Forced circulation evaporation device used in concentrated sulfuric acid low-temperature waste heat recovery process

The invention provides a forced circulation evaporation device for a concentrated sulfuric acid low-temperature waste heat recovery process, and belongs to the technical field of concentrated sulfuric acid waste heat equipment utilization. The device comprises a potentiostat, a forced circulation heater and a flash tank, wherein the forced circulation heater and the flash tank are communicated; the flash tank is communicated with the forced circulation heater; a circulating pump is communicated between the inlet of the forced circulation heater and the outlet of the flash tank; an anode protection device is arranged in a shell of the forced circulation heater, and the constant potential rectifier is used for applying current to the anode protection device so that a stable passive film can be formed on the equipment surface in contact with sulfuric acid; the concentration of the sulfuric acid can fluctuate in a range of greater than or equal to 98.5%, and the method is used under the working condition that the