Abstract: The evaluation on the denitration system performance is helpful for the system lifetime management and secure operation. Taking the SCR flue gas denitration system of the 600-MW generation unit in a thermal power plant for example, the evaluation procedures and methodologies are described. By testing the basic parameters of the SCR system, such as the denitration efficiency, the reaction temperature, the conversion from SO2 to SO3, the NH3 leakage, the pressure drop, the flue gas velocity in the catalyst and the fly ash concentration, the performance of the SCR system of the generation unit is obtained, which demonstrates excellent performance of the system. At last, suggestions on operation tune-ups are put forward to prevent the rising SO2 to SO3 conversion rate under high temperatures and high flue gas flow rate in the catalyst at heavy loads.

Key words: coal-fired power plant, flue gas denitration, SCR, evaluation of SCR system performance