Ship exhaust gas desulfurization device

Abstract

The invention discloses a ship exhaust gas desulfurization device. The device comprises a desulfurization spray unit and pretreatment flues on both sides of the desulfurization spray unit. A pre-spraying layer is arranged in the pretreatment flue. A spraying layer is arranged in the desulfurization spray unit. A flow guiding unit for receiving exhaust gas from the pretreatment flue, uniformly distributing gas flows and feeding the gas flows into the spraying layer. The desulfurization spray unit is connected to a defogging unit for absorbing moisture of particles in the tail gas purified by the spraying layer and growing and separating the particles. The device has long gas-liquid contact time and high desulfurization efficiency and improves the space utilization rate of the ship.

Description

technical field [0001] The invention relates to a desulfurization device, in particular to a ship tail gas desulfurization device. Background technique [0002] The rapid development of shipping transportation has brought a huge impact on the global environment. Ocean-going ships generally burn heavy oil or residual oil, and the exhaust gas often contains a large amount of sulfur oxides. In order to protect the environment, the International Maritime Organization Marine Environmental Protection Committee (IMO) To formulate strict emission standards, the purification of ship exhaust is imminent. [0003] The existing technology mainly realizes emission standards by purifying the flue gas after combustion. The desulfurization system is generally very large, especially the core equipment desulfurization device often takes up a lot of space. Due to the particularity of the ship’s navigation, the space on the ship Limited and excessive occupation of space on board will affect th...

AI Technical Summary

Problems solved by technology

[0004] At present, most of the desulfurization devices for ships use seawater to directly spray spray towers. Due to the low alkalinity of seawater, it often needs to be sprayed in large quantities for a long time. Therefore, such spray towers will be designed to be heightened to meet the discharge requirements. desulfurization effect, but the heightened design will increase the weight of the desulfurization device, and the center of gravity will move up, which will affect the stability of the center of gravity of the ship

At the same time, there is often a problem of uneven airflow distribution inside the spray unit, which is specifically manifested as: the airflow velocity on the side opposite to the flue gas inlet is faster, while the flow velocity on the other side opposite to this side is slower, and even a backflow zone occurs

The unevenness of the flow rate will cause the difference in the residence time of the flue gas in the tower, resulting in insufficient reaction time on one side and too long reaction time on the other side, resulting in low desulfurization efficiency of the system. In order to make the sulfur emission meet the standard, the size of the tower is designed relatively small Large, takes up valuable space on the ship

In addition, the existing wet desulfurization devices tend to produce small droplets with desulfurization liquid during operation. Generally, the demister can handle droplets above 50 μm, but it is difficult to handle droplets below 50 μm. Relevant modifications are required

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