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          The EGCS of the exhaust gas desulfurization system developed by Shanghai Hengyuan Marine Equipment Co., Ltd. includes open-loop seawater desulfurization system, closed-loop seawater desulfurization system and hybrid desulfurization system. The SOx removal rate can reach 98%, which can meet the different needs of shipowners.The EGCS has obtained the CCS principle approval certificate.

          Basic parameters
          S+crubber Choose special stainless steel, corrosion preventive and thermostabilitythe. Gas residence time and SOx reduction effect are fully considered
          Water cleaning unit Highly integrated, unmanned automatic operation
          Control system Unmanned automatic operation, system self-diagnostics
          Exhaust gas monitoring PLC can be used to control automatic back blowing, automatic drainage, automatic calibration to ensure long-term work
          Wash water monitoring Easy operation, minimum maintenance, cost-effective, space efficient installation
          Spray module Corrosion preventive, thermostability, good atomization effect and anti-clogging
          NaOH system Set up isolation room, the cabinets, pipes and pumps are anticorrosive

          Detailed information

          Marine transport of international goods transport has become widely accepted due to large volume, security, economy and other advantages, nearly 90% of global trade is transported by ocean. Followed by a sharp increase in the number of ocean vessel, and thus caused serious air pollution and ocean pollution. The international requirements on emissions of SOx are determined by the MARPOL 73/78 Annex VI, which specifies a global limit and a local limit on the sulphur content in marine fuel. The specified sulphur limit will change according to the illustration in Fig. below, showing a reduction in ECA from 1.0% to 0.1% sulphur in 2015, and a reduction in the global limit from 3.5% to 0.5% sulphur in 2020.


          When open-loop mode is used, the natural chemical composition of seawater neutralizes the impact of SOx in the scrubber water. The water is taken directly from the sea and fed to the scrubber. The water is discharged into the sea without any further treatment. When closed-loop mode is used, the seawater is circulated to spray, to neutralise the sulphuric acid in the wash water, an addition of chemicals (NaOH) is needed. To avoid an increase in salinity and contamination of the system, the sulphate and PM must be removed continuously, and add some seawater. Before discharging the wash water, the cleaning process is performed in a water cleaning unit (WCU) and the sludge is led to a sludge tank to meet the IMO criteria. The hybrid desulfurization system combines open-loop and closed-loop processes, and has two running modes, which provide maximum flexibility. The open-loop mode is typically used in open waters where the alkalinity is sufficiently high for effective scrubbing. The closed-loop mode is used in certain enclosed waters, harbours and estuaries or where the alkalinity of the seawater is low. This combination optimises the chemical consumption and ensures that discharges do not affect sensitive areas.