Page 254 - Wastewater Solids Incineration Systems

216 Wastewater Solids Incineration Systems

A thorough internal inspection can only be completed when the incinerator is out
of service and at ambient temperature to allow inspection from inside the incinerator.
The inspection area is typically a confined space entry, and all applicable confined
space entry procedures must be followed. However, some of the equipment can be
inspected by observation from outside the incinerator when the incinerator is in the
hot standby mode. This type of inspection is described later in this section.
The internal inspection of the MHF includes, but is not limited to, inspecting the
following components:

• Refractory, including hearths, ceiling, sidewalls, and center shaft.
• Lute caps.
• Ash outlet.

• Out-hearth drop holes.
• Emergency bypass stacks and dampers.
• Exhaust gas ductwork.

• Rabble arms and rabble arm teeth (cracked or warped arms and teeth should
be replaced).

• Burners
Burner ports and tiles should be inspected for cracks or slag buildup,
Target the burner flame to ensure that it is centered in the burner port, and
Verify that the burner flame does not impinge on the rabble arms or the ther-
mocouples.

• Thermocouples.
• Air pollution control system internal components such as the scrubber trays,
Venturi throat, spray nozzles, drains, and other components.

2.1.2 External Inspection
The external inspection of the MHF system includes, but is not limited to, the fol-
lowing components:
• Air dampers, blowers, cooling air system, and induced draft fans.
• Upper and lower sand seals.

• Conveyance and feed system.