Method for removing nitrogen oxides in industrial waste gas

Abstract

The invention discloses a method for removing nitrogen oxides in industrial waste gas. The method comprises the following steps: solution preparation, wherein solid ammonium bicarbonate is added into a mixing tank with industrial water through a hopper and mixed with the industrial water under the stirring effect of a stirrer of the mixing tank to generate a 20% ammonium bicarbonate solution; delivery, wherein the ammonium bicarbonate solution is delivered to an addition site through a delivery pump and then added into a waste gas generator at a set flow through regulation of a flow meter and a control valve; reaction, wherein the ammonium bicarbonate solution is atomized to be dispersed into tiny liquid drops, the reaction temperature is controlled to be within 800-850 DEG C, the pressure in the waste gas generator is controlled to be normal pressure or micro negative pressure, it is guaranteed that the reaction time is no shorter than 1 min, and ammonia gas, water and carbon dioxide are generated after the reaction. By means of the method, the nitrogen oxides in the industrial waste gas are effectively removed, and compounds which can influence the environment or pollute a system will not be generated.

Description

technical field [0001] The invention relates to a method for removing nitrogen oxides in industrial waste gas. Background technique [0002] At present, the nitrogen oxides (NO 2 and NO) are among the most important air pollutants. The harm of nitrogen oxides is mainly reflected in the following aspects: 1. The formation of acid rain and acid fog; 2. The destruction of the ozone layer; 3. The formation of photochemical smog and secondary pollution; 4. Harm to the human body. In order to protect the environment, the following methods are often used in industry to remove nitrogen oxides. [0003] The first method is to use ammonia as a reactant to react with nitrogen oxides to generate non-toxic nitrogen and water. The specific chemical reaction formula is: [0004] 4NO+4NH 3 +O 2 →4N 2 +6H 2 o [0005] 2NO 2 +4NH 3 +O 2 →3N 2 +6H 2 o [0006] However, ammonia water has a strong pungent smell and corrosiveness, which is not conducive to operation, as evidenced by...

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Problems solved by technology

[0010] Although the danger of urea is obviously lower than that of ammonia water, urea can undergo condensation reaction at high temperature to produce biuret, triuret and cyanuric acid, which will be decomposed when heated to 160°C, and ammonia gas will be formed at the same time Isocyanic acid, which has a great influence on the effectiveness of the urea reaction and will cause secondary pollution

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