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Methodology for assessment of the spray position in selective catalytic restoration systems

Authors: Askerkо M.V.
Published in issue: #3(32)/2019
DOI: 10.18698/2541-8009-2019-3-446


Category: Power, Metallurgic and Chemical Engineering | Chapter: Heat Engines

Keywords: piston engine, diesel engine, exhaust gases, exhaust gases treatment systems, nitrogen oxides, urea injection, thermal decomposition, SCR system
Published: 04.03.2019

Against the background of a continuous increase in the vehicle fleet, the issue of emissions of harmful substances entering with exhaust gases continues to be one of the most pressing. To solve it, many methods and tools have been developed, including various exhaust gas post-treatment systems. In this paper, we consider the system of selective catalytic neutralization, the principle of operation and the main factors affecting their effectiveness. Particular attention is paid to the issue of evaporation of the reagent injected into the exhaust tract. A mathematical model has been developed that makes it possible in the first approximation to determine the location of the nozzle, which ensures the complete evaporation of the reagent before entering the catalyst unit. On the basis of the proposed methodology, an appropriate calculation was performed for a promising diesel engine.


References

[1] Frolov S.G., Roslyakov A.D. Decrease in toxicity of transport diesel engines by neutralisation nitrogen oxide of the fulfilled gases. Vestnik of Samara University, 2009, no. 3-2(19), pp. 138–142 (in Russ.).

[2] Markov V.A., Bashirov R.M., Gabitov I.I. Toksichnost’ otrabotavshikh gazov dizeley [Toxicity of burnt gas from engines]. Moscow, Bauman MSTU Publ., 2002 (in Russ.).

[3] Malastovskiy N.S., Barchenko F.B., Grekhov L.V., et al. Determining the Diesel fuel injection rate shaping requirements for emission control purposes. Inzhenernyy zhurnal: nauka i innovatsii [Engineering Journal: Science and Innovation], 2017, no. 3. DOI: 10.18698/2308-6033-2017-3-1594 URL: http://engjournal.ru/catalog/pmce/he/1594.html (in Russ.).

[4] Johnson T., Joshi A. Review of vehicle engine efficiency and emissions. SAE Int. J. Engines, 2018, vol. 11, no. 6, pp. 1307–1330. DOI: 10.4271/2018-01-0329 URL: https://www.sae.org/publications/technical-papers/content/2018-01-0329/

[5] Birkhold F., Meingast U., Wassermann P., et al. Modeling and simulation of the injection of urea-water-solution for automotive SCR DeNOx-systems. Appl. Catal. B Environ., 2007, vol. 70, no. 1-4, pp. 119–127. DOI: 10.1016/j.apcatb.2005.12.035 URL: https://www.sciencedirect.com/science/article/pii/S0926337306002402

[6] Sistema neytralizatsii otrabotavshikh gazov Selective Catalytic Reduction [Selective Catalytic Reduction: system for neutralization of burnt gas]. help4auto.com: website (in Russ.). URL: http://www.help4auto.com/download/ssp/424_Sistema_nejtralizacii_OG_SCR.pdf (accessed: 12.12.2018).

[7] Koebel M., Elsener M., Kleemann M. Urea-SCR: a promising technique to reduce NOx emissions from automotive diesel engines. Catal. Today, 2000, vol. 59, no. 3-4, pp. 335–345. DOI: 10.1016/S0920-5861(00)00299-6 URL: https://www.sciencedirect.com/science/article/pii/S0920586100002996

[8] Markov V.A., Myagkov L.L., Malastovskiy N.S., et al. Urea using in piston engines’ exhaust gases treatment systems. Bezopasnost’ v tekhnosfere [Safety in Technosphere], 2017, vol. 6, no. 4, pp. 40–49 (in Russ.).

[9] Twigg M.V. Urea-SCR technology for deNOx after treatment of diesel exhausts. Johnson Matthey Technol. Rev., 2015, vol. 59, no. 3, pp. 221–232. DOI: 10.1595/205651315x688280 URL: https://www.technology.matthey.com/article/59/3/221-232/

[10] Markov V.A., Myagkov L.L., Malastovskiy N.S., et al. Modeling evaporation and decomposition of urea solution for diesel exhaust system. Avtomobil’naya promyshlennost’, 2017, no. 10, pp. 8–14 (in Russ.).

[11] Kavtaradze R.Z. Teoriya porshnevykh dvigateley. Spetsial’nye glavy [Theory of piston engines. Special chapters]. Moscow, Bauman MSTU Publ., 2016 (in Russ.).

[12] Ryss K.N., Denisov A.A., Grekhov L.V., et al. Computational assessment of metering characteristics of spray valve for diesel fuel injection equipment. Izvestiya VolgGTU [Izvestia VSTU], 2013, vol. 5, no. 12(115), pp. 57–60 (in Russ.).

[13] Syrkin P.E., Shcherbakov V.V. Osnovy prikladnoy gazovoy dinamiki [Fundamentals of applied gas dynamics]. Nizhniy Novgorod, NNSTU Publ., 2010 (in Russ.).

[14] Akimov V.S., Bartenev G.Yu. [Modelling of jet breakup formed by nozzle using PK FLOWVISION]. Inzhenernye sistemy – 2015. Trudy Mezhd. foruma [Engineering systems-2015. Proc. Int. forum]. Moscow, MAKS Press, 2015, pp. 243 (in Russ.).

[15] Vargaftik N.B. Spravochnik po teplofizicheskim svoystvam gazov i zhidkostey [Handbook on thermal-physical properties of gases and liquids]. Moscow, Nauka Publ., 1972 (in Russ.).

[16] Benjamin S.F., Roberts C.A. Significance of droplet size when injecting aqueous urea into a selective catalytic reduction after-treatment system in a light-duty diesel exhaust. Fuel systems for IC engines. Woodhead Publishing, 2012, pp. 43–60.

[17] Levanov A.V., Antipenko E.E. Vvedenie v khimicheskuyu kinetiku [Introduction into chemical kinetics]. Moscow, Lomonosov MSU Publ., 2006 (in Russ.).

[18] Sung D.Y., Kim S.J., Baik J.H., et al. Decomposition of urea into NH3 for the SCR process. Ind. Eng. Chem. Res., 2004, vol. 43, no. 16, pp. 4856–4863. DOI: 10.1021/ie034052j URL: https://pubs.acs.org/doi/10.1021/ie034052j