A device and method for treating nitrogen oxides in condensed acid

Abstract

The invention discloses a device and a method for treating nitrogen oxide in condensed acid. The device comprises a spraying absorption tower, wherein the spraying absorption tower comprises a tower body, the top of the tower body is connected with a fan through a smoke exhaust pipe, and a spraying device, a filler layer, a gas-liquid separation device and a liquid mixing tank are sequentially arranged in the tower body from top to bottom; the gas-liquid separation device comprises a plurality of groups of liquid baffle plates and liquid isolation covers for covering the liquid baffle plates of each group; a liquid outlet is formed in the sidewall of the liquid mixing tank, and the upper part of the liquid mixing tank is connected with an acid mixer and a water inlet pipe. The device also comprises an absorption liquid circulation tank and an absorption pump, wherein the gas-liquid separation device, the absorption liquid circulation tank, the absorption pump and the spraying device are sequentially connected. According to the device and the method, escape of waste gas and production of waste are avoided in the whole process, and the absorption efficiency is high.

Description

Technical field [0001] The invention relates to the technical field of sulfuric acid production, in particular to a device and method for treating nitrogen oxides in condensed acid. Background technique [0002] NO x It is an acid gaseous pollutant and one of the main causes of photochemical smog and acid rain. In the kiln of the front-end device of smelting flue gas sulphuric acid production, as the flame temperature increases, molecular oxygen and nitrogen will generate nitrogen oxides. Especially when oxygen-enriched smelting is used, the production of nitrogen oxides will increase; In the electric precipitator and electric mist eliminator of the device, nitrogen oxides are also generated as the discharge process occurs. The nitrogen oxides in the sulfuric acid production system may be discharged into the atmosphere with the exhaust gas, causing excessive nitrogen oxides during the exhaust gas emission process; it may also enter the finished sulfuric acid, causing the color o...

AI Technical Summary

Problems solved by technology

The nitrogen oxides in the sulfuric acid production system may be discharged into the atmosphere along with the tail gas, causing the nitrogen oxides to exceed the standard during the exhaust gas discharge process; they may also enter the finished sulfuric acid, resulting in a red color of the finished acid and unqualified quality of the finished acid; Concentrated in the acid liquid collected by the fiber demister and converted into the condensed acid of the external heat exchanger, resulting in a large amount of brown smoke during the process of flushing the dry suction mist catcher and discharging the condensed acid from the external heat exchanger, if not Taking corresponding measures in time will not only cause environmental pollution, but also cause certain harm to people.

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