Evaluation on Ultra-Low Emission Performance of SCR Flue Gas Denitrification Device for 300-MW Class Coal-Fired Units

The evaluation and analysis on the ultra-low emission performance of SCR denitrification device can provide reference and guideline for its stable, efficient and economic operation. Taking the SCR denitrification device of three 300 MW coal-fired units with ultra-low emissions for example, the operation parameters are evaluated, such as the denitrification efficiency, the inlet/outlet NO_x concentration distribution, the outlet flue gas velocity distribution, the ammonia escape rate, the conversion rate of SO₂ into SO₃, and the system resistance. Thusthe major properties of the device are obtained. The test results show that the overall performance of the device is good, but there still exist some problems such as flow field imbalance, fly ash clogging and excess ammonia escape. Therefore, the methods and recommendations are proposed to solve such problems.