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http://dx.doi.org/10.7464/ksct.2018.24.4.323

Co-firing Characteristics and Slagging Behavior of Sewage Sludge with Coal and Wood Pellet in a Bubbling Fluidized Bed  

Ahn, Hyungjun (Korea Institute of Industrial Technology)
Kim, Donghee (Korea Institute of Industrial Technology)
Lee, Youngjae (Korea Institute of Industrial Technology)
Publication Information
Clean Technology / v.24, no.4, 2018 , pp. 323-331 More about this Journal
Abstract
The results of an experimental investigation on the co-firing characteristics and slagging behavior of dried and hydrothermal carbonization sewage sludge, sub-bituminous coal, and wood pellet in a fluidized bed were presented. Combustion tests were conducted in a lab-scale bubbling fluidized bed system at the uniform fuel-air equivalence ratio, air flow rate, and initial bed temperature to measure bed temperature distribution and combustion gas composition. 4 different fuel blending cases were prepared by mixing sewage sludge fuels with coal and wood pellet with the ratio of 50 : 50 by the heating value. $NO_x$ was mostly NO than $NO_2$ and measured in the range of 400 to 600 ppm in all cases. $SO_2$ was considered to be affected mostly by the sulfur content of the sewage sludge fuels. The cases of hydrothermal carbonization sewage sludge mixture showed slightly less $SO_2$ emission but higher fuel-N conversion than the dried sewage sludge mixing cases. The result of fly ash composition analysis implied that the sewage sludge fuels would increase the possibility of slagging/fouling considering the contents of alkali species, such as Na, K, P. Between the two different sewage sludge fuels, dried sewage sludge fuel was expected to have the more severe impact on slagging/fouling behavior than hydrothermal carbonization sewage sludge fuel.
Keywords
Sewage sludge; Hydrothermal carbonization; Co-firing; Slagging; Fluidized bed;
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Times Cited By KSCI : 1  (Citation Analysis)
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