Changes in the physical, mechanical, chemical and energy parameters of coffee husk pellets during short-term storage

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60460709%3A41310%2F25%3A101895" target="_blank" >RIV/60460709:41310/25:101895 - isvavai.cz</a>

Result on the web

<a href="https://doi.org/10.1016/j.fuel.2024.134191" target="_blank" >https://doi.org/10.1016/j.fuel.2024.134191</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.fuel.2024.134191" target="_blank" >10.1016/j.fuel.2024.134191</a>

Result language

angličtina

Original language name

Changes in the physical, mechanical, chemical and energy parameters of coffee husk pellets during short-term storage

Original language description

Coffee husks are waste in the coffee roasting process, constituting about 12 % of the mass of the beans, generating a significant burden on the environment if they are not correctly disposed of. Pellets made from them can be sold or burned in the manufacturing plant. The justification for the undertaken research was to indicate the period after production of the agglomerate to obtain good technical and energetic quality. The research material in the form of unprocessed and pressure-agglomerated husks was obtained from a coffee roastery in Poland. The pellets were tested over 11 weeks, on the 3rd, 10th, 17th, 23rd, 52nd, and 78th day after their production. The aim of the study was to evaluate changes in parameters with significance for short-term storage (no longer than 2-3 months), transport and combustion. The changing moisture content of the pellet, which is more intense in the first days after its production, affects the physical and mechanical properties of the pellet produced; with time after its production, the unit and bulk density of the pellet increases. At the same time, intermolecular bonds become more robust, and the pellet is more complex and more resistant to external factors. The pellet acquires good properties after approx. two weeks from production, it is possible to transport and store it, and it becomes resistant to moisture absorption. The examined pellets were initially characterized by high moisture content (over 40 %, which declined during storage to approx. 7 %), an average bulk density of over 400 kg m-3, a unit density of approximately 850 kg m-3, and a mechanical durability of 96.5 %. As regards compressive strength, a decrease in the axial direction and an increase in the radial direction were observed in the tested pellets over time and with decreasing moisture content. In both cases compressive strain decreased.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

20704 - Energy and fuels

Project

—

Continuities

S - Specificky vyzkum na vysokych skolach

Publication year

2025

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

FUEL

ISSN

0016-2361

e-ISSN

0016-2361

Volume of the periodical

386

Issue of the periodical within the volume

APR 15 2025

Country of publishing house

CZ - CZECH REPUBLIC

Number of pages

16

Pages from-to

1-16

UT code for WoS article

001407555000001

EID of the result in the Scopus database

2-s2.0-85214004687