Page 275 - Wastewater Solids Incineration Systems

Incinerator Operations 237

in the wind box. However, a stainless steel arch, with an abovebed preheat burner,
has been successfully used in St. Paul, Minnesota, and Lynn, Massachusetts.
In the cold wind box design, the wind box is uninsulated and the arch is fabri-
cated from steel and stainless steel. The startup preheat burner is located in the free-
board, as shown, or in the bed. Other components such as thermocouples, pressure
taps, fuel guns, feed nozzles, emergency water sprays, and sight glasses are the same
for both designs.

3.1 Fluid Bed Incinerator Startup
3.1.1 Cold Startup
During cold startup, the incinerator is heated from room temperature to operating
temperature before cake feeding and stabilizing operations begin. When an inciner-
ator is started for the first time, or when new refractory has been installed, the refrac-
tory must be cured or dried out. To do so, the operator should

• Raise the bed temperature at a rate of 10°C (50°F) per hour to 121°C (250°F).
• Hold the temperature at 121°C (250°F) for six hours.

• Raise the bed temperature at the same rate to 260°C (500°F).
• Hold the temperature at 260°C (500°F) for 12 hours.
• Raise the bed temperature at the same rate to 704°C (1300°F).
• Hold the temperature at 704°C (1300°F) for 12 hours.

• Raise the bed temperature at the same rate to 871°C (1600°F).
• Hold the temperature at 871°C (1600°F) until no steam is observed at the roof
vents.
Before starting the refractory curing the operator must remove the pipe caps
from the roof vents on the incinerator. These are replaced after the refractory is cured.
The fluidized bed incinerator does not need to be cooled.
Before the incinerator is started up, the operator must check utilities and equip-
ment and prepare the system. The operator should check that

• Electric power and emergency power, if provided, are available at the main
circuit breaker.
• Fuels such as natural gas or fuel oil are available.