Nitrogen oxide in flue gas is mainly nitric oxide.
Flue gas denitrification has catalytic decomposition method, selective catalytic reduction method, but also the use of high temperature activated carbon absorption denitrification.
In the operation of coal-fired boilers, a large amount of slag and fly ash collected by dust removers must be discharged.
Since the 1950s, people have made great efforts to develop comprehensive utilization of ash and slag, turning harm into benefit.
Building materials such as cement, brick and concrete aggregate are made from ash.
Since the 1970s and from the fly ash extraction of hollow microbeads, as refractory insulation materials.