DOI QR코드

DOI QR Code

환원제로서 바이오디젤 혼합연료가 HC-SCR의 NOx 변환효율에 미치는 영향 연구

The Effect of Biodiesel Blend Fuels As Reductants on NOx Conversion Efficiency of HC_SCR

  • 송호영 (한국석유관리원 석유기술연구소) ;
  • 이민호 (한국석유관리원 석유기술연구소) ;
  • 김기호 (한국석유관리원 석유기술연구소)
  • Song, Hoyoung (korea Petroleum Quality & Distribution Authority) ;
  • Lee, Minho (korea Petroleum Quality & Distribution Authority) ;
  • Kim, Kiho (korea Petroleum Quality & Distribution Authority)
  • 투고 : 2015.09.21
  • 심사 : 2015.11.28
  • 발행 : 2015.12.31

초록

본 연구는 경유를 2차 분사연료로 사용하는 HC-SCR 후처리장치에서 2차 분사연료의 바이오디젤 함량 변화(BD0, BD10, BD25)에 다른 NOx 변환특성을 분석하였다. 시험조건은 HC-SCR 장치의 특성, 2차 분사연료의 distillation 등을 고려하여 장치 전단온도는 $290^{\circ}C$, $320^{\circ}C$, $350^{\circ}C$로 설정하였으며, 공간속도는 55,000(1/h)으로 고정하고 연료분사량을 조절하였다. Distillation 시험결과, T90은 약 $350^{\circ}C$로 동일한 수준이었으며 바이오디젤 함량이 증가할수록 $350^{\circ}C$보다 낮은 조건에서 증발량이 감소한다는 결과를 얻었다. 2차 분사연료에 혼합된 바이오디젤 함량이 증가할수록 NOx 저감효율은 감소하는 것을 확인하였으며 저온조건($290^{\circ}C$)보다 고온조건($320^{\circ}C$, $350^{\circ}C$)에서 NOx 저감율의 차이가 더 크게 발생했다. 이러한 결과는 바이오디젤의 열악한 증발특성(Distillation)과 높은 분자량인 것으로 추측된다.

This study was aimed at analyzing NOx conversion characteristics in the HC-SCR with biodiesel content changes of the secondary fuel injection (BD0, BD10, BD25). Test conditions for temperature were set to $290^{\circ}C$, $320^{\circ}C$ and $350^{\circ}C$ considering the upstream temperature of a HC-SCR, distillation of the secondary injected fuels and etc. The amount of fuel injection was adjusted with a fixed space velocity of 55,000(1/h). According to the test results of distillation, the T90 was the same level about $350^{\circ}C$ on all test fuels and the amount of evaporation was reduced at lower than $350^{\circ}C$ temperature condition with increasing biodiesel content. As biodiesel content which is mixed with the secondary injected fuel is increased, NOx reduction efficiency was determined to decrease. The difference of the Nox reduction ratio in a high temperature condition($320^{\circ}C$ and $350^{\circ}C$) than the low temperature($290^{\circ}C$) was more significant. These results are thought to be poor evaporation properties (distillation) and high molecular weight of the biodiesel.

키워드

참고문헌

  1. Dieselnet, Emission standards-european union, www.dieselnet.com, 2015
  2. SIMBARASHE WILSON TIMOTHY SITSHEBO, HC-SCR of NOx Emissions Over Ag-Al2O3 Catalysts Using Diesel Fuel As A Reductant, Doctor of Philosophy, The University of Birmingham, 2010
  3. C. H. Lee; K. C. Oh; D. J. Kim; C. B. Lee; H. S. Lee; T. M. Kim, Development of HC-SCR System Configuration for Improvement of NOx Reduction Rate on Heavy Duty Diesel Engine, KSAE Annual Conference Proceedings, 2008
  4. Viola, M., HC-SCR Catalyst Performance in Reducing NOx Emissions from a Diesel Engine Running Heavy Duty Transient Test Cycles with Diesel Fuel and Ethanol as The Reductants, SAE Technical Paper 2009-01-2775, 2009
  5. Zhiming Liu; Seong Ihl Woo, Recent Advances in Catalytic DeNOx Science and Technology, Catalysis Reviews, 2010, 48: 1, 43-89 https://doi.org/10.1080/01614940500439891
  6. Erol Seker; Erdogan Gulari, Activity and N2 Selectivity of Sol-Gel Prepared Pt/Alumina Catalysts for Selective Nox Reduction, Journal of Catalysis, 2000, 194, 4-13 https://doi.org/10.1006/jcat.2000.2949