Circulating type desulfurization and dust removal system

The utility model discloses a circulating desulfurization and dust removal system which comprises a dust removal box, a desulfurization tower and a temperature adjusting mechanism, an air inlet pipe is arranged at an air inlet in the left end of the dust removal box, an air outlet pipe is arranged at an air outlet in the upper end of the dust removal box, and dust filter screens are arranged in the dust removal box from left to right; the desulfurization tower is located on the right side of the dust removal box, an air inlet of the desulfurization tower is communicated with the air outlet pipe, a heat circulating pipe is arranged in the middle of the top wall of the desulfurization tower, a flow guide spiral piece is arranged between the outer cambered surface of the heat circulating pipe and the inner cambered surface of the desulfurization tower, a reaction box is arranged in the middle of the inner cambered surface of the heat circulating pipe, and air holes are formed in the surface of the reaction box;