Comprehensive treatment method and apparatus for exhaust gas pollutants of marine diesel engine

Abstract

The invention discloses a comprehensive treatment method and apparatus for exhaust gas pollutants of a marine diesel engine. The apparatus comprises a venturi washing device, a hypergravity reactor, awaste liquid cabinet, an oxidant aerosol generating device, an aerosol reaction zone, an electrostatic defogging device, an air compressor and a waste gas storage tank. The method and device make thegas-liquid contact more fully, and significantly increase the reaction rate. The reaction consumes less medicament, the fresh water consumption of a ship and the amount of medicines carried on the ship are reduced. The size of the hypergravity reactor is small, and the occupied space of a cabin of the ship is greatly reduced. The waste gas storage tank is connected to a scavenging system of the marine diesel engine, and the amount of nitrogen oxides of the diesel engine is directly reduced by a way of exhaust gas recirculation. The exhaust gas in the waste gas storage tank can also be used asinert gas of the ship.

Description

technical field [0001] The invention belongs to the technical field of prevention and control of air pollution caused by ships, and in particular relates to a comprehensive treatment method and device for marine diesel engine exhaust pollutants. Background technique [0002] In the world's cargo transportation, ship transportation is favored because of its advantages in large volume, safety, and economy. In my country, more than 90% of foreign trade goods are transported by ocean-going ships. Ocean-going ships mostly use low-speed two-stroke diesel engines fueled by heavy oil and other low-quality fuel as the main power plant. The exhaust gas after burning low-quality fuel contains a large amount of NO x , SO x , PM and other pollutants. According to statistics, NO caused by ships x , SO x of global anthropogenic NO emissions x , SO x More than 15% and 5% of the total emissions will cause serious harm to the atmospheric environment and human health. [0003] In the fa...

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Problems solved by technology

[0005] In the prior art, the SCR method is used to denitrify the flue gas, but this method has problems such as large device size, ammonia escape, and easy poisoning and failure of the catalyst. system, to a certain extent, can control ship exhaust NO x emission, but it affects the thermal efficiency of the diesel engine, and the corrosion and wear of the diesel engine is accelerated due to the inhalation of particulate matter; the sodium-alkali washing system is used to remove SO in the exhaust gas of ships x , but a single desulfurization treatment cannot reduce the NO in ship exhaust x remove

At present, some scholars have proposed a marine diesel engine exhaust gas treatment technology that combines wet scrubbing technology with exhaust gas recirculation. For example, it is proposed to reintroduce a part of the exhaust gas after desulfurization treatment to the scavenging box to form an exhaust gas recirculation system. Reduction of Marine Diesel Engine NO x The amount of generation, but this method cannot remove the particulate matter in the exhaust gas, and increases the wear and tear on the cylinder

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