Lee Y  Kim J  Kim D  Lee Y

Vol. 23,  No. 1, pp. 80-89, Mar.  2017
10.7464/ksct.2017.23.1.080

Bubbling fluidized bed Sewage sludge Wood pellet Co-firing

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The bubbling fluidized bed (BFB) reactor with a diameter of 0.1 m and a height of 1.2 m was used for experimental study of co-firing and emission characteristics fueled by sewage sludge (SS) and wood pellet (WP). The facility consists of a fluidized bed reactor, feeding system, cyclone, condenser and gas analyzer, The mean particle diameter and minimum fluidization velocity are 460 μm and 0.21 m s-1 respectively. SS produced from Korea and WP from Canada were examined. The various mixing ratios of WP were 20, 50, and 80% based on HHV. The equivalence ratio of 1.65, reactor temperature of 800 °C, air flow rate of 100 L min-1, and fluidization number of 4 were fixed in the BFB experiment. In TGA, the range of combustion temperature of SS was wider than that of WP. It represents that the combustibility of WP is higher than that of SS. The BFB reactor temperature was maintained between 800 and 900 °C. CO emission of SS was high because of lower combustibility. NOX and SOX formation of SS were higher than that of WP since high nitrogen and sulfur contents of SS. CO, NOX, and SOX formation were suppressed as the mixing ratio of WP was increased. The slagging and fouling tendencies show high in all test conditions.