Characterization of Fly Ashes from Circulating Fluidized Bed Combustion (CFBC) Boilers Cofiring Coal and Petroleum Coke

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• 作者：Feihu Li ; Jianping Zhai ; Xiaoru Fu ; and Guanghong Sheng
• 刊名：Energy & Fuels
• 出版年：2006
• 出版时间：July 2006
• 年：2006
• 卷：20
• 期：4
• 页码：1411 - 1417
• 全文大小：483K
• 年卷期：v.20,no.4(July 2006)
• ISSN：1520-5029

文摘

The chemistry, mineralogy, morphology, and particle size distribution were investigated in fly ashes fromthe burning of Datong (ShanXi, China) bituminous coal and the cofiring of Mideast high-sulfur petroleumcoke (PC) with 30:70 (cal %) and 50:50 (cal %) blends of Datong bituminous coal in two commercial CFBCboilers. With the exception of CaO, the amounts of major oxides in the fly ashes from cofiring PC and coalwere close to those of the common coal fly ashes. The PC-coal fly ashes were enriched in Ni, V, and Mo,implying these trace elements were mainly derived from PC. Ni and V, along with several other elements,such as Cr, Cu, Se, Pb, U, Th, and possibly As and Cd, increased in content with a decrease in temperatureof the electrostatic precipitator (ESP). The results of chemistry, mineralogy, and morphology studies suggestedthat the desulfurization rate of the CFBC boilers at current conditions was low, and the PC tends to coarsenthe fly ash particles and increase the loss on ignition (LOI) values, making these fly ashes unsuitable for useas a cement additive or a mineral admixture in concrete. Further studies on the combustion status of the CFBCboilers are needed if we want to be able to increase the desulfurization rate and produce high-quality fly ashesfor broader and full utilization.