| 摘要 |
The present invention relates to a method and a system to scrub an exhaust gas from an engine of a vessel. The present invention provides a desulfurization method to discharge gas from a vessel to reduce consumed energy while maintaining allowable desulfurization performance, and generates a leaked liquid which is less limited. Exhaust gas (1) is transferred to a desulfurization scrubber (100) wherein a first seawater flow (2′) flows, and the concentration of sulfur dioxide is permanently measured in gas (7) purified by a scrubber. A flow velocity of the first seawater flow (2′) is controlled in accordance with a measurement of the concentration of the sulfur dioxide, and the leaked liquid of the scrubber (100) is collected in an oxidation device (300). An air current (3) flows into the oxidation device, and ferric salt flow (6) flows into the oxidation device directly or through the scrubber (100). Oxidation-reduction potential is permanently measured in an outlet of the oxidation device (300), and the flow velocity of the air current (3) and/or the flow velocity of the ferric salt flow are/is controlled in accordance with the measurement of the oxidation-reduction potential. The flow leaked from the oxidation device (300) is transferred to a post-dilution device (500), and the post-dilution device is located at a depth of 10 meters or less than the scrubber (100). Second seawater flow (2′′) flows into the post-dilution device, and a pH is permanently measured in the outlet of the post-dilution device (500). The flow velocity of the second seawater flow (2′′) is controlled in accordance with the measurement of the pH. |
