Oxygen supply method and device suitable for ship emission seawater desulfurization

Abstract

The invention discloses an oxygen supply method and an oxygen supply device suitable for ship emission seawater desulfurization. Oxygen-containing flue gas is pressed into an absorption tower slurry tank by using the pressure of the flue gas through a flue and an air inlet main pipe, a slurry cyclone is formed in the absorption tower slurry tank by using circumferential nozzles on a plurality of layers of air inlet branched pipes arranged horizontally in the absorption tower slurry tank, and the slurry cyclone can play a role in stirring, so that disturbance of the slurry is reinforced; and the flue gas-carrying slurry sprayed from the downward nozzles are impacted downwards and then baffled upwards, so that the residence time of the flue gas is prolonged, and the utilization rate of oxygen in the flue gas is improved. The device is reasonable in structural design, and has the characteristics of uniform distribution, long residence time and high oxidation utilization rate of the flue gas in the slurry; and a stirring device and an oxidation fan are not used, and an aeration tank link for the seawater desulfurization is eliminated, so that the equipment size of a seawater desulfurization system is effectively reduced, the space of a ship is saved, and the application of the seawater desulfurization process in ships is realized.

Description

technical field [0001] The invention relates to the technical field of ship pollution prevention, in particular to an oxygen supply method for seawater desulfurization and a device for implementing the method. Background technique [0002] At present, most large ocean-going ships use low-quality residual oil as fuel. The average sulfur content of fuel oil is 2.7%, and some are as high as 3.5% or even 4.5%. According to reports, ships emit 6.34 million tons of SOx every year, accounting for about 4% of the world's total emissions. The sulfur oxides in the exhaust flue gas have caused serious pollution to the surrounding environment, which has attracted the attention of the International Maritime Organization (IMO) . In order to reduce air pollution caused by sulfur oxide emissions from ships, the amendment to Annex VI of the MARPL Convention imposes strict restrictions on the emission standards of sulfur oxides (SOx), and restricts the emission of sulfur oxides in ship exhau...

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Problems solved by technology

[0004] The purpose of the present invention is to provide an oxygen supply method and device suitable for seawater desulfurization of ship waste gas, to solve the technical problems of the existing seawater desulfurization process, such as the large area occupied by the aeration tank, the complex structure, and the high cost.

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