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SCR denitration technology

A brief description of the technology

Under certain temperature conditions, SCR denitration uses catalyst to make NOx in the flue gas start reduction reaction with ammonia, the reducing agent, -to generate nitrogen and water, thus reducing NOx emission and pollution of flue gas to the environment.

 

Technical features

1. According to the distribution of NOx in flue gas in different spatial positions, the ammonia injection quantity in different regions is controlled by the method of combining numerical simulation calculation with physical modeling test to realize the NOx / NH3 ratio in different regions and a sound mixing effect of NOx and NH3, so as to achieve high NOx removal efficiency and low ammonia escape rate.

2. Numerical simulation is made on flow field and resistance characteristics in the SCR system through CFD for optimal system design;

3. The process has compact equipment and reliable operation;

4. The reduction reaction mainly produces nitrogen and water without any secondary pollution.

 

Applicable scope

Newly built denitration plant or denitration retrofitting

 

Applicable industries

Metallurgy, chemical industry, thermal power plant, etc.

 

Process flow

The supplied liquid ammonia is transported by a liquid ammonia tanker and transferred from the tanker to an ammonia storage tank through a liquid ammonia unloading compressor, conveyed from the ammonia storage tank to a liquid ammonia evaporation tank based on gravity and pressure difference, where it is evaporated to ammonia; after that, it is conveyed to an ammonia surge tank to mix with diluted air blown by a dilution fan in the ammonia/air mixer and sent to an ammonia injection system. At the inlet flue gas duct of SCR, the ejected ammonia and flue gas from the outlet of the boiler economizer mix together and enter the SCR reactor for denitration reaction by catalyst, and then ultimately return to the boiler air pre-heater through the outlet flue gas duct for denitration.

The SCR denitration process system includes ammonia area, denitration area and catalyst, and other parts.

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