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| Case Study: HMS Illustrious |
Background
HMS Illustrious, the Royal Navy's capital through-deck cruiser, had various problems with onboard incineration of waste which had resulted in unsatisfactory flue emissions. The Ministry of Defence enlisted the assistance of WISenvironmental to investigate and propose remedies to the operational issues after a leading international consultancy for defence technology based services had failed to identify solutions to the problems. |
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Identifying the problems
Following an extensive on board investigation, WISenvironmental identified three problem areas:
Flue Emission
Unburned waste was occasionally being discharged through the exhaust ducting which were unsatisfactory for ship operations.
Molten Steel Leakage
There had been a build up of slag due to the addition and processing of tins/cans (mixed steel and aluminium) during the use of the advanced incineration system which was not initially experienced on the land based pilot plant.
MARPOL Compliance
The incineration units did not comply with the provisions of the MARPOL with respect to CO, soot emissions and O2 in the combustion chamber. |
| Delivering the solution |
Measure |
MARPOL Compliance solution |
Slagging solution |
Unburnt waste discharge |
Other Benefits/ Comment |
| Optimisation of feed screw |
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| Optimisation of combustion air injection and re-commissioning |
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| Install rotary valve |
(more regular feed) |
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Eliminates risk from aerosol can explosions |
Remove metal cans from waste
Not realised
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Impractical |
| Define precise performance envelope for MARPOL test |
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| Investigate draught problem in 4J |
(temperature setting) |
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Eliminates smoke emissions |
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