ORIGINAL PAPER
Petrographic composition of char from the gasification of coal from the Wieczorek Mine after combustion
1
AGH University of Science and Technology, Faculty of Geology, Geophysics and Environmental Protection
Submission date: 2019-02-27
Final revision date: 2019-04-20
Acceptance date: 2019-06-28
Publication date: 2019-06-28
Corresponding author
Natalia Maciejończyk
AGH University of Science and Technology, Faculty of Geology, Geophysics and Environmental Protection
AGH University of Science and Technology, Faculty of Geology, Geophysics and Environmental Protection
Gospodarka Surowcami Mineralnymi – Mineral Resources Management 2019;35(2):69-86
KEYWORDS
coal gasificationchar petrographyfluidized bed gasificationbottom and fly ashfluidized bed combustion
TOPICS
ABSTRACT
The aim of the paper is the petrographic characterization of coal from the Wieczorek mine and
the residues after its gasification. The coal was subjected to gasification in a fluidized bed reactor at
a temperature of about 900°C and in an atmosphere of oxygen and CO2. The petrographic, proximate,
and ultimate analysis of coal and char was performed. The petrographic composition of bituminous
coal is dominated by macerals of the vitrinite group (55% by volume); macerals of inertinite and liptinite
groups account for 23% and 16.0%, respectively. In the examined char, the dominant component
is inertoid (41% vol.). Mixed dense and mixed porous account for 10.9% and 13.5% vol., respectively.
In addition, the examined char also contained unreacted particles such as fusinoids, solids (11.3% vol.),
and mineroids (5.1% vol.). The char contains around 65% vol. of low porosity components, which
indicates a low degree of carbon conversion and is associated with a low gasification temperature.
The char was burned and the resulting bottom and fly ashes were subjected to petrographic analysis.
Their composition was compared with the composition of ashes from the combustion of bituminous
coal from the Wieczorek mine. Bottom ashes resulting from the combustion of bituminous coal
and char did not differ significantly in the petrographic composition. The dominant component was
mineroid, which accounted for over 80% vol. When it comes to fly ash, a larger amount of particles
with high porosity is observed in fly ash from bituminous coal combustion.
METADATA IN OTHER LANGUAGES:
Polish
Skład petrograficzny karbonizatu ze zgazowania węgla z kopalni Wieczorek i popiołów po jego spaleniu
zgazowanie węgla, petrografia karbonizatu, zgazowanie w reaktorze fluidalnym, popiół denny i lotny, spalanie w złożu fluidalnym
Celem postawionym w poniższej pracy była charakterystyka petrograficzna węgla z kopalni Wieczorek
oraz pozostałości po jego zgazowaniu. Węgiel poddano zgazowaniu w reaktorze fluidalnym
w temperaturze około 900°C oraz w atmosferze tlenu i CO2. Wykonano analizy petrograficzne, technologiczne
i chemiczne węgla i karbonizatu. W składzie petrograficznym badanego węgla kamiennego
przeważały macerały z grupy witrynitu (55% obj.), z kolei macerały z grupy inertynitu i liptynitu
stanowiły odpowiednio 23 i 16,0% obj. W badanym karbonizacie dominującym składnikiem był inertoid (41% obj.). Składniki zaliczane do typów mixed dense i mixed porous stanowiły odpowiednio
10,9 i 13,5% obj. Ponadto, badany karbonizat zawierał cząstki nieprzereagowane, takie jak fusinoid
i solid (11,3% obj.) oraz mineroid (5,1% obj.). W karbonizacie znajdowało się około 65% obj. składników
o niskiej porowatości, co wskazuje na niski stopień konwersji węgla i jest związane z niską
temperaturą zgazowania. Następnie karbonizat poddano spalaniu, a powstałe popioły denne i lotne
były przedmiotem badań petrograficznych. Porównano ich skład ze składem popiołów ze spalania
węgla kamiennego z kopalni Wieczorek. Popioły denne ze spalania karbonizatu i węgla kamiennego
nie różniły się znacząco pod względem składu petrograficznego. Ich dominującym składnikiem był
mineroid, który stanowił ponad 80% obj. W przypadku popiołów lotnych, większa liczba cząstek
o dużej porowatości była obserwowana w popiołach pochodzących ze spalania węgla kamiennego.
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