Low-temperature waste heat recovery system of smelting flue gas acid-making system

The invention provides a low-temperature waste heat recovery system of a smelting flue gas acid-making system. The low-temperature waste heat recovery system of the smelting flue gas acid-making system is applied to a drying tower, a first absorption tower and a second absorption tower of a dry absorption working section in the smelting flue gas acid-making system. The low-temperature waste heat recovery system of the smelting flue gas acid-making system comprises a working medium heat exchanger, a turbine generator, a condenser, a liquid storage tank and a working medium pump, wherein the working medium heat exchanger is arranged in an acid circulation system of the drying tower, the first absorption tower and the second absorption tower; the turbine generator, the condenser, the liquid storage tank and the working medium pump sequentially communicate with the working medium heat exchanger through a pipeline, and an organic working medium is stored in the liquid storage tank; one end of the working medium pu