Our plant
for your organic residues

We develop and manage the entire construction project of the carbonisation plant and operate it after completion.

Our plant for your organic residues

A feasibility study is conducted before the construction process starts. Ideally, our plant can be fit in to existing structures at the production site. This allows to connect the streams of organic waste directly to the plant. The recycling process can thereby be integrated on site.

Process steam

Recycling green energy

Renewable energy is generated as a by-product of biochar. It can be fed into customers’ local production processes either as process steam or as cooling, heating or electricity.
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Coffee beans and biochar


The biochar obtained is always fully utilised. It can be used in the value chain as required. Alternatively, Circular Carbon can remarket the biochar products.
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Unit 2: Pyrolysis system

The residues are brought to the pyrolysis reactor through a dosing screw. The reactor is filled with nitrogen first to get rid of the Oxygen and to have an inert atmosphere. This prevents the organic compounds from reacting with the Oxygen. The reactor is made of an electrically heated screw and heats at about 600°C. The residence time of the residues in the reactor is approximately 40 minutes. The process forms biochar and pyrolysis gas.

Unit 3: Combustion chamber system

The pyrolysis gas is then burnt in a combustion chamber. It is initially fed into the first chamber, where the temperature is around 950°C. This process is called flameless oxidation as there are no visible flames in the combustion chamber. This helps to reduce the formation of nitrogen oxides (NOx) which are pollutants.

Unit 4: Thermal system

The exhaust gas then travels into a fire-tube boiler. The chamber of the boiler is filled with water, the exhaust gas runs in horizontal tubes through the boiler. The water is heated up to 180°C, with the heat of the exhaust gas, to form saturated steam. An economiser is installed after the boiler and utilises as much energy from the exhaust gas as possible. The exhaust gas temperature drops to 230°C after running through the system.

Unit 5: Exhaust gas treatment

The exhaust gas contains sulphur oxides (SOx), a pollutant that must be treated. If SOx are released in the atmosphere, H2SO4 will form, responsible for acid rains. Bicarbonate is injected into the exhaust gas pipe which neutralises the SOx. Finally, the filter traps the particles still in the exhaust gas before the gas is released into the atmosphere.

Unit 6: Biochar handling

After the pyrolysis, hot biochar is formed. It comes out of the reactor at about 600°C. It is cooled down with cold water continuously running in the envelope of the cooling reactor and moisturised with water before being stored in big bags.

Unit 1: Feedstock system

Our industrial client sends the residues through a conveyor system. They go through a metal separator and are separated from eventual metals. They are weighed when arriving at Circular Carbon and stored in a Silo. From the silo, the residues will be transported via two further conveyor systems to the pyrolysis unit.

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