Device for preparing sulfuric acid by dry method

The utility model discloses a device for preparing sulfuric acid by a dry method and belongs to the technical field of sulfuric acid. According to the dry sulfuric acid preparation device, a combustion furnace is connected with a heating medium inlet of a first heat exchanger, a heating medium outlet of the first heat exchanger is connected with a first cooling assembly, the first cooling assemblyis connected with a drying assembly, the drying assembly is connected with a refrigerant inlet of the first heat exchanger, and a refrigerant outlet of the first heat exchanger is connected with a first reaction bed layer; wherein the first reaction bed layer is connected with the first cooling device, the first cooling device is connected with the second reaction bed layer, the second reaction bed layer is connected with the second cooling device, the second cooling device is connected with the third reaction bed layer, the third reaction bed layer is connected with the third cooling device,the third cooling device