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.
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