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 3.9 MAINTENANCE AND OPERATION REQUIREMENTS. Large amounts of water and
bottom sediment are commonly found in waste oils. Excessive amounts of
water in oil can cause flameouts, and excessive solid concentrations can
cause accelerated wear and damage to boiler equipment. Removal of water
and solids from the waste oil prior to burning is essential. Gravity
separation is usually satisfactory. Accelerated separation may be achieved
by heating the oil, blending with other light oil, or using a centrifuge.
Generally, waste oils free of water and sludge can be satisfactorily fired
in boilers either straight or in blends with regular fuel oils. Problems
that may be encountered in burning waste oil are:
Fine lint buildup in barrels and nozzles which are hard to clean.
More frequent cleaning of fuel strainers, up to four times as
often. Use of a duplex strainer is highly recommended.
Carbon deposit buildup around the nozzle tip areas due to improper
burner adjustments or worn nozzle orifices (Figure 3-5).
FIGURE 3-5
Nozzle tip with carbon deposit buildup.
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