### 1. Selective catalytic reduction (SCR)
SCR is an efficient denitration technology. Under the action of catalyst, reducing agent (such as ammonia or urea) reacts with nitrogen oxides to generate harmless nitrogen and water.
-* * Advantages * *: High denitration efficiency (up to more than 90%), suitable for various fuels.
-* * Disadvantages * *: The equipment is complicated, the cost is high, and the catalyst needs maintenance.
### 2. selective non-catalytic reduction (SNCR)
SNCR does not need a catalyst, but directly injects a reducing agent into high-temperature flue gas to react with nitrogen oxides to generate nitrogen and water.
-* * Advantages * *: Simple process, low investment and operation cost.
-* * Disadvantages * *: Denitrification efficiency is relatively low (40%-70%), which is greatly affected by flue gas temperature.
### 3. Low temperature plasma technology
Nitrogen oxides are reduced by high-energy electrons and active substances generated by low-temperature plasma.
-* * Advantages * *: It can be operated at a lower temperature and has little corrosion to equipment.
-* * Disadvantages * *: High equipment and operation cost and complicated technology.
### 4. Wet nitrogen removal
The liquid containing reducing agent is sprayed into the flue gas through the washing tower to react with nitrogen oxides.
-* * Advantages * *: Desulfurization and denitrification can be carried out at the same time, which is suitable for treating a large amount of flue gas.
-* * Disadvantages * *: The generated wastewater needs to be treated, and the denitrification efficiency is limited.
### 5. Adsorption method
Use adsorbents such as activated carbon or molecular sieve to adsorb nitrogen oxides in flue gas.
-* * Advantages * *: Simple operation, capable of treating low-concentration nitrogen oxides.
-* * Disadvantages * *: The adsorbent needs to be replaced or regenerated regularly, and the cost is high.
### 6. Pulse discharge technology
Nitrogen oxides are decomposed by free radicals and active substances produced by high voltage pulse discharge.
-* * Advantages * *: No secondary pollution, suitable for high-concentration nitrogen oxides.
-* * Disadvantages * *: Complex equipment and high energy consumption.
Choosing a suitable denitration process needs to consider specific factors such as flue gas composition, treatment capacity, equipment investment and operating cost. According to the needs and conditions of all aspects, the most suitable denitration process is selected to achieve the best denitration effect.