The utility model discloses an
ammonia-free denitration
system modified based on an SCR (
Selective Catalytic Reduction)
system, which comprises a denitration
tower in the original SCR
system, a
smoke inlet is arranged at the upper part of the denitration
tower, a
smoke outlet is arranged at the lower part of the denitration
tower, a placing space for placing a catalyst is arranged in the denitration tower, and the
ammonia-free denitration system further comprises a bearing
monomer for containing an
ammonia-free denitration agent, each bearing single body comprises a single body
enclosure structure and a porous bottom plate, the upper end of each single body
enclosure structure is open, the lower end of each single body
enclosure structure is connected with the porous bottom plate, the single body enclosure structures and the porous bottom plate define a containing space used for containing the ammonia-free denitration agent, a plurality of
flue gas flow guide holes are formed in the porous bottom plate, and the
flue gas flow guide holes are arranged in the mode that the ammonia-free denitration agent of the minimum unit cannot penetrate through the
flue gas flow guide holes; the plurality of bearing monomers are detachably distributed in the placing space, and the bearing monomers are fully distributed on the transverse section of the denitration tower, so that
flue gas entering from the
flue gas inlet at least penetrates through one bearing
monomer and then flows out from the
flue gas outlet. According to the utility model, the one-time investment is lowest, the construction of a reconstruction site can be quickly completed, and the production continuity is hardly influenced.