Experimental investigation on the effect of UWSinjectionon NOx reduction efficiency of urea-SCR system for marine diesel engine
Journal Title: International Journal of Engineering and Science Invention - Year 2017, Vol 6, Issue 9
Abstract
Oxides of nitrogen (NOx) emitted from operating marine diesel vessels which negatively affect human health and environment are considered a global pollution problem. They areregarded a major reason for photochemical smog and acid rain formation. Therefore, IMO (international maritime organization) has issued strict regulations to reduce NOx emissions from marine diesel engines. In order to comply with these strict requirements, differentafter-treatment technologies for NOxemission abatementhave beenintroduced and SCRproved to beone of the most effectivemethods for marine diesel engines. Improving SCR performance and increasing NOxabatement efficiency have been a topic of study for various researches. In thiswork, an experimental investigation onurea SCR systemiscarried out to examinethe effect of UWS injection in terms ofinjector position andinjectordirection on NOx reduction efficiency under various engine loads on a four stroke medium speed marine diesel engine. Results show that injecting UWS at 5D location upstream of SCR entrance has achieved the highestNOx reduction efficiencyof 70% due to longerresidence time which promotesmixing and chemical reaction between droplet and exhaust gas. Reversed injection at 30ᴏ direction showed better efficiency over positive injection directions due to stronger interaction of spray into incoming gas flowleading to better atomization and homogeneous mixing between droplet and flow. Efficiency is also improved while injecting at 90ᴏ angle due to less wall impingement since the spray is axially distributed.As engine load increased to 75% full load, efficiency is increased to the maximum value whereas at full load, efficiency is observed to reduce due to increased gas flow inertia that hinders a deep penetration of the injected droplets into the exhaust gas.Based on these results, the present work helpsin providing basic guidelineson the optimal injection variables for an optimizedSCR performance.
Authors and Affiliations
Jaedaa Abdulhamid, Prof. T. V. K. Bhanuprakash, Prof. P. V. J. Mohan Rao
Keywords
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