Flue gas purification and recovery system

A gas-smoke retrieving system comprises a dust removing device, a purifying device and a dry absorption device which are sequentially connected by a gas-smoke pipeline. The purifying device comprises a systemic venture, a packed tower, an indirect gas cooler, a wet electrostatic precipitator and a dilute sulphuric acid recovery device, wherein the wet electrostatic precipitator comprises an electrical atomizing dilute sulphuric acid circulation groove, the dry absorption device comprises a drying tower, a first absorption tower and a second absorption tower, the dilute sulphuric acid recovery device comprises a dilute sulphuric acid pump, a plate and frame filter press and a dilute sulphuric acid storing tank, and a flow meter and a control valve are disposed at the outlet of the dilute sulphuric acid strong tank. The packed tower, the indirectly cooler and an acid return hose output of the wet electrostatic precipitator are arranged inside the electrical atomizing dilute sulphuric acid circulation groove, an