超低排放形势下SCR脱硝工程改造现状的调查

为达到“煤电节能减排升级与改造行动计划（2014—2020年）”要求，超低排放改造工作在燃煤电厂全面展开。对49个电厂已完成烟气超低排放改造的132台机组安装的SCR脱硝催化剂现状进行了调查，对脱硝机组的类型、烟气温度、入口粉尘浓度、入口NO_x浓度和超低排放要求下脱硝催化剂的改造方案进行了统计和分析，并对超低排放改造前后SCR脱硝催化剂不同催化剂层间体积的变化进行了比较，同时结合部分改造案例分析了超低排放改造设计过程中值得注意和改进的事项，以进一步保障脱硝系统的达标排放和安全经济运行，给后续开展烟气脱硝超低排放改造机组的设计和建设提供借鉴。

Investigation on the Status of the Reconstructive Projects for SCR De-NOx Under the Condition of Ultra-low Emission

In order to meet the requirements of the Plan of Action for Energy-saving and Emission-reduction upgrading and Reconstruction of Coal and Power plants (2014-2020), reconstructive projects of ultra-low emissions have been carried out in many coal-fired power plants. To provide reference for the design and construction of flue gas denitration for ultra-low emission units, investigation on the catalyst status is conducted for 132 units in 49 power plants whose flue gas denitration ultra low emission retrofits had been completed. The unit type, flue gas temperature, inlet dust concentration, inlet NO_x concentration and modification of catalysts are analyzed. The catalyst volumes before and after the ultra-low emission retrofit are compared. At the same time, some proposals based on case analysis are given to guarantee the security and economical operation and the standardized NO_x emission.