Electric-bag composite dust collector for removing Hg and SO3 synergistically based on intermediate injection

The utility model provides an electric-bag composite dust collector for removing Hg and SO3 synergistically based on intermediate injection. Wherein the inlet sealing head, the electric area and the bag area are sequentially arranged in the smoke flowing direction. The inlet seal head is communicated with the electric area; a flow guide device and a dry powder spraying device are arranged in the flue between the electric area and the bag area; an airflow distribution box is arranged in the bag area; a plurality of ash buckets are arranged below the shell of the electric area and the bag area;a coarse ash output pipeline is arranged below an ash bucket of the first electric field of the electric area; a coarse ash collecting device is arranged at the output end of the coarse ash output pipeline; wherein the output end of the coarse ash collecting device is connected with the storage bin pump through the mechanical grinding and crushing device and the medicament adding and mixing devicein sequence, the output e