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مهندسی کشتی - Exhaust Gas Cleaning systems
پنجشنبه 24 تیر 1389

Exhaust Gas Cleaning systems

   نوشته شده توسط: علی بنوتی    

لازم به ذکر است این سوال سر مهندسی تیر ماه بوده

As an alternative to using marine fuel oil with a 1.5% sulphur content
in SECA’s, an
exhaust gas cleaning system or other equivalent system may be used (abatement
technologies). The emission criteria for such systems are 6 g SOx/kWh

Development of a type approval standard for such systems is ongoing in IMO. The
current available abatement technology is based on seawater scrubbing principles.
There is however a few concerns related to these types of scrubber type systems:
- Annex VI states that port states may prohibit discharge of scrubber effluent
overboard in ports within SECA’s unless it can be documented that the effluent
complies with criteria set by that port state. A mitigating measure is installation
of filtration/treatment systems.
- It has been indicated that conventional scrubber technology may be struggling
to meet the emission criteria at high exhaust gas discharge flows.
- It has been indicated that there is a risk of blue-sheen originating from the
scrubber overboard discharge. Although, not necessarily constituting an
environmental hazard, the mere risk of such occurrences is to some operators
unacceptable.
- There are space considerations in the engine room and more specifically the
funnel. Although it has been indicated that the more advanced scrubber types
can replace standard silencers, the associated piping systems may represent
a challenge. Pressure drop in scrubbers has also been indicated as a
limitation, particular in way of main engines uptakes.
- Tanker owners have had mixed experiences with corrosion of inert gas
scrubbers and associated piping systems.
- The EU has been reluctant to accept scrubbers. However, in the latest
proposed amendments to the EU directive, they have opened for “trials of ship
emission abatement technologies”. Based on such trials they have indicated
that they may accept abatement technology as an equivalent to low sulphur
fuel. Note that EU has indicated that it will develop criteria for resulting waste
streams in their ports.
Regrettably, the number of development projects related to new scrubber technology
appears to be limited. However, some projects currently in the prototype phase show
promising results in terms of overcoming the above indicated constraints. It should
also be taken into account that exhaust gas cleaning alternatives will reduce the
emission of particulate matter (PM). Particulate matter is considered to be the next
focal point of IMO and this increases the future relevance of exhaust gas cleaning
systems.
Despite the indicated installation costs of 1-2 mill USD, future legislation, and
elimination of the problems associated with low sulphur fuel bunker management and
operation, may lead to exhaust gas cleaning systems becoming a cost-beneficial
alternative worthwhile exploring.
.


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