Combined desulphurization and denitration device and method of marine diesel engine

Abstract

The invention discloses a combined desulphurization and denitration device and method of a marine diesel engine. The exhaust gas of the diesel engine is divided into two paths, wherein one path enters a denitration channel A and is recirculated to an air cylinder to participate in burning so as to lower the NOx emission of an engine; the other path enters a desulphurization channel B and is discharged to ambient atmosphere after being subjected to desulphurization processing. In the denitration channel A, the exhaust gas flows through components including a one-way stop valve, a Venturi scrubber, a cooler, a cleaning device, a blower and the like, particles and SO2 in the exhaust gas are removed through processing processes including pre-washing, cooling, washing, pressurizing and the like, and finally, the exhaust gas is mixed with fresh air from the intake channel of the diesel engine to enter the air cylinder and participate in burning; in the desulphurization channel B, the exhaust gas is discharged into the environment atmosphere after being subjected to particle removal by washing tower desulphurization. The Tier III requirement of IMO (International Maritime Organization) on marine fuel sulphur content and NOx emission in the exhaust gas can be met, and meanwhile, the corrosion and the abrasion on an engine compressor, a cylinder liner and the like by the exhaust gas can be lowered.

Description

technical field [0001] The invention relates to a device for controlling discharge of exhaust gas pollutants from ships, and also relates to a method for controlling discharge of exhaust gas pollutants from ships. It specifically relates to the technology of scrubbing and removing SOx and NOx from the exhaust gas of the ship power plant in order to meet the regulations of the International Maritime Organization (IMO) on the discharge of ship exhaust pollutants. Background technique [0002] According to the requirements of Annex VI of the IMOMARPOL73 / 78 Convention, in the global region, starting from January 1, 2020, the sulfur content of fuel oil in ship power plants will be reduced from the current 3.5% to 0.5%; while in the sulfur oxide emission control area (SECA ), since January 1, 2015, the upper limit of sulfur content in ship fuel has been reduced to 0.1%; on January 1, 2016, IMO will implement Tier III standards for NOx emissions in the Nitrogen Oxide Emission Contr...

AI Technical Summary

Problems solved by technology

On the one hand, the mass flow rate of the exhaust gas is large, the heat content is high, and the cooling effect of the cooler is high; on the other hand, the circulating exhaust gas at this time is a high-temperature and high-pressure gas, which contains more available energy, and the cooling process will increase energy loss. , reducing the thermal efficiency of the engine

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