Practical Tips for Waste Tire Pyrolysis Oil Production

Practical Tips for Waste Tire Pyrolysis Oil Production

The key to waste tire pyrolysis lies in raw material pretreatment, precise temperature control, efficient condensation, sealed negative pressure operation, safe slag discharge and tail gas reuse. These factors directly determine oil yield, oil quality and production safety. Below are practical operational tips by process:

1. Raw Material Pretreatment – First Step to Boost Efficiency

• Prioritize high-quality materials: Choose steel radial tires and engineering tires (high rubber content); avoid severely aged tires or those contaminated with sludge or impurities.

• Crushing & impurity removal: Cut tires into 2–5 cm pieces and completely remove steel wires; sieve after crushing to control impurities below 2%.

• Drying control: Fully air-dry or dry raw materials to avoid moisture, which prevents water from diluting pyrolysis oil and prolonging reaction time.

• Particle size optimization: Use small pieces for batch pyrolysis; grind into 2–5 mm rubber powder for continuous pyrolysis to increase heating area and shorten reaction cycle.

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2. Pyrolysis Temperature Control – Critical for Oil Yield & Quality

• Temperature ranges:

• 280–320°C: Initial pyrolysis and gas generation

• 400–450°C: Main pyrolysis completion (total duration: 8–12 hours)

• Temperature control principles:

• Heat up steadily and slowly; avoid rapid high-temperature heating. Excessively high temperature causes carbonization and insufficient oil condensation; low temperature leads to incomplete pyrolysis and high oil content in carbon black.

• Control furnace temperature fluctuation within ±10°C, and pressure ≤ 0.05MPa (slight positive pressure).

• During main furnace heating, the feeding screw shall only run forward, no reverse operation allowed.

  
  

3. Condensation System – Core for Maximizing Oil Output

• Cooling water control: Keep circulating cooling water temperature ≤40°C; use cooling towers or expand water tanks when water temperature rises to ensure condensation efficiency.

• Negative pressure extraction: Activate negative pressure device in the late pyrolysis stage to extract residual oil and gas for condensation, improving total oil yield.

• Oil-water separation: Pass condensed oil through an oil-water separator to remove moisture and enhance oil purity and calorific value.

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4. Sealing & Negative Pressure – Prevent Leakage & Ensure Safety

• Full-process sealing: Strictly seal feeding port, slag discharge port and pipeline flanges to avoid oil-gas leakage and maintain furnace pressure.

• Water seal for backfire prevention: Maintain normal water level in tail gas water seal tank to prevent flame backflow from combustion chamber to main furnace.

• Pressure monitoring: Monitor pressure gauge in real time; open pressure relief valve immediately for overpressure and safely discharge through tail gas system.

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5. Slag Discharge & Safety – Eliminate Flash Explosion

• Cooling before slag discharge:

• Batch type: Open furnace door only after furnace temperature drops below 80°C to prevent air ingress and flash explosion.

• Continuous type: Adopt water-cooled screw slag discharge with discharge temperature ≤60°C, fully sealed, dust-free and safe.

• Steel wire recovery: Separate steel wires from slag with a magnetic separator to increase added value.

• Safety bottom lines:

• Install combustible gas alarms in the workshop (alarm value: 25% LEL), and use anti-static flooring.

• Keep no personnel or materials in front of explosion-proof ports; do not open furnace door immediately if induced draft fan stops due to power failure.

• Cut off power, hang warning signs and ventilate before maintenance; use explosion-proof tools.

  
  

6. Tail Gas Reuse – Cost Reduction & Environmental Compliance

• Recyclable gas reuse: Non-condensable tail gas is treated by water seal + alkaline desulfurization and recycled to combustion chamber as fuel, saving 40–55% of fuel cost.

• Flue gas purification: Equip with desulfurization, denitrification and pulse dust removal systems to meet emission standards (particulate matter ≤30mg/m³, SO₂ ≤100mg/m³).

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7. Equipment Maintenance – Guarantee Stable Operation

• Check pressure gauges, thermometers and safety valves daily, and calibrate regularly.

• Clean condensers and pipelines weekly to prevent tar blockage.

• Inspect seals, screws and burners monthly, and replace wearing parts in time.

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