Arc-striking method for plasma torches

Abstract

The invention aims to provide an arc-striking method for plasma torches, which is applicable to arc-striking of high-power and long plasma torches. The method includes connecting at least two arc-striking return circuits and a plasma power source to a plasma torch in parallel, starting-up the return circuits after the plasma power source supplies power to the plasma torches to sequentially break through adjacent electrodes of the plasma power source from a first-stage electrode so as to generate electric arcs, and forming longer electric arcs after connecting the electric arcs which are blown in the central area of the torch by airflows. The principle used in the method is that a pulse capacitor has charging-and-discharging characteristics, and arc-striking of the plasma torches is realized step-by-step successfully.

Description

technical field [0001] The invention relates to an arc striking method, in particular to a plasma torch arc striking method. Background technique [0002] With the development of plasma technology, the application of plasma has become more and more extensive. In the field of plasma chemical industry, the power of the plasma torch has also increased to MW level, and the length has also continued to increase. The design of the too long plasma torch causes the arc to strike when the plasma torch starts. Therefore, it is a technical problem to be solved by the plasma industry to study a plasma arc ignition system matched with a high-power and long plasma torch. Chinese patent 200820238347.X and Chinese patent 201020509565.X both introduce arc striking devices, which are high-frequency arc striking systems suitable for plasma torches with low power. Contents of the invention [0003] The object of the present invention is to provide an arc striking method of a plasma torch, wh...

AI Technical Summary

Problems solved by technology

[0002] With the development of plasma technology, the application of plasma has become more and more extensive. In the field of plasma chemical industry, the power of the plasma torch has also increased to MW level, and the length has also continued to increase. The design of the too long plasma torch causes the arc to strike when the plasma torch starts. Therefore, it is a technical problem to be solved by the plasma industry to study a plasma arc ignition system matched with a high-power and long plasma torch.

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