Abstract
Integrated Gasification Combined Cycle used in power and chemical production is considered a clean technology, with the ability to capture almost all CO2, NOx, and SOx emissions. In entrained bed slagging gasifiers, molten slags formed from feedstock’s non-volatile impurities contribute to gasifier liner degradation and can cause gasifier clogging, affecting system efficiency and operation. Increased petcoke use as a key feedstock in addition to or as a replacement for coal has drastically modified slag chemistry, leading to unknown chemical/physical slag properties and behavior in the gasifier. In this work, thermodynamic phase equilibria in synthetic slags (Al2O3-CaO-FeO-SiO2-V2O3) were evaluated under simulated gasifier conditions to establish an understanding of the phase equilibrium in these slag systems. The effects of V2O3 content, slag chemistry, and additives on amorphous and crystalline phases were studied. In this study, increasing calcium oxide and iron oxide additive agents was found to lower the slag melting temperature and caused the karelianite (V2O3) crystal size to increase. Equilibrium phase diagrams showing the additive effect on the mixed coal-petcoke slag systems studied were constructed.
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Nakano, J., Duchesne, M., Bennett, J., Kwong, KS., Nakano, A. (2015). A Thermodynamic Study of Mixed Carbon Feedstock Gasification Slags. In: Jha, A., et al. Energy Technology 2015. Springer, Cham. https://doi.org/10.1007/978-3-319-48220-0_1
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DOI: https://doi.org/10.1007/978-3-319-48220-0_1
Publisher Name: Springer, Cham
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