SCR denitration system

The invention relates to the technical field of SCR denitration, and discloses an SCR denitration system. The system comprises a heat storage unit, an economizer, a high-pressure heater and an SCR denitration device. The economizer is arranged in a flue, a bypass flue gas outlet of the flue is communicated with a flue gas inlet of a bypass flue, and a flue gas outlet of the bypass flue is connected with the SCR denitration device; a heat exchange pipe is arranged in the bypass flue; the heat storage unit is respectively connected with the high-pressure heater and the heat exchange tube; according to the SCR denitration system, the flue gas to be treated can be heated, denitration treatment on the low-temperature flue gas is achieved, and the purpose of ensuring normal operation of the SCR denitration device when a boiler is ignited is achieved. 本发明涉及SCR脱硝技术领域，公开了一种SCR脱硝系统。所述系统包括储热单元、省煤器、高压加热器和SCR脱硝装置；所述省煤器设置于烟道内，所述烟道的旁路烟气出口与旁路烟道的烟气入口连通，所述旁路烟道的烟气出口与所述SCR脱硝装置连接；所述旁路烟道内设有换热管；所述储热单元分别与所述高压加热器和所述换热管连接；本发明所述的SCR脱硝系