After the mobile sludge treatment device reduces the production of oily sludge, the mud cake is pretreated by sieving, transported by a screw conveyor, and sent to the pyrolysis dry distillation furnace for evaporation separation from the feed hopper. The pyrolysis dry distillation furnace is a The rotary rotary kiln has a hot air passage outside, and the high temperature hot air in the passage provides heat for the sludge to evaporate. The hot air passage is connected to the burner, and the burner is burned inside the combustion chamber. The oily sludge is moved from one end to the other under the action of continuously turning in the dry distillation furnace to complete the heating process. During the heating process, the volatile organic matter in the material is volatilized by heat to form an oil and gas mixture, which is discharged into the condensation chamber from the tail portion of the dry distillation furnace, and the solid dry residue material that has reached the standard after evaporation is discharged from the lower end of the tailing of the dry distillation furnace.
The oil and gas condensation recovery unit is mainly carried out in the spray tower. In the spray tower, the oil and gas mixture is in direct contact with the sprayed low-temperature condensate, and the majority of the oil and gas is condensed. The formed oil-water mixture is discharged into the subsequent oil-water separation unit, and a small amount of non-condensable gas is sprayed into the burner as a combustion-supporting gas by the spray washing gas to reduce the amount of natural gas, thereby reducing part of the running cost. In the oil-water separation unit, the oil is dewatered by the first grade sloping plate, the second-stage condensate filter is degreased, and the oil is floated and degreased. The oil content in the water drops below 10 ppm. After the deoiled water is cooled by the air cooler, it is circulated into the spray tower for spraying, and the light oil separated from the unit is stored in a recovery tank. A small amount of water is generated during the oil-water separation process, and is used as humidifying water after microfiltration according to requirements, and is used for humidifying and cooling the solid discharge or discharging the heavy metal to be harmlessly treated, and the whole process has no external sewage.