过程

Drying Stage: From ignition to the furnace temperature reaching 160°C, the moisture content in the briquettes relies mainly on external heating and heat generated from their own combustion for evaporation. The chemical composition of the briquettes remains largely unchanged during this stage.

Initial Carbonization Stage: This stage is driven primarily by the combustion of the briquettes themselves, raising the furnace temperature to between 160°C and 280°C. At this point, thermal decomposition reactions occur in the woody material, leading to changes in its composition. Unstable components such as hemicellulose undergo decomposition, producing substances like CO2, CO, and small amounts of acetic acid.

Full Carbonization Stage: This stage occurs within the temperature range of 300°C to 650°C.During this stage, the woody material undergoes rapid thermal decomposition, simultaneously generating significant amounts of liquid products such as acetic acid, methanol, and wood tar. Additionally, combustible gases like methane and ethylene are produced. These gases can be controlled and utilized through valves for cyclic combustion. The combined processes of thermal decomposition and gas combustion generate a substantial amount of heat, raising the furnace temperature. The woody material is distilled into charcoal under high temperatures.

生产高温木炭时，除了上述三个阶段外，还需要额外加热，将炉温进一步提高到 800°C 至 1000°C 左右。这有助于排出木炭中残留的挥发性物质，增加碳含量，强化木炭中的石墨结构，并提高其导电性。