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In order to investigate the operation characteristics of the
1-t/hr prototype vortexing fluidized-bed combustor (VFBC), the
combustion test with 2 sizes of waste tire were conducted. The
sizes of scrap tires used in the study were 10-20mm and
50-100mm . The cross section of the combustion chamber is 0.7
by 1.4m and 2 m in height. The freeboard section is 1 m in
diameter, 4 m in height. There are two levels of secondary air
injection. each level has four equally-spaced air nozzles. The
special arrange- ment is non-equal air plenums of the windbox
and incline distri- butor causing the internally circulating
within the fluidized bed. The typical operating conditions were
as flollows: the feed rate of scrap tires was kept about 65 kg/
hr, static bed depth was approximately 0.35 m, superfical gas
velocity was 0.84 m/s and the average bed temperature was about
800℃. The typical start-up procedure takes 4-5 hrs. The effect
of the size of waste tire, secondaryu air flow rate and
tertiary air flow rate on the combustion efficiency, sulfur
retention and pollants emission were studied. According to the
experimental results, the emissions of SO2、NOx and CO in the
flue gas meet the ROC-EPA regulations.
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