Advantages open-loop wet scrubber
unlimited availability of seawater
system does not require additional storage space sincee the wash water is discharged directly
no hazardous chemical required
the cheapest and simplest system in regard to installation and operating cost
electric propulsion, best for….
ships with different operating profiles
passenger ships
ferries
offshore vessels
Advantages closed-loop wet scrubber
large flexibility
reduced FW flow required
Effluent may be stored on board for whatever duration the tank volumed will permit
disadvantages open-loop wet scrubber
wash water is a polluted water, discharge is prohibited in some areas
operation in brackish or fresh water or in high water temperatures can inhibit scrubbing of SOx
advantages SCR
lower investment cost
less complex system
no impact on steam production
does not impact piston running and combustion behaviour
disadvantages EGR
higher investment costs (20-40%)
complexity is higher
steam production is reduced by about 40%
may have an impact on piston running behaviour
EEXI
Energy Afficiency Existing Ships
for all ships of 400GT and above
Disadvantages closed-loop wet scrubber
higher initial cost
system requires a constant supply of sodium hydroxide solution, a hazardous substance requiring special handling, care and additional running costs
large-size buffer tank required for the zero-discharge areas
three most promising wet technologies
DWI
WIF
HAM
main components of a diesel power plant
auxiliary engines
electric generators
power cables
propulsion electric motors
CII
Carbon Intensity Indicator
for all ships of 5000GT and above
MARPOL Annex VI Regulations refer to
hybrid propulsion, best for…
ships with different operation modes and sailing speed
frigates
destroyers
…
Diesel mechanic, best for ships…
sailing at a single cruise speed, leads to a high fuel efficiency
carggo ships
fast crew suppliers
advantages electric propulsion over the mechanical propulsion
reduced nox emissions
flexibility in positioning machinery spaces
reduced maintenance load
disadvantages electric propulsion over mechanical propulsion
incurs increased electrical losses
when running redundant engines to achieve high propulsion, leads to poor fuel conspumption and a lot of emissions
access maintenance dooors
for access to the crankshaft and sump to inspect the general condition and also to take deflections to judge the bearing wear
explosion relieve doors
relieve pressure in the event of a crankcase explosion, OMD Oil mist detector in each cylinder
Middle plates
fuel pumps, mechanical lubricators, electronic cabinets, rail units
top plates
Which is the exhaust gas ratio of recirculation in an EGR system?
Enumerate three possible methods to reduce the SOx content in the gas emissions
Low SOx Content fuel Oil?
Scrubber System
Convent Ship to LNG
Exhaust Gas Recirculation (EGR) technique is a method related to
The primary pollutant most closely linked to the acid rain is
Consider an EGR system. Which of the following statements are false?
Which of the followings methods are considwred possible candidates to reduce the NOx emission?
Selective Catalytic Reduction (SCR) technique is a method related to
A SCR system is installed on a new ship. Identify which one from the following statements is true
Natural Gas (NG) that is used by consumers os composed almost entirely of:
Identify which statement about the LNG properties is TrueLNG i
In 2018, IMO adopted an initial strategy to reduce greenhouse gas emissions (GHG) produced by ships, compared to 2008 baseline, by:
The release of substances from ships into the atmosphere or sea is called:
How often must shipowners report their ship's CII (Carbon Intensity Indicator)?
Starting with 01.01.2020, the sulphur content in the fuel shall be not more than 0,5% (globally). This fuel is known as:
. What does slow steaming play in CO2 reduction on board ships?
What is the title of Regulation 14 of Marpol Annex VI?
Which of the following is a potential benefit of using emulsified fuel (WIF) to reduce NOx emissions?
Which is the exhaust gas ratio of recirculation in an EGR system:
Exhaust Gas Recirculation (EGR) technique is a method related to:
In Selective Catalytic Reduction (SCR), which substance is commonly used as a reductant to convert NOx into harmless gases?
What is a key environmental benefit of reducing NOx emissions from diesel engines?
The primary pollutant most closely linked to the acid rain is:
Consider an Exhaust Gas Recirculation (EGR) system. Which of the following statements are false?
Which of the followings methods are considered possible candidates to reduce the NOx content:
Selective Catalytic Reduction (SCR) technique is a method related to:
A SCR (Selective Catalytic Reduction) system is installed on a new ship. Identify which one from the following statements is true:
In comparison to EGR, what is an environmental advantage of using SCR technology for NOx reduction?
What does NOx stand for in the context of emissions from diesel engines?
Natural gas (NG) that is used by consumers is composed almost entirely of:
Identify which statement(s) about the LNG properties is TRUE:
Identify which statement(s) about LNG storage tank is FALSE:
What is a common type of LNG tank used on ships with dual-fuel engines?
How is boil-off gas (BOG) from LNG tanks typically managed in a dual-fuel engine system?
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