Page 293 - Wastewater Solids Incineration Systems

254 Wastewater Solids Incineration Systems

1.8.10 Maintenance of 2.3.3 Tuyere Inspection,
Outside Ancillary Cleaning, and
Equipment 269 Replacement 271
1.8.11 Recordkeeping 269 2.3.4 Arch Repair and
Replacement 272
2.0 FLUID BED
2.3.5 Removal of Sand
INCINERATORS 271
Bed and Sand in
2.1 Slag Formation 271 the Wind box 272
2.2 Slag Removal 271 2.4 External Shell

2.3 Maintenance Issues 271 Maintenance 272
2.5 Shutdown
2.3.1 Thermocouple Repair
Maintenance 272
and Replacement 271
2.6 Refractory Repair 272
2.3.2 Calibration, Repair,
2.7 Recordkeeping 272
and Replacement
of Analyzers 271 3.0 SUGGESTED READING 274

Proper maintenance of incinerators and their ancillary equipment is an essential way to
reduce operating costs and downtime, extend equipment life, protect employees, and
ensure compliance with all applicable rules and regulations. This chapter addresses
maintenance issues that incinerator operators and managers need to monitor.

1.0 MULTIPLE-HEARTH FURNACES

1.1 Slag Formation
One of the significant maintenance issues for incinerator operators is formation of
slag. Slag is the fusion of inorganic (noncombustible) material within the feed mate-
rial being burned. It is primarily the result of excessive operating temperatures, flame
impingement, and hot spots within the incinerator.

1.1.1 Excessive Operating Temperatures
The actual “excessive operating temperature” at which slag will form is site specific
because the inorganic fusion temperature depends on the chemistry and composition
of the feed cake being burned.