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Wyświetlanie 1-3 z 3
Tytuł:
Wykorzystanie wody dołowej w odbiorze i wykorzystaniu ciepła skraplania z podziemnych układów klimatyzacji w kopalniach
Using Underground Water for Condensation Heat Rejection and Recovery in UndergroundRefrigeration Plants of Mines
Autorzy:
Szlązak, Nikodem
Obracaj, Dariusz
Korzec, Marek
Powiązania:
https://bibliotekanauki.pl/articles/28756767.pdf
Data publikacji:
2023
Wydawca:
Polskie Towarzystwo Przeróbki Kopalin
Tematy:
zagrożenie klimatyczne
klimatyzacja kopalń
agregaty chłodnicze
ciepło skraplania
wykorzystanie ciepła odpadowego
harsh climate conditions
mine cooling systems
mine refrigerant plant,
ondensation heat
waste heat recovery
Opis:
Stosowanie różnych systemów chłodzenia powietrza w kopalniach podziemnych wynika z trudnych warunków klimatycznych panujących na stanowiskach pracy. Podziemne instalacje chłodnicze z agregatami sprężarkowymi są szeroko stosowane w systemach chłodzenia powietrza. Sprawne działanie agregatów chłodniczych zależy od właściwego odprowadzania ciepła skraplania. Moc chłodnicza i lokalizacja instalacji chłodniczej mają największy wpływ na podjęcie decyzji o odprowadzeniu ciepła skraplania do powietrza lub wody. W artykule skoncentrowano się na zastosowaniu urządzeń chłodniczych zabudowanych w wyrobiskach podziemnych. Przedstawiono rozważania dotyczące ograniczeń przekazywania ciepła skraplania do powietrza kopalnianego oraz warunki sprzyjające wykorzystaniu wody dołowej w odbiorze ciepła skraplania z układów klimatyzacji. Omówiono uwarunkowania i możliwości wykorzystania ciepła odpadowego zawartego w pompowanej na powierzchnię wodzie dołowej.
Using various air cooling systems in underground mines results from harsh climatic conditions at workplaces. Underground refrigeration plants with compressor chillers are widely used in air cooling systems. The efficient operation of refrigeration units depends on the proper condensation heat rejection. Cooling capacity and localization of a refrigeration plant have the most significant influence on deciding of rejecting condensation heat to air or water. The limitation of the heat rejection capacity of return air streams in a typical mine and conditions facilitative to using underground water from an underground mine dewatering system is presented. Determinants and opportunities for heat recovery from water discharged to the surface are also discu
Źródło:
Inżynieria Mineralna; 2023, 1; 225--234
1640-4920
Pojawia się w:
Inżynieria Mineralna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Influence of the Sample Preparation on the Result of Coal Propensity to Spontaneous Combustion in the High-temperature Adiabatic Method
Autorzy:
Obracaj, Dariusz
Korzec, Marek
Vu, Tien Tung
Powiązania:
https://bibliotekanauki.pl/articles/2020904.pdf
Data publikacji:
2021
Wydawca:
Polskie Towarzystwo Przeróbki Kopalin
Tematy:
spontaneous combustion of coal
propensity to spontaneous combustion
high-temperature method
węgiel
spalanie
metody
Opis:
The liability of coal to spontaneous combustion is the principal cause of mine fires. Spontaneous combustion is one of the main threats in Polish and Vietnamese coal mines. The article presents an analysis of the spontaneous combustion of coal in mines of both countries. It is related to the natural prone of coal to spontaneous heating and consequently to its self-ignition. Despite the relevant recognition of the methods of preventing this threat, in mines, spontaneous combustion occurs during the exploitation of coal seams with low and very high self-ignition tendency. Apart from the technical factors related to the design of coal seam mining, the properties of coal have a significant impact on the occurrence of spontaneous combustion. Their correct recognition is essential to the precautions against spontaneous combustion for minimalizing the risk of a mine fire. Therefore, it is necessary to study the factors influencing the propensity of coal to spontaneous heating. A review of the methods used to determine the propensity of coal to spontaneous combustion is presented in the article. Based on the high-temperature method of determining the propensity of coals to spontaneous combustion, the influence of selected factors related to samples' preparation for testing on the determination result was investigated. The influence of the fractional decomposition and the moisture content in the prepared samples on the determination result was demonstrated. The presented research results may improve research procedures for determining the propensity of coal to spontaneous combustion.
Źródło:
Inżynieria Mineralna; 2021, 2; 65--78
1640-4920
Pojawia się w:
Inżynieria Mineralna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Research on mine seal stability under explosion load and ground pressure in underground coal mines
Autorzy:
Cheng, Jianwei
Song, Wanting
Jing, Yi
Zhang, Xixi
Korzec, Marek
Borowski, Marek
Wang, Yue
Powiązania:
https://bibliotekanauki.pl/articles/218944.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
kopalnia węgla
symulacja numeryczna
dłutowanie
seals in underground coal mines
numerical simulation
slotting
ground pressure
roof to floor moving convergence
damage level
Opis:
The mine seals in coal mines with a good impact resistance and air tightness are mainly used to isolate abandoned mining areas from active workings. For one thing, it can prevent the leakage of harmful gases, such as toxic gas from abandoned areas. For another, once an underground mine explosion happens, it can effectively block the spread of the explosion between the abandoned mining areas and the active workings. Hence, it is of great significance to study the explosion-proof performance and mechanical properties of the mine seals. First of all, the effect of slotting on the stability of the seals in coal mines under explosion load was explored in this study. By numerical simulations, the mechanical response characteristics of the seals with or without cutting a slot under the explosion load were compared in detail. The results show that slotting improved the stress concentration at the contact surface of surrounding rock by transferring partial impact received by mine seals to the surrounding rocks, thus, to achieve the effect of buffering explosion impact. Besides, such effect will be enhanced with increasing cutting depth into rock, and will stabilize when the depth is 20 cm. On this basis, the mechanical properties and damage of the seals constructed by different materials (standard brick and #C40 concrete) under the explosion load were compared. It was found that once a slot was set, the maximum deformation of the concrete seal was reduced, while the maximum deformation of the brick seal increased. Since the non-deformability of the concrete seal is obviously stronger than that of the brick seal, with the impact resistance stronger than that of the brick seal, the concrete seal is more suitable for slotting. Moreover, the damage of the seals in underground coal mines under the strata ground pressure was studied; the results of which show that the damage state under the ground pressure can be divided into 3 levels, i.e. no damage, minor damage and rapid development of damage. Meanwhile, it was found that the prestressed structure fordem by the ground pressure at the level of no damage can enhance the protective effect of the seals in coal mines. However, when the ground pressure was further developed, the seal itself was destroyed and the protective effect was lost. In addition, the influence of roof to floor moving convergence, a deformation parameter of the roadway, on the seals was also investigated. The results show that the ground pressure and roof-to-floor convergence act on the seals in coal mines in the same way, thus roof to floor moving convergence can replace the ground pressure to analyze other related mechanical properties of the seals in coal mines in the future researches.
Źródło:
Archives of Mining Sciences; 2020, 65, 1; 71-87
0860-7001
Pojawia się w:
Archives of Mining Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-3 z 3

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