Nitrogen oxides produced by industrial use of nitric acid
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How to deal with the nitrogen oxides produced by industrial nitric acid use? If the oxidation degree is high? What to do if the degree of oxidation is low? If the oxidation degree of the exhaust gas is very low and the concentration changes in a large range (intermittent emission), how to deal with it? After searching online, the main technical methods include: 1. Low NOx combustion technology. 2. Catalytic reduction method: Can be divided into SCR and NSCR. 3. Liquid absorption method: It can be divided into water absorption, acid absorption and alkali absorption. Is there any environmental enthusiast who can give some advice?
Absorption with alkali solution is the easiest method to operate. Regardless of its concentration, it can be absorbed by adding the amount of alkali solution. At the same time, nitrate or nitrite can also be used, and these absorbents can be processed into products. Other methods have their own advantages, and are more technically complex and difficult to master.
Sofa is right, alkali absorption is indeed very convenient. However, I have also seen that many factories emit emissions directly. Alas, I feel sorry for the common people. Like the situation you mentioned, "the oxidation degree of the exhaust gas is very low and the concentration changes in a wide range (intermittent emission)" combustion or SCR or NSCR are difficult to operate. It seems that some places use water to absorb it, or they add less alkali.