Special-shaped refractory brick structure for reducing material temperature difference of preheating zone of rotary kiln

The utility model discloses a special-shaped refractory brick structure for reducing the material temperature difference of a preheating zone of a rotary kiln, which belongs to the technical field of refractory bricks and comprises a refractory brick, bumps and positioning grooves, and the bumps are fixedly mounted at two ends of the front surface and the back surface of the refractory brick; the width of each protruding block is 0.5 mm. The positioning grooves are located in the surfaces of the tops and the bottoms of the refractory bricks. By arranging the refractory bricks, the convex blocks, the positioning grooves and other parts, the two adjacent refractory bricks can be conveniently positioned and fixed, and therefore when the refractory bricks are used, the refractory bricks are prevented from falling off, and unnecessary losses are reduced; the arc-shaped groove, the first fireproof layer, the second fireproof layer, the positioning groove, the anti-corrosion layer, the heat preservation layer and ot