A kind of active industrial flue gas final purification method

Abstract

The invention relates to an active industrial smoke gas tail stage purification method, which comprises the steps that a smoke gas passing pipeline is built; a smoke gas inlet is formed in the lower part of the pipeline; the upper part of the pipeline is provided with a smoke gas outlet; a shaft which is provided with a hairbrush and can rotate at high speed is arranged inside the pipeline; the smoke gas is introduced into the pipeline from the smoke gas inlet; the introduced smoke gas is subjected to homogenization treatment, so that the smoke gas is prevented from generating segregation; the shaft with the hairbrush rotates at high speed; the hairbrush rotating at high speed is used for capturing fogdrop in the smoke gas; under the centrifugal effect, the fogdrop on the hairbrush can be continuously thrown to the inner wall of the pipeline; the flow is downwards guided through the inner wall of the pipeline until the fogdrop flow out through a liquid discharging opening formed in the bottom end of the pipeline; flowing-out liquid is directly discharged into a desulfurizing liquid pool or a denitration liquid pool to be continuatively used; the fog and saline and alkaline type soluble substance removal is completed; meanwhile, during secondary dust removal, only clean water needs to be sprayed on the hairbrush; during secondary desulfurization, only alkali liquid needs to be sprayed on the hairbrush; during secondary denitration, only a liquid phase complexation denitration agent needs to be sprayed on the hairbrush.

Description

technical field [0001] The invention belongs to the technical field of industrial flue gas purification, and in particular relates to an active final purification method of industrial flue gas. Background technique [0002] At present, under the industrial flue gas emission standards, the flue gas discharged from industrial boilers must go through denitrification, desulfurization and dust removal processes to reduce the concentration of nitrogen oxides, sulfur dioxide, and soot to below the standard value, and then industrial flue gas is allowed. released into the atmosphere. [0003] However, the industrial flue gas after denitrification, desulfurization and dust removal still has high humidity, and the industrial flue gas at this stage is mainly discharged into the atmosphere in the form of mist droplets, and in the mist droplets of industrial flue gas , will dissolve a large amount of solute substances such as sulfate, nitrate and desulfurization and denitrification agen...

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Problems solved by technology

[0006] However, the currently used demisters are all passive, with low demist efficiency and dust accumulation. With the increase of dust accumulation, the demist efficiency will be even lower, resulting in weaker and weaker desalination capabilities.

In addition, because the demister adopts a passive method of demisting, the demisting stability is seriously affected by the flue gas flow rate, and the demisting effect is not ideal because the flue gas flow rate is unstable.

[0007] For pollutants such as nitrogen oxides, sulfur dioxide, and dust remaining in industrial flue gas, the existing industrial flue gas final purification technology has not yet been involved. Therefore, it is urgent to fill this technical gap to further reduce the impact of industrial flue gas on the environment. the dirt

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