Method for carrying out uncatalyzed direct oxidation treatment on gas containing nitric oxide by using Venturi oxidizer

Abstract

The invention belongs to the treatment field of nitric oxide, in particular relating to a Venturi oxidizer and a method for carrying out uncatalyzed direct oxidation treatment on gas containing nitric oxide by using the same and air or oxygen. The method comprises the following steps: feeding the gas containing the nitric oxide into the Venturi oxidizer, evenly mixing the gas with the breathed air or oxygen in the Venturi oxidizer, sufficiently oxidizing, and absorbing the reacted gas by absorption liquid to effectively remove the nitric oxide. The processing method of the invention is in no need of catalyst, has advantages of low operation cost, simple equipment, low investment, easy operation and wide applicable range and is free of maintenance basically. The management discharge of themethod can be higher than millions of cubes per hour. The method can be applied to chemical process and flue-gas denitration treatment. The product is nitric acid or nitrate, which has recovery valueand good economic benefit as well as high purification efficiency. The content of the nitric oxide in tail gas can be reduced to below 300 even 100mg / Nm<3> and new pollution does not occur in the processing process.

Description

(1) Technical field [0001] The invention belongs to the field of nitrogen oxide treatment, in particular to a Venturi oxidizer and a method for non-catalyzed direct oxidation treatment of nitrogen oxide-containing gas using the Venturi oxidizer. (2) Background technology [0002] Flue gas contains a certain amount of nitrogen oxides. In some chemical production processes, such as the production of nitric acid, the production of nitric acid oxidation, such as the preparation of hexanoic acid and adipic acid, and the production of nitromethane by dimethyl sulfate, etc. Large amounts of nitrogen oxides are also produced. After these nitrogen oxides are discharged into the atmosphere, they cause great damage to the ecological environment. [0003] Because nitric oxide in nitrogen oxides is extremely difficult to absorb (10% NaOH solution still can't fully absorb), so it needs to be treated with more complicated treatment methods. Commonly used methods are reduction and oxidati...

AI Technical Summary

Problems solved by technology

The main disadvantages of this method are: 1. Use urea or ammonia as reducing agent (catalyst is often needed), and the final product is nitrogen with low recovery value, and the operating cost is high; 2. Reduction can only be carried out at a certain temperature, which is not suitable 3. Improper operation will cause new pollution (ammonia pollution)

However, due to insufficient mixing, incomplete oxidation, and low purification efficiency; the content of nitrogen oxides in the tail gas of the first absorption tower is 3000mg / Nm 3 above; the content of nitrogen oxides in the tail gas of the second absorption tower is 1500mg / Nm 3 Left and right, it cannot be discharged directly, and a catalytic burner and a waste heat boiler have to be added after the second absorption tower, and methane or hydrogen is injected for reduction

The equipment investment and operating costs of this method are relatively high, and the nitrogen oxide content in the tail gas is still as high as 700-800mg / Nm 3

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