A papermaking white mud desulfurization device and desulfurization process

Abstract

The invention belongs to the technical field of power plant desulfurization, and relates to a novel papermaking white mud desulfurization device and process. The device comprises a spiral stirring mixer, a high-shear dispersion homogenizing pump, a static mixer, high-pressure jetting atomization nozzles, microwave generators, ultrasonic oscillation tower plates, an ultrasonic conical hopper and a centrifuge. The process includes the steps that potassium persulfate, water and papermaking white mud are mixed, the mixture is introduced into the spiral stirring mixer, the high-shear dispersion homogenizing pump and the static mixer in sequence, is then jetted into a tower through the high-pressure jetting atomization nozzles, passes through the microwave generators and the multiple ultrasonic oscillation tower plates in the falling process, and finally falls to the tower bottom, smoke generated in coal combustion is dedusted and then rises from the bottom in the tower, the papermaking white mud mixed liquor flows downwards, and the smoke and the papermaking white mud mixed liquor make full contact and react. According to the desulfurization process, it is unnecessary to perform PH value regulation or desilicication or the like on white mud, water is directly added for mixing and diluting, and then the mixture can be applied, so that the procedure is simple and low in energy consumption, desulfurization is thorough, complete desulfurization and dedusting are achieved, and great promotional value is achieved.

Description

technical field [0001] The invention belongs to the technical field of desulfurization in power plants, and in particular relates to a desulfurization device and a desulfurization process for white mud for papermaking. Background technique [0002] Coal contains sulfur, and sulfur generates sulfur dioxide and sulfur trioxide during the combustion of coal. If sulfur dioxide and sulfur trioxide are discharged into the atmosphere, they will cause serious air pollution. So people invented the desulfurization process. One is to absorb sulfur dioxide and sulfur trioxide with lye; Exhaust into the atmosphere, the use of calcium carbonate needs to be mined and destroys the natural environment; China is a big papermaking country, and a large amount of white mud will be produced in the process of pulp production. The main component of white mud is calcium carbonate and contains some lye. In principle, It is said that containing lye is beneficial to absorb sulfur dioxide and sulfur tr...

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Problems solved by technology

So people invented the desulfurization process. One is to absorb sulfur dioxide and sulfur trioxide with lye; Exhaust into the atmosphere, the use of calcium carbonate needs to be mined and destroys the natural environment; China is a big papermaking country, and a large amount of white mud will be produced in the process of pulp production. The main component of white mud is calcium carbonate and contains some lye. In principle, It is said that containing lye is beneficial to absorb sulfur dioxide and sulfur trioxide, but in actual production, it is necessary to wash away the lye and keep the pH value between 5.8-6.2, so that calcium ions exist and react with calcium ions and sulfate ions Calcium sulfate is generated; at the same time, there is a problem of calcium sulfate deposition, so people add magnesium oxide to papermaking lime mud to solve this problem; at the same time, it is also necessary to remove silicon compounds in papermaking lime mud, especially straw pulp white mud with a silicon content as high as 11%, the presence of silicon leads to the formation of calcium silicate, which is dense in texture and difficult to wash off, causing pipeline blockage and affecting normal production, power generation and desulfurization

The principle of washing away silicon is simple, but so far has not realized industrial production, which seriously restricts the desulfurization application of straw pulp white mud; the existing white mud desulfurization process still has solidification phenomenon, that is, the surface of calcium carbonate particles is formed The shell of calcium sulfate prevents the calcium carbonate inside from reacting with sulfuric acid, which reduces the utilization rate of calcium carbonate and increases the energy consumption of equipment

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