How is the temperature zone inside the graphite electrode tunnel kiln divided?
The temperature zone inside the graphite electrode tunnel kiln can be divided into three zones: pre heating zone, roasting zone, and cooling zone.
Pre tropical:
In this area, the carbon billet (i.e. unprocessed graphite electrode) is heated to approximately 300 ° C. During this process, the required heat comes from the waste flue gas discharged from the roasting belt and the hot air exchanged by the cooling belt. After the carbon billet is preheated to the specified temperature, all waste smoke will be discharged through the exhaust holes in the preheating zone.
Baking zone:
The roasting zone is located in the middle of the tunnel kiln, where burners are usually placed to burn preheated air and fuel from the cooling zone, forming a high-temperature zone. After passing through the pre heating zone, the carbon billet enters the roasting zone and is heated to a higher temperature for roasting treatment, which usually can reach 850 ° C to 950 ° C. The roasting process helps to further solidify and harden graphite electrodes.
Cooling belt:
The cooling strip is located at the end of the tunnel kiln to reduce the temperature of the roasted graphite electrodes. This section usually utilizes waste smoke and hot air from the pre tropical zone for heat exchange to achieve cooling effects. The cooled electrode can stabilize and maintain its structure, avoiding cracks or other damage caused by rapid cooling.
These three temperature bands together constitute the basic working system of the graphite electrode tunnel kiln, and each link has a significant impact on the quality and performance of the electrodes.
