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Besides the closed loop version the Langh Tech scrubber is also available in an open loop and a hybrid version that combines both models...

The Langh Tech water treatment system can be used to clean the water from both sources; the closed loop SOx scrubber and the EGR system...

Langh Tech's SOx scrubber is environmentally friendly as it can be operated continuously in closed loop mode without any time limits or big holding tanks...

Closed loop scrubber
Open loop scrubber
Water Treatment System
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Closed loop scrubber

Langh Tech's SOx scrubber is environmentally friendly as it can be operated continuously in closed loop mode without any time limits or big holding tanks.

 

The closed loop process utilizes fresh water in addition to suitable alkali, which can be caustic soda or magnesium. No untreated process water is pumped overboard during operation. No dilution, no tricks. Just a unique water treatment process to handle the process water. More than 90% of the process residuals are extracted from the process water flow, which makes the equipment very environmentally friendly.

​The scrubber tower design can be either inline or side-inlet type (U-type) and with either single or multiple inlets. The scrubber can be dry running or use a bypass.

 

The Inline scrubber tower attenuates sound and can replace the silencer. The scrubber tower is always tailor-made to each project and is therefore available in many different sizes from small towers for 1MW engine power up to large towers for 70 MW engine power. Not only can one main engine but also multiple flue gas sources be connected into one inline scrubber with the manifold that collects all the flue gases together and feeds them to scrubber.

The scrubber is equipped with a packing bed which has better performance than using multi-level water sprays only. The packing bed intensifies chemical reactions, thus enabling smaller scrubber size and less water flow through the scrubber. The applied packing bed material is robust and therefore the back pressure - the pressure drop trough the scrubber tower - maintains low.

 

The scrubber can be equipped either with one or two packing beds. A tower with one packing is ideal for a vessel where vertical space for the scrubber tower is limited, whereas a two packing bed tower is taller but slimmer in diameter, which makes it a perfect solution for vessels where the space inside the funnel or engine casing is limited. It is especially designed for RoPax/RoRo and cruise vessels where every inch matters in the narrow casings.

Scrubber tower design either inline or side-inlet typ (U-type)

Caustic soda or magnesium can be used as a chemical

Open loop and hybrid scrubber

Besides the closed loop version the Langh Tech scrubber is also available in an open loop and a hybrid version that combines both models.

​The scrubber tower design can be either inline or side-inlet type (U-type) and with either single or multiple inlets. The scrubber can be dry running or use a bypass.

In open loop mode sea water is utilized as process water. Alkalinity – salinity and carbonates – act as process reactants to reduce sulphur oxides (SOx) to the desired level. This simple in-out process is efficient and easy.

The hybrid scrubber is a combination of best performance and flexibility as this high-end product combines the best sides of the closed loop and open loop modes.

 

The owner can make the decision which mode is to be used and when. This solution provides technical and environmental efficiency in a handy way.

​The scrubber tower design can be either inline or side-inlet type (U-type)

Langh Tech hybrid scrubber can be operated continously in closed loop

Water Treatment System

CLOSED LOOP WTS

The Langh Tech Water Treatment System for closed loop scrubber is reliable, efficient and easy-to-use. Water cleaning is based on efficient membrane filtration where additional flocculants are not needed. The system has a sludge dewatering function, and thus the amount of waste left over after the closed loop water treatment process is marginal compared to other wet scrubber solutions.

 

The Langh Tech solution manages to extract almost all water from the scrubber sludge and the end result is a dry black waste. The highly concentrated dry sludge is unitized in IBC containers or barrels. Waste disposal is effortless and cost-effective.

The system has no operation time limitations and big holding tanks are not needed. The water treatment system is built from compact size equipment modules which facilitates flexible installation of equipment in the engine room.

 

The modules exist in many different water flow capacities and the required total water cleaning capacity can be achieved by combining suitable modules together.

The unique Langh Tech closed loop water treatment system can also be combined with other manufactures’ scrubbers.

EGR WTS

Langh Tech has expanded its water treatment technology to new areas. The EGR water treatment system is reliable, efficient and easy-to-use and has similar performance and advantages as the SOx scrubber water treatment system.

Langh Tech has been working in close cooperation with MAN Diesel & Turbo (MDT) to develop a water treatment system to be used for cleaning the process water of Exhaust Gas Recirculation (EGR) systems. EGR is a method to reduce NOx emissions to meet Tier III requirements. In the EGR process, approximately one third of the exhaust gas is recycled back into the engine, first removing the particles from the redirected gases with a small scrubber. The process water from exhaust gas washing is continuously cleaned during EGR operation and this is where Langh Tech’s water treatment technology is applied. The Langh Tech water treatment is based on membrane filtration, meaning that the operational costs are kept low and the waste consists only of small amounts of compact dry sludge.

The first test runs of the system were performed in 2015 at the MDT testing facility in Copenhagen, using a small-scale prototype built into a container. The results were good, leading to a continued and deepened cooperation between the companies. The process has been fine-tuned over time, and a MDT approval for the Langh Tech water treatment system to be used in combination with the EGR process was received in 2016. The approval process includes a long-term testing period in cooperation with MDT.


The Langh Tech water treatment system can be used to clean the water from both sources; the closed loop SOx scrubber and the EGR system. The combined water treatment system lowers the initial investment and requires less space on board the vessel versus the independent systems for closed loop and EGR processes.

No need for sludge tanks

Combined water treatment system for SOx scrubber and EGR

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Vanhamakarlantie 29
FI-21500 Piikkiö, Finland

+358 (0)2 477 9400

 

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