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Char Produced from Waste and Biomass Blended Pellets: Comprehensive Thermochemical Behavior Assessment
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Orientador(es)
Resumo(s)
The growing demand for carbon-based energy materials requires sustainable alternatives
to fossil fuels. This study explored the production and characterization of char obtained
from refuse-derived fuel (RDF) and biomass blended pellets in varying proportions (0%,
15%, 25%, 50%, and 100% RDF). The objective was to evaluate their potential as highenergy-density solid fuels while addressing operational challenges related to ash behavior.
Chars were produced at 400 ◦C for one hour in a muffle furnace in closed crucibles. A
set of analytical techniques (calorimetry, infrared spectroscopy, thermogravimetry, inductively coupled plasma, and X-ray fluorescence) was employed to assess physicochemical
properties. RDF content strongly affected mass yield, energy yield, and thermochemical behavior. Among the tested formulations, char with 50 and 25% of RDF (C_RDF50:BW50 and
C_RDF25:BW75) ignited at lower temperatures (≈150 ◦C) and showed high flammability
(C) values (1.97–2.03 × 10−5
), indicating greater flammability. They also reached higher
combustion temperatures (716–746 ◦C), suggesting improved thermal stability during the
final combustion stage. Both chars presented increased high heating values (18–19 MJ/kg,
dry basis) and a few surface functional groups. This supports a lower devolatilization rate,
meaning that although ignition is easy, combustion remains stable and controllable. All
chars showed very high acid–base indices, indicating a strong tendency for ash melting.
However, low slag viscosity and alkalinity values suggest viscous, poorly mobile slag, reducing adhesion and buildup on reactor surfaces. This study combines thermogravimetric
combustion analysis with ash chemistry–based slagging and fouling indices to provide an
integrated assessment of the operational behavior of RDF–biomass-derived char fuels. The
results highlight the technical feasibility of chars produced from RDF and biomass blended
pellets, whose thermal properties make them promising candidates for use as solid fuels.
Descrição
Palavras-chave
refuse-derived fuel chars combustion behavior