Coal-fired unit coordination control system

The utility model relates to the technical field of thermal power plant denitration, in particular to a coal-fired unit coordination control system which comprises a denitration device and further comprises a gas outlet pipe, the gas outlet pipe is connected with a shell of the denitration device, an ammonia spraying pipeline and a mixer are arranged in the gas outlet pipe, a plurality of ammonia spraying openings are formed in the ammonia spraying pipeline, and the mixer is connected with the denitration device. The mixer is positioned above the ammonia spraying pipeline and is used for mixing flue gas and ammonia gas; one end of the communicating pipe is connected with the air outlet pipe, and the other end of the communicating pipe is connected with an air inlet pipe; the flow guide unit is mounted at the joint of the communicating pipe and the gas inlet pipe and is used for changing the flow field distribution of the flue gas; according to the present invention, the uniform mixing of ammonia gas and flue