Journal of Energy Engineering (에너지공학)

The Korean Society for Energy (한국에너지학회)
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A Study on Combustion Characteristics in terms of the Type of Fuel Supply Device (Feeder) of a Wood Pellet Boiler

목재펠릿보일러의 연료공급 장치의 형태에 따른 연소특성에 관한 연구

  • Choi, Yun Sung (Forest Practice Research Center, Korea Forest Research Institute) ;
  • Euh, Seung Hee (Forest Practice Research Center, Korea Forest Research Institute) ;
  • Oh, Kwang Cheol (Department of Biosystems Engineering, Kangwon National University) ;
  • Kim, Dae Hyun (Department of Biosystems Engineering, Kangwon National University) ;
  • Oh, Jae Heun (Forest Practice Research Center, Korea Forest Research Institute)
  • 최윤성 (국립산림과학원 산림생산기술연구소) ;
  • 어승희 (국립산림과학원 산림생산기술연구소) ;
  • 오광철 (강원대학교 바이오시스템공학과) ;
  • 김대현 (강원대학교 바이오시스템공학과) ;
  • 오재헌 (국립산림과학원 산림생산기술연구소)
  • Received : 2015.02.02
  • Accepted : 2015.05.18
  • Published : 2015.06.30
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Abstract

This study reports the combustion characteristics, such as burner temperature and the concentration of exhausted gas ($O_2$, $CO_x$, $NO_x$) due to the different types and pitches of the fuel supply feeder of the wood pellet boiler. The 1st grade wood pellets composed of mainly larch have been used for the experiment. In case of using the spring feeder, mean temperature of burner was approximately $821.76^{\circ}C$, and the mean concentration of oxygen, carbon monoxide, carbon dioxide and nitrogen oxide were approximately 8.88%, 93.35ppm, 12.15% and 139.83 ppm, respectively. The test result with the spring feeder was shown to approach the condition of complete combustion compared to that of a screw feeder and were in good agreement with authentication judgement standard. Furthermore, the combustion efficiency was improved according to the growth of screw pitch. The control of air flow rate from the blower and ventilator is needed to achieve the complete combustion.

본 연구에서는 목재펠릿보일러의 연료공급 장치에 따른 연소특성의 분석을 위해, 낙엽송을 주요 구성성분으로 하는 1급 목재펠릿 연료 및 연소시스템인 목재펠릿보일러를 이용하여, 연료공급 장치(feeder)의 유형 및 형태에 따른 버너의 온도 및 배기가스($O_2$, $CO_x$, $NO_x$)의 농도 등이 측정, 비교, 분석되었다. 스프링 연료공급 장치가 실험 조건으로 적용된 경우의 버너의 평균 온도는 약 $821.76^{\circ}C$, 배기가스 산소 농도는 약 8.88%, 일산화탄소 농도는 약 93.35ppm, 이산화탄소 농도는 약 12.15%, 질소산화물의 농도는 약 139.83 ppm으로 측정되었으며, 이는 스크류 형태의 연료공급 장치가 설치된 실험조건에 비해 완전연소 조건에 도달하였으며, 배기가스의 평균농도가 허용 기준을 만족하는 것으로 나타났다. 또한, 스크류 피치의 증가에 따른 연소효율이 증가하는 것으로 나타났다. 목재 펠릿의 완전연소를 위한 조건에 근접, 조성하기 위해서는 연료의 투입량 조절과 더불어 투입되는 공기의 양을 제어하는 연구가 요구된다.

Keywords

References

  1. Korea Forest Service, "Dominate Travail Plan," 2015.
  2. Korea Energy Management Corporation, "Detailed Standard on System Evaluation of New & Renewable Energy," 2011.
  3. Lee, Y. W., Ye, I. S., Li, M. R., Hong, J. H., Oh, J. G., Lee, U. J., Ryu, C. K., "Improving the Combustion Efficiency of a Wood Pellet Stove," KOSCO SYMPOSIUM, 2010, pp. 249-253.
  4. Ahn, J., Kim, J. J., Park, B. S., "Combustion and Heat Transfer Characteristics inside the Combustion Chamber of a Wood Pellet Boiler," The Society of Air-Conditioning and Refrigerating Engineers of Korea, Winter Conference, 2011, pp. 363-366.
  5. Sim, B. S., Kim, H. J., Park, H. C., Kim, J. J., Choi, K. S., Kang, S. B., "Combustion Characteristics of a Wood Pellet," The Korean Society of Mechanical Engineers, Spring Conference, 2012, pp. 276-278.
  6. Oh, J. H., Choi, Y. S., Kim, D. H., "Analysis Combustion Property for Logging Residues of Wood Pellet Boiler," Korean Forest Society, Conference, 2013, pp. 889-892.
  7. Jang, J. H., Kim, J. J., Choi, K. S., Kang, S. B., Sim, B. S., Ahn, J., "The Load Combustion & Heat Transfer Characteristics inside the Combustion Chamber of Moving Grate Type of a Wood Pellet Boiler," Korean Journal of Air-Conditioning and Refrigeration Engineering, Summer Conference, 2014, pp. 932-935.
  8. Ahn, J., Jang, J. H., "CFD (Computational Fluid Dynamics) Study on Partial-Load Combustion Characteristics of a 4-Step-Grate Wood Pellet Boiler," The Korean Society of Mechanical Engineers, 2014, Vol. 38, No. 4, pp. 365-371. https://doi.org/10.3795/KSME-B.2014.38.4.365
  9. Sim, B. S., Kim, J. J., Choi, K. S., Kang, S. B., Jang, J. H., "Experimental Study on the Combustion Characteristics of Moving Grate Wood Pellet Combustor," Korean Journal of Air-Conditioning and Refrigeration Engineering, Summer Conference, 2014, pp. 869-872.
  10. Sim, B. S., Kim, J. J., Choi, K. S., Kang, S. B., Mun, J. S., Oh, H. Y., "Performance Characteristics of Wood Pellet Combustion Facilities 200,000 kcal/h-class," The Korean Society of Mechanical Engineers, Spring Conference, 2012, pp. 276-278.
  11. Lee, S. H., Jin, I. S., Lee, H. J., Park, Y. S., "The Control System of Wood Pellet Boiler," Proceedings of KIIS, Spring Conference, 2014, Vol. 24, No. 1, pp. 61-62.
  12. Kang, S. K., Choi, K. S., Yoon, J. Y., "Numerical Simulation on the Flow and Heat Transfer in the Combustion Chamber of Domestic Gas Boiler with 2-stage Heat Exchanger," Korean Society for Fluid Machinery, Winter Conference, 2008, pp. 607-613.
  13. Fiedler, F. and Persson, T., "Carbon Monoxide Emissions of Combined Pellet and Solar Heating Systems," Applied Energy, 2009, Vol. 86, pp. 135-143. https://doi.org/10.1016/j.apenergy.2008.05.008
  14. Persson Tomas, Fiedler Frank, Nordlander Svante, Bales Chris, Paavilainen Jane, "Validation of a dynamic model for wood pellet boilers and stoves," Applied Energy, 2009, Vol. 86, No. 5, pp. 645-656. https://doi.org/10.1016/j.apenergy.2008.07.004
  15. Kang, S. B., Kim, J. J., Choi, K. S., "Performance Test and Flue Gas Characteristics of Domestic Wood Pellet Boiler," Korean Journal of Air-Conditioning and Refrigeration Engineering, Winter Conference, 2009, pp. 569-573.
  16. Kang, S. B., Kim, H. J., Kim, J. J., Park, H. C., Choi, K. S., "Performance Characteristics of Domestic Wood Pellet Boilers," The Society of Air-Conditioning and Refrigerating Engineers of Korea, Summer Conference, 2011, pp. 900-903.
  17. Sim, B. S., Kim, J. J., Choi, K. S., Kang, S. B., Mun, J. S., Oh, H. Y., "Performance Characteristics of Wood Pellet Combustion Facilities 200,000 kcal/h-class," The Korean Society of Mechanical Engineers, Spring Conference, 2012, pp. 276-278.
  18. Jang, J. H., Ahn, J., Kim, J. J., "Combustion & Heat Transfer Characteristics Inside a Combustion Chamber of 13-Step-Grate Wood Pellet Boiler," Korean Society for Computational Fluids Engineering, 2013, pp. 73-77.
  19. Sim, B. S., Kim, J. J., Choi, K. S., Kang, S. B., "A Study on the Performance of Wood Pellet Boiler by the Method of Driving," The Korean Society of Mechanical Engineers, Spring & Autumn Conference, 2013, pp. 3416-3419.
  20. El-Rub, Z. Abu, Bramer, E. A., Brem, G., "Review of Catalysts for Tar Elimination in Biomass Gasification Process," Laboratory of Thermal Engineering, 2004, Vol. 43, No. 22, pp. 6911-6919.
  21. Yoon, S. J., Son, Y. I., Kim, Y. K., Lee, J. G., "Removal of Tar and Soot in the Syngas Produced from Gasification of Wood Chip by using Catalytic Reformer," The Korean Hydrogen and New Energy Society, 2009, Vol. 20, No. 6, pp. 519-525.
  22. Moon, J. H., Lee, U. D., Ryu, C. K., Lee, Y. M., Bae, W. K., "Characteristics of Tar Generation during the interval of Gasification of Woodchip," The Korean Society of Combustion, 2011, Vol. 16, No. 1, pp. 8-14.
  23. Eum, P. R. B., Lee, Y. W., Ryu, C. K., Park, Y. K., "Experimental Study on Thermal Cracking of Tar and Effect of Char in Biomass Gasification," The 43th KOSCO SYMPOSIUM, 2011, pp. 211-214.
  24. Park, H. Y., Kim, Y. J., Kim, T. H., Baek, S. H., Kim, K. S., Kwon, D. J., "Characteristics of Unburned Material Derived from Coal-fired Power Plant Burning Low Grade Coal," Journal of Energy Engineering, 2012, Vol. 21, No. 1, pp. 68-74. https://doi.org/10.5855/ENERGY.2012.21.1.068
  25. Euh, S. H., Oh, J. H., Ju, Y. M., Huh, J. N., Kim, D. H., "A Thermal Flow Analysis of Tar Scaled Heating Surface in a Pellet Boiler Using CFD," Korean Society for Agricultural Machinery, Spring Conference, 2013, pp. 95-96.
  26. Byun, Y. C., Kim, E. K., Park, S. H., Hwang, J. H., Lee, J. M., Kim, J. S., "Study of Nozzle Characteristics on Clinker Formation in a CFBC Boiler with CFD Calculation," The Korea Society for Energy Engineering, 2002, Vol. 11, No. 3, pp. 224-229.
  27. Seong, J. H., Choi, S. H., Kim, B. S., "Cinker Formation Characterizes in Opposed Coal Firing Boiler," The Korean Society of Mechanical Engineers, Spring Conference, 2011, pp. 52-54.
  28. Kang, S. B., Kim, J. J., Choi, K. S., Park, J. W., Sim, B. S., Oh, H. Y., "A Study on Production of Clinker, Byproduct of Combustion in a Domestic Wood Pellet Boiler Burner," The Korea Society for Energy Engineering, Spring Conference, 2012, pp. 78.
  29. Roberto Coll, Joan Salvado, Xavier Farriol, Daniel Montane, "Steam Reforming Model Compounds of Biomass Gasification: Conversion at Different Operating Conditions and Tendency towards Coke Formation," Fuel Processing Technology, 2001, Vol. 74, pp. 19-31. https://doi.org/10.1016/S0378-3820(01)00214-4
  30. Lim, Y. S., Kim, Y. I., Chung, K. S., "A Study of Domestic Wood Pellet Boilers Flue Gas Characteristics according to Induced Fan Air Flow Rate," Korean Journal of Air-Conditioning and Refrigeration Engineering, Summer Conference, 2012, pp. 593-596.
  31. Sim, B. S., Kim, J. J., Choi, K. S., Kang, S. B., Jang, J. H., "NOx Reduction Characteristics by the FGR of a Wood Pellet Boiler," Korean Journal of Air-Conditioning and Refrigeration Engineering, Winter Conference, 2014, pp. 344-347.
  32. Oh, J. H., Hwang, J. S., Kim, D. H., "Identification Optimal Combustion of Wood Pellet Boiler for $O_2$ and CO Concentration," Korean Forest Society, Conference, 2013, pp. 885-888.
  33. Jeong, Y. G., Kang, D. W., "Reducing to Unburned Carbon in T-Fired Boiler," KOSCO SYMPOSIUM, 2006, p. 275.
  34. Joel Chaney, Hao Liu, Jinxing Li, "An Overview of CFD Modelling of Small-scale Fixed-bed Biomass Pellet Boilers with Preliminary Results from a Simplified Approach," Energy Conversion and Management, 2012, Vol. 63, pp. 149-156. https://doi.org/10.1016/j.enconman.2012.01.036
  35. Oh, J. H., Kim, D. H., "Development Control Logic of Wood Pellet Boiler for Fuzzy Control," Korean Forest Society, Conference, 2013, pp. 840-843.
  36. Yang, J. S., Yoon, S. Y., "Economical and Environmental Feasibility of Cultivation under Structure Due to the Introduction of Bio-energy -Comparative Analysis of Wood Pellets and Diesel-," Korean J Organic AGRI, 2013, Vol. 21, No. 3, pp. 335-350. https://doi.org/10.11625/KJOA.2013.21.3.335
  37. Oh, J. H., Choi, Y. S., Lee, J. A., Kim, D. H., "A Study on Combustion Characteristic Devices Fuel Supply of Wood Pellet Boiler," Korean Forest Society, The Conference, 2013, pp. 260-263.