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- W2051752685 abstract "The hypothesis that nucleation of ash constituents in practical coal combustors can be influenced by the temperature quench rate was tested in a laboratory 2–5 kg/h pulverized coal furnace. Two Beulah lignite coals, similar in heating value and overall ash content but differing in the sodium content, were tested. Ash samples were withdrawn at various residence times down the combustor, segregated by size, and analyzed for their bulk, surface and interior composition. Increasing temperature quench rate beyond 400 K/s significantly increased the fraction of the inlet sodium appearing in the small particle size range. This was because a sodium-rich “fume” was frozen in the particulate phase during temperature quench, although surface enrichment of the sodium on the larger particles was also realized under these conditions. Subtle differences in these otherwise similar coals appeared to exert a large influence on the primary mechanisms forming the small particles. Although the low sodium coal contained approximately half the sodium of the other, it yielded less than one tenth of the amount of sodium in the small particle size range. Furthermore, while results for one coal supported a silicon vaporization/nucleation mechanism governing formation of small particles, those for the other coal did not." @default.
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- W2051752685 date "1989-01-01" @default.
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- W2051752685 title "Quench-induced nucleation of ash constituents during combustion of pulverized coal in a laboratory furnace" @default.
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- W2051752685 doi "https://doi.org/10.1016/s0082-0784(89)80030-x" @default.
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