Juliusz Topolnicki's research while affiliated with Polish Academy of Sciences and other places
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Publications (12)
Gas-induced geodynamic phenomena can occur during underground mining operations if the porous structure of the rock is filled with gas at high pressure. In such cases, the original compact rock structure disintegrates into grains of small dimensions, which are then transported along the mine working space. Such geodynamic events, particularly outbu...
In this paper issues concerning the evaluation of the kinetics of gas release from coal samples were systematised. Our own analytical solution was presented. Diffusion equation was solved numerically. The numerical solution of Fick's formula taking into account of the Langmuir isotherm was compared with the analytical solution based on the Henry is...
The necessity to reduce the increasing amounts of carbon dioxide (CO2) in the atmosphere entails searching for some effective methods that enable safe storage of the gas in question. A method known as enhanced coal bed methane recovery (ECBM), involving injection of CO2 into unexploited coal beds, makes it possible to obtain CH4, too. The ECBM meth...
The article presents findings of a study on CO2/CH4 exchange sorption taking place in a coal briquette, initiated by the injection of a CO2 into a briquette that was previously saturated with CH4. The briquette was subjected to multiple cycles consisting of vacuum outgassing, CH4 saturation under 10 bar pressure, and an exchange sorption process. I...
The paper presents the study of CO2/CH4 exchange sorption in a coal briquette. The briquette was formed inside a heavy-walled steel pipe that served the purpose of a measuring chamber. The briquette with a porosity of 8.3%, a diameter of 0.096 m and a length of 0.280 m was used. Three laboratory experiments were conducted. The experiments consisted...
This paper concerns the dynamometer with magnetoelectric actuator. Its construction and functionality were described. The conducted tests allow to estimate a number of metrological parameters of the dynamometer. Several practical applications together with their results were shown.
Certain laboratory tests require a gas source with a stable pressure. Commercially available gas pressure regulators address the above requirement. However, the accuracy of these devices is often insufficient and what is more, the market offer of accurate gas pressure regulators is limited. Moreover, the commercially available gas pressure regulato...
W pracy przedstawiono krótką analizę naprężeń gazowych, które powstają w brykietach węglowych podczas eksperymentów laboratoryjnych polegających na prowokowaniu miniwyrzutów. Za materiał badawczy posłużyła próba węglowa pobrana z kopalni „Zofiówka”, a użytym gazem był azot. Obok analizy porównawczej wyznaczonych maksimów globalnych naprężeń gazowyc...
This article introduces a project and some specifications of the capillary flow meter. The functioning of the presented flow meter is based on the measurement of pressure drop caused by the gas flowing through the capillary. The article includes in detail a description of the calibration process of the above-mentioned measuring device and presents...
A designed and constructed low cost dislocation sensor based on differential capacitor is described in this paper. Measurement methodology of several metrological properties of dislocation sensor was applied successfully and the results of these measurements are presented. Measurements were conducted in dislocation range of 3–6000 nm. Linearity of...
The paper presents the results of studies on stationary gas seepage in coal briquettes of variable porosity. The measurement procedures are presented. Interpretation of the results is based on Darcy's law and two phenomenological formulae. Standard deviation from the plotted line representing the relationship between the real volumetric flow rate,...
Citations
... Quantitative analysis of gas energy requires understanding the type of thermodynamic transformation involved in the outburst process. Whether an outburst is adiabatic or isothermal has been widely debated over the past few decades Jin et al. 2018;Koziel et al. 2020Koziel et al. , 2021Lei et al. 2020;Skoczylas and Ijrmms 2012). The adiabatic process means that the gas cooled during decompression remains at a significantly lower temperature than the surrounding coal/rock throughout the process. ...
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... As a result, methane sorption or desorption kinetic properties are evaluated, which (as equivalent processes) are dictated by the value of the effective diffusion coefficient D e . This coefficient provides important information about the porous structure of coal and the gas transfer mechanisms within a seam [36]. Pressure, temperature [37,38] and moisture content [39] have a significant impact on the value of D e . ...
... For instance, the manostat was used to supply the system with a stable gas pressure for the study of carbon dioxide seepage [3]. Moreover, the manostat was also used for sorption measurements in porous media [4]. ...
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... In the case of coal, the mechanisms responsible for an outburst initiation and transportation of the outburst mass are broadly described (Topolnicki et al., 2004;Wierzbicki & Młynarczuk, 2006;Skoczylas, 2014;Sobczyk, 2014;Tian et al., 2016). The pore pressure of methane, along with coal's tensile strength, determine the energy of outburst initiation (Li-ming & Xue-xi, 2011). ...
... Interest in the sorption properties of coal under in situ conditions has grown in recent years in connection with studies which analysed the behavior of coal during CO 2 injection into deep, unmined coal seams with simultaneous CH 4 recovery (CO 2 -ECBM technology). Studies of CO 2 /CH 4 exchange sorption on coal are also being conducted at the Strata Mechanics Research Institute of the Polish Academy of Sciences (Dutka et al., , 2012Topolnicki et al., 2013). ...
![[object Object]](https://i1.rgstatic.net/ii/profile.image/804748647219201-1568878437743_Q64/Barbara-Dutka-2.jpg)
... Interest in the sorption properties of coal under in situ conditions has grown in recent years in connection with studies which analysed the behavior of coal during CO 2 injection into deep, unmined coal seams with simultaneous CH 4 recovery (CO 2 -ECBM technology). Studies of CO 2 /CH 4 exchange sorption on coal are also being conducted at the Strata Mechanics Research Institute of the Polish Academy of Sciences (Dutka et al., , 2012Topolnicki et al., 2013). ...
... These papers discuss tests performed under stationary conditions only and do not provide any results related to the analysis of the process course or changes occurring during CO 2 /CH 4 sorption exchange. The analysis of the course of the process of CO 2 /CH 4 exchange sorption is the subject of only a few studies (Jessen et al., 2008;Shi et al., 2008;Wang et al., 2010;Liang et al., 2011;Bhowmik and Dutta, 2011;Dutka et al., 2013). ...
... Various researchers designed and fabricated the dynamometers with the strain gauge for measuring the cutting force during turning and milling process up to a maximum of 4500 N with a sensitivity of ± 5 N and a cross sensitivity error of less than 1 % [16][17][18][19][20][21][22][23][24][25]. The metrological characteristic of simple square ring shaped force transducer was studied analytically and computationally [26]. ...
... Although high-cost gas flow sensors are commercially available, many studies have presented low-cost solutions to measure (automatically) the rate and volume of gas on a small laboratory bench scale [6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23]. Most of these solutions are based on connecting the outlet of the bioreactor to a three-way valve, which in turn is connected to a * Corresponding author. ...
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... For test rigs with more stringent criteria, highly accurate mass flow controllers with built-in control algorithms are employed to provide the desired flow [12,44,45]. In terms of pressure control, various devices have been used in different test rigs in order to maintain the working pressure at the target level with precision [46]. Commercial pressure regulators [47][48][49] and electrically driven butterfly valves [50] are the most typical devices installed at the outlet of pressurized test rigs to control the system backpressure. ...
