Flue gas monitoring system

The invention provides a flue gas monitoring system, and relates to the technical field of environmental protection. Comprising a mixing channel, a mixing bin, a reaction device and a sulfate radical monitoring device, the mixing channel comprises a sampling opening, flue gas enters the mixing channel through the sampling opening, an ozone supply device is installed in the mixing channel and used for outputting ozone, the gas outlet end of the mixing channel is connected with a gas inlet of the mixing bin, the mixing bin is gradually enlarged from the gas inlet to the inner space, and a gas outlet of the mixing bin is connected with one end of a gas guide pipe; the other end of the gas guide pipe is led into the reaction device, alkali liquor is contained in the reaction device and used for absorbing sulfur oxides in gas, and the sulfate radical monitoring device is communicated with the reaction device and used for monitoring the content of sulfate radicals in the reaction device. The device can monitor the