A method and device for electrolytic flue gas purification without power injection feeding

Abstract

The invention discloses a method and device for electrolytic flue gas purification without power ejection and feeding. There is an injection blowing device, and a feeding device is installed above the injection injection device; the flue gas enters the reactor cylinder from bottom to top, and a negative pressure is formed at the upper plane of the nozzle of the injection injection device, and passes through the upper plane of the nozzle. The negative pressure at the place attracts the outside air to be ejected from the nozzle, and the alumina flowing out of the feeding device is blown into the reactor cylinder to mix with the flue gas. The invention realizes injection feeding without external power, and reduces the energy consumption and cost of the purification system. It will not cause strong wear and tear to the equipment, and it will not easily cause alumina damage, and it will not cause "slag shell" to block the feeding channel, thus ensuring the efficient and stable operation of the purification system. The invention can also reduce the operating cost of the enterprise, reduce the discharge of pollutants, and have good economic and social benefits.

Description

technical field [0001] The invention relates to a non-powered injection feeding method and device for electrolytic flue gas purification, belonging to the technical field of harmful flue gas purification. Background technique [0002] A large amount of flue gas containing fluoride will be produced in the production process of the electrolytic cell of the aluminum electrolysis plant, and the main pollutant is hydrogen fluoride. Excessive inhalation of fluoride by the human body can cause bone sclerosis, bone hyperplasia, plaque-like teeth and other fluorosis bone diseases, and in severe cases, people will lose their ability to work. Fluoride also has a strong stimulating and corrosive effect on the respiratory mucosa and skin. my country's health standards stipulate that the maximum allowable concentration of fluoride (calculated as fluorine) in the workshop air is 0.5 mg / m3. According to the current national standard "Occupational Exposure to Toxic Hazard Classification" in...

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Problems solved by technology

But at the same time, there are the following disadvantages: 1) Alumina is entrained by the high-speed airflow blown from the nozzle of the gas supply pipe, and is sprayed on the lower diffusion plate at high speed. Due to the high hardness of alumina (second only to diamond), it will affect the diffusion plate. It will quickly cause wear and damage to the equipment; 2) Since the alumina is sprayed on the lower diffusion plate at high speed, the degree of alumina fragmentation is high, which will affect the adsorption capacity of alumina and affect the current efficiency of the downstream electrolytic cell, resulting in electrolytic aluminum Increased energy consumption will affect the economic benefits of aluminum electrolysis production enterprises; 3) Due to the strong friction between the fluorine-loaded alumina and the diffusion plate, due to the special properties of the fluorine-loaded alumina, it is easy to form a "slag shell" on the diffusion plate , block the feeding channel of fluorine-containing alumina, affect the feeding amount of the purification system, reduce the purification efficiency of the flue gas purification system, and damage the environment; 3) Since compressed air is needed as the power to realize the injection of alumina, it is necessary to increase air compression equipment Such as the Roots blower, which increases the energy consumption of the system, increases the workload of equipment maintenance, and affects the economic benefits of the factory.

Moreover, due to the increase of the noise source of the purification system, the working environment of the workers is affected

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