Carbonizer machine is the equipment for making charcoal from solid or organic matter. The whole charring process is going in the condition of isolation or lack of air. Materials pyrolysis into charcoal, smoke, tar, vinegar, etc.

Materials for carbonizing

Our carbonization furnaces are mainly used for making charcoal. The common materials for carbonizing are biomass, such as natural wood, timber, branch, bamboo, coconut shell, rice husk, palm shell, sawdust briquettes, etc.

biomass materials for carbonizing

Carbonization Process

The carbonization process can be roughly divided into the following five stages.

  1. Drying and dehumidifying stage

The temperature at this stage is 120-150 ℃, and the pyrolysis rate is very slow. The moisture in the wood relies on external heat to evaporate, and the chemical composition of the wood material hardly changes.

  1. Pre-carbonization stage

The temperature at this stage is 150-280 ℃. The pyrolysis reaction of wood materials is obvious, and the chemical composition of wood materials begins to change. Among them, unstable components such as hemicellulose pyrolysis generate carbon dioxide, carbon monoxide, and a small amount of acetic acid.

The above two stages require an external heat supply to ensure the rise of pyrolysis temperature, so it is also called the endothermic decomposition stage.

carbonization temperature trend chart
  1. Carbonization stage

The temperature in this stage is 280-400 ℃. In this stage, the wood material accelerates pyrolysis and generates a large number of decomposition products. The produced liquid product contains a large amount of acetic acid, methanol, and wood tar. The carbon dioxide content in the produced gas product gradually decreases, while the flammable gases such as methane and ethylene gradually increase.

This stage emits a lot of reaction heat, so it is also called the exothermic reaction stage.

combustible gas burning for heating carbonizer machine
  1. Calcination stage

The temperature rises to 400-600 ℃. At this stage, the charcoal is calcined to discharge the volatile substances remaining in the charcoal and increase the fixed carbon content of the charcoal.

At this time, very little liquid product is produced.

  1. Cooling after carbonization

The charcoal can only be discharged when the temperature drops to below 50 ℃, otherwise, the charcoal will reignite.

The above five stages roughly describe the whole process of carbonization. For different types of carbonizer machines, different materials, there are many differences in operation and temperature changes.
Please read the below introduction pages for each type of furnace or consult us for more details.

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