Treatment method and device for pyrolyzing and incinerating sludge by utilizing household garbage incineration flue gas

The invention relates to a treatment method and device for pyrolyzing incinerated sludge by using household garbage incineration flue gas, wet sludge with the moisture content of about 80% is atomized and then is sprayed from the upper part of a first flue of a waste heat boiler, so that the atomized sludge is in contact with the high-temperature flue gas, the moisture is quickly evaporated, and drying is completed within an extremely short time; the dried sludge particles are subjected to pyrolysis gasification and combustion in different areas according to the size and weight of the sludge particles, most of burnt ash falls onto a fire grate and is discharged out of an incinerator along with slag, and a small part of ash deposits on a boiler heating surface and a flue or enters a flue gas purification system to form fly ash. Equipment such as drying equipment and a device for conveying dry powder sludge into a furnace does not need to be independently arranged, so that the investment cost is reduced; sludge