Shipboard Pollution Control U.S. Navy Compliance with MARPOL Annex V (1996) / Chapter Skim
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3 INCINERATION
3 INCINERATION
Pages 18-24
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From page 18... ...
Incineration is a flexible method of waste destruction for flammable waste materials, and it has been fairly widely used for this purpose on board commercial vessels, with several thousand units having been installed worldwide. The Navy has extensive experience with shipboard incinerators of an older generation, and the committee has anecdotal information that the experience was not entirely satisfactory.
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From page 19... ...
Aircraft carriers appear to have more than adequate capacity to burn all paper generated, as do a significant fraction of auxiliaries and amphibious ships (the numbers for the latter categories are ambiguous because the number of ships that will remain in commission after 1998 is uncertain)
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From page 20... ...
3Calculated, approximately, from vendor-supplied kW figures assuming trash fuel only at 8,000 BTU/lb. Because of the similarity of waste streams on board Navy, cruise line, and other vessels, vendors ot commercial incineration equipment may be able to adapt their technologies to Navy ships.
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From page 21... ...
Combustion Chambers The rule of thumb for good combustion is a residence time of 2 seconds at 1,800°F with oxygen contents of at least 2 percent. Although such temperatures can be sustained with the average heating value of the waste streams, the use of burners fired with auxiliary fuel in both the primary and secondary combustion chambers is advantageous to ensure burning of low heating value wastes.
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From page 22... ...
The ceramic construction enables operation at temperatures up to 1,800°F, although it would be preferable to operate at lower temperatures to reduce the pressure drop, but above 660°F to reduce dioxin formation. Mercury would remain volatile at these temperatures, and the reasonable course of action is to eliminate this element from the waste stream.
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From page 23... ...
With measurement results in hand, and with the Navy's controlled population and excellent record keeping practice on health matters, an exemplary program of personnel protection can be established. In certain circumstances, burning 3 or 4 tons per day of paper products and, possibly, plastics may affect air quality in coastal areas or in surrounding vessels.
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From page 24... ...
The Navy could install an automated feed system in the existing incinerators. The new feed system would feed solid wastes at the design rate of the incinerator and provide safe operation without overheating.
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