Wyniki wyszukiwania - BazTech

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Izosteryczne ciepło sorpcji metanu na wybranych węglach kamiennych

Wierzbicki Mirosław, Pajdak Anna, Baran Paweł, Zarębska Katarzyna

Przemysł Chemiczny

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2019

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T. 98, nr 4

625--629

PL

Przedstawiono wyniki badań sorpcyjnych metanu na dwóch węglach kamiennych oznaczonych symbolami AN i BR. Badania strukturalne wykazały, że objętość mezoporów w węglu AN wyniosła 1,27 mm³/g, a w węglu BR 2,3 mm³/g. Objętość mikroporów w węglach wyniosła odpowiednio 43,1 mm³/g i 41,2 mm³/g, a powierzchnia właściwa mikroporów była w zakresie 92,9-94,9 m²/g. Analizy sorpcyjne CH₄ w temp. 298 K i 308 K pod ciśnieniem do 2,5 MPa wykazały spadek pojemności sorpcyjnej ze wzrostem temperatury, w węglu AN o 0,06 mmol/g, a w węglu BR o 0,11 mmol/g. W węglu AN izosteryczne ciepło sorpcji wyniosło 28,3-31,3 kJ/mol, a w próbce BR 11,6&-14,0 kJ/mol. Wartości pracy desorpcji i ekspansji pod ciśnieniem 2,5 MPa dla węgli AN i BR wyniosły odpowiednio 0,88 kJ/kg i 1,54 kJ/kg, oraz 0,64 kJ/kg i 1,27 kJ/kg.

EN

Two types of coal with different degrees of coalification were used to study the effect of their chem. compn. on sorption properties. Contents of volatile parts and elemental C in the coals were 29.2% and 86.4% and 40.9% and 79.6%, resp. Both coal types were used sep. to measure MeH sorption at 298 and 308 K and variable pressure conditions under 0-2.5 MPa. Based on the obtained isotherms, isosteric heats of MeH sorption were detd. They were 28.3-31.3 kJ/mol and 11.6-14.0 kJ/mol, resp.

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Acoustic emission and sorptive deformation induced in coals of various rank by the sorption-desorption of gas

Majewska Z., Ziętek J.

Acta Geophysica

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2007

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Vol. 55, no. 3

324-343

EN

Simultaneous measurements of acoustic emission (AE) and expansion/ contraction of coal samples subjected to gas sorption-desorption processes were conducted on high- and medium-rank coal. The aim of this study was to examine the influence of the coal rank and type of sorbate on measured AE and strain characteristics. The experimental equipment employed in this study consisted of a pressure vessel and associated pressurisation and monitoring units. The arrangement of pressure-vacuum valves permitted the coal sample to be pressurised and depressurised. Carbon-dioxide and methane were used as sorbats. Acoustic emission and strains were recorded continuously for a period of 50 hours during sorption and for at least 12 hours during the desorption process. Tests were conducted on cylindrical coal samples at 298 K. The experimental data were presented as plots of AE basic parameters versus time and in strain diagrams. These studies lead to the following conclusions: 1. There are significant differences in AE and strain characteristics for the two sys-tems (coal-CO2 and coal-CH4); 2. There is a direct influence of rank and type of coal on its behaviour during the sorption-desorption of gas. An attempt has been made to interpret the results obtained on the grounds of the copolymer model of coal structure. More research is needed into this topic in order to get a quantitative description of the observed facts.

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Zależność pojemności sorpcyjnej węgla kamiennego dla metanu od składu petrograficznego węgla (Górnośląskie Zagłębie Węglowe)

Jurczak-Drabek A., Kwarciński J.

Zeszyty Naukowe. Górnictwo / Politechnika Śląska

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2003

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z. 257

75-84

PL

Na podstawie porównania wyników badań petrograficznych oraz pomiarów pojemności sorpcyjnych wykonanych na 10 próbach węgla pobranych z dwóch otworów wiertniczych stwierdzono zależność pojemności sorpcyjnej od zawartości sumy macerałów komórkowych (fuzynit + semifuzynit) oraz sumy mikrolitotypów (fuzyt + semifuzyt).

EN

There is asserted relationship between hard coal sorption capacity of methane and the aggregation of hard coal cellular macerals (fusinite + semifusinite) as well as aggregation of hard coal microlithotype (fusite + semifusite). The relationship is described as a result of laboratory (microscope) petrographic research work and sorption capacity measurements carried out with 10 samples of hard coal received from two boreholes.