Journal of Korean Society for Atmospheric Environment (한국대기환경학회지)

Korean Society for Atmospheric Environment (한국대기환경학회)
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The Reaction Characteristics of NOx/N2O and NH3 in Crematory Facility SCR Process with Load Variation

부하변동이 큰 화장시설 SCR 공정에서 NOx/N2O 및 NH3 동시 저감 특성 연구

  • Park, Poong Mo (Department of Environmental Engineering, University of Seoul) ;
  • Lee, Ha Young (Occupational Safety & Health Research Institute) ;
  • Yeo, Sang-Gu (Department of Environmental Engineering, University of Seoul) ;
  • Yoon, Jae-Rang (Department of Environmental Engineering, University of Seoul) ;
  • Dong, Jong In (Department of Environmental Engineering, University of Seoul)
  • 박풍모 (서울시립대학교 환경공학과) ;
  • 이하영 (산업안전보건연구원) ;
  • 여상구 (서울시립대학교 환경공학과) ;
  • 윤재랑 (서울시립대학교 환경공학과) ;
  • 동종인 (서울시립대학교 환경공학과)
  • Received : 2017.11.14
  • Accepted : 2017.12.13
  • Published : 2017.12.31
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Abstract

Efficient simultaneous reduction conditions for $NO_x$ and $NH_3$-slip was investigated in SCR (Selective Catalytic Reduction) process with load variation by applying dual catalysts (SCR catalyst, $NH_3$ decomposition catalyst) system. $N_2O$ formation characteristics were analyzed to look into possible undesirable reaction pathways. In the experiments of catalyst characteristics, various operational variables were tested for the combined catalytic system, such as $NH_3/NO_x$ ratio, temperature, oxygen concentration and $H_2O$. The reaction characteristics of $NO_x$, $NH_3$ and $N_2O$ were analyzed and optimal conditions could be evaluated for the combustion facility with varied load. In terms of $NO_x/NH_3$ simultaneous reduction and $N_2O$ formation suppression, optimal condition was considered NSR 1.2 and temperature $300^{\circ}C$. At this operational condition, $NO_x$ conversion was 98%, $NH_3$ reduction efficiency was 95%, generated $N_2O$ concentration 9.5 ppm with inlet $NO_x$ concentration of 100 ppm. In $NH_3-SCR$ process with $NH_3$ decomposition catalyst, $NO_x$ and $NH_3$ can be considered to be reduced simultaneously at limited conditions. The results of this study may be utilized as basic data at facilities requiring simultaneous $NO_x$ and $NH_3$ reduction for facilities with load variation.

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References

  1. Amblard, M., Burch, R., Southward, B.W.L. (1999) The selective conversion of ammonia to nitrogen on metal oxide catalysts under strongly oxidising conditions, Applied Catalysis B: Environmental, 22, 159-166. https://doi.org/10.1016/S0926-3373(99)00048-X
  2. Blauwens, J., Smets, B., Peeters, J. (1977) Mechanism of prompt no formation in hydrocarbon flames, Symposium (International) on Combustion, 16, 1055-1064.
  3. Buscaa, G., Liettib, L., Ramisa, G., Bertic, F. (1998) Chemical and mechanistic aspects of the selective catalytic reduction of $NO_x$ by ammonia over oxide catalysts: A review, Applied Catalysis B., 18, 1-36. https://doi.org/10.1016/S0926-3373(98)00040-X
  4. Djerad, S., Tifouti, L., Crocoll, M., Weisweiler, W. (2004) Effect of vanadia and tungsten loadings on the physical and chemical characteristics of $V_2O_5-WO_3/TiO_2$ catalysts, Journal of Molecular Catalysis A: Chemical, 208, 257-265. https://doi.org/10.1016/j.molcata.2003.07.016
  5. Forzatti, P. (2000) Environmental Catalysis for Stationary Applications, Catalysis Today, 62, 51-65. https://doi.org/10.1016/S0920-5861(00)00408-9
  6. Forzatti, P. (2001) Present status and perspectives in de-$NO_x$ SCR catalysis, Applied Catalysis A., 222, 221-236. https://doi.org/10.1016/S0926-860X(01)00832-8
  7. Heck, R.M. (1999) Catalytic Abatement of Nitrogen Oxides-Stationary Applications, Catalysis Today, 53, 519-523. https://doi.org/10.1016/S0920-5861(99)00139-X
  8. Kim, K.H. (2007) Denitrification Technology (SCR) Trend and Nano-catalyst, Korean Industrial Chemistry News, 10, 45-59.
  9. Kim, K.W. (2014a) A study on the selective oxidation study of Pt catalysts for ammonia removal, Department of Environmental energy systems engineering, Kyongki University.
  10. Kim, N.R. (2014b) Preparation and Thermal Properties of Mullite/Cordierite Nano-Composite, Department of Environmental engineering, Chungbuk University.
  11. Kobylinski, T.P., Taylor, B.W. (1974) The catalytic chemistry of nitric oxide: II. Reduction of nitric oxide over noble metal catalysts, Journal of Catalysis, 33, 376-384. https://doi.org/10.1016/0021-9517(74)90284-X
  12. Lee, M.S., Lee, J.B. (2010) Investigation of Elemental Mercury Oxidation on Commercial SCR Catalysts in Flue Gas of Fossil Fired Power Plant, Journal of Korean Society for Atmospheric Environment, 26(3), 245-252. https://doi.org/10.5572/KOSAE.2010.26.3.245
  13. Lee, H.Y. (2016) The Reaction Characteristics of $NO_x/N_2O$ and $NH_3$ in SCR Process with Load Variation, Department of Environmental engineering, University of Seoul.
  14. Liuqing, T., Daiqi, Y., Hong, L. (2003) Catalytic performance of a novel ceramic-supported vanadium oxide catalyst for NO reduction with $NH_3$, Catalysis Today, 78, 159-170. https://doi.org/10.1016/S0920-5861(02)00322-X
  15. Lu, W., Jia, Y., Lv, W., Zhao, Q., You, H. (2014) Color tunable emission and energy transfer in $Eu^{2+}$, $Tb^{3+}$, or $Mn^{2+}$-activated cordierite for near-UV white LEDs, Royal Society of Chemistry, 38, 2884-2889.
  16. Mari, M., Domingo, J.L. (2010) Toxic emissions from crematories: A review, Environment International, 36, 131-137. https://doi.org/10.1016/j.envint.2009.09.006
  17. Nova, I., Acqua, L.D., Lietti, L., Giamello, E., Forzatti, P. (2001) Study of thermal deactivation of a de-$NO_x$ commercial catalyst, Applied Catalysis B: Environmental, 35, 31-42. https://doi.org/10.1016/S0926-3373(01)00229-6
  18. Salazar, M., Hoffmann, S., Tillmann, L., Singer, V., Becker, R., Grunert, W. (2017) Hybrid catalysts for the selective catalytic reduction (SCR) of NO by $NH_3$: Precipitates and physical mixtures, Applied Catalysis B: Environmental., 218, 793-802. https://doi.org/10.1016/j.apcatb.2017.06.079
  19. Yates, M., Martin, J.A., Mariin-Luengo, M.A., Suarez, S., Blanco, J. (2005) $N_2O$ formation in the ammonia oxidation and in the SCR process with $V_2O_5-WO_3$ catalysts, Catalysis Today, 107-108, 120-125. https://doi.org/10.1016/j.cattod.2005.07.015