Methods of Reducing the Production of Nitrogen Oxides in the Chimney gases

Nitrogen oxides are one of the most important pollutants in the air, which releasing into the atmosphere causes to produce of dangerous secondary pollutants. Identifying the various methods of reducing this pollutant in the chimney is an important guide for choosing an effective method to achieve the desired level of this pollutant according to the type of industry for experts. In this paper, methods for reducing nitrogen oxides in flue gas flow are reviewed. These methods include chemical processes such as plasma and non-plasma oxidation by an oxidizing agent, catalytic and non-catalytic reduction, electron irradiation, biological process, and physical adsorption processes on the surface. These methods separate nitrogen oxide from a gaseous stream and convert it into inert materials. These methods are very effective for industries that use old technologies and are highly polluting. The main technologies introduced in this article are among the four main methods with developed technology or they are close to development and can be used in Iranian industries.