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- W2364284905 abstract "Coal technologies are changing in order to burn coal more cleanly. Many combustion and post-combustion technologies are developed to remove SO2 and NOx gases, particulate matter during combustion, or from flue gases leaving furnace. This paper focuses on three types of fly ash (flue gas desulfurization (FGD) residuals, atmospheric fluidized bed (AFBC) residuals and sorbent duct injection (SDI) residuals) which produced by the clean combustion and post-combustion technologies. The residuals formed by FGD are PCFA (pulverized coal fly ash) grains entrained with reacted and unre-acted sorbent and have lower bulk densities than PCFA grains because it contains higher concentrations of calcium and sulfur, and lower concentrations of silicon, aluminum and iron than PCFAs. AFBC residuals consist of spent bed which is a heterogeneous mixture of coarse-grained bed material and irregularly shaped, unfused, spherical PCFAs. The main crystalline phases in AFBC residuals are anhydrite (reacted sorbent), quartz and lime (unreacted sobent), calcite, hematite, periclase, magnetite and feldspars. The residuals produced by SDI contained 65%-70% PCFA with larger sizes material being irregularly shaped, fused or rough-edged. The reaction products of sorbent (portlandite and lime) included calcium sulfate (anhydrite) and calcium sulfate. The chemical properties of these residuals are similar to those of high calcium PCFAs because of high alkalinity and high pH of these residuals." @default.
- W2364284905 created "2016-06-24" @default.
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- W2364284905 date "2004-01-01" @default.
- W2364284905 modified "2023-09-25" @default.
- W2364284905 title "Mineralogy of clean coal combustion by-products" @default.
- W2364284905 hasPublicationYear "2004" @default.
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