Denitration | Why should ammonia escape be controlled?

Release time:

2022-10-17

Ammonia escape is an important parameter that affects the operation of SCR system. The flue gas temperature determines the reaction effect of SNCR and SCR, and then affects the ammonia escape.

1. Comply with national standard environmental protection requirements

For power generation enterprises, the normal operation of SCR denitration system is to ensure the minimum ammonia escape, and the standard emission of NOx is also a very important task. In most coal power enterprises, the ammonia escape rate is almost zero when the denitration system operates in low efficiency, but there is still a certain possibility of ammonia escape. When the catalyst activity decreases and the concentration of NOx in the tail flue is uneven, ammonia escape will increase. It is necessary to improve the denitration rate to avoid increasing the amount of ammonia escape. Reduce NOx emissions.

2. Ensure long-term safe, stable and economic operation of equipment

The catalyst has a service life. If the catalyst is used for too long, its activity will become invalid or blocked, and the denitration reaction will become worse. In this case, ammonia escape will increase. In this case, the catalyst needs to be replaced in time to ensure the denitration efficiency of ammonia escape. In actual operation, the quantity of denitration system injected is higher than the theoretical value. Although the denitration efficiency increases with the increase of ammonia escape, it will still lead to waste of raw materials, reduce the service life of equipment, and increase the operating cost.