Exhaust gas purification device for marine diesel engine using low-quality fuel such as fuel oil containing high concentration of sulfur

Abstract

Provided is an exhaust gas purification device for a marine diesel engine which enables treatment discharge water to be discharged into special marine areas, and enables waste treatment water to be discharged into areas other than special marine areas even when the vessel is moving, particularly in exhaust gas treatment in a marine diesel engine that uses fuel with a quality equal to or lower than that of fuel oil. In this exhaust gas purification device for a marine diesel engine using fuel with a quality equal to or lower than that of fuel oil, a gas cooler is provided in the exhaust gas path or an EGR gas path, an electrostatic cyclone exhaust gas purification device is provided downstream from the gas cooler, and a PM-free scrubber which dissolves / removes almost no PM is provided downstream from an electric dust-trapping means.

Description

technical field [0001] The present invention relates to carbon-based particulate matter (Particulate Matter, hereinafter referred to as "PM"), sulfur oxides (hereinafter referred to as "SOx"), nitrogen oxides, etc. (hereinafter referred to as "NOx") and other harmful gases are removed and purified for ships, power generation, industrial use, etc., especially heavy oil [heavy oil (Fueloil) is marked as diesel oil (Dieseloil: DO) in the ship industry Diesel fuel (MarineDieselFuel: MDF) or marine diesel oil (MarineDieseloil: MDO), marine fuel oil (MarineFueloil: MFO), heavy fuel oil (HeavyFueloil: HFO), residual fuel oil (ResidualFueloil: RFO), but in the present invention, These signs are collectively referred to as the exhaust gas treatment technology of large-displacement marine diesel engines with low-quality fuels below heavy oil (Dieseloil). More specifically, it involves large exhaust gas that discharges high-temperature exhaust gas. A device for purifying exhaust gas usi...

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Problems solved by technology

[0019] That is, the electrical treatment method and device for exhaust gas of a diesel engine described in the aforementioned Patent Document 1 ( Figure 27 ), has the following problem: because the flow direction length of the exhaust gas flow of the electrode needle 24 in the discharge charging part 22 is short, and the collecting plate 23 is arranged in a right angle direction with respect to the flow direction of the exhaust gas flow, in addition, the exhaust gas The flow is directly in contact with the collecting plate 23, so the flow resistance (pressure loss; pressure loss) is large; since the collecting plate 23 is thin, the length of the flow direction of the exhaust gas flow is short, so there is a concern that PM can pass through without hindrance, and there is a possibility that it will not be possible Danger of sufficiently increasing PM capture efficiency; PM once passed through the capture plate 23 is not captured charged due to re-corona discharge, but discharged as it is

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