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2019 Vol.24, Issue 2 Preview Page

Research Article

Experimental Study of Co-combustion Characteristics of Coal and Sewage Sludge Solid Fuel in Pilot-scale Bubbling Fluidized Bed

파일럿 규모의 기포 유동층 반응기를 이용한 석탄과 하수 슬러지 고형 연료의 혼소에 대한 실험적 연구

Donghee Kim12
,
Hyungjun Ahn2
,
Kang Y. Huh1
,
Youngjae Lee2*
김 동희12
,
안 형준2
,
허 강열1
,
이 영재2*
1Department of Mechanical Engineering, Pohang University of Science and Technology
2Thermochemical Energy System Group, Korea Institute of Industrial Technology
1포항공과대학교 기계공학과
2한국생산기술연구원 고온에너지시스템그룹
* Corresponding Author
30 June 2019. pp. 41-50
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Abstract

In this study, the co-combustion characteristics of coal and sewage sludge were investigated using 100 kWth bubbling fluidized bed (BFB) combustion system. Sub-bituminous coal (Coal), dried sewage sludge solid fuel (DSS), and hydrothermal carbonization sewage sludge solid fuel (HTCSS) were considered as fuel blends. The higher heating value of HTCSS was about 1,500 kcal/kg higher than that of DSS since the fuel ratio, H/C and O/C ratio were improved by the hydrothermal carbonization. The hardgrove grindability index (HGI) was performed to understand the feasibility of industrial applications. In the pilot-scale BFB experiment, the heat input, as 72 kWth, was fixed in all cases. The mixing ratios of HTCSS and DSS were 2, 5 and 10% respectively based on the higher heating value. Under the co-combustion conditions, the temperature in the reactor was increased in the freeboard zone due to the higher volatile matter of HTCSS and DSS than Coal. The trend of CO and NOx emissions was similar in all cases as mixing ratio was increased. However, SO2 emission was decreased in HTCSS co-combustion case due to the lower sulfur content compared to than that of DSS. Ash acquired after BFB combustion was analyzed by XRF to evaluate the slagging/fouling tendency. The variation of slagging/fouling tendency was minor in all cases.

Keywords
Bubbling fluidized bed
Sewage sludge
Hardgrove grindability index
Co-combustion
Emissions
Slagging/fouling
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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 : 24
  • No :2
  • Pages :41-50
  • Received Date : 2019-05-14
  • Revised Date : 2019-04-22
  • Accepted Date : 2019-05-27
  • DOI :https://doi.org/10.15231/jksc.2019.24.2.041
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