Journal of the Korean Recycled Construction Resources Institute (한국건설순환자원학회논문집)

Korean Recycled Construction Resources Institute (한국건설순환자원학회)
권호 표지
DOI QR코드

DOI QR Code

Case Study on NOx Emissions from Cement Kiln before and after Applying Multi-stage Combustion Technology

다단연소 기술 적용 전후 시멘트 소성설비의 NOx 배출 사례 연구

  • 최재원 (아세아시멘트 기술연구소) ;
  • 백주익 (아세아시멘트 기술연구소) ;
  • 김장중 (아세아시멘트 기술연구소) ;
  • 원필성 (아세아시멘트 기술연구소)
  • Received : 2023.09.11
  • Accepted : 2023.09.14
  • Published : 2023.09.30
Download PDF
⟨ Previous Next ⟩

Abstract

The cement industry has been contributing to solve the wastes problem by using various combustible wastes as alternative fuel to replace natural coal. To use more alternative fuels such as waste plastics, in the cement manufacturing process, it is necessary to stably burn alternative fuels and reduce air emissions such as NOx. This study is a case study on the multi-stage combustion calciner process, which is a technology that decreases the amount of NOx while increasing the use of alternative fuels. This study is a case study on the multi-stage combustion process, a technology that reduces the amount of harmful air emissions such as NOx while increasing the use of alternative fuels. Along results of comparing before and after applying the technology to actual cement manufacturing facilities, the amount of coal consumption decreased by 38 %, waste plastics consumption increased by 122 %, and NOx emissions decreased by 17 %. Results show that increasing the use of alternative fuels and reducing NOx emissions by multi-stage combustion is effective.

시멘트 산업은 다양한 가연성 폐기물을 천연자원인 유연탄을 대체하는 연료로 사용함으로써 폐기물 처리 문제 해결에 기여하고 있다. 시멘트 제조공정에서 더 많은 폐합성수지 등 대체연료를 사용하기 위해서는 대체연료를 안정적으로 연소시키고, 특히 NOx와 같은 유해물질의 대기배출을 저감할 필요가 있다. 본 연구는 폐합성수지 등 대체연료의 사용량을 증대시키면서 NOx와 같은 대기배출 유해물질의 발생량을 저감하는 기술의 하나인 다단연소 공정에 대한 사례연구다. 실제 시멘트 제조설비에의 기술 적용 전후 연료 사용량, NOx 배출 등을 비교하여 효과를 평가한 결과, 유연탄의 사용량은 38 % 감소, 폐합성수지 사용량은 122 % 증가하면서 동시에 NOx 배출량은 17 % 저감된 것으로 평가되어 다단연소에 의한 폐합성수지 사용 증대 및 NOx 배출 저감 효과가 유효함을 확인하였다.

Keywords

Acknowledgement

이 연구는 한국산업기술평가관리원의 2023년도 연구비 지원 (과제번호 : RS-2023-00261157)에 의해 수행되었습니다.

References

  1. Beychok, M.R. (1973). NOX emission from fuel combustion controlled, Oil & Gas Journal, 3, 53-56. 
  2. Choi, J.W., Baek, J.I., Kwon, S.J., Won, P.S., Kang, B.H. (2020). Study on the correlation between air emission gas and alternative fuels used in cement sintering process, Journal of the Korean Recycled Construction Resources Institute, 8(3), 286-293 [in Korean]. 
  3. FLSmidth (2003). Emission from Cement Kilns of SO2 and NOx, The International Cement Production Seminar 2003, Lecture: 05-12. 
  4. Gartner, E.M. (1983), Nitrogenous Emissions from Cement Kiln Feeds, in: Rule 1112 Ad Hoc Committee Meeting South Coast Air Quality Management District, El Monte, CA, June 7. 
  5. Hilovsky, R.J. (1977), NOX Reductions in the Portland Cement Industry With Conversion to Coal-Firing. 1977 U.S. EPA Emission Inventory/Factor Workshop. Raleigh, NC. 
  6. Kim, H.S., Jhung, J.K. (2023). A study on the analysis of changes in generation and characteristics of domestic waste according to COVID-19, Korean Public Health Research, 49(3), 43-48 [in Korean].  https://doi.org/10.22900/KPHR.2023.49.3.004
  7. Lefebvre, A.H. (2000), Gas Turbine Combustion, Taylor & Francis. 
  8. Shreve, R.N., Brink, J.A., (1977), Chemical Process Industries, New York, NY, Fourth Edition, McGraw Hill, Inc. 
  9. Walter, L., Greer, G.J.H., (2004). A Qualitative Examination of the Control of Major Gaseous Pollutants Generated in Portland Cement Kilns, Indiana, USA, Portland Cement Association, 33. 
  10. Yoon, J.Y., Yoon, Y.H., Yun, S.L., Lee, W.T. (2021). The current state of management and disposal of wastes related to COVID-19 : a review, Journal of Korea Society of Environmental Engineers, 43(12), 739-746 [in Korean].  https://doi.org/10.4491/KSEE.2021.43.12.739
  11. Zel'dovich, Y.B. (1946). The Oxidation of Nitrogen in Combustion Explosions, Acta Physicochimica U.S.S.R., 21, 577-628.