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

Kód výsledku v 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>

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

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

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

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

Popis výsledku anglicky

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.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20704 - Energy and fuels

Projekt

—

Návaznosti

S - Specificky vyzkum na vysokych skolach

Rok uplatnění

2025

Kód důvěrnosti údajů

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

Název periodika

FUEL

ISSN

0016-2361

e-ISSN

0016-2361

Svazek periodika

386

Číslo periodika v rámci svazku

APR 15 2025

Stát vydavatele periodika

CZ - Česká republika

Počet stran výsledku

16

Strana od-do

1-16

Kód UT WoS článku

001407555000001

EID výsledku v databázi Scopus

2-s2.0-85214004687