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- W155233469 abstract "The report discusses physical and chemical processes and reaction mechanisms for lime spray drying and dry injection of sodium compounds in dry flue gas desulfurization (FGD) processes. It includes: chemical reactions, physical changes, proposed reaction mechanisms and mathematical models, process parameters affecting reactions and their rates, and data needed to verify proposed reaction mechanisms and models. Published technical papers were the primary reference sources. The report focuses on coal-fired boiler dry FGD applications. Lime spray drying reactions are primarily gas/liquid-phase reactions, with SO/sub 2/ removal depending on moisture in the lime slurry droplet. Initially, the moisture content is high, and the reaction rate is controlled by diffusion of SO/sub 2/ to the droplet surface; most SO/sub 2/ removal occurs during this phase. As evaporation reduces the moisture, the dissolution of Ca(OH)/sub 2/ into ions limits the SO/sub 2/ removal rate. Later, the precipitation of CaSO/sub 3/.1/2 H/sub 2/O onto the surface of the lime particles retards diffusion of SO/sub 2/ to the unreacted sorbent. Injecting sodium compound powders into flue gas removes SO/sub 2/ via gas/solid reactions. First, NaHCO/sub 3/ is thermally decomposed to Na/sub 2/CO/sub 3/ (small pores in the sorbent particles increase the particles' surface area and reactivity).more » Then the SO/sub 2/ reacts with Na/sub 2/CO/sub 3/ to form Na/sub 2/SO/sub 3/, starting at the particle surface.« less" @default.
- W155233469 created "2016-06-24" @default.
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- W155233469 date "1982-04-01" @default.
- W155233469 modified "2023-09-27" @default.
- W155233469 title "Mechanisms of dry SO/sub 2/ control processes. Final report Sep 80-Sep 81" @default.
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