The invention relates to the technical field of boiler equipment, in particular to an ultra-low
smoke emission device for a large boiler. The boiler is installed on the support, a desulfurization
tower used for
flue gas desulfurization is further arranged on the support, and a denitration furnace, an oxidation absorption chamber and a pair of dust removal chambers are sequentially communicated between the boiler and the desulfurization
tower from left to right; the proportioning
assembly is arranged on the bracket and is used for fusing and proportioning the
urea solution; the spraying
assembly is arranged on the denitration furnace and used for spraying the
urea solution. According to the invention, a denitration mode combining SNCR and a low-temperature oxidation denitration process is adopted, and a plurality of links such as denitration, dust removal and desulfurization are integrated, so that
flue gas emission can reach an ultra-
low emission standard, the overall adaptability and
cost effectiveness of the device are remarkably improved, and moreover, the device is suitable for industrial production. According to the invention, by using the atomizing ejector in rotary spraying operation in the denitration process, not only is the denitration efficiency improved, but also an efficient and economical solution is provided for the field of
environmental protection.