Charging purification method and device for aluminum electrolysis flue gas two stage blowing

Abstract

The invention discloses a two-stage-jetting feeding purification method of aluminum electrolysis fume and a device thereof. The method comprises the following steps: a fume branch pipe in front of an air inlet of an aluminum electrolysis fume dry purification system is added with a mixing drum; the upper end of the mixing drum is connected with an inlet branch pipe of a deduster of the aluminum electrolysis fume dry purification system, and the lower end of the mixing drum is connected with an outlet of a main fume purification pipe; the aluminum electrolysis fume moves from the bottom up in the mixing drum; two jetting devices are arranged in the mixing drum, the one arranged at an inlet end of the mixing drum is an fluorine-borne aluminum oxide jetting device, and the other one arranged at an outlet end of the mixing drum is a fresh aluminum oxide jetting device; and the fluorine-borne aluminum oxide jetting device performs a first-stage feeding purification on the aluminum electrolysis fume with high fluorine content which enters the mixing drum, and the fresh aluminum oxide jetting device performs the second-stage feeding purification on the fume processed by the first-stage feeding purification. The method is characterized by having low manufacturing cost and operation cost and saving adsorbent, and being capable of helping obtain higher fluoride purification efficiency.

Description

technical field [0001] The invention relates to a feeding purification method and device for two-stage injection of flue gas from aluminum electrolysis, and belongs to the technical field of flue gas purification. Background technique [0002] The flue gas discharged from the electrolytic aluminum plant contains a large amount of fluoride, mainly hydrogen fluoride. When the fluoride content in the air exceeds the standard, it will cause direct harm to human eyes, skin and respiratory organs. Excessive inhalation of fluoride by the human body will cause bone sclerosis, hyperostosis, plaque-like teeth and other fluorosis bone diseases, and in severe cases, people will lose their ability to work. In order to protect the ecological environment and protect human health. All electrolytic aluminum production plants attach great importance to the purification of flue gas generated during the aluminum electrolysis process in order to reduce the emission of flue gas containing fluor...

AI Technical Summary

Problems solved by technology

The method of putting the adsorbent is generally to put it directly, and then rely on the turbulence of the flue gas itself to achieve the natural mixing of the adsorbent and the flue gas, so this method has uneven mixing, which affects the purification effect of the flue gas; there is another method is The VIR overflow method is adopted. If the air supply volume and air supply pressure of this method are small, the feeding and mixing effect is also unsatisfactory. If the air supply volume and air supply pressure are increased, the energy consumption will be high, which is not conducive to the energy saving of the system. At the same time, the production is relatively complicated

Images