Nitrogen oxide absorption process
A nitrogen oxide and process technology, applied in the field of nitrogen oxide absorption technology, can solve the problems of poor purification effect, low technical level, low purification efficiency, etc., and achieves good purification effect, simple absorption process and high purification efficiency. Effect
Inactive Publication Date: 2013-10-02
RUGAO JINLING CHEM
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Problems solved by technology
Since the lye absorption method can recover nitrogen oxides into nitrite or nitrate products, it has certain economic benefits, and the process and equipment are relatively simple, and the technical route is mature. It is widely used in the treatment of nitrogen oxides in industrial waste gas. , but the main disadvantage of this method is that the technical level is not high, the purification efficiency is low, and the purification effect is not good
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Embodiment 1
[0030] The exhaust gas from the acidification reactor is introduced into the static pressure box (8000Nm 3 / h), and enter the first-stage absorption tower after being oxidized by supplementary wind and once diluted. The concentration of nitrogen oxides in the gas at the inlet of the absorption tower is 7818mg / m 3 In the first-stage tower, the acid urea solution with a pH of 2 to 3 is used as the absorbent, and the exhaust gas is fully contacted with the acid urea absorption solution. After a relatively ideal mass transfer, most of the nitrogen oxides in the exhaust gas are absorbed by the absorption solution. removal, the concentration of nitrogen oxides at the outlet of the primary tower is 1072mg / m 3 ;
[0031] The absorption reaction formula of acidic urea solution is as follows:
[0032] 6NO 2 +4 (NH 2 ) 2CO → 7N 2 ↑+4CO↑+8H 2 o
[0033] 6NO +2 (NH 2 ) 2CO → 5N 2 ↑+2CO↑+4H 2 o
[0034] Then it is sent to the secondary purification tower through the outlet throug...
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The present invention provides a nitrogen oxide absorption process, wherein a liquid absorption method is adopted, a liquid absorption treatment process is an acid urea liquid and sodium hydroxide alkaline solution combined treatment process, series operation of two absorption towers is adopted to treat acid nitrogen oxide exhaust gas discharged from an acidification reaction kettle, a first-stage tower adopts an acid urea liquid with the pH value of 2-3, the reduction agent urea and the nitrogen oxide are subjected to an oxidation reduction reaction under an acid condition, no side reaction is generated, secondary pollution can not be caused, a second-stage tower adopts a sodium hydroxide alkaline solution with a concentration of 5-10%, the alkaline solution has a low nitrogen oxide absorption rate, the optimal purification effect is provided when an oxidation degree of the nitrogen oxide is 50%, and air compensation oxidation is adopted to increase the oxidation degree of the nitrogen oxide. The nitrogen oxide absorption process has characteristics of simpleness, low equipment investment, high purification efficiency, and good purification effect.
Description
technical field [0001] The invention relates to a process for absorbing nitrogen oxides. Background technique [0002] Nitrogen oxides are compounds composed only of nitrogen and oxygen, including a variety of compounds, such as nitric oxide, nitrogen dioxide, laughing gas, nitrogen pentoxide, etc. They are common air pollutants, the main Nitric oxide and nitrogen dioxide. [0003] The treatment methods of nitrogen oxides include reduction method, plasma activation method, biochemical method, adsorption method and liquid absorption method. The liquid absorption method is a method of absorbing nitrogen oxides in the exhaust gas with water or an aqueous acid, alkali, or salt solution to purify the exhaust gas. Therefore, according to the type of absorbent, it can be divided into: water absorption method, acid absorption method, alkali absorption method, oxide absorption method, absorption-reduction method and liquid phase combination method. Since the lye absorption method...
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IPC IPC(8): B01D53/78B01D53/56
Inventor 黄海波黄奎生王宏黄雪平
Owner RUGAO JINLING CHEM