Using Self-built Carbonization Kilns to Produce Good Charcoal - Mastering Techniques Is Key

The principle of using self-built carbonization kilns for charcoal carbonization is to place wood materials into a high-temperature oxygen-deficient furnace for dry distillation, producing a black substance - charcoal - through a high-temperature decomposition process. To successfully produce good charcoal in every kiln batch, the following key points must be mastered:

1. The carbonization kiln must be tightly sealed without any air leakage.

Once an earth kiln has air leakage, the amount of oxygen entering the kiln cannot be controlled. The fuel rods inside the kiln can easily undergo excessive self-combustion, causing the carbonization temperature to rise too quickly. Charcoal produced this way will have a loose texture and be prone to cracking. Even worse, excessive oxygen may cause some fuel rods to burn into white powder (ash), resulting in reduced charcoal yield and increased finished charcoal cost. Therefore, we must follow the manufacturer's technician's requirements for leak inspection work.

2. Pay attention to kiln temperature changes during the carbonization process.

First, we must understand that the rise in kiln temperature is caused by the self-combustion of fuel rods in the furnace or the heat generated by the combustion of decomposing combustible gases. Secondly, we must master the relationship between the speed of temperature rise and charcoal quality.

Generally speaking, under conditions where the kiln is airtight, if the temperature rises faster, the charcoal produced will have lower density, be more brittle, and have more cracks, but the carbonization time of fuel rods can be shortened, meaning monthly output per kiln can be increased. This type of charcoal is more suitable for industrial and agricultural use as well as hotpot cooking fuel.

If the furnace temperature rises more slowly, the internal structural changes of the fuel rods are balanced, decomposition is gradual, and carbonization speed is slower. However, the charcoal structure is harder and denser than the former, with a smooth surface, fewer cracks, and higher specific gravity. This has certain economic value for long-distance charcoal transportation, but the monthly output per kiln is lower. This type of charcoal is suitable for industrial and agricultural use as well as barbecue and hotpot cooking fuel.

As long as we skillfully master the above techniques, producing good charcoal will not be difficult.