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Wyświetlanie 1-10 z 13
Tytuł:
A conceptual design and numerical analysis of the mixerless urea-SCR system
Autorzy:
Kaźmierski, Bartosz
Górka, Krzysztof
Kapusta, Łukasz Jan
Powiązania:
https://bibliotekanauki.pl/articles/2097591.pdf
Data publikacji:
2021
Wydawca:
Polskie Towarzystwo Naukowe Silników Spalinowych
Tematy:
NOx
SCR
selective catalytic reduction
wall film
CFD
selektywna redukcja katalityczna
Opis:
In the present study, an innovative design of a urea-selective catalytic reduction (SCR) system without conventional mixing elements was developed. The aim was to obtain a high degree of urea decomposition, and uniform ammonia distribution at the inlet to the catalyst, while minimising the liquid film deposition and keeping the compact design. The concept of the design was based on creating high turbulence and elongating the flow paths of the droplets. The design was verified through a series of numerical simulations based on the Reynolds-averaged Navier-Stokes (RANS) approach and a discrete droplet model (DDM) spray representation. The analysis included various operating conditions as well as subcooled and superheated sprays. A uniform ammonia distribution was achieved regardless of the operating points and spray properties. Additionally, in the case of a flash-boiling injection, a further reduction of the wall film was observed.
Źródło:
Combustion Engines; 2021, 60, 4; 12--20
2300-9896
2658-1442
Pojawia się w:
Combustion Engines
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical investigation of the back pressure influence on urea-water-solution mixing performance in close coupled SCR system
Autorzy:
Rogóż, R.
Bachanek, J.
Boruc, Ł.
Teodorczyk, A.
Powiązania:
https://bibliotekanauki.pl/articles/245838.pdf
Data publikacji:
2018
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
SCR
urea water solution
uniformity
CFD
back pressure
Opis:
The upcoming Euro 6d emission standard puts more even stringent requirements for diesel engine cars, especially in the case of nitrogen oxides (NOx) emission. The most widely used technique to meet tight standards is Selective Catalytic Reduction (SCR) with urea-water-solution (UWS) injection. One of the crucial factors is even ammonia distribution at the catalyst inlet; hence, very often product development is focused around this issue. The product development is supported by both experimental and numerical work. The common approach to measure cross section ammonia distribution on the SCR is using sampling system at catalyst outlet. Very often exhaust layout is opened just after the SCR catalyst, cutting off the rest part for instance tailpipe or Clean-up Catalyst. Therefore, a backpressure at SCR outlet resulting from the downstream part is also eliminated. This could significantly affect flow parameters as the density changes, thus ammonia distribution and wall film deposition may vary as well. Within this work, the influence of the backpressure at SCR outlet on the ammonia distribution and wall wetting was numerically investigated. The simulations were run under various boundary conditions for the Close Coupled SCR architecture. It was shown that depending on the operating point the boundary pressure affects both factors on the different level.
Źródło:
Journal of KONES; 2018, 25, 3; 377-383
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Potentials for NOx and CO2 reduction of combined NSC + passive SCR system in Diesel passenger car application
Autorzy:
Wittka, T.
Holderbaum, B.
Powiązania:
https://bibliotekanauki.pl/articles/133953.pdf
Data publikacji:
2014
Wydawca:
Polskie Towarzystwo Naukowe Silników Spalinowych
Tematy:
exhaust aftertreatment
NSC
Selective Catalytic Reduction
SCR
fuel reformer
oczyszczanie spalin
selektywna redukcja katalityczna
Opis:
The stringent pollutant and CO2 emission limitation in upcoming legislation norms for Diesel passenger car applications force the introduction of exhaust aftertreatment systems with maximum purification and energetic efficiency. The state-off-the-art technologies for NOx reduction, NOx storage and reduction catalyst (NSC) and selective catalytic reduction catalyst (SCR), show challenges for robust performance under strongly extended emission relevant operation conditions from cold start to high engine load and speed. One technical solution is the combination of NSC and passive SCR. This paper presents the experimental results obtained in the EUproject “Powerful”. On engine test bench and demonstrator vehicle, an exhaust aftertreatment system combining NSC, passive SCR and fuel reformer technology was developed and experimentally investigated steady-state and on road. The engine independent NSC operation offers potentials for lowered fuel consumption penalty by avoiding engine rich operation. The intrinsic NH3 formation during the NSC regeneration is used for additional NOx conversion on the passive SCR and reduces NOx and CO2 emission.
Źródło:
Combustion Engines; 2014, 53, 2; 68-76
2300-9896
2658-1442
Pojawia się w:
Combustion Engines
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Simulation and experimental study of SCR injection system
Autorzy:
Du, J.
Zhang, Y.
Cai, Y.
Powiązania:
https://bibliotekanauki.pl/articles/260223.pdf
Data publikacji:
2018
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
ammonia grille
flow field
uniformity
SCR test
the denitrification rate
Opis:
According to actual engineering test, we design a linear controlled spray ammonia grille, and apply it to the SCR injection system of ship tail gas treatment. In this paper, the geometric model of ammonia injection grid was built in the flue of diesel engine, and the effects of spray atomization, ammonia uniformity and urea droplet distribution on spray atomization were simulated. Then the test bench was set up to observe the injection status of the ammonia injection grille. The NOx content of the outlet was measured by the original data of the flue gas, and the experimental data were processed. We calculate the denitrification rate by taking the average value to verify the correctness of the spray ammonia grid scheme.
Źródło:
Polish Maritime Research; 2018, S 2; 49-55
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental research and CFD analysis of flow parameters in a SCR system for the original part and WALKER’s replacement
Autorzy:
Kurzydym, Damian
Klimanek, Adam
Żmudka, Zbigniew
Powiązania:
https://bibliotekanauki.pl/articles/133156.pdf
Data publikacji:
2019
Wydawca:
Polskie Towarzystwo Naukowe Silników Spalinowych
Tematy:
selective catalytic reduction
computational fluid dynamics
static mixer
uniformity index
coefficient of variation
selektywna redukcja katalityczna
obliczeniowa dynamika płynów
mieszalnik statyczny
wskaźnik nierównomierności
współczynnik wariancji
Opis:
The article presents the results of experimental research and their comparison with CFD simulations for the original selective catalytic reduction system and WALKER replacement. The research was performed to develop the WALKER universal mixer. The SCR prototype without mixer and with the proposed mixer were tested and compared with the original VW part. The next step was reverse engineering, which consisted in scanning the tested parts with a laser and processing their point cloud in Leios2 program. Reverse engineering has allowed the reconstruction of 3D geometry of the tested parts in the Catia v5 program and then preparation their models for computational fluid dynamics. Numerical simulations were carried out in the Ansys Fluent program, thanks to which several quantities were determined e.g. uniformity index of gas flow through the monolith and coefficient of variation as a measure of mixing degree, which have a significant impact on the design of the mixer and the SCR system.
Źródło:
Combustion Engines; 2019, 58, 4; 13-20
2300-9896
2658-1442
Pojawia się w:
Combustion Engines
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study on optimization simulation of SCR denitration system for marine diesel engine
Autorzy:
Du, J.
Li, R. N.
Wu, X.
Zhang, Y.
Powiązania:
https://bibliotekanauki.pl/articles/259646.pdf
Data publikacji:
2018
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
marine diesel engine
SCR system
flue gas
flow deflector
Opis:
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.
Źródło:
Polish Maritime Research; 2018, S 3; 13-21
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Zastosowanie nielegalnego emulatora pompy AdBlue w aspekcie ochrony bezpieczeństwa środowiska
Applying the illegal emulator of the AdBlue pump in the aspect of the protection of the safety of the environment
Autorzy:
Rychter, M.
Sułek, P.
Powiązania:
https://bibliotekanauki.pl/articles/310446.pdf
Data publikacji:
2018
Wydawca:
Instytut Naukowo-Wydawniczy "SPATIUM"
Tematy:
transport drogowy
pompa AdBlue
emulator
ochrona środowiska
system SCR
AdBlue pump
SCR system
environment
vehicle transport
Opis:
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.
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.
Źródło:
Autobusy : technika, eksploatacja, systemy transportowe; 2018, 19, 6; 1134-1135, CD
1509-5878
2450-7725
Pojawia się w:
Autobusy : technika, eksploatacja, systemy transportowe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Environmental Benefits of the SCR Systems: a Case Study of the Lublin City Transport
Autorzy:
Zielińska, K.
Haratym, A.
Powiązania:
https://bibliotekanauki.pl/articles/123515.pdf
Data publikacji:
2017
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
MPK
Municipal Transport Company
SCR system
nitrogen oxides
heavy duty diesel engines
Opis:
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.
Źródło:
Journal of Ecological Engineering; 2017, 18, 3; 202-207
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An analysis of SCR reactor deactivation impact on NOx emissions from a compression ignition engine
Autorzy:
Dzida, Jakub
Brzeżanski, Marek
Powiązania:
https://bibliotekanauki.pl/articles/134226.pdf
Data publikacji:
2019
Wydawca:
Polskie Towarzystwo Naukowe Silników Spalinowych
Tematy:
SCR system
SCR deactivation
SCR ageing
nitrogen oxides emission
ammonia emission
system SCR
dezaktywacja SCR
starzenie SCR
emisja tlenków azotu
emisja amoniaku
Opis:
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.
Źródło:
Combustion Engines; 2019, 58, 3; 208-212
2300-9896
2658-1442
Pojawia się w:
Combustion Engines
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The influence of SCR-DPF system on the exhaust emissions of inland waterway vessels
Autorzy:
Ignalewski, Wojciech
Kaup, Magdalena
Durajczyk, Piotr
Skulimowski, Tomasz
Powiązania:
https://bibliotekanauki.pl/articles/309868.pdf
Data publikacji:
2019
Wydawca:
Instytut Naukowo-Wydawniczy "SPATIUM"
Tematy:
SCR-DPF system
exhaust emission
inland waterway vessel
system SCR-DPF
emisja spalin
statek żeglugi śródlądowej
Źródło:
Autobusy : technika, eksploatacja, systemy transportowe; 2019, 20, 1-2; 246-250
1509-5878
2450-7725
Pojawia się w:
Autobusy : technika, eksploatacja, systemy transportowe
Dostawca treści:
Biblioteka Nauki
Artykuł
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