Compositions of Filter-Vessel and Cyclone "Ash" from Pressurized Fluidized Bed Combustion

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• 作者：Kal S. Seshadri and Duane H. Smith
• 刊名：Energy & Fuels
• 出版年：2000
• 出版时间：May 2000
• 年：2000
• 卷：14
• 期：3
• 页码：526 - 532
• 全文大小：85K
• 年卷期：v.14,no.3(May 2000)
• ISSN：1520-5029

文摘

Excessively hard filter cakes have occurred during filtration of fine particles from hot gases inpressurized fluidized bed combustion (PFBC) power plants in which dolomitic limestone wasused as the SO_x sorbent. These deposits forced premature plant shutdown and became a majorbarrier to successful development of the filtration technology. Our previous work implicated Mg₂Ca(SO₄)₃ as a chief cause of these excessive cake strengths, but no analytical technique wasavailable to quantitatively relate filter-cake physical properties and operating problems to Mg₂Ca(SO₄)₃ concentrations. Hence, a new Fourier transform infrared spectroscopy technique hasbeen developed to analyze for Mg₂Ca(SO₄)₃ in the presence of CaSO₄ and other compounds inPFBC samples. This technique was used to measure chemical compositions of various samplestaken from either the cyclone or the hot-gas filtration vessel of a PFBC demonstration powerplant. These measurements clarify and further demonstrate the critical role played by Mg₂Ca(SO₄)₃. Further measurements of the type described here should allow researchers to quantitatively determine how Mg₂Ca(SO₄)₃ concentrations in filter cakes depend on various operatingparameters (e.g., temperatures, pressures, and composition of the coal and sorbent), and thussolve problems that have prevented the successful development of hot-gas filtration for PFBCpower plants.