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Design

COIS/COUS/COBOS series EGC systems are self-developed by ContiOcean and have earned approval certificates from multiple classification societies including CCS, DNV GL, LR, ABS, BV and NK, which has established ContiOcean as the leading company in the flue gas desulfurization area. The ContiOcean EGC system is applicable to cargo ships, luxury cruises, ro-ro ships, ferries and offshore platforms which use HFO as the main fuel. The product design team of ContiOcean has extensive experience in product research, design and development, and is capable of designing customized marine desulfurization equipment for different vessel types on the market. Since establishment, ContiOcean has always been pursuing for short design cycle, precise design scheme, high-quality product equipment and straightforward operation mode to serve every customer.

System Introduction

ContiOcean EGC system mainly includes three types: open loop system, close loop system and hybrid system.


Open Loop System: Sea water is chosen as the washing media and pumped into the scrubber by sea water pump to react with exhaust gas and dissolve the SOx to achieve desulfurization. .


Close Loop System: Alkaline wash water is chosen as the cleaning media for exhaust gas and will be circulated in the close loop system for reuse and stored in system cabinet. When the system starts, circulating pump will extract wash water from the system cabinet and pump it into the scrubber before being cooled by heat exchanger. Meanwhile, sea water will be used as make-up water and cooling water in the process. Water treatment system will continuously extract wash water from the cabinet for treatment to meet water quality requirement. Alkaline liquid will be continuously supplemented for desulfurization reaction.


Hybrid system: The open system and the closed system are integrated into one system.

  • Open-loop component of the system
  • Closed-loop components of the system
Product Comparison
Item ContiOcean Product Other Product
1 Material of Scrubber tower Alloy 31 is chosen as the main material due to the excellent heat resistance and corrosion resistance. SMO 254 is the main material. May cause scrubber body corrosion due to long-time use.
2 Scrubber tower structure and installation Scrubber tower chooses welded or bolted connection instead of flange to avoid leakage. Scrubber tower uses flange joint which may cause water leakage. Scrubber tower higher than 10m is supported by 4 I beam.
3 Scrubber tower connection and interface Scrubber tower will be customized designed during engineering design process to achieve best retrofitting effect. Allinlets are designed with 10-degree angle of inclination to avoid accumulated water. Scrubber tower design is fixed and engineering design company can only conduct retrofitting according to designed pipeline. In this case, best retrofitting design can not be guaranteed.
4 Water draining Drain water outlet diameter is 1.5 times bigger than inlet and cone angle for draining at the bottom is 65°, which can avoid accumulated water. Drain water outlet diameter is 1.3 times bigger than inlet and cone angle for draining at the bottom is 70-75°, which may cause accumulated water.
5 Packing Packing has random inclined structure with 20%back pressure.
6 Spray nozzle No movable parts. Rotating blades are installed inside spraynozzle for some designs.
7 Hardware-in-the-loop test (HIL test) ContiOcean cooperates with DNV-GL to conduct HILtest. HIL test can simulate working conditions of the workshop before installation and ensure the reliability of electrical control system, which cangreatly save the commissioning time.
Design drawings