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Carbonization Stages in High-Temperature Sintering Furnaces
- Drying Stage
- Temperature: 120–150°C
- The pyrolysis rate is very slow. Moisture in the wood evaporates using external heat, while the chemical composition of the wood remains almost unchanged.
- Pre-Carbonization Stage
- Temperature: 150–275°C
- Pyrolysis reactions begin to occur more noticeably. Unstable components, such as hemicellulose, decompose into carbon dioxide, carbon monoxide, and small amounts of acetic acid and other substances.
- Carbonization Stage
- Temperature: 275–400°C
- Wood undergoes rapid thermal decomposition, producing large amounts of decomposition products. Liquid products contain significant acetic acid, alcohols, and wood tar. Gas products see decreasing CO₂ and H₂O but increasing combustible gases such as methane and ethylene. This stage releases substantial reaction heat, hence also called the exothermic reaction stage.
- Calcination Stage
- Temperature: 450–500°C
- External heat drives the calcination of charcoal, expelling residual volatile substances and increasing fixed carbon content. Liquid by-products become minimal at this stage.
- Carbon Refining Stage
- Temperature: 500–1200°C
- This is the key stage, where the final carbon content is stabilized, ensuring high-quality charcoal.
Market Overview of High-Temperature Sintering Furnaces
- In recent years, the high-temperature sintering furnace market has developed rapidly, driven by massive demand.
- The market has become highly competitive, with various furnace products differentiated by specifications, types, and functions. Competition exists not only between products but also between manufacturers.
- To improve market competitiveness, furnace manufacturers must continuously introduce advanced production equipment and technology, enhance product quality, and scale up production to better meet market demand.
- High-temperature sintering furnaces must achieve smokeless and environmentally friendly carbonization to gain market acceptance. This capability has been widely recognized by users, making eco-friendly furnaces highly favored in the market.
