Boiler low temperature waste heat from flue gas recovery unit

The utility model discloses a boiler low temperature waste heat from flue gas recovery unit, include to set gradually dust remover, desulfurizing tower, draught fan and the chimney on the pipeline is discharged fume to the boiler, be provided with condensing flue gas economizer on the pipeline of discharging fume between dust remover and the desulfurizing tower, condensing flue gas economizer includes heat exchange tube, water spray towards grey device and acid cure knot liquid collection device, acid cure knot liquid is collected the device lower part and is provided with sour neutralization pond. The heat exchange tube with set up the low temperature air heater formation heat exchange circulation pipeline on boiler air-supply line way, set up the circulating pump on this pipeline. The utility model discloses the exhaust gas temperature that can make boiler tail gas drops to below 80 DEG cs by 130-200 DEG cs, can make boiler efficiency improve 6-10%, simultaneously because used low-priced lime stone and water come as the desulfurizer in with condensation heat transfer in collected-85% acid cure ties liquid, greatly reduced the desulfurization cost.