ANDRITZ SeaSOx exhaust gas cleaning sysems

Scrubbers for the maritime industry - ANDRITZ SeaSOx

Clean air is the basis of a healthy life. With this in mind, ANDRITZ has developed its SeaSOx technology, which is the right solution for cleaning exhaust gas in order to meet the new requirements effective since January 1, 2020 aimed at reducing air pollution. ANDRITZ offers a complete portfolio for exhaust gas cleaning in the maritime industry. The exhaust gases from marine diesel engines contain harmful air pollutants such as sulfur dioxide, nitrogen oxide, and complex particulate matter.

These pollutants pose a considerable risk to human health and to the environment. The ANDRITZ SeaSOx technology is the right answer to comply with the new legal requirements worldwide, and the SeaSOx Scrubber Solutions – as I-type (inline) or U-type (bypass) in round or rectangular form – and SeaSOx Dual-/Multi-Filtration plants for SOx, NOx and fine particulate removal can minimize the environmental impact of maritime vessels. With ANDRITZ SeaSOx Port solution as additional option you even can meet the IMO MARPOL Annex VI regulations in the ports without a scrubber nor using compliant fuel.

ANDRITZ SeaSOx Scrubbers

Designed on the basis of more than 35 years of experience in scrubber design and using the most highly developed CFD models to simulate and optimize flow distribution and SOx mass transfer the maritime scrubbers offer some decisive benefits.

Successful installation: Complete retrofit of ANDRITZ SeaSOx Filtration system to La Méridionale´s 40 MW RoRo ferry Piana.

ANDRITZ SeaSOx technology  – exhaust gas cleaning systems for the marine industry

Piana_IMG_20190509_132544_by ArminEhrenhoefer
Product development contract for 3-in-1 exhaust gas treatment

Following successful installation of the first SeaSOx filtration system in April 2019 and award of the retrofit order in May 2021, the next milestone – improving our dry filtration technology – is moving into focus.

DAZ Departure 1
Next successful commissioning of a hybrid scrubber at Chengxi shipyard

In challenging times, ANDRITZ has succeeded in completing deliveries and start-up of the hybrid

SeaSOx scrubber system for "Dole Aztec" on time.

Piana (20190511)_Final_Mailing
ANDRITZ receives an order from La Méridionale for the full retrofit of a SeaSOx filtration system on the RoRo ferry Piana in France

Full retrofit of the vessel with a Dual SeaSOx filtration system includes cleaning of the exhaust from three additional main and two auxiliary engines, covering a total propulsion load of more than 40 MW. This project represents a new milestone in terms of exhaust gas cleaning without requiring any wash water.

Largest hybrid scrubber installed at Chengxi Shipyard on container vessel operated by the Dole Food Company

The American shipowner Dole has ordered hybrid scrubbers to be installed in Q1 2021 for two of its newly built vessels.

SeaSOx wet scrubber for RoPax ferry “Marco Polo”

The German shipowner TT-Line installed two SeaSOxwet open-loop scrubbers (one scrubber per main engine) in December 2019 and January 2020 for their RoPax ferry Marco Polo (previously Barbara Krahulik).

Dole Chile13
Two ANDRITZ SeaSOx wet open loop scrubber systems for Dole Chile & Dole Colombia

Dole, operating between the United States, South America and Europe as the world's largest producer of bananas and pineapples, ordered two SeaSOx wet open loop scrubber systems in October 2019 for their reefer container vessels. Each ship has one main engine with 23.9 MW and four auxiliary engines, two of which have 2.8 MW and two with 3.8 MW. The total power output of each vessel is about 37 MW. ANDRITZ is responsible for engineering and supply of all the main equipment, such as pumps, scrubber tower, valves, CEMS and I&C. Retrofitting of the first ship has been scheduled for August 2020, with the second vessel to follow in September 2020. With this technology, Dole is able to burn High-sulfur Fuel Oil (HFO) and thus comply with the new emission regulations that come into force on January 1st, 2020.

Dole NB 4.28-18 nice
Two ANDRITZ SeaSOxwet hybrid scrubber systems for the Chinese Chengxi Shipyard

The Chinese Chengxi Shipyard has ordered two SeaSOx wet hybrid scrubber systems in June 2019 for their container vessel newbuilds, which will be operated after completion by the Dole company. The two ships will start operation in October and December 2020. Even if the delivery time seems to be long, the yard needed the complete engineering package at a very early stage to implement the scrubber system in their ship design planning. In addition, these projects are the first references for a hybrid version of the SeaSOx technology, and mark therefore an important milestone in the development of this booming market. Hybrid means, that the system can operate in Open Loop (sea water is used as absorption media) and Closed Loop mode (caustic solution is used as absorption media). Additionally, the discharge water of the Closed Loop process has to be treated to reach the environmental limits.

The ships are equipped with one main engine with 16 MW and four auxiliary engines with 2 MW each. Hence, also the combination of different sources is a new design point, which is a very important reference in this market. ANDRITZ is responsible for engineering and supply of all main equipment like pumps, scrubber tower, separator, heat exchanger, valves, CEMS, and I&C.

MED-G CERTIFICATION - Important milestone reached

With the MED-G certification from the DNVGL classification society, ANDRITZ has received its first confirmation of safety and environmental compliance for a scrubber installed on a maritime vessel. This certification is necessary in order to obtain a permit to continue operating the ship with high-sulfur fuel and using an SO2 removal unit. In this special case, it is also a world premiere because the MV Piana uses the innovative SeaSOxdry technology. No other ship globally has an installation using this kind of technology. SeaSOxdry not only removes SO2, but

also particulates, there is no plume produced at the stack outlet. In addition, no water is discharged. Hence, this certification marks an important milestone in bringing this promising technology forward and also gaining acceptance for it from other clients. The dry SO2 removal solution is a very attractive technology, especially for ferries operating in European waters.

ANDRITZ SeaSOxwet (Wet exhaust gas desulphurization system)

ANDRITZ Air Pollution Control to retrofit a wet SeaSOx scrubber on a 300 m long bulk carrier, operating between Chile and China. The agreement was signed in July 2018 to install a SeaSOxwet system having a square footprint with very low space requirements of 2.8 m side length for one main engine with 18.66 MW. The system was designed for removal of SO2 from 3.5 to 0.5%S and will be installed in September 2019.

PIANA Arrivée à MARSEILLE Dimanche 29 Avril 2018 (1)
ANDRITZ SeaSOxdry (Dry exhaust gas desulphurization system)

ANDRITZ and SOLVAY sign first agreement with La Méridionale to remove SOx with a dry scrubber.

ANDRITZ Pulp & Paper booth at ABTCP 2023

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Control de la Calidad del Aire – Chile

Clean environment for a better tomorrow. ANDRITZ provides innovative clean air technologies, including wet flue gas cleaning, dry flue gas cleaning, DeNOx plants, and combined or multi-stage systems.

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Exhaust gas emissions from marine diesel engines, mainly containing nitrogen oxides, sulfur oxides, carbon dioxides, and complex particulate matter (PM), are a big concern for human health and the environment. In response to these concerns, the International Maritime Organization (IMO) has introduced regulations for emission control under Annex VI of the MARPOL Convention. Annex VI imposes a framework of mandatory limits on emissions of sulfur oxides (SOx) and nitrogen oxides (NOx), both globally and within designated sea areas known as Emission Control Areas (ECA).

The regulations specify the sulfur content allowed in the fuel to limit the SOx emission. A ship may burn fuel with a higher sulfur content, providing that SOx emissions are controlled to a level that is not higher than the levels emitted when using compliant fuel. In order to comply with the new regulations, ships must either use expensive, low-sulfur fuel or install exhaust gas cleaning units. Based on the operating profile of maritime vessels, exhaust gas cleaning can secure enormous savings in fuel costs and thus provide payback periods of between one and three years. The ANDRITZ SeaSOx technology is the right answer to meet the new requirements and can be installed on all types of maritime vessels, either on a new build or retrofit basis thanks to its flexibility.

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  • ANDRITZ Scrubbers for the maritime industry PDF : 6.6 MB
  • ANDRITZ SeaSOx Scrubber PDF : 2 MB
  • SeaSOx Dual/Multi Filtration technology for maritime applications PDF : 524 KB
  • Ship & Offshore Magazine / Article about ANDRITZ SeaSOx

    Dry desulphurization and dedusting processes

    PDF : 810 KB
  • Clean Shipping International-Issue Winter 2019 / Article about ANDRITZ SeaSOx


    PDF : 3.5 MB
  • Clean Shipping International-Issue Spring 2020 / Article about ANDRITZ SeaSOx

    CFD-optimized high-velocity spray scrubber

    PDF : 2.6 MB