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Scrubber for exhaust gas cleaning


Capacity range

Up to 10 MW (1-tower system), up to 20 MW (2-tower system)

SOx removal rate


Modes of operation

Open Loop and hybrid operation

Meeting IMO conformity

The overwhelming majority of ships around the world operate using engines and boilers powered by heavy fuel oil. The resulting combustion exhaust gases that are emitted contain soot and sulfur oxides that pollute the environment. The gradual reduction of limit values is now creating a need for action amongst shipping and charter companies. As a result, gas-powered or dual fuel units are playing an increasingly important role in new ships even though gas-based propulsion systems are expensive, and the fuel is exposed to significant price fluctuations. In addition, ports around the world lack the necessary infrastructure to bunker fuel gas and there is the question of usability over long distances. There is also the factor that the conversion to dual fuel is a complex and expensive challenge. The SAACKE EGCS-HM scrubber is a more efficient and sustainable alternative for the maritime industry.

System infrastructure and cleaning process

The SAACKE hybrid multistream exhaust gas cleaning system can be connected to main and auxiliary engines as well as boilers. Two fans, connected in parallel, bring the exhaust gas flow from the emitters together and conduct this into the wash tower. In the first stage of the spray nozzle wash tower, the exhaust gases are conducted through an atomized water spray consisting of sea water. The second step consists of a water cascade. In this process, the sulfur components in the exhaust gas are washed out with 50 m3 of water per hour for each megawatt of main engine power (when using heavy fuel oil with a sulfur content of 3.5%). The result is 99 percent sulfur separation.

Decisive benefits of the SAACKE solution

The scrubber can be operated in both a 1-tower as well as a 2-tower system, where different performance capacities can be combined. This means that it can be flexibly adjusted to individual operating conditions. Its short amortization time, often only about 2 years, makes it an attractive option for both new constructions as well as upgrades. Experienced SAACKE personnel will take over the commissioning and supervision of the construction for the customer. Moreover, the system, which fully satisfies the IMO MEPC.259(68) regulation, is available as an open and hybrid water cycle. The exhaust gas cleaning control and automation system, the EGCS management system, is integrated into the ship’s system. The HMI (Human Machine Interface), a user-friendly touchscreen in the control cabinet, displays all relevant operational data. A remote HMI is established in the engine control room to allow operations to be conducted from this central location.

All operating data can be viewed using the EGCS monitor, which is installed on a computer on the ship and networked to the control cabinet. With a few clicks, the monitoring system creates an emission report, which not only shows emissions data, but combines this with geodata and periods of time that can be configured individually. In addition to storing data on the ship, the data can be stored with a mobile data connection (mobile communications or satellite), making them available to the ship-owner at all times via the SAACKE EGCS monitor. This means that the live monitoring of all relevant plant data is possible on the ship as well as onshore, which enables the optimization of the ship’s operation as well as identification of associated savings potentials. A special protocol ensures the compressed and tamper-proof transfer of the data, resulting in minimum costs for data traffic. The data is then saved on servers requiring authentication.

In conclusion, the efficient and practical engineering reflects SAACKE's decades of experience in the field of maritime applications.