Method and apparatus for processing waste air including oxynitride

Abstract

The invention relates to a processing method and a processing device for nitric oxides-containing exhaust gas. The processing method comprises the steps of collecting the nitric oxides-containing exhaust gas into a nitric oxide oxidator to have an oxidation react with ozone from ozone generator to convert the whole nitric oxides into CO2; introducing the CO2-containing exhaust gas and polyethylene glycol absorption liquid into a first filling absorption tower via an gas inlet and a liquid inlet respectively to have a counter current contact in the filling layer, after the first-stage absorption, introducing said gas obtained by first-stage absorption into a second filling absorption tower to have a second stage absorption, and exhausting the absorbed exhaust gas via an exhaust port. Polyethylene glycol is used as absorbent in the invention with stable absorption capability and high absorption saturation, thereby improving removing rate of nitric oxides and reducing processing cost of nitric oxides-containing exhaust gas.

Description

technical field [0001] The invention relates to a method for treating waste gas containing nitrogen oxides, in particular to a method for treating waste gas containing nitrogen oxides by using polyethylene glycol as an absorbing liquid. The invention also relates to a processing device for carrying out the method. Background technique [0002] Nitrogen oxides (NOx) are one of the most widespread air pollutants. Its main hazards are: 1. Under the sun, it can undergo a series of photochemical reactions with hydrocarbons to generate photochemical smog; 2. Generate acid rain; 3. Nitrogen oxides in the stratosphere have a destructive effect on the ozone layer; 4. .Stimulate the human respiratory system, and even cause bronchitis; 5. Reduce crop production, die trees, damage metals, etc. In recent years, by SO 2 The air pollution caused by , CO and smoke dust has been reduced, but with the rapid development of the petrochemical industry, the scope and amount of nitric acid used...

AI Technical Summary

Problems solved by technology

Wet treatment has the advantages of simple process and equipment, less investment, etc., and some can recover NOx, which has certain economic benefits, but the disadvantage is that the purification efficiency is low

[0005] The technical and economic estimates of the above-mentioned main methods for controlling nitrogen oxides show that, except for the alkali absorption method, which still has a certain economic profit, the other methods all cause economic losses to a certain extent.

Although the lye absorption method can be carried out under normal pressure, the absorption rate is fast, the tail gas emission is easy to meet the standard, and it has the advantages of low investment and low operating costs, but the value of the generated salt products is low, and the lye system is usually corrosive. , Careless operation may easily cause secondary pollution

[0006] For many years, researchers have been working on the process improvement of nitrogen oxide wet treatment, including trying to use multiple towers in series for multi-stage absorption, using active fillers, etc., but the effect is very limited and it is difficult to meet the treatment requirements

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