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The phosphorus and potassium contents of the char obtained from thermal conversion of forest residues can limit its utilization as an alternative fuel and reducing agent to substitute coal/coke in the steelmaking industry. In this study, ash transformation and release of K and P during single-pellet thermal conversion of different types of forest residues (i.e., bark, twigs, and bark+twigs) were investigated with the aid of a vertical tube furnace (Macro-TGA) at different temperatures (i.e., 600, 800, and 950 degrees C) and within and after different fuel conversion stages, i.e., devolatilization and char gasification. The residual char before and after full devolatilization, and ash after char gasification were characterized by SEM-EDS, XRD, and ICP-OES with the support of thermochemical equilibrium calculations. The concentrations of K (7970-19500 mg/kg) and P (1440-4925 mg/kg) in the char produced after devolatilization were more than four times higher than in coke and pulverized coal frequently used in metallurgical processes. A low amount of P and K (

Nyckelord

Char; Forest residues; Ash transformation; Potassium; Phosphorus; Thermal conversion; Macro-TGA; Single pellets

Publicerad i

Biomass and Bioenergy
2021, volym: 150, artikelnummer: 106124
Utgivare: PERGAMON-ELSEVIER SCIENCE LTD

SLU författare

Globala målen (SDG)

SDG7 Hållbar energi för alla

UKÄ forskningsämne

Bioenergi

Publikationens identifierare

  • DOI: https://doi.org/10.1016/j.biombioe.2021.106124

Permanent länk till denna sida (URI)

https://res.slu.se/id/publ/112754