Industrial electromagnetic heating process, apparatus and use

Abstract

The invention relates to an industrial electromagnetic heating method and relative device. Wherein, said method comprises: coating multilayer electromagnetic induction heating coil plane or arc on the frame of heated metal container or tube; or using electromagnetic induction to directly heat the metal container or tube; it mounts the multilayer electromagnetic induction heating coil formed by at least two layer of electromagnetic coils outside the heated metal container or tube; the magnetic lines of layered by electromagnetic heating coils functions the heated metal container or tube; the whole compound multilayer electromagnetic induction heating coil heating method comprises: the rectification circuit transforms the external alternative voltage into direct-current voltage, the control circuit transforms the direct-current voltage into high-frequency voltage, then functions the high-frequency voltage on the compound multilayer electromagnetic induction heating coil, to use electromagnetic induction to heat the material inside the metal container or tube.

Description

technical field [0001] The invention belongs to an electromagnetic heating method and device, in particular to an electromagnetic heating method and device applied in industry. The present invention also relates to the application of the aforementioned method and device, which are mainly used in plastic (rubber) molding machinery, pipelines for transporting crude oil and heavy oil, and other industrial heating places. Background technique [0002] In industrial production, it is often necessary to heat materials. Now there are two general industrial heating methods, one is to use fuel for heating, and the other is to use electric energy for heating. With the development and progress of industry, more and more industrial and mining sites use electric energy to heat, but now most of the electric heating is still directly heated by electric heating devices, and then heated by heat conduction. For example, the heating method of plastic processing machinery is to use the electr...

AI Technical Summary

Problems solved by technology

[0004] 1. In practical applications, the installation distance between the two coils is required to be ≥50mm, otherwise strong magnetic field interference will be generated between the coils, which will affect the normal operation of the electromagnetic controller

[0005] 2. It is not suitable for heating equipment with a large diameter pipe, because under the premise of maintaining a suitable inductance, the number of coils wound with a large diameter must be reduced, and the thermal efficiency will be reduced.

[0006] 3. Some pipes are long, and some pipes have flanges or dies in the middle, and the circular electromagnetic induction heating ring cannot be installed and used.

[0008] 1. The inductance per unit area is low, which is only suitable for low-power heating equipment

[0009] 2. The distance between the coil and the heated metal equipment is required to be large, the thermal efficiency is low, and the energy saving effect is not very good

[0010] The disadvantage of the electromagnetic induction heating coils with the above two structures is that the heating power density per unit area is small, which is not suitable for equipment that requires high heating power density, which limits their wide application.

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