Device and method for integrally removing dioxin, CO and nitrogen oxides in flue gas

The invention discloses a device and method for integrally removing dioxin, CO and nitrogen oxides in flue gas, which not only solves the problem of excessive emission of CO by utilizing the characteristics of the flue gas of a fluidized bed garbage incinerator and taking residual CO in the flue gas as an energy source for maintaining the temperature of an SCR reactor subsequently, but also provides a heat source for the reactor and saves energy. The device and method solves the problem that the emission of the flue gas dioxin of the fluidized bed garbage incinerator exceeds the standard and removes a large amount of NOx at the same time. The device and method solves the problem that CO and dioxin in the flue gas of the fluidized bed incinerator cannot meet the emission requirement of GB18485-2014, and simultaneously can greatly reduce the emission concentration of NOx. In the device, all the equipment is arranged at the rear end of the original flue gas purification, so that the influence on the original sys