Page 278 - Wastewater Solids Incineration Systems

240 Wastewater Solids Incineration Systems

• Stop the auxiliary fuel feed and blowers when the temperature has reached
871°C (1600°F).
• Blow out the fuel injection guns, if equipped
• Remove the fuel injection guns, if equipped, from the bed

• Check the block and bleed valves, if the fuel oil system is so equipped.
• Remove freeboard water spray nozzles.
If the incinerator is shutdown overnight, it can be restarted using the warm
startup procedure discussed in section 3.1.3. If the incinerator is on hot standby for a
longer period, and the bed temperature drops to 649°C (1200°F), the operator should
reheat the incinerator to 871°C (1600°F) using the warm startup procedure.

3.1.3 Warm Startup
Before a warm startup of a fluid bed incinerator, the operator should check utilities
and equipment and prepare the system using the procedures described in section
3.1.1, Cold Startup.
If the incinerator bed temperature is lower than 649°C (1200°F) preheat burners
must be used. If the incinerator bed temperature is higher than 649°C (1200°F), the
operator can immediately begin feeding cake and bed fuel into the incinerator. If the
bed temperature is lower than 649°C (1200°F), the operator should perform the warm
startup procedures as follows:

• Open the scrubbing system water valves.
• Start the purge air blowers.
• Start the preheat burners.
• Heat the bed at a rate no more than 38°C (100°F) per hour. Operate the flu-
idizing air blower for 30 seconds every 30 minutes to bump the sand bed.
• Begin injecting fuel oil to the bed, if applicable, when the bed temperature
reaches 621°C (1150°F); the fluidizing air blowers and induced draft fan, if
installed, must be operating before fuel oil can be injected to the bed.
• Start the feed cake when the bed temperature is higher than 649°C (1200°F);
air pollution regulations may require a higher temperature before the operator
injects the feed cake.
• Gradually increase the feed cake rate to the operating rate.