Category: Biochar making

How Indirect Fired Rotary Kiln Work To Make Biochar

December 13, 2023

Biochar making, Carbonization machine, Indirect-fired rotary kiln

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An indirect fired rotary kiln is a type of rotary kiln that does not come into direct contact with the material being processed. In the context of biochar production, an indirect-fired rotary kiln is used to convert biomass into biochar through a controlled, oxygen-limited pyrolysis process.

Here’s how an indirect fired rotary kiln for biochar making typically works:

Introduction of Biomass Feedstock:

Biomass feedstock, such as wood chips, crop residues, or other organic materials, is introduced into the rotary kiln.

Biomass to biochar production

Biomass to biochar production


The indirect fired rotary kiln is heated externally, usually using gas or oil burners, and the heat is transferred to the biomass within the kiln.
The pyrolysis process begins, where the biomass undergoes thermal decomposition in the absence of oxygen. This leads to the production of biochar, along with other byproducts such as gases and liquids. Click here to learn more.

Temperature Control:

The temperature inside the rotary kiln is carefully controlled to optimize the pyrolysis process. Typically, temperatures range from 400 to 700 degrees Celsius, depending on the desired properties of the biochar. Indirect-fired continuous carbonization machine adopts PLC control system, which can monitor and adjust the temperature in real time. So you can make high quality biochar.

Residence Time:

The biomass spends a specific amount of time in the rotary kiln, known as the residence time. This time is crucial for achieving the desired biochar characteristics. For this, continuous carbonization furnace can help you prepare biochar quickly.

Indirect-Fired Rotary Kiln for sale

Indirect-Fired Rotary Kiln for sale

Cooling and Collection:

After pyrolysis, the biochar is cooled to prevent further reactions. This can be done by passing it through a cooling system.
The biochar is then collected from the kiln for further processing or utilization.
The indirect fired continuous carbonization machine design is chosen for biochar production because it allows precise control over the pyrolysis process and helps in avoiding direct contact between the material and the combustion gases. This control is essential for producing high-quality biochar with specific properties, such as high carbon content, stability, and porosity.

The choice of materials for the rotary kiln, the heating method, and the control systems can vary based on the scale of production, the feedstock used, and other specific requirements. The goal is to create an efficient and environmentally friendly process for biochar production. If you are interested in it, you can visit to learn more details.

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