scholarly journals INVESTIGATION INTO THE POSSIBILITIES OF FUNCTIONING CATALYTIC CONVERTER / KATALIZINIO DEGINIŲ NEUTRALIZATORIAUS VEIKIMO GALIMYBIŲ TYRIMAS

2012 ◽  
Vol 4 (4) ◽  
pp. 370-375
Author(s):  
Saugirdas Pukalskas ◽  
Virginijus Švelnia ◽  
Ričardas Vėgneris
Keyword(s):  
Experimental Investigation ◽  
Chemical Reactions ◽  
Catalytic Converter ◽  
Contamination Level ◽  
Gas Temperature

The paper considers the principles of catalyst operations and chemical reactions proceeding within. Also, the modes used for defining the efficiency of the catalyst are reviewed. Experimental investigation has been carried out to help with assessing the efficacy of the catalyst according to the concentration of noxious fractions and differences in temperature before and behind the catalyst. Nine Otto engine vehicles have been tested. The applicable contamination level and efficiency of catalyst performance of the vehicles have been set. The conclusion reveals that flowing gas temperature within the vehicle having an effectively performing catalyst is always lower than out flowing gas temperature. Santrauka Straipsnyje nagrinėjami katalizatoriaus veikimo principai ir jame vykstančios cheminės reakcijos. Taip pat ap-žvelgiami katalizatoriaus efektyvumo nustatymo būdai. Atliktas eksperimentinis tyrimas, kuris padėjo nustatyti katalizatoriaus veikimo efektyvumą pagal išmetamosiose dujose esančių kenksmingų dalelių koncentraciją ir temperatūrų skirtumą prieš katalizatorių ir už jo. Tyrimo metu ištirti devyni Oto varikliais varomi automobiliai. Nustatytos automobiliams galiojančios taršos normos ir katalizatorių veikimo efektyvumas. Gauta, kad automobilio, kurio katalizatorius veikia efektyviai, į jį įtekančių dujų temperatūra visada yra žemesnė nei iš katalizatoriaus ištekančių dujų temperatūra.

The Effect of Engine Exhaust Temperature Modulations on the Performance of Automotive Catalytic Converters

2006 ◽  
Author(s):  
Tariq Shamim
Keyword(s):  
Single Channel ◽  
Catalytic Converter ◽  
Space Velocity ◽  
Operating Conditions ◽  
Gas Temperature ◽  
Engine Exhaust ◽  
Exhaust Temperature ◽  
Automotive Catalytic Converters ◽  
Exhaust Gas Temperature ◽  
Harmful Effects

This paper presents a computational investigation of the effect of exhaust temperature modulations on an automotive catalytic converter. The objective is to develop a better fundamental understanding of the converter’s performance under transient driving conditions. Such an understanding will be beneficial in devising improved emission control methodologies. The study employs a single-channel based, one-dimensional, non-adiabatic model. The transient conditions are imposed by varying the exhaust gas temperature sinusoidally. The results show that temperature modulations cause a significant departure in the catalyst behavior from its steady behavior, and modulations have both favorable and harmful effects on pollutant conversion. The operating conditions and the modulating gas composition and flow rates (space velocity) have substantial influence on catalyst behavior.

scholarly journals Experimental investigation of ionization front propagating in a 28 GHz gyrotron beam: Observation of plasma structure and spectroscopic measurement of gas temperature

2020 ◽  
Vol 127 (6) ◽  
pp. 063301 ◽  
Author(s):  
Kuniyoshi Tabata ◽  
Yuki Harada ◽  
Yusuke Nakamura ◽  
Kimiya Komurasaki ◽  
Hiroyuki Koizumi ◽  
...  
Keyword(s):  
Experimental Investigation ◽  
Spectroscopic Measurement ◽  
Ionization Front ◽  
Plasma Structure ◽  
Gas Temperature

scholarly journals Exhaust gas treatment for reducing cold start emissions of a motorcycle engine fuelled with gasoline-ethanol blends

2017 ◽  
Vol 26 (2) ◽  
pp. 84 ◽  
Author(s):  
A. Samuel Raja ◽  
A. Valan Arasu
Keyword(s):  
Traffic Congestion ◽  
Catalytic Converter ◽  
Cold Start ◽  
Exhaust Gas ◽  
Gas Temperature ◽  
Gas Treatment ◽  
Single Cylinder ◽  
Hc Emissions ◽  
Ethanol Blends ◽  
Exhaust Gas Temperature

In countries like India, transportation by a two wheeled motorcycle is very common owing to affordable cost, easy handling and traffic congestion. Most of these bikes use single cylinder air cooled four-stroke spark ignition (SI) engines of displacement volume ranging from 100 cm3 to 250 cm3. CO and HC emissions from such engines when started after a minimum stop-time of 12 hours or more (cold-start emissions) are higher than warmed-up emissions. In the present study, a 150 cm3 single cylinder air cooled SI engine was tested for cold start emissions and exhaust gas temperature. Different gasoline-ethanol blends (E0 to E20) were used as fuel expecting better oxidation of HC and CO emissions with additional oxygen present in ethanol. The effect of glow plug assisted exhaust gas ignition (EGI) and use of catalytic converter on cold start emissions were studied separately using the same blends. Results show that with gasoline-ethanol blends, cold start CO and HC emissions were less than that with neat gasoline. And at an ambient temperature of 30±1°C, highest emission reductions were observed with E10. EGI without a catalytic converter had no significant effect on emissions except increasing the exhaust gas temperature. The catalytic converter was found to be active only after 120 seconds in converting cold start CO, HC and NOx. Use of a catalytic converter proves to be a better option than EGI in controlling cold start emissions with neat gasoline or gasoline-ethanol blends.

An experimental investigation and correlation on buoyant gas temperature below ceiling in a slopping tunnel fire

2013 ◽  
Vol 51 (1-2) ◽  
pp. 246-254 ◽  
Author(s):  
L.H. Hu ◽  
L.F. Chen ◽  
L. Wu ◽  
Y.F. Li ◽  
J.Y. Zhang ◽  
...  
Keyword(s):  
Experimental Investigation ◽  
Gas Temperature ◽  
Tunnel Fire
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