Vertical type four-return trip heat carrier boiler

The utility model relates to a heat carrier boiler, in particular to a vertical type four-return trip heat carrier boiler which belongs to the technical field of boilers and comprises a cylinder (1). An inner layer boiler tube (2), a middle layer boiler tube (3) and an outer layer boiler tube (4) are arranged in the cylinder (1), a reflecting vault (5) is arranged among the cylinder (1) and the bottoms of the inner layer boiler tube (2), the middle layer boiler tube (3) and the outer layer boiler tube (4), a smoke channel is formed by distancing the middle section of the inner layer boiler tube (2), the lower section of the middle layer boiler tube (3) and the upper section of the outer layer boiler tube (4). As the reflecting vault is arranged between the bottoms of the three layers of boiler tubes and the cylinder, and the smoke channel is formed by distancing the middle section of the inner layer boiler tube, the lower section of the middle layer boiler tube and the upper section of the outer layer boiler