Analysis of coal structure in the aspect of gas content

• Autorzy: Niezgoda T. , Miedzińska D. , Małek E.
• Języki publikacji: EN

Abstrakty

EN

The problem of methane existence in coal beds has been known for many years. It was and still is a danger to coalminers. The aim of the research presented in the paper is to show and assess the porosity structure (especially micro and nanoporosity) in accordance to the dimensions of carbon dioxide particle. The characteristic surface morphology of the sample and the disclosure of carbon porous structure was obtain using the scanning electron microscope (SEM). The presented study of the coal microstructure is a part of the coal demethanation method with the use of liquid CO2, that was proposed by Military University of Technology. Based on the results of laboratory tests may be noted that the analyzed coal has a granular structure. It is also visible that that the structure is stratified, and there is a lot of cracks and free space between grains, which can accumulated methane in coal structure. The nanoporosity of the coal grains was observed during SEM study. The sizes and shapes of pores are miscellaneous. However the dimension of 62-300 nm allow to draw a conclusion, that the nanopores can contain a few particles of CH4 (4 A), which can be released by the CO2 particle (2.54 A). Finally, on the base of presented research it can be concluded that the method of coal demethanation with the use of CO2 can be economically and ecologically effective, and can increase the miners safety.

Słowa kluczowe

EN

carbon dioxide; methane; porosity of coal

• Wydawca: AGH University of Science and Technology Press
• Czasopismo: AGH Drilling, Oil, Gas
• Rocznik: 2013
• Tom: Vol. 30, no. 1
• Strony: 169--179
• Opis fizyczny: Bibliogr. 6 poz., rys., tab., zdj.

Twórcy

autor

Niezgoda T.

• Military University of Technology, Faculty of Mechanical Engineering, Department of Mechanics and Applied Computer Science, Warsaw

autor

Miedzińska D.

• Military University of Technology, Faculty of Mechanical Engineering, Department of Mechanics and Applied Computer Science, Warsaw

autor

Małek E.

• Military University of Technology, Faculty of Mechanical Engineering, Department of Mechanics and Applied Computer Science, Warsaw

Bibliografia

• [1] Enaney B. Mc, Mays T.J.: Characterization of micropores in carbons, w: Porosity in carbons: Characterization and applications. Ed J.W. Patrick, E. Arnold, London, 1995.
• [2] Melnichenko Y.B., He L., Sakurovs R., Kholodenko A.L., Blach T., Mastalerz M., Radliński A.P., Cheng G., Mildner D.F.R.: Accessibility of pores in coal to methane and carbon dioxide. Fuel, vol. 91, nr 1, 2012, 200-208.
• [3] Gonet A., Nagy S., Rybicki C., Siemek J., Stryczek S., Wiśniowski R.: Technologia wydobycia metanu z pokładów węgla. Górnictwo i Geologia, t. 5, z. 3, Kraków 2010, 5-25.
• [4] Bumb A.C. and McKee C.R.: Gas-well testing in the presence of desorption for coalbed methane and devonian shale. SPE Formation Evaluation, March 1988.
• [5] Hagoort J.: Fundamentals of gas reservoir engineering. Developments in Petroleum Science, vol. 23, Elsevier, Amsterdam, 1988; 328 pp. Dfl. 185.00, ISBN 0-444¬42991-3.
• [6] Harpalani S. and Schraufnagel A.R.: Influence of matrix shrinkage and compressibility on gas production from coalbed methane reservoirs. Paper SPE 20729, Proceedings of SPE Annual Technical Conference and Exhibition, September 1990.