Causes of tube furnace tube damage
Tube furnaces are mainly used in metallurgy, glass, heat treatment, lithium battery anode and cathode materials, new energy, abrasive tools and other industries, and are professional equipment for measuring materials under certain temperature conditions. The furnace is simple in structure, easy to operate and easy to control. The furnace tube is an important equipment for heat transfer of the tube furnace. It operates under harsh conditions and sees fire directly, because it is impossible to leave a high safety factor in the process (otherwise, the furnace tube will be too thick). Therefore, it is necessary to It is more prone to damage than other general equipment in the factory. The damage to the furnace tube mainly includes wall thinning, cracking, internal and external corrosion, deformation and bulging, etc. So what are the reasons for these damages? Here is a brief introduction to the reasons:
1. Furnace tube coking:
The damage to the tube furnace tube is generally caused by coking. Coking is a phenomenon in which the temperature of the oil inside the furnace tube exceeds a certain limit and thermal cracking occurs, which turns into free carbon and then accumulates on the furnace tube. The damage process is: coking begins in the tube, which increases the temperature of the tube wall, thereby aggravating the oxidation of the surface and the corrosion of the furnace tube. Oxidation makes the thickness of the tube wall thinner, and then the thinning first bulges out under the dual action of internal pressure and heat. After the furnace tube is bulged, the gap between the inner wall of the tube and the coke layer will increase, so that the temperature of other parts of the furnace tube will gradually increase, which will further oxidize and thin, and eventually cause the furnace tube to rupture.
2. Local overheating:
If the flow rate in the pipe is reduced, the heat transfer coefficient of the medium in the pipe will be greatly reduced, the flow state of the medium in the pipe may change, and there will be deviations between the coils, and the consequences of them will be offset due to the heat load. Reduce the safety brought to the furnace tube, resulting in local overheating of the furnace tube under low load, commonly known as "dry burning".
3. Deterioration of heat transfer:
The deterioration of heat transfer is mainly because the burner is too close to the furnace tube. In order to improve the heat transfer, the combustion flame can be adjusted, the burner can be rearranged or the burner can be replaced, and the heating coil can be rearranged.
Therefore, in the process of using the tube furnace, we should pay special attention to the state of the furnace tube. Once the above phenomena occur, we should adjust it in time to avoid damage to the furnace tube.