Patent ID: 8530780
Filing Date: 2013-09-10
Classification: H05H

Abstract:
1. A method for reducing the erosion of first and second electrodes of a DC steam plasma torch, the method comprising the steps of: providing a steam generator to provide coolant; connecting a negative high-voltage terminal of a DC power supply to a helical coil via a conducting element; connecting another terminal of the DC power supply to the first electrode; providing first coaxial thermostatic piping comprising a first swirl generator to introduce primary working gas into the first and second electrodes; providing a trigger generator to generate a discharge arc between the first and second electrodes; gradually increasing the current and the flow rate of the primary working gas; causing an arc root to enter the internal side of the first and second electrodes to generate a high-speed swirl on the internal side of the first and second electrodes; providing second thermostatic piping comprising a second swirl generator to introduce auxiliary working gas into the second electrode periodically to regulate the pressure in the rear electrode to move the arc root to and fro axially; providing an inlet conduit to introduce pulsed and pressurized air into the second electrode to clean the internal side of the second electrode of residual powder to retain the normal distribution of a current filed in the second electrode to stabilize the properties of the operation of the DC steam plasma torch.