The role of magnesium oxide in electric heating tubes

The role of magnesium oxide in electric heating tubes

Magnesium oxide powder refers to the electrical melting crystallization of magnesium oxide blocks, which are crushed and mixed with different particle sizes or numbers in a certain proportion, and are directly or modified to be used as insulation media for conducting heat at high temperatures in tubular electric heating components. In the electric heating tube, it mainly plays a role in fixing the center position of the resistance wire, ensuring that the metal shell is not electrified (insulated), and exporting the heat generated by the resistance wire. According to production methods and main purposes, it can be divided into the following four categories:,

1. General classification code: P.

2. Classification code for low-temperature moisture-proof type: D.

3. Classification code for medium temperature and moisture-proof type: Z.

4. High temperature classification code: G.

Performance requirements for magnesium oxide powder:

1. At working temperature, MgO powder should have high thermal conductivity in order to quickly transfer heat to the surface of the tube, making the resistance wire closer to the temperature of the tube wall;

2. When the working temperature is within 1100 ℃, MgO powder should have good insulation performance;

3. MgO powder must have a certain particle size, and its shape is generally circular rather than flaky, as the circular powder has high density, good fluidity, and a certain percentage of particles. When adding powder, it is not easy to damage the heating wire, ensuring no difficulty in powder filling;

4. MgO powder should have no corrosion on heating wire materials and pipes under normal or high temperature conditions.

5. The water absorption rate of magnesium oxide powder shall not exceed the following regulations:

(1) Normal type ≤ 1.5%

(2) Low temperature moisture-proof type ≤ 0.05%

(3) Medium temperature moisture-proof type ≤ 0.10%

(4) High temperature type ≤ 0.10%

In industrial heating equipment, the use of electric heating pipes is still relatively common, not only because the electric heating pipes are environmentally friendly, stable, and cost-effective, but also because the electric heating pipes are small in size, large in power, safer in operation, average in medium outlet temperature, high in temperature control accuracy, and widely used. These many characteristics are important guarantees for the safe and stable operation of production line channels.

The electric heating tube generates heat quickly and evenly during operation. The device normally uses an electric heating tube to attach an induction device on top of it, without manual intervention. It actively senses the working temperature and converts electrical energy into heat energy, fully utilizing the heat energy. Relatively speaking, the more excellent the working environment, the more effective and better the heating effect will be. This type of heating is not only green and environmentally friendly, pollution-free, low energy consumption, but also energy-efficient, which is particularly in line with social development trends and responds to the national call to save materials and costs for enterprises.

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