As
shipping enters the final lap in the race towards meeting the IMO sulfur
cap by January 2020, the industry faces an expensive dilemma in making
ships more environmentally sustainable, a meeting was told.
Some 112 delegates debated the potential of exhaust gas cleaning
systems (EGCS) or scrubbers addressing the emissions regulations, at an
IMarEST UAE branch seminar sponsored by Kamelia Cleantech, a Unique
Group company.
Nikeel Idnani, IMarEST UAE’s branch Honorary Secretary, in his opening
introduction, said that shipowners tread with caution in an industry
that is no longer awash with money, yet must comply with what the
regulators of the IMO have pledged to deliver against a firm timescale.
Idnani argued that scrubber bans ordered by some countries appeared to
be merely ‘politically correct’ to follow by environmentalists, without
necessarily having a scientific base to back up the decision.
Nevertheless, he emphasised that this does not shred the economics of
installing the systems, on a ship-specific basis.
In a double presentation, Kaisa Marton (Kamelia Cleantech managing
director) and Dr Sharad Kumar (Group Director, Unique Group and Kamelia
Cleantech COO) outlined the alternative solutions to comply with the IMO
2020 legislation, including OPEX, CAPEX and opportunity losses for the
solutions. They then highlighted the cleaning efficiency required in
2020, including the washwater discharge rules.
While explaining the reaction chemistry between exhaust sulfur in
contact with water, Marton admitted that the pH of the scrubbing
effluent can be between 2.4 - 4.5 depending on the fuel sulfur content,
scrubbing efficiency, amount of water used and engine load.
This could have corrosion implications and environmental challenges in
selected locations with brackish waters, such as the Baltic Sea.
The use of closed loop scrubbing can be justified for these areas
because the lack of natural alkalinity can be compensated by the
addition of chemicals. Nonetheless, Seawater has excellent capacity to
buffer changes in pH due to its alkalinity. Seawater salinity is a good
indication of its alkalinity.
Dr Kumar explained the pros & cons of U-type and inline, as well as
the working principle of open loop, closed loop and hybrid scrubbers.
Following best industry practices, he proposed a holistic and
integrated approach to scrubber delivery, including contracting a
shipyard for the installation work, an engineering company for the
integration engineering, contracting a naval architect to check the
designs and vessel integrity enabling seamless co-ordination of the four
different parties resulting in an efficient working solution.
Marton highlighted that critical design factors to consider were engine
sizes and performance criteria, funnel dimensions and existing space on
the vessel, ship systems, ship geometry, class and flag.
For the project planning stage, it is important to factor ship
operation patterns and schedules, drydocking schedules, opportunity
losses if the ship is taken out of operation, possibilities to carry out
as much work as possible while the vessel is in service, available
accommodation on board for the riding gang, plus lifting arrangements on
board and at strategic ports.
On a practical note, she shared Kamelia Cleantech’s experience with
challenges faced during installation and operation and potential
solutions and commented on Kamelia’s capability to offer turnkey
solutions and on the voyage installation options available.
She admitted that heavy fuel consuming ships, mostly on long ocean
passages, were the low hanging fruit from an economic perspective to
install scrubbers. With a payback period ranging from six to 18 months,
depending on the LSFO premium, amid the commercial realities facing the
industry, this option is the more financially astute choice.