Boiler smoke-exhaustion waste heat recycling system additionally provided with heat exchange elements

The invention discloses a boiler smoke-exhaustion waste heat recycling system. The boiler smoke-exhaustion waste heat recycling system comprises a low-temperature coal economizer, an inlet heat exchange assembly and an outlet heat exchange assembly, wherein the inlet heat exchange assembly is mounted between the low-temperature coal economizer and an inlet flue; the outlet heat exchange assembly is mounted between the low-temperature coal economizer and an outlet flue; and the inlet heat exchange assembly and the outlet heat exchange assembly are in the shapes of variable sections, and are distributed with a plurality of membrane type heat exchange elements on inner side walls. According to the boiler smoke-exhaustion waste heat recycling system, an inner working space is effectively utilized, the smoke gas side resistance of the low-temperature coal economizer is reduced, the heat exchange area is increased, and the system investment and the operation cost are reduced.