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The First Procedure of Machine-made Charcoal
2012-12-12

The First Procedure of Machine-made Charcoal

 

Drying is the first technical procedure in the production process of machine-made charcoal. Raw materials with appropriate moisture content are the premise to produce high quality machine-made charcoal.

If the raw material is too dry, it can lead to finished charcoal briquettes have longitudinal cracks or it results in the burning of briquettes. At this time, we should add some raw materials that are not dried. And high moisture materials will usually cause transverse cracks of charcoal briquettes. Relative to the briquetting and carbonizing processes, drying procedure has less technology content, but it is the one procedure that has the safe hidden troubles. Therefore, in many actual productions, we should improve safety awareness.

Most of carbon factory manufacturers adopt hot airflow type drying machine. This kind of dryer has the advantages of direct heating, drying speed and it can be folded installation, which saves space.

Its principle is to let the damp raw material in the pipe and high temperature air mixing and finally gets moisture content to meet the requirements of raw materials through the separator. A qualified dryer at least has the following parts: fuel furnace, feed roller, deceleration electric motor, segments containing insulation pipe and elbow, fan and separator.

Drying machine also has certain requirements to raw materials volume.  The general requirement is that particle diameter should be less than 8 mm.

Generally speaking, the moisture content of our raw materials is between 25% and 50%. After cooling by natural air, the moisture content of raw materials is about 18%, but they can’t be used.

Drying intensity to raw materials of drying machine is not uniform and stable. Every time open the door to add fuel, due to the cold wind in, the temperature of the pipeline will be reduced quickly. But in the whole drying process, adding raw materials is very frequent (at least ten minutes once). So the best way is judge its moisture content is qualified or not by looking and touching. Generally speaking, if the appearance of raw material is coke yellow and it seems to have the universal oil feeling, the moisture content is qualified. Further verification method is that catching some raw materials in hand to see whether the raw materials can be natural even scattered. This is the normal test method.

 

 

Actually, finally procedure affecting the raw material moisture content qualified or not is briquetting machine. As long as it can briquette out qualified briquettes, then the water content of raw material will meet the requirements. The key is to control raw material drying temperature. An experienced worker can judge the voice in the piping temperature is too high or not according to the sound.

The ideal fuel of drying machine is soft coal that has length flame and is resistance to burning. The length of the flame will affect the drying effect in the very great degree. Ideal situation is: in the initial stage, raw materials into the pipe will walk together with flame under the draught fan at high speed and much of the moisture content of raw material is separated out in this period. But many coal’s flame cannot reach the requirements, such as Datong coal. In addition, fuel flame resistance is also very important. The resistance fuel will reduce the number of times we switch door so as to ensure the drying degree of uniformity.

More information, please visit our website http://www.briquettemachine-pelletmill.comor contact me by vivien@asico-group.com

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