Frequency power supply in industrial applications

 

1. Metal melting furnace: This is the most widely used one, the development of the thyristor power in our country, began melting, smelting can be a variety of carbon steel, alloy steel,, cast iron, copper and aluminum also can, and for refining high-purity zinc and other nonferrous metals. IF power melting load is the worst load Impedance changes, unstable load, but the frequency power supply can ideally complete this task, the most prominent advantage is to save energy

1)   Metal melting furnace: This is the most widely used one, the development of the thyristor power in our country, began melting, smelting can be a variety of carbon steel, alloy steel,, cast iron, copper and aluminum also can, and for refining high-purity zinc and other nonferrous metals. IF power melting load is the worst load Impedance changes, unstable load, but the frequency power supply can ideally complete this task, the most prominent advantage is to save energy, power consumption per steel smelting IT around 500KW.h. Also easy starting, smooth steel, stirring vortex, good melting quality.

2)   Application through the hot areas: the workpiece in the heating process, the metal is heated as a whole, the workpiece can be achieved within and outside a temperature range. Also it is applied to the heat treatment before casting, pressing, extrusion, rolling and other metal materials.

3)   Since the intermediate frequency furnace heating time is short, little or only a small amount of oxide scale when heated, causing the scale weight loss of less than 0.5%, while gas stove caused by scale weight loss up to 20%, plus the loss of acid, waste is very big. Therefore, the use of frequency power supply, can greatly improve efficiency, and easy to maintain, reduce labor intensity, easy to automate.

4)   Induction heating, since the density of the high-frequency effect of the induced current from the surface to the interior is diminishing. The same material, the higher the frequency, the current density from the outer to the inner surface of the faster reduction

5)   Application on the heat treatment, the use of medium frequency current effect to improve the mechanical properties of steel, it has high hardness and resistance to fatigue, in terms of the steel pipe, heating frequency due to thick pipe diameter, wall constant thin-walled, steel pipe diameter smaller, the higher the frequency of induction heating.

6)   Quenching the load characteristics: little change in load, less chance of overcurrent and overvoltage, but the start is very frequent, short cycle operation.

 

2. Application of welding areas: frequency power supply can be used for welding, a welding speed, small heat affected around without pickling to remove oxide scale advantages. Should also be used to add (tempering) after welding aspect, can greatly improve efficiency.

Power of widely used, some applications are being developed, with the development of thyristor frequency power supply technology and application experience is gained, the thyristor frequency power supply will be more broad prospects for development.

  • 2016-07-05

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