Quicklime slaking apparatus and method used for coke oven flue gas desulphurization

Abstract

The invention relates to a quicklime slaking apparatus and method used for coke oven flue gas desulphurization. The apparatus comprises a slaking tank, a motor, stirring shafts, blades, a temperature control device and separator plates, the separator plates are arranged in the slaking tank to separate the inner cavity of the slaking tank into a plurality of areas, one stirring shaft is arranged in every separated area, every stirring shaft is provided with two groups of blades, the groups of the blades have opposite tilting directions, the diameter / propeller pitch angle of one group of the blades is more than that of the remaining group, and the temperature control device is also arranged in the slaking tank. The temperature change of a liquid in the tank is controlled in the invention, so the quicklime slaking rate is improved. Arrangement of the flow of a lime slurry in the tank is helpful for proceeding a slaking reaction and enhances solid and liquid mixing. A guiding flow flows according to a required path, so deposition at the bottom of the tank is reduced, the stirring capacity is enhanced, the particle size of the solid is refined, the slaking reaction is promoted, pipeline obstruction is reduced, and the desulphurization technology effect is improved.

Description

Technical field [0001] The invention relates to a liquid preparation for coke oven flue gas rotary atomization desulfurization, in particular to a quicklime digestion equipment and method for coke oven flue gas desulfurization. Background technique [0002] Metallurgical or chemical plants that use fossil fuels as energy sources usually emit large amounts of fly ash and SO 2 Flue waste gas such as harmful acid gas. In order to remove the atmospheric pollutant SO in flue gas 2 Components, there are three main current mainstream desulfurization methods: wet desulfurization, semi-dry desulfurization and dry desulfurization. Among them, semi-dry desulfurization has an advantage over wet desulfurization in terms of energy consumption, floor space and product treatment, and its desulfurization performance for medium and low temperature flue gas is superior to dry desulfurization, so people are paying more and more attention. [0003] The temperature of coke oven flue gas in the coking i...

AI Technical Summary

Problems solved by technology

The stirring ability of traditional lime digestion equipment for desulfurization is not strong, and the flow of lime slurry is insufficient; the temperature control of digestion reaction is only adjusted by the ratio of raw materials and process water, and cannot achieve accurate control

Due to the above reasons, the digestion reaction rate of quicklime raw materials is not high, and the resulting suspension has a large solid particle size and many agglomerates, which in turn has a major adverse effect on the entire desulfurization process.

[0005] CN201120458654.0 discloses a sintering flue gas desulfurization digestion tank, which is also used for rotary spray semi-dry desulfurization. In order to solve the problems of slow speed of quicklime solution and difficult discharge of sand deposited at the bottom, a slurry mixer in the feeding area is added number of blades, and change the tank bottom angle

However, the tank body in the discharge area of ​​this equipment is easily "short-circuited" by the discharge port. There is no modification to the blades, and there is no temperature control device, which does not solve the problems of insufficient quicklime digestion and large solid particles in the suspension. Process issues that have a significant adverse effect

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