temperature [6,16], the DPF material, [18], and the catalytic coating of the DPF, [20,21] have been investigated. However, the results are dificult to compare since all the mentioned dependencies have to be taken into account and different conditions prevailed in the studies, at least those, we are aware of.…”

Section: Introductionmentioning

confidence: 99%

“…Should though, the available soot be substantially more (to our knowledge, no exact thresholds have been reported) the activation energy decreases. Finally, in [18] differences in activation energies have been attributed to different conditions of the in-cylinder combustion. Even more complex is the discussion concerning the pre-exponential factor, A.…”

Section: Introductionmentioning

confidence: 99%

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Investigation of the Oxidation Behavior of Soot in Diesel Particle Filter structures

Eggenschwiler¹,

Schreiber²

2015

SAE Technical Paper Series

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Particulate matter in diesel exhaust is captured in diesel particulate ilters (DPFs). Since increased load in the ilter and thus increased pressure drop deteriorates the engine performance, the ilter load of the DPF has to be removed during a process referred to as regeneration. Measures for successful regeneration aim at accelerating soot oxidation and increase fuel consumption. Regeneration layout and thus fuel consumption increase is strongly depending on the oxidation behavior of soot. The aim of the present study is the investigation of soot oxidation characteristics. Therefore particle ilters have been loaded with soot using the exhaust gas of small heavy duty vehicle operated under deined conditions on an engine dynamometer. The particle ilters have been then dismantled and fragmented on their constituting segments. Each ilter segment has been regenerated individually in a speciically designed test bench. Heated gas of constant temperature has been induced through the segments. Based on the species balances measured, soot oxidation rates have been computed. In parallel, a scale with milligram resolution recorded the time evolution of the segment weight. Based on the soot oxidation rates characteristic kinetic parameters have been computed. Regeneration progress has been approached by a simple Arrhenius, a shrinking core and a random pore size distribution growth model. The inluence of two different oxygen levels in the feed gas has been investigated. Soot regeneration characteristics in segments from the ilter core have been similar exhibiting rather low activation energies of around 50kJ/mol. Soot in ilter segments located in the periphery had substantially higher activation energies, 80kJ/mol. This different behavior is attributed to the lower temperatures of the ilter periphery during the loading procedure and differences in the soot structure and composition.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Investigation of the Oxidation Behavior of Soot in Diesel Particle Filter structures

Eggenschwiler¹,

Schreiber²

2015

SAE Technical Paper Series

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“…However, thermal insulation coatings were not widely used due to their peeling, which led to engine seizure. The use of insulating pads [6,7] led to the complexity of the design of the pistons, weight gain and reduced the reliability of the piston. Experimental study by G.Woschni et al [8] of heat transfer in internal combustion engines using a piston with a head covered with a layer of ceramics "Nimonic-80A" with a thermal conductivity of 2 W/m•K was carried out for a single-cylinder diesel engine with an undivided combustion chamber having the diameter and piston stroke of 125 and 140 mm, respectively, with turns of 2,200 min -1 .…”

Section: Methodology For Combustion Chamber Thermal Insulation Efficiency Studymentioning

confidence: 99%

Cordunum pistons increase diesel engine economy and reliability

2019

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Taking into account the oil resources depletion the requirements to fuel consumption of internal combustion engines are now increasing as well as to their reliability and durability. With the continual increase in the number of internal combustion engines in operation, along with the problem of parts of the cylinder piston group wearing out has caused exhaust from such engines to be one of the main source of harmful pollutant emissions in cities. Therefore, environmental requirements have in turn increased dramatically. The engine resource and its efficiency largely depend on the process of fuel combustion in the combustion chamber. Experimental studies aimed to improve the working process on diesel engines by piston insulation have shown an effective decrease in fuel consumption by reducing heat loss and more complete fuel combustion. When oxide ceramic coatings were used on the piston and cylinder head, the maximum power increased and the specific fuel consumption decreased. However ceramic coatings are not widely used due to their peeling. We have developed a technology for the galvanic plasma treatment of pistons, which made it possible to obtain on the pistons surface made of aluminum alloys a ceramic corundum layer with high adhesion to the base metal that does not peel and has electret properties. In 1993, pistons with a corundum surface layer were installed in a shunting diesel locomotive and life-time running tests were conducted. Such pistons increased wear resistance, reduced the wear of cylinder liners, increased the strength of the annular jumpers, and were not prone to burnouts and scuffing. They provided an increase in the resource of the cylinder-piston group of the diesel engine by more than 125 thousand engine hours. The paper provides an analysis of the effect of corundum pistons thermal insulation on significant increasing the, engine power and fuel consumption reduction. Basing on experimental bench studies of a gasoline engine, a tractor diesel engine and long-term operational life tests of diesel engines, an attempt had been made to explain the reasons for the improvement in the engines’ efficiency.

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“…(FVV) research project No. 954 “Reactive soot,” 4 investigations were performed on a diesel engine which indicated, that in lean operation, reactive soot is generated under the condition of a retardation of the main injection as well as an early adjustment of the pre-injection. In rich operation, a retardation of the main and post injection showed positive effects on soot reactivity.…”

Section: Introductionmentioning

confidence: 99%

Impact of engine combustion on the reactivity of diesel soot from commercial vehicle engines

Lindner

Massner

Gärtner

et al. 2014

International Journal of Engine Research

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The regeneration behavior of diesel particulate filters is significantly influenced by the reactivity of the stored soot. However, there is still a lack of analyses which describe the effects that various engine operating parameters have on soot reactivity. A medium-duty OM936 single-cylinder engine with a common rail injection system was used to analyze the correlations between engine speed, swirl, combustion air–fuel ratio and soot reactivity. Diesel particulate samples were directly collected from the exhaust stream. The temperature programed oxidation was used to reveal the reactivity to oxygen of the soot samples. Diesel particulate filter regeneration experiments were additionally carried out on a medium-duty OM936 full engine test bench to analyze the influence of soot reactivity on the regeneration efficiency in particulate filters. The results give new insights into the relation between the diesel engine combustion process and soot reactivity and show how the active regeneration of diesel particulate filters is affected by soot reactivity.

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Einflüsse motorischer Betriebsparameter auf die Reaktivität von Dieselruss

Cited by 11 publications

References 1 publication

Investigation of the Oxidation Behavior of Soot in Diesel Particle Filter structures

Investigation of the Oxidation Behavior of Soot in Diesel Particle Filter structures

Cordunum pistons increase diesel engine economy and reliability

Impact of engine combustion on the reactivity of diesel soot from commercial vehicle engines

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