In dry burning scenarios of electric heating tubes, fan circulation is a key factor affecting power setting, but many users ignore this point and set the power uniformly, resulting in frequent damage to heating tubes. According to experience, the difference in power setting between dry burning with fan circulation and without fan circulation is very large, and confusing the two will directly affect the service life and safety of heating tubes.
First, we need to understand the role of fan circulation in dry burning. When the electric heating tube is in dry burning, it generates a lot of heat. If there is no fan circulation, the heat will accumulate around the heating tube, making the local temperature rise rapidly, and the heating wire inside the heating tube will be in a high-temperature state for a long time. If there is a fan circulation, the fan can quickly take away the heat around the heating tube, reduce the local temperature, and ensure that the heating tube works in a safe temperature range. This difference directly determines the power setting standard.
For dry burning with fan circulation, the recommended ratio of heating zone length (meter) to power (W) is 1:1.5. That is to say, a heating tube with a heating zone length of 1 meter can be set to 1500W, a 2-meter heating tube can be set to 3000W, and so on. This ratio is obtained through a lot of practical tests. According to experience, heating tubes set according to this ratio can work stably for 2-3 years under normal use. The fan circulation ensures that the heat is dissipated in time, so the power can be appropriately increased to improve heating efficiency without causing overheating of the heating tube.
For dry burning without fan circulation, the ratio must be strictly controlled at 1:1. A 1-meter heating tube can only be set to 1000W, and a 2-meter heating tube can only be set to 2000W. If the power is set higher than this ratio, the heat cannot be dissipated in time, and the heating tube will overheat quickly. For example, a 1-meter heating tube set to 1500W without fan circulation will burn out within a week, and even cause the sheath to melt and leak electricity, which is a great safety hazard. Many small workshops often make this mistake, thinking that increasing power can speed up heating, but in fact, it is not worth the loss.
There are also some details to pay attention to. When using fan circulation, it is necessary to ensure that the fan works normally. If the fan fails and the heating tube continues to work, it is equivalent to dry burning without fan circulation, and the power is too high at this time, which will quickly damage the heating tube. Therefore, it is recommended to install a fan failure alarm device to stop the heating tube in time when the fan fails. In addition, the installation position of the heating tube also affects heat dissipation. For dry burning with fan circulation, the heating tube should be installed in the air flow channel to ensure that the fan can fully take away the heat.
Another common mistake is that some users think that the power can be increased as long as the fan is installed, regardless of the air volume of the fan. In fact, if the air volume of the fan is too small, the heat dissipation effect is not good, and the power should be appropriately reduced. For example, a small fan with low air volume can only support a power ratio of 1:1.2 for a 1-meter heating tube, not 1:1.5. According to experience, the air volume of the fan should be matched with the power of the heating tube to ensure effective heat dissipation.
In summary, the power setting of dry burning electric heating tubes must distinguish between scenarios with and without fan circulation: 1:1.5 ratio for fan circulation and 1:1 ratio for no fan circulation. At the same time, it is necessary to ensure the normal operation of the fan and the reasonable installation position of the heating tube. Different dry burning equipment (such as industrial ovens, air heaters) have different fan configurations and heat dissipation conditions, and professional scheme design is needed to set the most suitable power.
