Abstract
Entrained flow slagging gasifiers are used to covert coal, petcoke and other carbon feedstock to syngas (CO and H2), which is used as a fuel in power generation or is converted into chemical products. During the gasification process, gasifier components such as refractory liners, syngas coolers, and thermocouples are aggressively attacked by corrosive slags and gases originating from the carbon feedstock, materials that contain arsenic, sulfur, phosphorous and other impurities; –all of which are in a mixed equilibrium condition during gasification. This research evaluated the effect of phosphorous gas generated during gasification on the corrosion degradation of Pt-Rh thermocouple sensor materials. Phosphorous interactions with Pt-Rhx (x = 0 – 30 wt.%) alloys have been analyzed isothermally at 1012 °C. Phosphorous diffusion into the alloy is discussed.
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