Marine engine exhaust aftertreatment system based on automatic drainage device

Abstract

The invention provides an exhaust aftertreatment system of a marine engine. The system comprises an engine exhaust pipe, a catalyst, exhaust bypass pipelines, a drainage device and an electric controlunit, wherein an exhaust port of the engine exhaust pipe communicates with air inlets of the catalyst and the exhaust bypass pipelines; the drainage device is arranged behind the catalyst and the exhaust bypass pipelines and located at the bottom of an exhaust tail pipe; the catalyst comprises a bypass valve, a diesel oxidation catalyst DOC and a selective catalytic system; each exhaust bypass pipeline comprises a bypass valve, a pulse damper, a three-way joint or a four-way joint and a back pressure regulating valve; the drainage device comprises a water storage tank, a water level sensor, apressure sensor and a pulse electromagnetic valve. According to the system, the exhaust bypass pipelines are connected to the two ends of the catalyst in parallel, the problem that the operation costof a ship in a non-emission control area is high is solved, and meanwhile the dynamic property and economical efficiency of ship power equipment are improved; by installing the automatic drainage device at the bottom of the exhaust tail pipe, corrosion caused by accumulated water at the bottom of the exhaust tail pipe to the exhaust tail pipe and reduction of conversion efficiency caused by returning of condensed sewage to a carrier are avoided, and the reliability and conversion efficiency of the aftertreatment system are improved.

Description

technical field [0001] The invention belongs to the field of marine engine exhaust post-treatment systems, in particular to a marine engine exhaust post-treatment system based on an automatic drainage device. Background technique [0002] With the development of the shipping industry, the exhaust pollution of ship engines is increasing day by day, and the pollutants discharged include nitrogen oxides (NO X ), sulfur oxides (SO X ), carbon monoxide (CO), hydrocarbons (HC) and particulate matter (PM), etc., and has the characteristics of large fluidity, large diffusivity, and long duration. [0003] Annex VI of MARPOL (International Convention for the Prevention of Pollution), EU (European Union) regulations and CARB (California Air Resources Board) regulations have successively formulated or implemented new sulfur emission control standards, requiring ships to use sulfur content not exceeding 0.1% in designated areas. m / m low sulfur oil. [0004] On December 4, 2015, the M...

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Problems solved by technology

[0007] In view of this, the present invention aims to propose a marine engine exhaust aftertreatment system based on an automatic drainage device to solve the problem of high operating costs of ships in non-emission control areas, while improving the power and economy of ship power equipment , and avoid the corrosion of the exhaust tailpipe caused by water at the bottom of the exhaust tailpipe

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