The principle and technology of nitrogen denitrification was introduced in this paper

nitrogen removal method of selective catalytic reduction（SCR） compared with other low NOx technology economy

two sets of denitration device were taken as an example

which were installed and operating in 2×700 MW units

Xinchang power plant

and focuses on some influence on the boiler performance

structure

and air preheater running state of flue gas denitrification system（SCR）. It is provided reference for other power plants with similar system layout.