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Solid Particle Erosion Characterization of Materials for Power Generation

pubblicazioni - Presentazione

Solid Particle Erosion Characterization of Materials for Power Generation

Questo lavoro fornisce una panoramica dell’esperienza RSE nel campo delle prove di erosione da particolato solido ad alta temperatura di materiali metallici e rivestimenti ceramici per utilizzati o passibili d’impiego negli impianti per la generazione d’energia elettrica.

Solid particle erosion (SPE) has been outlined as one of the main problems concerning both steam power plant and land based gas turbines. In steam power plants, candidate alloys for manufacturing high pressure steam turbine diaphragms, buckets, radial seals and control valves should exhibit, among other properties, even a good resistance at the erosion phenomena induced by hard solid particles: in fact ferric oxide (magnetite) scales cause SPE by exfoliating from boiler tubes and steam pipes (mainly super-heaters and re-heaters) and being transported within the steam flow to the turbine. In coal-fired utility power stations very large quantities of solid fuel and ash products are present. Therefore most of coal-fired power plants suffer from abrasion and erosion wear caused by pulverised coal and fly ashes. Thermal barrier coatings (TBC) are used to protect hot path components gas turbines from hot combustion gases. Volcanic ashes and sand present in air are the main causes of solid particle erosion failure for TBC in gas turbines, this is true especially in the case of aero engines although some occurrences even on land based turbines are reported. This work reports the experiences at RSE in the field of high temperature solid particle erosion carried out on metallic materials and ceramic coatings for power generation.

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