Flue gas desulfurization and denitrification system

The invention provides a flue gas desulfurization and denitrification system, and relates to the technical field of environmental protection. Comprising a first flue gas channel, a temperature increasing channel, a denitration reactor and a desulfurization reactor, wherein the denitration reactor is used for carrying out denitration treatment on passing flue gas, and the desulfurization reactor is used for carrying out desulfurization treatment on passing flue gas; an impeller is arranged at one end of the first flue gas channel, a first connector and a second connector are arranged at the two ends of the temperature increasing channel respectively, the temperature increasing channel is communicated with the first flue gas channel through the first connector, and the first connector is arranged in the radial direction of the impeller, so that flue gas pressurized and accelerated by the impeller enters the temperature increasing channel through the first connector; the temperature increasing channel is connect