Vertical steam generator applied to concentrated sulfuric acid low-temperature waste heat recovery process

The invention provides a vertical steam generator applied to a concentrated sulfuric acid low-temperature waste heat recovery process, and belongs to the technical field of concentrated sulfuric acid waste heat utilization equipment. The device comprises a shell, an anodic protection device arranged in the shell, a natural circulation device arranged in the shell and a device used for applying current to the anodic protection device so that a stable passivation film can be formed on the surface of equipment making contact with sulfuric acid, the concentration of the sulfuric acid can fluctuate within the range larger than or equal to 98.5%, and the device is used under the working condition that the temperature of the sulfuric acid ranges from 150 DEG C to 230 DEG C. According to the invention, a stable passivation film is formed through anodic protection by the potentiostat, corrosion of sulfuric acid with reduced concentration at high temperature to equipment is prevented, a remarkable corrosion-resistant e