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Erosion of carbon steel by fly ash and unburned char particles was measured in the convection section of an industrial boiler firing micronized coal. The rate of erosion was enhanced by directing a small jet of nitrogen, 3 vol.% oxygen in nitrogen, or air toward the surface of a test coupon mounted on an air-cooled tube.Ash and char particles suspended in the flue gas entrained by the jet were accelerated...
Coal as mined is a mixture of a combustible solid hydrocarbon, with a high C:S ratio, and largely incombustible mineral matter. During combustion, the non-carbonaceons mineral matter may undergo some changes, both physical and chemical; but in most combustion processes some part of it ends up as solid particles of a size which enables them to be entrained in the combustion gas as it flows through...
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