How Does a Tube Furnace Work?

Dual heating zone tube furnace is an important heating equipment with a maximum operating temperature of 1100℃, independent dual temperature zone, 6"/8.5"/11" multi-specification furnace tube adaptation and S series special sealing structure. Its working principle is not simple power-on heating, but through the coordination of heating system, temperature control system, atmosphere control system and structural adaptation design, the whole process management from temperature control to environmental protection is realized, and it provides a reliable high temperature environment for experiments and production.

The heating system of the dual heating zone tube furnace uses ferromolybdenum-doped aluminum alloy as the heating element to construct a gradient temperature field. The furnace body is divided into two independent heating zones along the axial direction. The material not only has excellent high temperature resistance, but also has strong oxidation resistance. It can stably maintain the resistance value in the long-term working environment of 1100℃, and avoid temperature fluctuations caused by component aging from the root cause. The heating element is evenly wound on the outside of the alumina tube to form an annular heating structure, so that the heat is evenly distributed. When the dual heating zone tube furnace is energized, the components generate heat through the Joule effect, and the heat conduction and thermal radiation through the alumina tube are transmitted to the inside of the furnace tube, quickly forming a uniform temperature field. The advantage of the dual-temperature zone design is that each heating zone is powered by an independent power supply module, and the target temperature can be set separately according to the experimental requirements to meet the gradient temperature requirements.

The real-time monitoring and feedback adjustment of the temperature control system are the key points to make the temperature of the dual heating zone tube furnace accurate. The dual heating zone tube furnace is equipped with dual K-type thermocouples. One of the thermocouples is directly inserted into the furnace tube to collect the actual temperature of the core reaction area in real time, and the other is used as a temperature inspector to continuously inspect the temperature of each point in the heating zone and automatically record the data, which not only ensures the accuracy of the core temperature data, but also provides complete data support for the traceability of the experimental process and parameter optimization. The temperature signals collected by the two thermocouples will be transmitted synchronously to the high-precision PID automatic temperature control system. The temperature control system dynamically adjusts the power supply of the corresponding heating zone by comparing the actual temperature and the set temperature in real time. When the actual temperature is lower than the set value, the power is automatically increased to increase heat production. When the actual temperature is higher than the set value, the power is reduced in time to reduce heat production. In addition, the dual heating zone tube furnace also supports a multi-stage program temperature control function. Users can preset parameters such as heating rate, heat preservation time, and cooling rate according to the experimental process to reduce the error of human operation.

The atmosphere control system of dual heating zone tube furnace achieves efficient sealing through a combination of hinged flanges and O-rings. According to the experimental needs, the dual heating zone tube furnace can flexibly construct different atmospheres. If a vacuum environment is required, the vacuum pump can be connected through the flange interface to reduce the air pressure in the furnace tube and meet the needs of vacuum annealing of metal materials. If an inert gas atmosphere is required, the flow rate of argon, nitrogen and other gases can be accurately controlled through the gas flowmeter, and the micro-positive pressure can be maintained after the gas is introduced and the internal air is discharged, so as to avoid the material being oxidized at high temperatures.

The structure of the dual heating zone tube furnace is adapted to meet a variety of needs. Dual heating zone tube furnace is divided into type I/II/III. Type I is suitable for 6" furnace tubes for small batch experiments. Type II is suitable for 8.5" furnace tube and is used for pilot testing. Type III is suitable for 11" furnace tubes, supports production-grade large sample processing, and covers the process requirements of a few grams to several kilograms.

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