The invention provides a
flue gas desulfurization and dust-whitening integrated device, comprising a desulfurizing
tower, a whitening device communicated with a
flue gas outlet of the desulfurizing
tower, and a wet
electrostatic precipitator which is arranged on the top of the whitening device and is communicated with the whitening device, wherein the whitening device comprises a device shell fixedly arranged above the desulfurizing
tower, a water collector arranged in the device shell, and a spray device arranged above the water collector; a water collecting hole is formed in the device shell, and is communicated with a water collecting
pipe; the water collecting
pipe is communicated with a
water cooling tower by a water collecting pipeline; the
water cooling tower is communicated with a
sedimentation tank; the upper part of the
sedimentation tank is connected with a spray pipeline by a spray pump; the spray pipeline is communicated with the spray device; the bottom of the
sedimentation tank is connected with a desulfurization pulping
system by a
sewage pump. After the device is used, the aim of whitening
flue gas is achieved; spray water can be separately recycled, and water removed from the
flue gas can be also recycled so as to be used for the desulfurization pulping
system, so that the aim of saving water is achieved.