Frequency-modulation intelligent ammonia control system and method

The invention discloses a frequency-modulation intelligent ammonia control system and method. The frequency-modulation intelligent ammonia control system comprises an ammonia spraying mother tube, wherein the ammonia spraying mother tube is connected with an ammonia spraying branch tube group which comprises at least eight ammonia spraying branch tubes; a catalyst layer is arranged below the ammonia spraying branch tube group; a partitioned measurement position is arranged below the catalyst layer; a partitioned measurement point group is arranged inside the partitioned measurement position; the partitioned measurement point group comprises four partitioned measurement points; the partitioned measurement point group is connected with a measurement instrument. The frequency-modulation intelligent ammonia control system has the beneficial effects that the design is reasonable, unevenness of an ammonia spraying area and the failure area of a catalyst can be found in time, the maximizationof an ammonia use ratio