Page 116 - Wastewater Solids Incineration Systems
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Combustion Technology 85
FIGURE 5.15 Typical rabble arm arrangement: 1 shaft cold air tube; 2 shaft
castable insulation; 3 rotating shaft; 4 arm holding pin; 5 rabble arm; 6
inner tube; 7 rabble tooth; 8 tooth-holding pin; 9 mineral wool insulation;
10 steel furnace shell; 11 drop hole; 12 hearth; 13 lute cap; 14 cold air;
and 15 heated air.
tooth-holding pin inserted to the end of the arm. Rabble arms are arranged at the
same angle as the hearth to provide a uniform space between the teeth and the
hearth. Rabble teeth are angled to move the cake solids in the desired direction.
Teeth can also be installed to provide movement in the opposite direction to
increase mixing and residence time on the hearth. This arrangement is referred to
as back rabbling.