Charcoal conversion rate is an important problem for the customers who want to invest in charcoal production. It determines the cost of making charcoal. Because the most costly part of making charcoal is raw materials cost.
Usually, the cost of the raw materials accounts for 50%-60% of the cost of producing charcoal, and the rest is labor, electricity, and rental expenses.
How many kgs of wood (biomass materials) can produce one kg charcoal? This question is often asked by the customers.
To make this question clear, we use the common case “sawdust to charcoal” to analyze the carbonizing ratio.
About the steps of producing charcoal from sawdust, you can reference our page biomass charcoal briquettes plant
We know that the humidity of sawdust should be around 10% to make the best quality sawdust briquettes.
From sawdust to briquettes, dried sawdust must pass through the high temperature and high-pressure mold of sawdust briquette machine. In this process, sawdust moisture will reduce further, but not much, and it can be even neglected.
From sawdust briquettes to charcoal, the sawdust briquettes are charred by carbonization furnace or earthen kiln. In this step, the weight of sawdust briquettes will shrink greatly.
Usually, the moisture of natural dried materials is 20-30%. After dried by the sawdust dryer, the water content can be reduced further to 10%, this kind of material charcoal conversion rate is about 1/3.
For the fresh biomass materials, humidity can reach 50-60%, it will need about 4 tons of materials to produce 1-ton charcoal.
For some good quality materials, such as coconut shells, wood chips, bamboo, they can be carbonized directly by the carbonizing machine. The charcoal conversion rate is about 1/3.
A tiny part of customers just want to get the by-products in producing charcoal, such as wood vinegar, so in order to extract wood vinegar as much as possible, they do not care about the quality and conversion rate of charcoal.