Clean Marine scrubber

Clean Marine offers exhaust gas cleaning systems (EGCS) for the marine industry, also known as scrubbers. The IMO Annex VI sulfur regulation calls for a 0.1% sulfur limit in emission control areas (ECA) by 2015 and a worldwide limit of 0.5% by 2020, or 2025 at the latest. The Clean Marine exhaust gas cleaning system removes sulfur and harmful particulate matter (PM) from the ship’s flue gas in accordance with IMO regulations.

Product features of the exhaust gas cleaning system

A spray of seawater and caustic soda (NaOH, 50% aqueous solution) into the exhaust gas flow regulates the sulfur trapping efficiency. This happens automatically based on the feedback from the emission monitoring system, which analyses the SO2/CO2 relation in the cleaned exhaust gas released to air.

As the system works independently of the combustion units and the automatic NaOH feed governs the cleaning efficiency, the operation is simple and robust. The NaOH feed also limits the pH reduction caused by the neutralisation process, which makes demands on the materials less severe and provides a longer system lifetime at a lower cost.

Compact multi-streaming EGCS solution

The importance of PM capture is the background for the sulfur emission limits and the development of emission control areas. The Clean Marine EGC unit has a high-speed cyclone (advanced vortex chamber – AVC) incorporated in the design, providing considerably high PM and liquid droplet trapping. Clean Marine has, since 2004, focused on developing a compact and integrated multi-streaming EGCS solution.

Clean Marine EGCS.
Exhaust gas cleaning system (EGCS) retrofit installation example.
Installation of Clean Marine scrubber with integrated multi stream manifold.
Entire exhaust gas cleaning system (EGCS) shown inside vessel.
New funnel lowered in place to cover the already installed scrubber.
MV Balder leaving Croatia.

A fan and gas recirculation feature (BDR) allows one EGC unit to serve all combustion units simultaneously. This feature ensures that the backpressure in the exhaust pipes, and therefore the efficiency of the combustion units, is undisturbed. With zero backpressure requirements, the single scrubber also serves your boiler in addition to the main and auxiliary engines.

Except for the fans and pumps there are few moving parts, which makes maintenance tasks rare and inexpensive. Clean Marine is happy to supply a quotation or information related to the installation of a scrubber onboard your new building or existing ship or fleet of ships.

Operation of the exhaust gas cleaning system

To use the Clean Marine EGCS, the operator will use a laptop, or we can integrate the user interface to an existing system or to a marine energy management system. A push button menu will adapt the EGCS for seagoing full-speed operation or for stay in port. During sea trials, the system is tuned; for example, the fan speed and NaOH dosing are controlled automatically with the use of variable frequency drives and PLC. The exhaust gas cleaning system can be remotely surveyed via the ship’s LAN, and satellite communication system if available. Download of compliance logs is also possible if connected to the system.

Our system works equally well in open and closed (fluid recirculation) modes. According to IMO Annex VI there is no restriction on discharge of water containing sulfate as long as PAH, turbidity, pH and nitrate levels are within certain levels. Clean Marine offers optional closed-loop mode operation in addition to open mode to satisfy any additional local port requirements.

Installation and retrofit of EGC units

When selecting an EGCS unit, we identify the highest practical amount of exhaust gas produced by all exhaust sources connected to the unit during normal operation mode. Clean Marine also includes a margin, which will ensure gas recirculation through the BDR.

When retrofitting an EGC unit this may be done adjacent to an existing funnel or inside an enlarged funnel. We provide naval architect assistance and class-approved drawings needed for the EGCS placement and any required structural changes onboard. Clean Marine will provide installation specification and our personnel will survey the installation and carry out commissioning. For new buildings the builder will generally incorporate the EGCS into the ship design, with the EGC unit located inside the funnel.

A pioneer within the maritime EGCS industry

Clean Marine has thorough knowledge of the shipping industry, which is embedded in the exhaust gas cleaning system design and in how we plan and execute installations.

Click on the link to our website, or email Clean Marine, to investigate further the possibilities and payback time related to installing an exhaust gas cleaning system onboard your vessel.

Have a look at Clean Marine’s corporate video.

You can also watch a 3D simulation of what the system looks like inside a vessel.