A system and method for oxidizing a sulfite solution

Abstract

The invention belongs to the field of flue gas purification, and provides a system for oxidizing a sulfite solution, which is used for oxidizing ammonium sulfite in the solution. The system comprises an oxidation vessel, an oxidation fan and an oxidation air hose, wherein the oxidation fan is arranged outside the oxidation vessel and is connected with the oxidation air hose, the oxidation air hose stretches into the oxidation vessel and comprises an oxidation main tube and an oxidation branch tube, and a water injector is arranged above the oxidation main tube. The invention also provides a method for oxidizing the sulfite solution. According to the system, the oxidation air can be uniformly distributed in the solution at the bottom of the oxidation vessel, the air and solution can be well contacted without using a stirrer, the oxidation efficiency of the ammonium sulfite reaches over 95%, and the oxidation efficiency of the ammonium sulfite is guaranteed while the purpose of energy conservation is realized; in the initial running stage of the oxidation fan, original liquid in an air distribution tube is extremely easy to be discharged, and when air distribution holes are blocked, the air pressure in the oxidation air hose is kept stable, so that the service life of the oxidation fan and the oxidation air hose can be prolonged.

Description

technical field [0001] The invention belongs to the field of flue gas purification, and in particular relates to a system and method for oxidizing absorption liquid produced by wet flue gas purification. Background technique [0002] Thermal power and iron and steel enterprises will emit a large amount of flue gas during the production process, and the flue gas contains dust, SO 2 , SO 3 , NO X and CO and other toxic substances, of which SO 2 It is the main substance that forms acid rain, so desulfurization is an important measure for environmental governance. Among desulfurization methods, wet desulfurization is currently the most commonly used desulfurization method. Among them, the ammonia desulfurization technology uses ammonia as the absorbent. Its process is simple, the desulfurization efficiency is high, and no secondary pollution is generated. At the same time, the desulfurization by-products have high economic value, which is in line with the national circular e...

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Problems solved by technology

[0006] 1. Stirrer-air spray gun method (such as CN201342315Y, CN20134317Y, CN201092536Y, CN201324592Y), although this method can obtain a higher sulfite oxidation rate, but the equipment is complicated, the operating cost is high, and the stirrer often fails due to corrosion and other reasons ;

[0007] 2. Annular (such as CN101244365A) or finger-shaped (such as CN201092538Y) air oxidation method. In this method, the oxidized air is evenly distributed in the tower, but at the initial stage of the oxidation fan operation, the liquid in the air distribution pipe is not easy to discharge, resulting in a relatively low instantaneous power of the fan. At the same time, due to the uneven force of the air in the distribution pipe, the vibration of the air pipe is serious, and problems such as burnout of the oxidation fan and breakage of the air distribution pipe are prone to occur.

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