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SCR systems
Under the presence of a catalyst and at a reaction temperature of 300-450°C, ammonia (NH₃) or hydrocarbons react with NO or NO₂ to generate N₂ and H₂O. The denitrification efficiency exceeds 90%.
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Selective Catalytic Reduction (SCR)
Under the presence of a catalyst and at a reaction temperature of 300-450°C, ammonia (NH₃) or hydrocarbons react with NO or NO₂ to generate N₂ and H₂O. The denitrification efficiency exceeds 90%.
Main reducing agents: liquid ammonia, urea, and ammonia water. Trend: replacing liquid ammonia with urea.
Characteristics of SCR systems:
- Relatively complex in structure but convenient to operate;
- Few moving parts, resulting in high reliability;
- No by-products, but consumes catalyst;
- High denitrification efficiency, over 90%;
- High investment cost under special circumstances, such as:
- Low-temperature catalysts (150-280°C)
- High-temperature catalysts (≥450°C)
- Sulfur-resistant catalysts
- Wear-resistant catalysts
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SCR systems
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