In the pyrolysis treatment process of landed oil sludge, the pretreatment stage is of vital importance, as it directly determines the efficiency, 

stability, product quality and equipment lifespan of the pyrolysis. The core objective of pretreatment is to transform the complex and 

diverse oil sludge into homogeneous materials suitable for feed in pyrolysis reactors.

The following is the specific equipment selection for the pretreatment stage and the description of the best treatment effect

I. Main Objectives of the Pretreatment Stage

Homogenization: To make the composition and particle size distribution of the oil sludge uniform.

2. Particle size control: Crush to a size suitable for the feed to the pyrolysis reactor (typically <50mm, ideally <10-20mm).

3. Moisture content regulation: Control the moisture content entering the furnace (the optimal range is usually 20%-30%. If it is too low, energy consumption will be high and coking is likely to occur; if it is too high, thermal efficiency will be reduced and the moisture content of oil and gas will increase).

4. Impurity removal: Separate large pieces of metal, stones, fibers, plastics and other inorganic impurities as well as refractory organic substances as much as possible.

5. Improved fluidity: Ensure that the materials can be stably and continuously conveyed to the pyrolysis reactor.

The success of pretreatment lays a solid foundation for the efficient, stable and long-term operation of the subsequent pyrolysis reaction as well as the acquisition of high-quality products. Equipment selection must be closely combined with the characteristics of oil sludge and process requirements, and continuously optimized and adjusted in actual operation. The investment and operation costs of the pretreatment stage usually account for a considerable proportion of the entire pyrolysis project, but its significance to the overall process success cannot be overemphasized.