某电厂600 MW机组烟气脱硝系统性能评价

对烟气脱硝系统进行性能评价，有助于脱硝系统寿命管理和安全运行。以某火电厂600 MW机组选择性催化还原（SCR）烟气脱硝系统为例，介绍了烟气脱硝系统的评价过程与评价方法。通过测试一系列基础参数，包括脱硝效率、反应温度、SO2/SO3转化率、氨逃逸率、催化剂压降、催化剂内烟气流速及飞灰浓度等，掌握了此台机组脱硝系统的主要性能。试验结果表明，该SCR脱硝系统性能良好。为防止高温下SO2/SO3转化率升高及高负荷下催化剂内烟气流速过高，对该脱硝系统的运行调整提出了建议。

Evaluation of SCR System Performance for the 600-MW Generation Unit of a Power Plant

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.