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EN
Catalytic exhaust gas aftertreatment devices fitted to combustion engines are susceptible to partial deactivation as their operating time progresses. This includes selective catalytic reduction (SCR) reactors meant for NOx emission control. There are several known deactivation mechanisms of SCR reactors already analyzed in detail in the literature. This paper, however, approaches the analysis of reactor deactivation by comparison of exhaust gas characteristics over repeatable cycle for fresh and aged samples of a SCR reactor for non-road mobile machinery. The research aims to outline which parameters describing the SCR reactor’s performance are most affected by its ageing. In order to do that, fresh and aged samples of the reactor were tested under the Non Road Steady Cycle. The acquired emission results, including concentration traces of particular compounds were analyzed. The specific NOx emission of the aged reactor was significantly higher than that of the fresh one. The NOx conversion efficiency of both reactors was found similar at periods of steady engine operation. It was recognized that during transient conditions the NOx conversion efficiency of the aged reactor was decreased. It was found that the main factor contributing to that phenomenon is the drop in the ammonia storage capacity of the aged SCR sample.
EN
With the rapid development of shipbuilding industry exhaust world is also very harmful one kind of environmental issues, and the ship marine diesel engine exhaust gas is mainly produced, so in recent years it has developed a diesel engine SCR system. SCR system can control emissions of nitrogen oxides in the exhaust of vessel, furthermore air pollution can be reduced. The main goal of article was using fluent software to correct SCR system selection and flue gas flow under different size best deflector arrangement is simulated. Next goal is further optimize the structure of the SCR system.
PL
Transport drogowy jest stale rozwijającym się sektorem gospodarki narodowej. Systematyczny wzrost liczby pojazdów samochodowych w tym pojazdów ciężkich ciężarowych stwarza istotne zagrożenie dla bezpieczeństwa ochrony środowiska. Niniejszy artykuł ma wskazać jakie działania podejmują organy kontrolne w Unii Europejskiej m.in. Inspekcja Transportu Drogowego w Polsce aby zapobiegać nielegalnemu instalowaniu urządzeń likwidujących prawidłowe działanie systemu SCR, a co za tym idzie zwiększeniu ilości szkodliwych substancji emitowanych do środowiska. Obowiązkiem państw członkowskich Unii Europejskiej jest wyznaczenie instytucji, które będą przeprowadzały badania i kontrole urządzeń, a także będą wprowadzały rozwiązania gwarantujące uszczelnienie systemu. Doświadczenie, presja ekonomiczna oraz rywalizacja w transporcie drogowym doprowadziły przewoźników do nieprzestrzegania zasad, a w szczególności dotyczących prawidłowego działania systemu SCR (Selective Catalyst Reduction). Artykuł zawiera obowiązki jakie spoczywają na kierujących pojazdami, podejmuje problematykę bezpieczeństwa systemu i optymalnego działania urządzeń oraz konsekwencje jakie mogą wynikać z nieprzestrzegania przepisów, a także poddawania ich manipulacjom.
EN
The road transport is a constantly unrolling sector of the national economy. Consistent height of the number of motor vehicles in it of heavy vehicles load-carrying is posing an essential threat to the safety of the environmental protection. The present article is supposed what action to show are entertaining review bodies in the European Union among others Inspection of the road transport in Poland in order to prevent illegal installing devices eliminating the correct functioning of the SCR system, and consequently for increasing the amount of harmful substances emitted to the environment. Appointing institutions which will be conducting an examination and inspections of devices are an obligation of member states of the European Union, as well as will be implementing solutions guaranteeing tightening the system up. Experience, the economic pressure and rivalry in the road transport took hauliers to the non-observance of principles, in particular concerning the correct functioning of the SCR system (Selective Catalyst Reduction). The article contains duties which lie with drivers by vehicles, is taking issues of the system security and optimum action of devices and consequences which can result from the non-observance of provisions, as well as surrendering them to manipulations.
EN
Standards linked with the environmental protection and vehicles are increasingly restrictive. EURO VI standard and regulations define the acceptable limits for exhaust emissions of new vehicles sold. Because of that, Selective Catalyst Reduction systems are used in a new vehicles with the heavy-duty type engines. This paper presents a study of the SCR system in public transport vehicles of the Municipal Transport Company (MPK) in Lublin, Poland. The tests were performed to study the power consumption of the SCR (the urea applicator into the catalyst) and calculate the results per unit of fuel. The amount of fuel for the Solaris Trollino 12 trolleybus was estimated and the energy demand found was of the order of 343 kWh/year. This gives low diesel fuel consumption, i.e. only 34.3 litres per year. The study also shows a graph of the daily demand of energy by the SCR system in public transport vehicles.
5
Content available remote SCR w pojazdach ciężarowych Volvo
PL
W pracy opisano metodę selektywnej katalitycznej redukcji tlenków azotu amoniakiem otrzymywanym z wodnego roztworu mocznika. Opisano system SCR stosowany w pojazdach użytkowych firmy VOLVO.
EN
In this paper the method of nitric oxides selective catalytic reduction was described. In this method nitric oxides are reduced by ammonia received from urea water solution. The paper consists description of SCR system used in the vehicles made by Volvo.
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