Development of strain of coal subjected to sorption-desorption processes
Gospodarka Surowcami Mineralnymi – Mineral Resources Management 2007;23(Zeszyt specjalny 1):41-50
KEYWORDS
hard coalsorption CO2desorption CO2CH4strains of coal during sorption proccesesstrains of coal during desorption procceses
ABSTRACT
The paper reports results of experiments concerning the sorption/desorption processes accompanied by dilatation measurements conducted on block samples of coal (20 x 20 x 40 mm). Swelling/shrinkage of coal which occurs during sorption of gases (CO2, CH4) is a well-known phenomenon. Those changes of the external dimensions, for example during CO2 sequestration in geological strata containing coal, may lead to changes in its permeability. The concept of this study was based on the assumption that experiments conducted on lump samples, in comparison with those performed on grain size fractions, may reveal significant informations to provide a better understanding of CO2 behavior during sequestration process. Results of the experiments show that natural porosity of coal, which results from its maceral composition, has an influence on interactions between coal and gases. In case of lump samples free gas stored in coal cleats and cracks is responsible for a sample contraction and at the same time makes the diffusion into and out of pores more difficult.
METADATA IN OTHER LANGUAGES:
Polish
Rozwój odkształceń węgla kamiennego w procesach sorpcyjno-desorpcyjnych
węgiel kamienny, sorpcja CO2 i CH4, desorpcja CO2 i CH4, odkształcenia próbek węgla, proces sorpcji
W pracy przedstawiono wyniki badań sorpcyjnych i dylatometrycznych wykonanych na blokowych próbkach węgla kamiennego (20 x 20 x 40 mm). Powszechnie znane jest zjawisko pęcznienia/kontrakcji węgli towarzyszące procesom sorpcyjnym gazów (CO2, CH4). Te zmiany objętościowe np. w trakcie sekwestracji CO2 w utworach węglonośnych mogą wpływać na zmiany ich przepuszczalności. Koncepcja pracy opiera się na założeniu, że badania prowadzone na kawałkowych próbkach, w porównaniu z badaniami na próbkach ziarnowych, mogą dostarczyć informacji istotnych dla pełniejszego poznania zachowania się CO2 w procesie jego sekwestracji. Uzyskane wyniki wskazują, że na oddziaływania węgiel-gaz ma wpływ naturalna porowatość węgla wynikająca z jego składu maceralnego. W przypadku kawałkowych prób gaz wolny zgromadzony w pęknięciach i szczelinach węgla odpowiedzialny jest za skurcz próbki, który utrudnia dyfuzję do i z porów sorpcyjnych.
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| eISSN: | 2299-2324 |
| ISSN: | 0860-0953 |
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