A combined removal method and device for multiple pollutants in ship exhaust gas

Abstract

The invention discloses a novel ship exhaust gas multi-pollutant combined removing method. The novel ship exhaust gas multi-pollutant combined removing method comprises following steps: exhaust gas discharged by a ship diesel engine is delivered through an electromagnetic field, and is separated into relatively clean gas flow and particle-enriched gas flow; the particle-enriched gas flow is delivered into a cyclone separator, is processed, and then is mixed with the relatively clean gas flow; obtained gas flow is delivered into a wet washing device, and is processed using the wet washing device; a part of obtained waste gas is discharged into the air directly, and the other part of the obtained waste gas is delivered into the ship diesel engine via a recirculation bypass pipe. The invention also discloses a novel ship exhaust gas multi-pollutant combined removing apparatus comprising a cylindrical flue gas channel; and the wet washing device is communicated with the cyclone separator. The novel ship exhaust gas multi-pollutant combined removing method is capable of reducing secondary pollution of impurity components of waste liquid such as oil-containing particles on ocean environment, and separating recovery difficulty of solid particles, increasing clean degree of recirculated exhaust gas, and minimizing corrosion wearing of diesel engines.

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 combined removal method and device for multi-pollutants in ship exhaust gas. Background technique [0002] According to statistics, more than 90% of international trade in the world is carried out by sea, and the vast majority of merchant ships use diesel engines as the prime movers for the main propulsion device and power generation device of the ship. With the development of the world economy, the exhaust gas emitted by ships has caused serious environmental pollution in recent decades. According to the statistics of relevant organizations, on a global scale, the air pollution caused by exhaust emissions from marine diesel engines accounts for about 5-10% of the entire air pollution, and even as high as 30-40% in some areas such as port cities. According to the statistics of the International Maritime Organization (...

AI Technical Summary

Problems solved by technology

[0008] According to the existing technology proposed above, there are high equipment investment and operating costs, large device volume, secondary pollution and reduced ship safety, and the recirculated exhaust gas in the existing exhaust gas recirculation technology (EGR) is not clean enough, resulting in engine thermal efficiency. reduce technical problems, and provide a combined removal method and device for multi-pollutants in ship exhaust gas

Images