I. Working Principle

Atmosphere Control: Maintains an inert atmosphere (N2/Ar) or micro-negative pressure hypoxia to prevent oxidation and combustion.

Temperature Regime: Precise control at 450–700°C causes resin matrices (e.g., epoxy) to undergo pyrolysis, decomposing into small-molecule hydrocarbons, pyrolysis oil, and combustible gases.

Process Loop:

Pre-treatment: Shredding → Cleaning → Drying.

Pyrolysis: Oxygen-free cracking at 600–700°C for resin vaporization.

Post-treatment: Low-temp oxidation for residual carbon removal → Surface modification → Recycled Carbon Fiber (rCF).

Environmental Treatment: Condensation/recovery of oil; combustion of non-condensable gases.

II. Core Structure

Furnace System: High-temp stainless steel/refractory lining; horizontal/vertical; continuous (mainstream) or batch.

Heating System:

Resistance: Mature and precise.

Microwave: High efficiency and energy-saving (emerging).

Zoned Control: Preheating → Pyrolysis → Soaking (temp deviation ±5°C). Atmosphere & Vacuum: N2/Ar supply; online O2 monitoring (<1%); vacuum exhaust.

Feeding: Mesh belt/roller/cart systems for wind blades or scraps.

Exhaust Unit: Condensers for oil; Secondary Combustion Chamber (>850°C) for VOCs/CO/HCN compliance.

III. Key Parameters (Typical)

表格

Parameter Value

Operating Temp 450–700°C (600–650°C common)

Oxygen Content ≤0.5%–1% (Inert)

Capacity 500–3000 t/a (per furnace)

Recovery Rate ≥70%–85%

Strength Retention ≥80%–90% (vs. Virgin)

Energy Consumption ≤600 kWh/t (Microwave)

IV. Technical Advantages

Property Retention: Oxygen-free pyrolysis preserves fiber integrity better than chemical methods.

Scalability: Continuous lines handle up to 2500 t/a with controlled costs.

Green: No acid/alkali waste; compliant emissions; oil resource recovery.

Versatility: Suitable for wind blades, aerospace scraps, and automotive CFRP.

V. Mainstream Types

Continuous Oxygen-Controlled Furnace: Horizontal belt for large-scale wind/auto scraps.

Microwave Pyrolysis Furnace: Fast, uniform heating for high-value waste.

Batch Vacuum Furnace: Precise control for R&D or small-batch high-end recycling.

VI. Application Scenarios

Wind Power: Recycled fibers for concrete reinforcement or new blade cores.

Aerospace: Recycling CFRP scraps for non-structural components.

Automotive: Handling production offcuts and End-of-Life (ELV) parts.

VII. Industry Trends

Upscaling & Intelligence: 3000 t/a+ capacity with AI-driven adaptive O2 control.

Hybrid Heating: Combining microwave and resistance to cut energy by 30%+.

Closed-loop: Fuel recovery from oil and narrowing the gap between rCF and virgin fiber performance.