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選擇性催化還原(SCR)技術是通過還原劑（如NH₃）在適當?shù)臏囟炔⒂写呋瘎┐嬖诘臈l件下，把氮氧化物（NOX）轉化為空氣中天然含有的氮氣和水，脫硝效率高達90%以上。由于SCR脫硝技術的成熟以及高的脫硝率，現(xiàn)已成為國際上煙氣脫硝的主流技術。

Selective catalytic reduction(SCR)technology IS to use the reducing agent(such as NH3)and catalyst to transfer NOX into the nitrogen and water naturally existing in the air at the appropriate temperature．The denox efficiency is above 90％．Because of mature SCR denox technology and high denox efficiency，SCR technology has become the main international technology for flue gas dpnox.

電廠應用原理: