The invention relates to a method and a device for cooperatively enhancing PM2.5 (Particulate Matter 2.5) removal and
smoke afterheat deep utilization. The device is composed of a
smoke humidifying device, an electric dust remover, a low-temperature
coal economizer and a wet desulphurization
tower. The method comprises the following steps: before
smoke enters the electric dust remover, spraying atomized hot water to carry out humidifying and
tempering treatment; enhancing the PM2.5 capturing of the electric dust remover and improving the
moisture content of the smoke; providing the atomized hot water by the low-temperature
coal economizer; arranging the low-temperature
coal economizer between the electric dust remover and the desulphurization
tower to recycle the
sensible heat released by cooling the smoke to obtain the smoke with high
relative humidity; then adjusting an inlet gas-
liquid temperature difference and a desulphurization liquid-gas ratio of the subsequent wet desulphurization
tower to enable the smoke with the high
relative humidity in the desulphurization tower to be over-saturated in a desulphurization and washing process; and carrying out
nucleation condensation on over-saturated water steam on the surface of PM2.5 so as to enable the
granularity of the PM2.5 to grow and be captured. According to the method and the device, the capturing effect on the PM2.5 by the electric dust remover and a wet smoke desulphurization
system can be enhanced and the smoke afterheat can also be recycled.