Regenerative process for desulfurization of high temperature combustion and fuel gases. Quarterly progress report No. 5, April 1--June 30, 1977

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The sulfation rate of reagent-grade monocalcium silicate is of the same order of magnitude as that of limestone and higher than that of reagent-grade calcium oxide. It has been confirmed that the sulfated monocalcium silicate is more regenerable than the sulfated lime, i.e., the regeneration rate is higher with the silicate. X-ray diffraction and IR absorption results indicate that silica is chemically bonded to the calcium sulfate in the sulfated calcium silicate. Construction of a micro-pilot rotary kiln for regeneration of lime from the sulfated lime has been completed. The Brookhaven processes for regeneration using fly ash from FBC will … continued below

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28 pages

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Steinberg, M & Yang, R T January 1, 1977.

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The sulfation rate of reagent-grade monocalcium silicate is of the same order of magnitude as that of limestone and higher than that of reagent-grade calcium oxide. It has been confirmed that the sulfated monocalcium silicate is more regenerable than the sulfated lime, i.e., the regeneration rate is higher with the silicate. X-ray diffraction and IR absorption results indicate that silica is chemically bonded to the calcium sulfate in the sulfated calcium silicate. Construction of a micro-pilot rotary kiln for regeneration of lime from the sulfated lime has been completed. The Brookhaven processes for regeneration using fly ash from FBC will be tested with this device. Design and construction of a micro-combustor which will be used to test the regenerated lime are underway. Studies on sulfation of lime continue. Sodium chloride, although catalyzing the sulfation rate, yields too much chloride in the gas phase (60 percent NaCl at 900/sup 0/C), which can chlorinate the metals and metal oxides in the combustor. The catalysis by Fe/sub 2/O/sub 3/ and/or coal ash has been established and its mechanisms have been studied. Effects of the calcination conditions on sulfation are being studied. A process flow diagram for producing commercial strength sulfuric acid from regenerator off-gas has been prepared. The process would be used in conjunction with BNL's process for regenerating CaO from CaSO/sub 4/ using carbon as a reductant. A preliminary comparison between a once through sorbent system and the combined regenerative/H/sub 2/SO/sub 4/ system indicates that the net energy outputs (useful) of the two systems are approximately the same. The quantity of solid wastes generated by the once through system is about 2.5 times the quantity generated by the combined system.

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28 pages

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Dep. NTIS, PC A03/MF A01.

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  • January 1, 1977

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  • Feb. 4, 2018, 10:51 a.m.

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  • Jan. 26, 2021, 3:22 p.m.

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Steinberg, M & Yang, R T. Regenerative process for desulfurization of high temperature combustion and fuel gases. Quarterly progress report No. 5, April 1--June 30, 1977, report, January 1, 1977; Upton, New York. (https://digital.library.unt.edu/ark:/67531/metadc1068078/: accessed July 13, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.

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