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Dust Removal Efficiency and Operation Characteristics of Metal Filters for Coal Gasification Fines and Standard Dust Sample

금속필터를 사용한 석탄가스화 분진 및 표준 분진의 집진 효율과 운전특성

  • Yun, Yongseung (Plant Engineering Division, Institute for Advanced Engineering) ;
  • Chung, Seok Woo (Plant Engineering Division, Institute for Advanced Engineering) ;
  • Lee, Seung Jong (Plant Engineering Division, Institute for Advanced Engineering)
  • 윤용승 (고등기술연구원 플랜트엔지니어링 본부) ;
  • 정석우 (고등기술연구원 플랜트엔지니어링 본부) ;
  • 이승종 (고등기술연구원 플랜트엔지니어링 본부)
  • Received : 2019.03.19
  • Accepted : 2019.04.10
  • Published : 2019.08.01

Abstract

Demand for improving dust removal efficiency in coal power plants and the dust removal requirement to the level of capturing fine particulate matter and ultrafine particles have been increasing. While bag filter and electrostatic precipitator (ESP) are typically used for dust removal in the processes operating at atmospheric pressure, metal filters or ceramic filters are employed for dust which is produced at high temperature/pressure system as in coal gasification. For dust removal at the high temperature/pressure conditions, two metal filters of five compressed/sintered layers were manufactured and applied to analyze the dust removal characteristics. Manufactured metal filters exhibited more than 99% dust removal efficiency on coal gasification fine particulates in mass basis. To evaluate the fine particulate removal efficiency of less than $2.5{\mu}m$, JIS standard fine sample was used and confirmed the removal efficiencies of 97% and 70~82% on the fine particulates of $1{\sim}2.5{\mu}m$ size range. For the size range of less than $1{\mu}m$, dust removal efficiency of manufactured metal filters significantly degraded with smaller particle size. Improving methods are proposed to overcome the limitations in applying to fine dust of less than $1{\mu}m$.

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Fig. 1. Dust removal test facility using fine particulate matter obtained from coal gasifier.

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Fig. 2. Dust removal test facility using JIS standard fine particulate matter.

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Fig. 3. Dust concentration measuring equipment.

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Fig. 4. Particle diameter distribution diagram of fly-ash fines obtained from coal gasifier.

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Fig. 5. Particle diameter distribution of JIS standard fine particulate matter sample.

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Fig. 6. Cross-sectional diagram of metal filter manufactured through compression/sintering with 5 layers of stainless steel sheets.

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Fig. 7. Installation of metal filters to the dust removal test facility.

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Fig. 9. Operational characteristics of differential pressure by filter-cleaning methods (metal filter No. 1).

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Fig. 10. Operational characteristics of differential pressure by filter-cleaning methods (metal filter No. 2).

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Fig. 11. Removal efficiency of fine particulate matter using metal filter No. 1 for JIS standard fines.

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Fig. 12. Removal efficiency of fine particulate matter using metal filter No. 2 for JIS standard fines.

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Fig. 8. Particle size distribution of coal feed and captured fines in 3 ton/day coal gasification test using metal filter No. 1.

Table 1. Bulk density of fly-ash fines obtained from coal gasifier

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Table 2. Specification of metal filter

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Table 3. Dust concentration results using metal filter No. 1 for coal gasification flyash fines

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Table 4. Dust concentration results using metal filter No. 2 for coal gasification flyash fines

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Table 5. Environmental emission regulations of dust in Korea

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References

  1. Helble, J. J. and Sarofim, A. F., "Factors Determining the Primary Particle Size of Flame Generated Inorganic Aerosols," J. Colloid Interface Sci., 128, 348-362(1989). https://doi.org/10.1016/0021-9797(89)90349-4
  2. Li, Y., Suriyawong, A., Daukoru, M., Zhuang, Y. and Biswas, P., "Measurement and Capture of Fine and Ultrafine Particles from a Pilot-Scale Pulverized Coal Combustor with an Electrostatic Precipitator," J. of the Air & Management Association, 59, 553-559(2009).
  3. https://ams.confex.com/ams/pdfpapers/91068.pdf.
  4. Jones, A. M. and Harrison, R. M., "Emission of Ultrafine Particles from the Incineration of Municipal Solid Waste: A Review," Atmospheric Environment, 140, 519-528(2016). https://doi.org/10.1016/j.atmosenv.2016.06.005
  5. Zevenhoven, R. and Kilpinen, P., Control of Pollutants in Flue Gases and Fuel Gases, 3rd ed.., Chapter 5. Particles, Espoo/Turku, Finland(2004).
  6. Yun, Y. and Yoo, Y. D., "Performance of a Pilot-Scale Gasifier for Indonesian Baiduri Coal," Korean J. Chem. Eng., 18(5), 679-685(2001). https://doi.org/10.1007/BF02706386
  7. Maximum Two Times Tightening in Max Allowable Limit of Fine Particulate for Big Emitting Facilities, Press Release by Korea Ministry of Environment (2018).
  8. Jing, H., "Novel Applications of Electrostatic Precipitators in Coal - Biomass Combustion Systems," Ph.D. thesis, Washington University(2015).
  9. "High Sensitivity Device for Trapping Aerosolized Nanoparticles and Purifying Air," Scaffold Public Documents-Ref.: Scaffold SPD26(2014).