HOW TO PRODUCE CHARCOAL USING A DOME FURNACE
HOW TO BUILD DOME FURNACE
The first step in building a dome furnace is land preparation which includes soil leveling and hardening. The land to be used must be leveled so that the furnace building can be balanced. To strengthen the furnace, the land below it must be hardened using gravel rocks which are then compacted.
The next step is to start building the stove. The construction begins with the installation of the foundation in accordance with the initial planning of the dome body. The Foundation is made of bricks arranged with sand and clay which is used for hardening the foundation and dome body.
If the foundation has been made well, then the development of the dome body is continued. Requirements for the dome that must be included include combustion holes, wood entry holes and chimneys. The combustion hole is made of a small half circle with a diameter of about 30 cm. for wood entry holes made as necessary to maximize the amount of wood entered. It is attempted so that the size of the hole can be entered by people who want to arrange the wood inside. If you want to take wood vinegar, the chimney should be directly connected to a wood vinegar condenser to save on the cost of building a stove.
PREPARATION OF RAW MATERIALS
The diameter of wood that can still be burned in a dome furnace ranges from 10-25 cm. This wood does not need to be dried because it will actually hamper the production process. Then the wood is directly inserted into the dome with the position of the wood standing and arrangement arranged as closely as possible. This is to prevent the wood from becoming ash, because the wider the cavity, the greater the combustion. After everything to be entered, the hole is tightly closed with bricks coated with clay. In the fire pit small twigs are inserted as the initial trigger of combustion. The branches are inserted as deep as possible but can still be reached, this is to further accelerate the flame.
CHARCOAL COMBUSTION PROCESS
All holes in the furnace are left open first, except for the wood entry holes that have been closed after the wood has been inserted. Burning can be immediately started by burning the branches in the combustion hole. Let the fire spread into the stove and burn all parts evenly. This is indicated by the release of smoke from the furnace which takes about 6 hours.
After 6 hours, the initial combustion hole step by step began to be closed using plastered bricks to leave a little hole that is about 6 x 6 cm wide. Henceforth, continue setting the existing air holes around the dome. Arrangement of air holes here, if the first air hole has been seen, then the pit must be closed immediately. And so on until the embers are visible until the top hole and the entire air hole are closed. If the combustion process goes well, after 48 hours the smoke produced is thick and contains tar and wood vinegar. then at that time the condenser can be installed. If the combustion has been running for 55 hours, the smoke has started to thin out and that means the combustion process is complete and the charcoal inside the dome is cooked. What needs to be done is the furnace cooling process to stop the combustion.
END PROCESS IN PRODUCTION OF CHARCOAL
The steps that need to be done to stop burning in the dome furnace is to cover all the remaining air holes including the chimney. The time needed to make the charcoal in the dome cools for about 2 days, counts quite a long time. This is because the charcoal capacity in the furnace is very large.
In addition to the two-day limit, to know the state of charcoal in the furnace can be done by holding the dome furnace and feeling the temperature inside. When the temperature is normal and does not feel hot, it means the charcoal is cold and ready to be harvested.
To remove charcoal from inside the stove is done by opening a wood insertion hole that had previously been closed using bricks. Once opened, the charcoal is then carefully removed so the wood charcoal does not break or even crumble. Because whole charcoal will be more desirable than broken or split charcoal