Wanqi THL-C3 энергосберегающая печь для производства древесного угля без

• Description of charcoal carbonization stove

Charcoal carbonization stove, which adopts advanced hot flue carbonizing technology, is one of our latest developed products. Modern-designed charcoal carbonization stove greatly increases carbonizing ratio from about 88% to 99%, and shortens carbonizing time (from 24 to 6 hours). Also this charcoal carbonization stove is characterized by easy operation, safety, efficiency, energy saving and environment protection.

Inner pots of charcoal carbonization stove for charcoal production can be hanged outside, which will save a lot of cooling time, so the productivity increases greatly. It is the ideal choice for charcoal production plant.

• Main features of charcoal carbonization stove

1. Easy operation and maintenance

2. High carbonization rate

3. No pollution

4. Continuous working

5. Newly developed carbonization stove, which can dry the materials with the superfluous energy produced in the process of carbonization.

6. The tube of fume extraction will recycle the gas comes from the inner stove during carbonizing process for continue warming the stove, and it will save 70% of energy consumption and recycle 95% of smoke.

• The structure of charcoal carbonization stove

Charcoal carbonization stove includes the following main parts: furnace body, furnace cover, heating chamber, inner pot. The furnace is made of steel, and the thickness is 6-8mm. The furnace is resistant to high temperature, deformation and oxidation. The chamber is covered with refractory brick, and the thickness is 120mm.

• Raw materials for charcoal carbonization stove

Almost all biomass materials are suitable for charcoal carbonization stove, such as different sizes of the wood, tree branch, wood sawdust, palm shell, coconut shell, Olive husk, bamboo, pinecone, macadamia nut, cashew nut shell, corncob, etc.

• Smoke purifying system of charcoal carbonization stove

For environment protection, the smoke generated by charcoal carbonization stove can be collected by smoke purifying system.

• Parameters of charcoal carbonization stove

• The stages in charcoal formation

As the raw material is heated in the charcoal carbonization stove it passes through definite stages on its way to conversion into charcoal. The formation of charcoal under laboratory conditions has been studied and the following stages in the conversion process have been recognized.

- at 20 to 110°C

The wood absorbs heat as it is dried giving off its moisture as water vapor (steam). The temperature remains at or slightly above 100°C until the wood is bone dry.

- at 110 to 270°C

Final traces of water are given off and the wood starts to decompose giving off some carbon monoxide, carbon dioxide, acetic acid and methanol. Heat is absorbed.

- at 270 to 290°C

This is the point at which exothermic decomposition of the wood starts. Heat is evolved and breakdown continues spontaneously providing the wood is not cooled below this decomposition temperature. Mixed gases and vapors continue to be given off together with some tar.

- at 290 to 400°C

As breakdown of the wood structure continues, the vapors given off comprise the combustible gases carbon monoxide, hydrogen and methane together with carbon dioxide gas and the condensable vapors: water, acetic acid, methanol, acetone, etc. and tars which begin to predominate as the temperature rises.

- at 400 to 500°C

At 400°C the transformation of the wood to charcoal is practically complete. The charcoal at this temperature still contains appreciable amounts of tar, perhaps 30% by weight trapped in the structure. This soft burned charcoal needs further heating to drive off more of the tar and thus raise the fixed carbon content of the charcoal to about 75% which is normal for good quality commercial charcoal.

To drive off this tar the charcoal is subject to further heat inputs to raise its temperature to about 500°C, thus completing the carbonization stage.