Beware of carbon deposition on heating tubes of thermal oil boilers heaters!

Thermal oil furnace heaters rank among the most widely used units in industrial electric heating equipment. The heating tube serves as the core component of a thermal oil furnace heater, most commonly manufactured in flange-type construction. Carbon deposition on heating tubes is an essential factor to account for during thermal oil heating tube design, an issue analogous to limescale buildup on heating elements.

Below is a brief breakdown of root causes for tube carbonization:thermal oil carbonizes upon excessive overheating.Given the high surface temperature of heating tubes,insufficient flow velocity of thermal oil inside the barrel triggers localized overheating of oil alongside tube surface and subsequent carbon accumulation.

What countermeasures can be implemented to mitigate carbon formation?

1. From the heating tube design perspective, restrict surface load: keep linear power within 1.5~2 KW per meter to lower exterior operating temperature of heating tubes.

2. Select tube materials including medium carbon steel, high carbon steel and stainless steel, or anti-scale coated heating tubes customized by Yancheng Hotbox Electric Heater Co., Ltd. Such coated tubing effectively inhibits limescale formation and delivers noticeable anti-carbonization performance.

3. Adopt high-grade thermal oil for system operation.

4. Equip the furnace with high-flow circulating pumps; faster oil flow prevents localized overheating of thermal fluid.

5. Cool down equipment to ambient temperature before shutdown instead of halting operation under high working temperature. Emergency high-temperature shutdown cuts off oil circulation instantly while heating tube surfaces remain scorching hot, causing stagnant thermal oil to overheat locally and carbonize rapidly.

All aforementioned solutions target one core goal: reduce heating tube surface temperature to curb carbon deposition effectively.

The above analysis represents the technical viewpoint of the Engineering Department, Yancheng Hotbox Electric Heater Co., Ltd., for reference only. Inquiries via email are warmly welcomed. [sales@hbheater.com]