Ash Transformation during Single-Pellet Combustion of Agricultural Biomass with a Focus on Potassium and Phosphorus

نویسندگان

چکیده

In this study, ash transformation and release of critical ash-forming elements during single-pellet combustion different types agricultural opportunity fuels were investigated. The work focused on potassium (K) phosphorus (P). Single pellets poplar, wheat straw, grass, grain residues combusted in a macro-thermogravimetric analysis reactor at three furnace temperatures (600, 800, 950 °C). order to study the inorganic matters stages thermal conversion process, collected before after full devolatilization, as well complete char conversion. residual char/ash was characterized by scanning electron microscopy–energy-dispersive X-ray spectroscopy, diffraction, inductively coupled plasma, ion chromatography, interpretation results supported thermodynamic equilibrium calculations. During representing Ca–K-rich woody energy crop, main fraction K remained primarily form K2Ca(CO3)2 lower K–Ca-rich carbonate melt higher temperatures. Almost all P retained mainly present hydroxyapatite. For Si–K-rich biomass with minor (wheat straw) or moderate (grass) content, mostly silicates. general, almost both K–Ca–P–Si-rich amorphous structures, possibly phosphosilicate-rich melts, crystalline forms hydroxyapatite, CaKPO4, calcium phosphate silicate. grain, K–P-rich fuel, K–Mg-rich phosphates. showed that general for studied fuels, occurred devolatilization stage, while combustion. Furthermore, less than 20% 35% released highest temperature fuels.

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ژورنال

عنوان ژورنال: Energy & Fuels

سال: 2021

ISSN: ['1520-5029', '0887-0624']

DOI: https://doi.org/10.1021/acs.energyfuels.0c03324