Carbon calcination fume dry cleaning method and device thereof

Abstract

The invention relates to a dry purification of emitted smoke dust containing fluoride, tar, dust and other harmful substances, in particular to a carbon roasting smoke dust dry purification method and a device thereof, the suction of an induced draft fan leads the smoke dust to enter a dry bottom type cooler to carry out the cooling process to lower the temperature, aluminum oxide in a reactor is utilized as an absorbent to carry out the absorption process of the fluoride, the tar and other harmful substances in the smoke dust, the separation filtration process of gas and the mixed solid is carried out in a bag dust collector, after the separation filtration, the gas is discharged from a chimney by the induced draft fan, the aluminum oxide is recycled, and other aluminum oxide containing the absorbed substances enters a collecting chamber by the collection as raw materials of electrolytic aluminum for standby. The process flow of the invention is simple, the one-time purification of the smoke is thorough, no pollution is generated, the aluminum oxide can be simultaneously recycled, the technology is advanced, the degree of automation is high, the production operation cost is effectively reduced, the technology is economic and reasonable, the removing efficiency of the smoke dust can achieve more than 99 percent, the content of the smoke dust in the emitted smoke dust is 10mg / Nm<3>, the content of tar is 10mg / Nm<3>, and the content of fluoride is 1mg / Nm<3>, which are higher than the national emission standards.

Description

technical field [0001] The invention relates to a dry purification method and device for smoke emission of fluorine, tar and harmful substances, in particular to a carbon roasting smoke dry purification method and device. Background technique [0002] The smoke and dust produced in the roasting furnace of the carbon factory contains a large amount of dust, tar, fluorine and other harmful substances. These substances will cause serious harm to animals, plants and human body, especially fluorine is highly corrosive. All are highly toxic. At present, most of the treatment of carbon roasting smoke is by electric tar capture device, which can only collect tar and dust, and cannot deal with fluorine. Excessive fluorine in the smoke and dust discharge will cause great harm to the environment. Electric tar capture device captures and filters The tar and dust become viscous liquid, which seriously corrodes the equipment, reduces the service life of the equipment, and causes secondar...

AI Technical Summary

Problems solved by technology

At present, most of the treatment of carbon roasting smoke is by electric tar capture device, which can only collect tar and dust, and cannot deal with fluorine. Excessive fluorine in the smoke and dust discharge will cause great harm to the environment. Electric tar capture device captures and filters The tar and dust become viscous liquid, which seriously corrodes the equipment, reduces the service life of the equipment, and causes secondary pollution to the environment

In addition, the traditional purification method also uses wet purification, washing the dust with a solution of sodium carbonate water, so that the hydrogen fluoride gas in the dust becomes sodium fluoride that can dissolve in water and enters the liquid. At the same time, it is sprayed to cool the dust and the tar in the dust After condensation, the dust in the flue gas enters the liquid and floats on the surface, and asphalt fume and other gases that do not react with the alkali liquid are discharged directly. This wet purification only turns part of the harmful gas in the flue gas into water-soluble salts. Also use lime water and lotion to make harmful fluoride ions in the lotion into calcium fluoride solids that are incompatible with water and then filter and discharge. However, the lotion cannot be completely treated, and harmful solid waste residues will be produced, forming secondary waste. Pollution, in addition, lye severely corrodes the equipment, and the overall operating cost is high

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