Electric heater is used for heating, insulation, and heating of flowing liquid and gaseous media

Electric heater is used for heating, insulation, and heating of flowing liquid and gaseous media

When the heating medium passes through the heating chamber of the electric heater under pressure, the huge heat generated during the operation of the electric heating element is uniformly carried away using the principle of fluid thermodynamics, so that the temperature of the heated medium meets the user's process requirements.

Heating method

Resistance heating

Using the Joule effect of current to convert electrical energy into thermal energy to heat objects. It is usually divided into direct resistance heating and indirect resistance heating. The power supply voltage of the former is directly applied to the heated object. When a current flows through it, the heated object itself (such as an electric heating and ironing machine) will generate heat. The object that can be directly heated by resistance must be a conductor, but it must have a high electrical resistivity. Due to the fact that heat is generated from the heated object itself, it belongs to internal heating and has a high thermal efficiency. Indirect resistance heating requires heating elements made of specialized alloy or non-metallic materials, which generate heat energy and transmit it to the heated object through radiation, convection, and conduction. Due to the fact that the heated object and heating element are divided into two parts, the type of heated object is generally unrestricted and easy to operate.

The materials used for heating elements in indirect resistance heating generally require high electrical resistivity, low temperature coefficient of resistance, minimal deformation at high temperatures, and less susceptibility to embrittlement. Commonly used metal materials include iron aluminum alloys, nickel chromium alloys, and non-metallic materials such as silicon carbide and molybdenum disilicide. The high working temperature of metal heating elements can reach 1000-1500 ℃ depending on the material type; The high operating temperature of non-metallic heating elements can reach 1500-1700 ℃. The latter is easy to install and can be replaced in a hot furnace, but it requires a pressure regulating device during operation and has a shorter lifespan than alloy heating elements. It is generally used in high-temperature furnaces, places where the temperature exceeds the allowable high working temperature of metal heating elements, and certain special occasions.

induction heating

The thermal effect formed by the induced current (eddy current) generated by the conductor in an alternating electromagnetic field causes the conductor itself to generate heat. According to different heating process requirements, the frequency of the AC power supply used for induction heating includes power frequency (50-60 Hz), medium frequency (60-10000 Hz), and high frequency (above 10000 Hz). Power frequency power supply is a commonly used AC power supply in industry, and the vast majority of power frequencies in the world are 50 hertz. The voltage applied to the induction device by the power supply used for induction heating must be adjustable. According to the power of the heating equipment and the capacity of the power supply network, a high-voltage power supply (6-10 kV) can be used to supply power through a transformer; Heating equipment can also be directly connected to a 380V low-voltage power grid.

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