Rate Limitations of Lime Dissolution into Coal Ash Slag

Autor:	John H. Patterson, H.J. Hurst, Terry Wall, Liza K. Elliott, John Lucas, Jim Happ
Rok vydání:	2008
Předmět:	Chemistry General Chemical Engineering Diffusion Metallurgy Energy Engineering and Power Technology Slag Mineralogy engineering.material complex mixtures Boundary layer Fuel Technology Phase (matter) Fly ash visual_art Pellet engineering visual_art.visual_art_medium Dissolution Lime
Zdroj:	Energy & Fuels. 22:3626-3630
ISSN:	1520-5029 0887-0624
DOI:	10.1021/ef700261h
Popis:	The rate-limiting mechanisms of lime dissolution from a solid pellet into coal ash slag and synthetic slag was investigated using an experiment involving a rotating cylinder of lime in a liquid slag bath at temperatures of 1450−1650 °C. Scanning electron microscopy (SEM) analysis of the slag composition around the lime cylinder was used to determine the nature of the boundary layer surrounding the pellet and the calcium concentration profile. Predictions using shrinking core models of a cylindrical pellet were compared to experimental results, suggesting that diffusion through the slag boundary layer and the change of the phase of lime from solid to liquid in the boundary layer combine to limit the process. These results indicate that a combination of controlling steps: diffusion through the boundary layer and the phase change of lime from solid to liquid, must be considered when predicting lime dissolution rates.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::6b2d5665199516a7aa272fec7c6e9f2d https://doi.org/10.1021/ef700261h Zobrazit plný text záznamu