Soil pyrolysis treatment method and device based on direct pyrolysis desorption

The invention belongs to the technical field of regeneration of polluted soil, and particularly to a soil pyrolysis treatment method and device based on direct pyrolysis desorption. The soil pyrolysistreatment method based on direct pyrolysis desorption comprises the steps of soil pretreatment, soil pyrolysis desorption in a direct pyrolysis desorption furnace and pyrolysis flue gas treatment inthe direct pyrolysis desorption furnace, the pyrolysis flue gas treatment of the direct thermal desorption furnace specifically includes the steps that (1) the pyrolysis flue gas of the direct pyrolysis desorption furnace is separated to obtain high-temperature smoke dust and soil pyrolysis gas; (2) the high-temperature smoke dust is mixed with the pretreated soil and then introduced into an indirect pyrolysis desorption furnace for pyrolysis desorption; and (3) pyrolysis desorption gas produced by the indirect pyrolysis desorption furnace is exported, and the treated soil is discharged from the indirect pyrolysis deso