How to Refine Oil Sludge 

Core Principle

The process adopts oxygen-free closed thermal cracking. Organic components in oil sludge are decomposed at high temperatures into fuel oil, combustible gas, and carbon black/residue, realizing resource recovery and harmless treatment of oil sludge.

Complete Process Flow (Single cycle: approx. 24 hours)

1. Raw Material Pretreatment & Feeding (1–2 hours)

• Pretreatment: Dehydrate and remove impurities (sand, metal) from oil sludge, crush to uniform particle size to improve cracking efficiency.

• Feeding: Transfer pretreated oil sludge into horizontal pyrolysis reactor manually or via screw conveyor, with filling ratio of 70%–80% of reactor volume.

• Close the reactor door and perform nitrogen purging to eliminate air inside, preventing explosion and oxidation.

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2. Heating & Cracking (6–8 hours, core stage)

• Low-temperature dehydration (<150℃): Heat gently to evaporate free water and small amount of light oil. Condense and separate wastewater for treatment.

• Medium-temperature cracking (180–350℃): Oil and gas start to generate at 180℃, with massive output at 240–260℃.

• High-temperature deep cracking (400–550℃): Maintain for 1–2 hours to fully decompose colloid and asphaltene until oil-gas output decreases obviously.

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3. Oil-Gas Condensation & Separation (Throughout heating)

• Primary cooling (tube condenser): 400–500℃ oil-gas → cooled to 100–150℃, separating heavy fuel oil.

• Secondary cooling (condensation tower): Oil-gas → cooled to 30–50℃, condensing light oil and water.

• Oil-water separator: Upper layer: fuel oil; lower layer: oily wastewater.

• Non-condensable gas recovery: Combustible gases (CH₄, C₂H₆, etc.) are stored in gas holder and recycled as fuel for reactor heating to reduce energy consumption. Excess gas is burned for emission.

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4. Cooling & Discharging Residue (12–14 hours)

• Cool naturally to below 80℃ (about 12 hours) before opening the reactor door.

• Discharge solid residue (sand, carbon black, metal oxides). Residue oil content < 2%, suitable for landfill, building materials filler, etc.

• Clean residue and restart feeding for next cycle.

Key Equipment & Parameters (LIFILTER Batch Type)

• Type: Horizontal rotary batch pyrolysis reactor

• Daily capacity: 10T, 12T, 15T per batch

• Cracking temperature: 400–550℃

• Single cycle: ~24 hours

• Yield: Fuel oil 30%–50%, combustible gas 10%–15%, residue 30%–40%

• Environmental system: Desulfurization, denitrification, dust removal, up-to-standard emission

Products & Applications

• Fuel oil: Used for industrial boilers, kilns, or refined into non-standard diesel.

• Combustible gas: Recycled for heating, energy-saving.

• Carbon residue: Roadbed material, building filler, safe landfill.

Safety & Environmental Protection

• Operate under closed micro-negative pressure to avoid leakage and air intake.

• Strictly control heating rate and temperature to prevent overheating, coking or bumping.

• Equip complete treatment for oily wastewater, waste gas and residue to meet hazardous waste and emission standards.

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