Temperature control technology of tube furnace

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Temperature control technology of tube furnace

First, let's understand the composition of the temperature control system

The temperature control system of the tube furnace usually consists of the following three main parts:

Temperature sensor: used to monitor the temperature in the furnace in real time and transmit data to the controller.

Controller: calculates the corresponding control signal according to the difference between the set temperature and the actual temperature.

Actuator: after receiving the control signal, adjusts the heating power to achieve precise temperature control.

After understanding the composition of the temperature control system, we can better understand the temperature control technology

Multi-stage program temperature control technology
Multi-stage program temperature control technology is one of the core technologies of high-temperature tube furnaces. It can set multiple temperature control stages according to actual needs, and each stage has different parameters such as temperature, time and heating rate. This technology can adapt to the heating needs of different materials and improve the yield and quality of products. Features include:

Temperature control: Multi-stage program temperature control technology can achieve precise temperature control and ensure the stability of the heating process.

Energy saving and high efficiency: By optimizing the control algorithm, the energy utilization efficiency of the equipment can be improved and energy consumption can be reduced.
Flexible and changeable: The temperature control stage can be flexibly set according to actual needs to adapt to the heating needs of different materials.

PID regulator
In practical applications, proportional integral differential (PID) regulator is usually used to achieve temperature control. The PID regulator automatically adjusts the power output of the heating element according to the difference between the set temperature and the actual temperature to achieve precise temperature control. In addition, it may be necessary to combine advanced control algorithms such as fuzzy control and neural networks to deal with more complex multivariate interference problems.

Methods to improve the accuracy of temperature control
In order to improve the accuracy of temperature control, the following measures can be taken:

Select high-precision temperature sensors: High-quality temperature sensors can provide accurate and stable temperature readings, providing strong support for temperature control.

Optimize controller parameters: By reasonably setting the controller parameters, the response speed and stability of the system can be improved.

Special temperature control technology

Temperature control of vacuum tube furnaces
As a high-tech heating equipment, vacuum tube furnaces are widely used in materials science, metallurgy, chemical industry and other fields. Its temperature control mainly depends on three parts: temperature sensor, controller and actuator. In addition to basic temperature control, reasonable temperature control can also reduce energy consumption and extend the service life of equipment.

Platinum-rhodium wire thermocouple
Platinum-rhodium wire is divided into B type, S type and R type. Platinum-rhodium thermocouple is also called high-temperature precious metal thermocouple, which is divided into single platinum-rhodium (platinum-rhodium 10-platinum-rhodium) and double platinum-rhodium (platinum-rhodium 30-platinum-rhodium 6). As temperature measurement sensors, they are usually used in conjunction with temperature transmitters, regulators and display instruments to directly measure or control the temperature of fluids, steam and gas media and solid surfaces in the range of 0-1800℃ in various production processes.

Safety and operating specifications for temperature control

Control the heating and cooling rate: When using a tubular furnace, the heating rate should be controlled to no more than 10 degrees per minute and the cooling rate should not exceed 15 degrees per minute in accordance with the specifications. Avoid rapid heating and cooling, which will help the furnace body to cool down steadily and maintain performance, and prevent damage to the furnace tube lining and heating wire due to rapid temperature changes.

Pay attention to the temperature when taking out the product: After the heat treatment of the product is completed, a small amount of process atmosphere should continue to be introduced and the temperature should be lowered until the temperature in the furnace is lower than the process requirements, and when taking out the product, wait until the furnace temperature is lower than 100℃. Following this specification, the furnace body can be cooled down in an orderly manner.

Conclusion
The temperature control technology of the tubular furnace is a complex issue involving many aspects. In actual operation, it is necessary to comprehensively consider equipment performance, process requirements and environmental factors to develop a suitable temperature control plan. Only in this way can the smooth progress of experiments and production be ensured, so as to achieve the purpose of improving experimental and production efficiency.

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