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2020 Vol.25, Issue 1 Preview Page

Research Article

Combustion of the Pellets of Sewage Sludge and Woody Biomass Blend in a Circulating Fluidized Bed Combustor: Effect of Oxidant Conditions on the Reduction of Pollutant Emissions

순환유동층 연소로에서 하수슬러지/목질계 바이오매스 혼합펠릿의 연소: 오염물질 저감을 위한 산화제 변화 영향

Geon-Uk Baek12
,
Ji-Hong Moon1
,
Sung-Ho Jo1
,
Sung-Jin Park1
,
Jae-Young Kim1
,
Yu-Jin Choi1
,
Dal-Hee Bae1
,
Hoang Khoi Nguyen Hoang Khoi3
,
Kyubock Lee2*
,
Tae-Young Mun1*
백 건욱12
,
문 지홍1
,
조 성호1
,
박 성진1
,
김 재영1
,
최 유진1
,
배 달희1
,
Nguyen Hoang Khoi3
,
이 규복2*
,
문 태영1*
1Climate Change Division, Korea Institute of Energy Research
2Graduate School of Energy Science and Technology, Chungnam National University
3Chemical Engineering Department, Kunsan National University
1한국에너지기술연구원 기후변화본부
2충남대학교 에너지과학기술대학원
3군산대학교 화학공학과
* Corresponding Author
31 March 2020. pp. 37-47
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Abstract

Combustion experiment for pellets of sewage sludge and woody biomass blend was conducted in a pilot-scale circulating fluidized bed combustor (CFBC) consisting of the riser, two hot cyclones and a loop-seal to reduce pollutant emission in exhausted flue gas. To achieve them, the effect of the oxidant variations, such as superficial velocity, equivalence ratio(ER: 1.2, 1.3, 1.4) and combustion atmosphere (air-fired and oxy-fired) was evaluated. As pollutant emissions in flue gas, SO2, NO, CO, CO2, HCl, odor contaminants and leaching behavior of heavy metals were analyzed. As a result, to stably operate combustion of pellet mixed with sewage sludge and woody biomass as alternative renewable fuel in a CFBC system, the superficial velocity in the riser had to be kept under 6 m/s and the equivalence ratio was proper around 1.3-1.4. All odor contaminants formed at these operating conditions met the domestic air pollutant standards. Heavy metals in fly ash met the environment ministry’s standard. Additionally, compared to air-firing, SO2, NO and CO as precursors of fine particles during oxy-firing were reduced by 70.8, 77.1 and 38.2%, respectively.

Keywords
Sewage sludge
Circulating fluidized bed combustion
Oxidants
Equivalence ratio
Superficial velocity
Pollutants

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Information
  • Publisher :The Korean Society Combustion
  • Publisher(Ko) :한국연소학회
  • Journal Title :Journal of The Korean Society Combustion
  • Journal Title(Ko) :한국연소학회지
  • Volume : 25
  • No :1
  • Pages :37-47
  • Received Date : 2019-10-21
  • Revised Date : 2019-11-19
  • Accepted Date : 2019-12-11
  • DOI :https://doi.org/10.15231/jksc.2020.25.1.037
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