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What is the working principle of an electric heating radiant tube?
Release time:
2022-03-25
What is the working principle of an electric heating radiant tube?
Electricity Radiation tube It is a substance that converts electrical energy into thermal energy to provide heating. When the heating tube is operating, a low-temperature fluid medium enters its inlet through a pipeline under pressure and flows along a specially designed heat-transfer channel inside the electric heating container. The fluid thermodynamic principle underlying the design of the air electric heating tube ensures that the high-temperature thermal energy generated by the electric heating element within the tube is carried away along this path, thereby raising the temperature of the heated medium inside the tube. At the outlet of the electric heating tube, the medium attains the high temperature required for the process.
The internal control system of the electric heating radiant tube automatically adjusts the output power of the electric heating element based on signals from the temperature sensor at the output port, ensuring a uniform medium temperature at the outlet of the air electric heating tube. When the heating element of the air electric heating tube overheats, its independent overheat protection device immediately cuts off the heating power supply, preventing the heating material inside the air electric heating tube from coking, deteriorating, or carbonizing due to excessive temperature. In severe cases, this could even lead to burnout of the heating element, thereby effectively extending the service life of the electric heating tube. What are the different classifications of electric heating radiant tubes?
1. Wire-wound spiral electric radiant heating tube; 2. Strip-wound spiral electric radiant heating tube; 3. Axial corrugated cage-type electric radiant heating tube (commonly known as "rod-cage type").
Characteristics, Protective Measures, and Types of Electric Radiation Tubes
What are the characteristics of electric radiation tubes?
Radiant heating tubes enclose electric heating elements within a protective sheath. When energized, these elements generate heat, which is then radiated indirectly through the sheath to the furnace lining and workpieces. They are widely used in various heating furnaces in the heat treatment industry. Currently, there are three main types of radiant heating tubes: cage-type, vertical belt-type, and spiral-type. The heating elements are made from imported or domestically produced resistance wires, nickel-chromium wires (or strips), or iron-chromium-aluminum wires (or strips). The protective sheaths are fabricated from imported high-temperature alloy plates, heat-resistant steel plates, or by roll welding or centrifugal casting, offering excellent high-temperature oxidation resistance, carburization resistance, and long service life.
Use electricity Radiation tube What are the general precautions?
The component is permitted to operate under the following conditions: (1) The relative humidity of the air shall not exceed 95%, and there shall be no explosive or corrosive gases present; (2) The operating voltage shall not exceed 1.1 times the rated value, and the enclosure must be effectively grounded; (3) Insulation resistance: 1 MΩ, insulation strength: 2 kV/1 min. 2. The electric heating tube must be properly positioned and fixed; the effective heating area must be completely immersed in a liquid or solid metal. Dry firing is strictly prohibited. If scale or carbon deposits accumulate on the surface of the tube, they should be promptly removed before reuse to avoid impairing heat dissipation and shortening the service life. 3. Heat molten metals or solid nitrates and alkalis.
What type of device is an electric radiation tube?
The wire-wound spiral electric radiant tube consists of a heat-resistant alloy 100 steel sleeve and a heating element. Typically, the heating element is made by winding electric heating wire around a heat-resistant, insulating ceramic core with spiral grooves.
2. The structure and construction of the heaters are basically the same; the only difference is that the heating element is wound with resistance strips. The molds mainly consist of several sets of dies. Under the same surface load, this design offers a larger heat dissipation area and saves materials. Generally, high-power spot heating radiant tubes should adopt this type of construction.
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