Kiln low-temperature flue gas ammonia-free denitration synergistic desulfurization system

The invention discloses a kiln low-temperature flue gas ammonia-free denitration synergistic desulfurization system which comprises a dust removal device, a desulfurization and denitration absorption tower and a denitration agent spraying unit, flue gas passes through the dust removal device and then is connected to the desulfurization and denitration absorption tower through an induced draft fan, and the denitration agent spraying unit is arranged between the induced draft fan and the desulfurization and denitration absorption tower. The denitration agent spraying unit comprises a data processing evaluation part, a dynamic control part and a spraying part, the dynamic control part comprises a plurality of flue gas detection sensor groups, the flue gas detection sensor groups are arranged at the downstream of a spray gun of the spraying part in a flue, and the spray gun is arranged in the flue in a peak shifting crossed rotary spraying mode; the spraying part is connected with a denitration agent; the desulfu