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Increasing the efficiency of the diesel engine emission system
Stráník, Daniel ; Fridrichová, Kateřina (referee) ; Böhm, Michael (advisor)
This thesis addresses the issue of emission from heavy-duty vehicles with diesel engine. Perfect combustion in the engine is unattainable, leading to the inevitable production of pollutants during diesel combustion that must be effectively eliminated. Emission systems are used to reduce pollutants present in exhaust gases. As emission limits continue to decrease, and with the impending introduction of the new Euro VII emission standard, it is still important to reduce emission from internal combustion engines. This is particularly significant as electric and other alternative drives are not yet sufficiently developed for heavy-duty vehicles. This thesis proposes a strategy for achieving the greater reduction of pollutants and the desired increase in the efficiency of the entire emission system. For this purpose, a numerical model was created using GT-Suite software, and simulations were conducted to replicate the WHSC and WLTC class 1 driving cycles for the simulation of steady and transient states. The emissions resulting from the modified emission system were compared with those from the default system. The conclusion of the thesis is a brief description and evaluation of the results, accompanied by an outline of potential future procedures.
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Stage IV Emission Standards for Tractor Engines
Vít, Jakub ; Beran, Martin (referee) ; Dundálek, Radim (advisor)
The aim of this bachelor thesis is to explain the mechanism of injection of carbamide and its installation on a vehicle. The first part of this work deals with the reduction of pollutants in the exhaust gases and with the emissions standards which limit the level of pollutants in the exhaust gases. The second part consists of an overview of tractor brands available at Czech market and their classification based on the type of system they use on their new models to reduce the pollutants in the exhaust gases.
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The influence of the furnace gas recirculation on characteristic parameters of the combustion process
Macenauerová, Tereza ; Skryja, Pavel (referee) ; Bělohradský, Petr (advisor)
This thesis deals with the evaluation of emissions of NOx and CO formed during the combustion process when the burner utilizing fuel staging and internal flue gas recirculation is used. In the theoretical part the NOx formation mechanisms and methods used to suppress their formation are described. This is followed with the currently valid legislation in the Czech Republic in terms of the emission limits for NOx and CO in stationary sources. In the work, combustion tests were performed at the burners testing facility at UPEI BUT. The tests revealed that the most important parameters, which influence the NOx formation, are fuel staging, increasing combustion air excess and the utilization of new equipment that induces the flue gas to be drawn back into the burner. The equipment is installed in the burner’s air channel. The dependence of flue gas temperature, heat flux to the combustion chamber’s section walls and in-flame temperatures distribution in the horizontal symmetry plane of the combustion chamber on various parameters were investigated. The parameters included the geometry of the equipment for flue gas recirculation, primary/secondary ratio, geometry of nozzles for secondary fuel supply, tangential orientation of these nozzles towards the burner axis, and the excess of combustion air.
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Tractors` Injection Systems Overwiev
Poláček, Milan ; Svída, David (referee) ; Dundálek, Radim (advisor)
The object of the bachelor’s thesis is to create an overview of injection systems at currently produced tractors. The first part of the overview is concerned with conceptions of diesel injection by tractors’ engines and with a description of its parts. There are also referred related technologies for power boosting. The second part is devoted to particular marks of tractors and used injection systems.
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The influence of the furnace gas recirculation on characteristic parameters of the combustion process
Macenauerová, Tereza ; Skryja, Pavel (referee) ; Bělohradský, Petr (advisor)
This thesis deals with the evaluation of emissions of NOx and CO formed during the combustion process when the burner utilizing fuel staging and internal flue gas recirculation is used. In the theoretical part the NOx formation mechanisms and methods used to suppress their formation are described. This is followed with the currently valid legislation in the Czech Republic in terms of the emission limits for NOx and CO in stationary sources. In the work, combustion tests were performed at the burners testing facility at UPEI BUT. The tests revealed that the most important parameters, which influence the NOx formation, are fuel staging, increasing combustion air excess and the utilization of new equipment that induces the flue gas to be drawn back into the burner. The equipment is installed in the burner’s air channel. The dependence of flue gas temperature, heat flux to the combustion chamber’s section walls and in-flame temperatures distribution in the horizontal symmetry plane of the combustion chamber on various parameters were investigated. The parameters included the geometry of the equipment for flue gas recirculation, primary/secondary ratio, geometry of nozzles for secondary fuel supply, tangential orientation of these nozzles towards the burner axis, and the excess of combustion air.
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