Slurry oxidation device and method for jet air exhaust desulfurization tower

Abstract

The invention discloses a slurry oxidation device and method for a jet air exhaust desulfurization tower. The device comprises a desulfurization tower and a slurry tank at the lower part of the desulfurization tower. A plurality of jet flow oxidation devices are tangentially arranged along the circumference of the slurry tank. The jet flow oxidation devices firstly extract the slurry in the slurry tank, the slurry is mixed and oxidized with air in the jet flow oxidation devices, high-pressure mixed fluid is jetted into a neutralization area in the tangential direction, a uniform swirling flow field is formed in the slurry in the inscribed circle direction and re-oxidization is carried out, so that the jet flow oxidation devices can replace a stirrer and a large oxidation fan. The method and the device not only solve the problems of oxidation air pipe blockage, non-uniform oxidation flow field and high slurry temperature of the traditional oxidation device, but also improve the oxidation efficiency, and have the characteristics of small occupied space, low energy consumption, simple system and the like.

Description

technical field [0001] The invention relates to an oxidation process in a wet flue gas desulfurization device, in particular to a slurry oxidation device and method for a jet extraction desulfurization tower. Background technique [0002] With the rapid development of thermal power plants, the emission of SOx is constantly increasing. Excessive discharge of SOx will not only endanger human health, but also form acid rain. Acid rain will damage the ecological environment and cause huge economic losses. Metallurgy, papermaking, cement, shipbuilding, ceramics and other industries also have huge flue gas desulfurization pressure. [0003] Wet limestone / gypsum flue gas desulfurization system is the most widely used desulfurization system. [0004] Among them, the oxidation system is one of the most important energy-consuming systems in the wet limestone / gypsum flue gas desulfurization system. Optimizing the existing oxidation system has very important energy-saving significanc...

AI Technical Summary

Problems solved by technology

[0009] (1) It is necessary to use an oxidation fan to provide oxidation air, which consumes a lot of energy;

[0010] (2) The oxidation air enters the desulfurization tower after being heated by the oxidation fan, which will increase the temperature of the slurry and reduce the desulfurization reaction rate of the slurry. Many devices are forced to install a slurry cooler;

[0011] (3) Structural blockage is prone to occur in pipelines such as oxidation air ducts;

[0012] (4) It is necessary to design a special water distribution system for flushing, the pipe network is complicated, and the maintenance cost and initial investment have increased;

[0013] (5) need to be equipped with a stirrer

In order to keep the slurry in a flowing state, after start-up, even if the absorption tower is out of service, the agitator must continue to run, resulting in the agitator being easy to wear and increasing maintenance costs;

[0014] (6) The contradiction between blowing in enough air and preventing air bubbles from being sucked by the circulation pump is not well coordinated. When the volume of air bubbles sucked by the circulation pump exceeds 3%, the liquid-gas ratio is reduced and the cavitation of the pump is aggravated; when the flow rate of the oxidizing air is adjusted to When the air inhaled by the circulation pump is reduced, the oxidation rate will decrease and the desulfurization efficiency will decrease. In severe cases, it will also make it difficult to deslurry the gypsum

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