Journal of Korean Society of Environmental Engineers (대한환경공학회지)

Korean Society of Environmental Engineers (대한환경공학회)
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Characteristics of Acidic Gas Emissions from Combustion with Preblending of Coal and Sludge

석탄과 슬러지의 예혼합연소에 따른 산성가스 배출특성

  • Shim, Sung-Hoon (Environmental and Energy Research Division, Korea Institute of Machinery & Materials) ;
  • Jeong, Sang-Hyun (Environmental and Energy Research Division, Korea Institute of Machinery & Materials) ;
  • Min, Hyo-Ki (Department of Environmental Engineering, Chungbuk National University) ;
  • Lee, Sang-Sup (Department of Environmental Engineering, Chungbuk National University)
  • 심성훈 (한국기계연구원 환경에너지연구본부) ;
  • 정상현 (한국기계연구원 환경에너지연구본부) ;
  • 민효기 (충북대학교 환경공학과) ;
  • 이상섭 (충북대학교 환경공학과)
  • Received : 2013.02.06
  • Accepted : 2014.01.20
  • Published : 2014.02.28
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Abstract

Using dried sludge as a secondary fuel of a coal-fired power plant is proposed as an alternative option for sludge disposal. Because elemental contents of sludge are different from those of coal, different levels of acidic gas emissions are expected from the co-combustion of sludge with coal. In this study, sludge samples were obtained from 7 sewage treatment plants in Korea. Each sludge sample was combusted together with coal in a lab-scale combustor, and the concentrations of nitrogen oxides ($NO_x$), sulfur dioxide ($SO_2$), hydrogen chloride (HCl), chlorine ($Cl_2$) in the flue gas were analyzed. Compared to the combustion of coal only, $NO_x$ concentration was slightly higher in the flue gas from the co-combustion of coal and sludge. $SO_2$ emission increased with the combustion of sludge due to the higher content of sulfur in sludge than in coal. For most of the tested samples, the concentrations of HCl and $Cl_2$ were varied depending on the chlorine content in the sludge sample.

하수슬러지의 해양투기 규제에 따른 처리대안으로 석탄화력발전소 보조연료로서의 활용이 제안되고 있다. 슬러지를 석탄과 혼합하여 사용한다면 연료의 조성변화로 인하여 산성가스의 배출특성이 달라질 것으로 예상된다. 본 연구에서는 국내 하수처리장 7곳에서 발생한 하수슬러지를 수거하여 석탄과 혼합한 뒤 실험실 규모의 연소로에서 연소시킨 후 배출되는 질소산화물($NO_x$), 이산화황($SO_2$), 염화수소(HCl), 염소($Cl_2$) 가스를 분석하였다. $NO_x$는 슬러지 혼합에 따른 배출농도 변화가 가장 작았고, $SO_2$는 슬러지를 혼합하여 연소하였을 때 석탄 연소가스와 비교하여 높은 배출농도 증가를 보였다. HCl + $Cl_2$는 슬러지의 염소함량에 따라 서로 다른 배출농도를 보였다.

Keywords

References

  1. Statistics of sewage sludge in Korea 2010, Ministry of Environment(2010).
  2. Lee, D. G., Lee, J. S., Kwak, H. and Bae, S. Y., "Combustion characteristics of RDF (Refuse Derived Fuel)," J. Kor. Soc. Waste Manage., 22(1), 101-112(2005).
  3. Bae, S. R., Kim, Y. C., Kong, S. H., Lee, J. S., Seo, S. W. and Lee, K. C., "A study on recycling of sludge," Bullet. Environ. Sci., 18, 31-50(1997).
  4. Werther, J. and Ogada T., "Sewage sludge combustion," Prog. Energy Combust. Sci., 25(1), 55-116(1999). https://doi.org/10.1016/S0360-1285(98)00020-3
  5. Amand, L.-E. and Leckner B., "Metal emissions from cocombustion of sewage sludge and coal/wood in fluidized bed," Fuel, 83(13), 1803-1821(2004). https://doi.org/10.1016/j.fuel.2004.01.014
  6. Galbreath, K. C., Zygarlicke, C. J., Tibbetts, J. E., Schulz, R. L. and Dunham, G. E., "Effects of $NO_x,\;{\alpha}-Fe_2O_3,\;{\gamma}-Fe_2O_3$, and HCl on mercury transformations in a 7-kW coal combustion system," Fuel Proc. Technol., 86(4), 429-448(2004).
  7. Wang, Y., Duan, Y., Yang, L., Zhao, C., Shen, X., Zhang, M., Zhuo, Y. and Chen, C., "Experimental study on mercury transformation and removal in coal-fired boiler flue gases," Fuel Proc. Technol., 90(5), 643-651(2009). https://doi.org/10.1016/j.fuproc.2008.10.013
  8. Spliethoff, H. and Hein, K. R. G., "Effect of co-combustion of biomass on emissions in pulverized fuel furnaces," Fuel Proc. Technol., 54(1-3), 189-195(1998). https://doi.org/10.1016/S0378-3820(97)00069-6
  9. Lee, H. D. and Kim, J. K., "Combustion characteristics of two imported Indonesia coals as a pulverized fuel of thermal power plants," J. Energy Eng., 19(2), 136-142(2010).
  10. Lee, W. J., "NOx generation characteristics from sludge incinerators," J. Environ. Res. Inst. Yosu Univ., 3, 73-79(2000).
  11. Nadziakiewicz, J. and Koziol, M., "Co-combustion of sludge with coal," Appl. Energy, 75(3-4), 239-248(2003). https://doi.org/10.1016/S0306-2619(03)00037-0
  12. Park, S. T., "Control technology and behavior of mercury in coal combustion process,"(2009).
  13. Kang, S. W., Shim, S. H., Jeong, S. H., Jung, J. H. and Lee, S. S., "Mercury emission characteristics from co-combustion of coal and sludge," J. Kor. Soc. Atmos. Environ., 28(2), 182-189(2012). https://doi.org/10.5572/KOSAE.2012.28.2.182
  14. Sun, J. Q., Crocker, C. R. and Lillemoen, C. M., "The Effect of Coal Combustion Flue Gas Components on Low-Level Chlorine Speciation Using EPA Method 26A," J. Air Waste Manage. Assoc., 50(6), 936-940(2000). https://doi.org/10.1080/10473289.2000.10464142

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