The program of charcoal charcoal in the first special Hongfa earth kiln
ZHITONG PIPE VALVE TECHNOLOGY CO.,LTD , https://www.ztongvalve.com
First, the drying stage. During this phase, the temperature ranges between 120-150 degrees Celsius. The pyrolysis process is very slow at this point, as the main focus is on removing moisture from the wood. This evaporation occurs due to external heat, and the chemical structure of the wood remains largely unchanged.
Second, the carbonization stage. As the temperature increases to 150-275 degrees Celsius, the wood starts to undergo more significant chemical changes. Volatile components such as hemicellulose begin to break down, producing gases like carbon dioxide, carbon monoxide, and small amounts of acetic acid. This stage marks the beginning of real thermal decomposition.
Third, the rapid carbonization stage. At temperatures between 275-400 degrees Celsius, the decomposition of wood accelerates rapidly. A large volume of byproducts is released, including liquid substances rich in acetic acid, alcohol, and other organic compounds. The gas produced becomes more abundant, with increasing water content and a reduction in methane. This stage is also known for its exothermic reactions, releasing significant heat.
Fourth, the calcination stage. When the temperature reaches 450-500 degrees Celsius, the charcoal is further processed. Any remaining volatile matter is driven off, which helps increase the fixed carbon content of the final product. At this point, the formation of liquid byproducts is minimal, and the material becomes more stable.
Fifth, the refining carbon stage. This is the most critical phase, where the temperature rises to between 500-1200 degrees Celsius. Here, the charcoal is refined to improve its quality, reducing impurities and enhancing its structural integrity. This stage determines the final properties of the charcoal, making it suitable for various applications.
Understanding these stages is essential for optimizing the charcoal production process. Each step plays a unique role in transforming raw wood into high-quality charcoal, ensuring efficiency and environmental sustainability.