The role of electric heating wires in heating tubes cannot be underestimated

The role of electric heating wires in heating tubes cannot be underestimated

In the previous article "How to Make Better Selection of Heating Tube Materials", we shared the manufacturing process of heating tubes and the selection of required materials. The selection of each material should not be careless, as it directly affects the quality of the heating tube product. Key materials for the construction of heating pipes: 1. Sleeve material (shell); 2. Resistance wire (electric heating wire); 3. Magnesium oxide powder; 4. Sealing. Among these materials, the heating pipes, heating wires, magnesium oxide powder, and sealing materials used for heating equipment in different environments are different. Today, let's talk about the selection of electric heating wires. Why not underestimate it?

The heating tube is mainly composed of external metal pipes, high-temperature magnesium oxide powder, and internal electric heating wires. The production of the heating tube first selects the appropriate electric heating wire diameter according to the required voltage and power, and then processes it into a uniform and fine spiral shape on a wire winding machine. Secondly, the metal pipes are shrunk and quenched according to actual needs, and finally, the heating wires are evenly distributed inside the pipe, Then, a powder loading machine is used to fill the gap between the electric heating wire and the inner wall of the metal tube with dense high-temperature magnesium oxide powder, and the outlet end of the tube is sealed for insulation treatment. The three main components of the heating tube are all indispensable and complement each other. The external metal pipes mainly serve as containers, protecting the internal structure and heat transfer; High temperature magnesium powder mainly plays a role in heat conduction and insulation, so that there is no conduction between the electric heating wire and the metal pipe, and it can be used safely; The electric heating wire is the core of the heating tube, mainly playing the role of electrification and heating, and is the source of heat for the heating tube.

Due to the different environments used, the internal heating wires of the heating tube are also different in production, mainly including iron chromium aluminum wire and nickel chromium wire.

Iron chromium aluminum electric heating wire: good antioxidant performance, high resistivity, low high-temperature strength, easy to deform and bend at high temperatures, high surface load, and cheap price.

Nickel chromium electric heating wire: good plasticity, strong corrosion resistance, not easy to deform after long-term high-temperature use, long service life, and relatively expensive price.

How should customers choose the internal heating wire of the heating tube, and how should they consider the price cost, usage temperature, and usage frequency?

Price cost: Generally, nickel chromium is several times more expensive than iron chromium aluminum in terms of price cost, so considering the actual needs, choose a suitable electric heating wire.

Usage temperature: In terms of usage temperature, iron chromium aluminum has a higher temperature. However, in long-term high-temperature environments, iron chromium aluminum is more prone to deformation and bending than nickel chromium, which can affect its service life. Therefore, it is generally recommended to use nickel chromium electric heating wires in high-temperature environments, which have a long service life and are not easily deformed.

Usage frequency: Nickel chromium electric heating wire has better stability and plasticity than iron chromium aluminum electric heating wire. Therefore, in long-term and high load usage environments, using nickel chromium electric heating wire will ensure its lifespan and usage.

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