Temat: koszt egzergetyczny - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Exergetic cost of steam power plant operation
Autorzy:: Budnik, M.
Stanek, W.
Powiązania:: https://bibliotekanauki.pl/articles/240012.pdf
Data publikacji:: 2011
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: egzergia
koszt egzergetyczny
urządzenie napędowe
exergetic cost
exergy
power plant
Opis:: The paper is devoted to the problems of exergetic cost determination. A brief description of theoretical fundamentals of exergetic cost determination and its application are presented. The applied method of calculations is based on the rules of determination of cumulative exergy consumption. The additional possibilities ensured by the exergetic cost analysis in comparison to the direct exergy consumption analysis are discussed. The presented methodology was applied for the analysis of in.uence of operational parameters on exergetic cost indices of steam power plant. Results of calculations concern one of the modern Polish power plant unit. Basing on the obtained results several conclusions have been formulated that show advantages of application of exergetic cost analyses.
Źródło:: Archives of Thermodynamics; 2011, 32, 2; 39-54
1231-0956
2083-6023
Pojawia się w:: Archives of Thermodynamics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Evaluation of the extractive gold process: open-pit mining through exergy analysis
Autorzy:: Velasquez, Hector I.
Orozco Loaiza, Carlos Andres
Hasenstab, Christian
Cano, Natalia A.
Powiązania:: https://bibliotekanauki.pl/articles/1839028.pdf
Data publikacji:: 2020
Wydawca:: Główny Instytut Górnictwa
Tematy:: exergy
exergetic cost
extractive gold process
open-pit mining
silver
gold
egzergia
koszt egzergetyczny
wydobycie złota
wydobycie odkrywkowe
srebro
złoto
Opis:: The Colombian mining sector is characterized by the production of coal, nickel, emeralds, gold, and construction materials. It is considered by the National Development Plan of Colombia 2018-2022 as an economic agent that boosts development in the region and one that requires the strengthening of its policies and environmental liability. Therefore, this paper aims to show the importance of implementing methodologies based on the logic of nature (exergy) that objectively indicate the environmental impact of an extractive gold activity, such as open-pit gold mining. The extractive activity or process to be studied consists of the following stages: topsoil removal by using machinery and explosives to create craters and to access the mineral present in the subsoil; the physical transformation of the extracted material through crushing, grinding, gravimetric separation, flotation, leaching, adsorption, elution, and electrodeposition, along with smelting and casting to obtain gold and silver ingots. Thus, this paper analyzes the exergy performance of each unit process of the open-pit extractive process. The obtained results are used in a sensitivity analysis, which determines the system efficiency, by assuming the increase of gold in the extracted material in the exploitation stage, by using the same supplies and input of the current process. In other cases, the open-pit mining process is analyzed by changing its technologies in the mining process and assuming that this change reduces the inlet ore to 60%, by discarding 40% of material without gold and by reducing supply consumption by 25%. By improving the system efficiency, the exergy destroyed is reduced and the emissions to the environment diminish. Therefore, this method may be implemented as a basic guideline when it comes to decision-making processes in the planning of the extractive processes by integrating the environmental component with gold production.
Źródło:: Journal of Sustainable Mining; 2020, 19, 3; 166-181
2300-1364
2300-3960
Pojawia się w:: Journal of Sustainable Mining
Dostawca treści:: Biblioteka Nauki

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