Research On Ablation Mechanism And Performance Of High Conductivity Anode

As we all know,oil is very rare in China,however,in the process of thermal power unit start-up,traditional ignition mode requires a lot of fuel to ignite pulverized coal to start-up and steady combustion,so it is of great significance to save oil resources in terms of energy security.Plasma ignition device can be used without any oil to ignite pulverized coal,thus,save oil during boiler ignition,stable combustion and debugging.In this paper,a basic composition of the plasma ignition system was designed using Al2O3 ceramics fittings connect the cathode and anode to guarantee the plasma beam co-axial with anode hole.A series of plasma anode materials were choose and the anode ablation experiments was conducted in the simplified ablation device.In terms of anode materials,adding the element Te in pure copper to prepare Cu-0.1Te(wt%),Cu-0.2Te(wt%),Cu-0.3Te(wt%),Cu-0.4Te(wt%)materials and the pure copper was set as contrast test.The change of anode ablation rate and the impact on the electrical conductivity were analyzed.SEM and EDS were used to analysis the mechanism of the anode ablation process.The results showed that the tellurium can refine the grain,but the fine grain accelerated the ablation rate of alloy anode.Conductivity dropped,plasma ablation time reduced but the thermal conductivity increased with the increasing of tellurium.This paper provides important reference basis for the research on copper-tellurium alloy used as the anode material.