Wyniki wyszukiwania - Biblioteka Nauki

1

Analiza wpływu jakości węgla na efektywność pracy kotła fluidalnego

100%

Wirth A. , Brodny J.

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2020

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tom Nr 1

42--50

PL

Czynnikiem mającym bardzo istotny wpływ na parametry pracy kotła fluidalnego jest jakość dostarczanego do niego węgla. W pracy dokonano analizy pracy bloku energetycznego opartego na nadkrytycznym kotle fluidalnym spalającym różne gatunki węgli energetycznych. Celem analizy była identyfikacja przyczyn zaniżeń mocy bloku, awarii układu podawania paliwa oraz ich zależność od rodzaju spalanych miałów energetycznych. Dokonano także porównania parametrów eksploatacyjnychbadanego kotła z wybranych dwóch miesięcy (letni i zimowy), z planami produkcyjnymi. Wstępna analiza wykazuje uzależnienie ilości wyprodukowanej energii elektrycznej od rodzaju i jakości spalanych paliw, a tym samym stopnia realizacji planu produkcji oraz kosztów wytwarzania. Docelowe ustalenie właściwego składu i jakości mieszanek paliwowych powinno umożliwić wydłużenie czasu pracy bloku. Powinno wpłynąć także na wzrost ilości produkowanej energii elektrycznej, obniżenie awaryjności układu podawania paliwa, a tym samym poprawę dyspozycyjności oraz obniżenie kosztów eksploatacji. Prezentowane wyniki stanowią pierwszą fazę prac, których celem jest określenie wpływu rodzaju węgla (jego parametrów) na wielkość i koszty produkcji energii elektrycznej. Dodatkowym celem analizy jest także identyfikacja ogniw o najmniejszej dyspozycyjności w układzie podawania paliwa wraz z określeniem przyczyntego stanu.

EN

The factor having a very significant impact on the performance parameters of a fluidized bed boiler is the quality of coal supplied to it. The paper analyzes the work of an power unit based on a supercritical fluidized bed boiler burning various types of energy coals. The purpose of the analysis was to identify the reasons for the reduction of the unit, failure of the fuel giving system and their dependence on the type of culm coal burned. A comparison of the operating parameters of the tested boiler from the selected two months (summer and winter) with production plans was also made. Preliminary analysis shows the dependence of the amount of electricity produced on the type and quality of fuels burned, and thus the degree of implementation of the production plan and production costs. Target determination of the correct composition and quality of fuel mixtures should allow extension of the unit's operating time. It should also increase the amount of electricity produced, reduce the failure of the fuel giving system, thereby improving availability and reducing operating costs. The presented results constitute the first phase of work aimed at determining the impact of the type of coal (its parameters) on the volume and costs of electricity production. An additional purpose of the analysis is also to identify the nodes with the lowest availability in the fuel giving system together with the reasons for this condition.

2

Analysis of dustiness state in a driven underground dog heading ventilating by auxiliary air-duct

100%

Brodny J. , Tutak M.

Management Systems in Production Engineering

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2020

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tom nr 2 (28)

73--77

EN

Dustiness of the mine atmosphere during carrying out exploitation is one of the most hazardous factors threaten to health and life of employees. Also it is large hazard for all type of mechanical and electrical devices operating in mining headings. Coal dust is also very dangerous due to its possibility of explosion. Currently applied technologies of rock mass mining process, entire transport process of output and applied ventilation system cause that rock and coal dust is presented practically in each of the mining heading. Practically, is impossible to eliminate dust from mining headings. However, one can determine its parameters and potential ways its displacement. In the paper there is presented modeling research methodology of dustiness state in a driven dog heading. Developed model is the basis for this methodology, including the diphase flow of mixture of air and dust in the mining heading. Analysis was performed for real driven dog heading. Based on performed analyses, distributions of particular fraction and movement trajectories of selected dust grains were determined. Developed methodology gives a lot of opportunities for analysis of dustiness state in mining headings and in other compartments. It enables to determine parameters of particular grains and their impact on ventilation parameters of the air stream in the tested headings. Obtained results can also be used to reduce dust hazard.

3

Availability Study of a Longwall Shearer Including Phases of its Operation

100%

Brodny J. , Brzana E.

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2021

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tom Vol. 4, Iss. 1

200--211

EN

The mining production process includes a number of sub-processes, the most important of which is mining the rock mass. In this process, increasingly modern mining machines are being used to replace human labor and to achieve high productivity. Full utilization of the potential of these machines is of great importance for the efficiency of individual stages and the whole process of mining production. In the process of mining the rock mass, the use of machinery of a mechanized longwall system is of fundamental significance. Their availability, efficiency and reliability significantly affect the efficiency of the whole mining production process. The paper refers to the availability of a longwall shearer as the basic machine of a mechanized mining system. Based on the analysis of diagnostic signals, recorded by the industrial automation system, the availability of the longwall shearer was determined for 10 selected cycles of its operation. The analysis also included the phases of these cycles, treated as separate periods of the shearer’s work. This division is a consequence of a great difference in the character of the shearer’s work in particular phases of the operating cycle. The analysis covered the phases of cutting, mining and shunting. The determined temporal waveforms and the shearer’s availability in these phases show their great diversity. Therefore, the results indicated the necessity to analyze the operation of mining machines in their characteristic periods, which can be the basis for minimizing unplanned interruptions in their operation and improving the efficiency of their use.

4

Forecasting the distribution of methane concentration levels in mine headings by means of model-based tests and in-situ measurements

100%

Brodny J. , Tutak M.

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tom Vol. 29, No. 1

25--39

EN

The methane hazard is one of the most dangerous phenomena in hard coal mining. In a certain range of concentrations, methane is flammable and explosive. Therefore, in order to maintain the continuity of the production process and the safety of work for the crew, various measures are taken to prevent these concentration levels from being exceeded. A significant role in this process is played by the forecasting of methane concentrations in mine headings. This very problem has been the focus of the present article. Based on discrete measurements of methane concentration in mine headings and ventilation parameters, the distribution of methane concentration levels in these headings was forecasted. This process was performed on the basis of model-based tests using the Computational Fluid Dynamics (CFD). The methodology adopted was used to develop a structural model of the region under analysis, for which boundary conditions were adopted on the basis of the measurements results in real-world conditions. The analyses conducted helped to specify the distributions of methane concentrations in the region at hand and determine the anticipated future values of these concentrations. The results obtained from model-based tests were compared with the results of the measurements in real-world conditions. The methodology using the CFD and the results of the tests offer extensive possibilities of their application for effective diagnosis and forecasting of the methane hazard in mine headings.

5

The role, importance and impact of the methane hazard on the safety and efficiency of mining production

80%

Palka D. , Brodny J. , Tutak M. , Nitoi D.

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tom Vol. 28, Iss. 4

390--397

EN

Underground mining production is an extremely important process for the economy and carried out in very difficult and complex environmental conditions. The disturbance of the balance of this environment makes it also a very dangerous process. Due to the importance of coal, mainly as an energy raw material, the process of its exploitation is carried out all over the world. The specificity of its production is mainly determined by mining and geological conditions, which determine the method of operation and the selection of machines and devices for this process. One of the most dangerous natural hazards associated with this process are ventilation hazards, including methane hazard. The reason for this threat is methane, an odorless and colorless gas, which becomes a flammable and explosive gas under certain criteria. These features make this gas a huge threat to mining operations. Its huge amounts, contained in coal seams, are released into the mine atmosphere during the exploitation process, causing a very high threat to work safety. Events related to the occurrence of methane are most often the cause of mining disasters, in which people die and the technical and mining infrastructure is destroyed. The reason for the growing methane hazard is the increasingly difficult mining conditions, and mainly the increasing depth of mining, and thus also the increase in methane-bearing capacity of the seams. Taking into account the huge impact of methane hazard on the mining process, the article discusses its impact on the safety and efficiency of this process. The results of the literature review with regard to this risk are presented and the accident statistics are presented. On the basis of actual data, an analysis of interruptions in the exploitation process related to exceeding the permissible me-thane concentrations was carried out in one of the mines. The problem of limiting the production process due to these exceedances is an important factor reducing the efficiency of this process. The obtained results clearly indicate that the losses resulting from these breaks deteriorate the profitability of the entire process and affect the economic efficiency of the industry. In order to effectively counteract the dangerous phenomena related to the methane hazard and to improve the efficiency of the mining production process, solutions were proposed to improve this state and the directions for further research were proposed.

6

Inter gases as one of the ways to reduce the risk of endogenous fires in hard coal mines

80%

Szurgacz D. , Sobik L. , Brodny J.

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2019

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tom Vol. 2, Iss. 1

183--190

EN

Endogenous fires are currently one of the most common threats in hard coal mines. They are very dangerous for the staff and can cause very large economical loses. Therefore, the scope of activities aimed at limiting the possibility of these fires and reduction of their consequences constantly broadens. The paper presents the results of research aimed at determining the efficiency of the ventilation system applied to reduce the risk of endogenous fires in the areas where inert gases are used. The calculations included carbon dioxide and nitrogen. Inertisation is one of the ways of combating endogenous fires. This method is included in the developed comprehensive method to reduce the possibility of these fires. The results obtained and the method developed and later applied, should have a significant impact on improving the safety of operations in the scope of occurrence and consequences of endogenous fires.

7

Economic aspects relating to machine operations on a mine main drainage system

80%

Korbiel T. , Czerwińska-Lubszczyk A. , Brodny J. , Czerwiński S.

Zeszyty Naukowe Akademii Morskiej w Szczecinie

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2022

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tom nr 72 (144)

122--130

EN

This article presents an economic analysis of the exploitation of the main mine drainage according to the condition of machines. The study is based on actual operating data obtained during the operation of an underground hard coal mine. Through the selection of state estimators, appropriate sensory systems, as well as a long-term economic approach, operating procedures were developed that allowed for the introduction of significant financial savings. Operating costs are reduced by lowering energy consumption and reducing the costs of current repairs and spare parts. In addition to the classic approach to monitoring the state of a machine, based on the observation of residual processes, a global coefficient, referred to as unit energy consumption, has been proposed. Thanks to this, the operation of the machine occurs not only on the basis of its current dynamic state, but also due to the control processes of the machine’s operation. Moreover, the article refers to the area related to water safety and the reliability of the pumping station.

8

Badania nieszczelności wewnętrznej stojaka zmechanizowanej obudowy ścianowej

80%

Szurgacz D. , Więcek P. , Brodny J.

Bezpieczeństwo Pracy i Ochrona Środowiska w Górnictwie

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2020

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tom nr 8

2--7

PL

W artykule przybliżono problematykę nieszczelności wewnętrznej występującej w stojakach hydraulicznych sekcji obudowy zmechanizowanej. Przedstawiono wyniki kilkuletnich prac nad opracowaniem nowego zastoso wania konstrukcji bloku zaworowego z dwoma zaworami zwrotnymi oraz zaprezentowano wyniki badań stano wiskowych i w warunkach rzeczywistych.

EN

A powered roof support is an integral element of a longwall complex while a hydraulic leg is the basie component of the support. The operating characteristics of the section, and then of the entire powered roof support, depend on its operating parameters and reliability. This also has a significant impact on the efficiency of the entire longwall complex. The correct operation of hydraulic leg is therefore of key importance to the mining process. One of the things that can disturb the work of the leg is internal leakage which negatively impacts on the performance of the leg. Two types of tests were conducted to precisely determine the impact of these leaks on the leg's operating parameters: bench tests and tests in the actual conditions. The research included an analysis of operation of the leg for two currently used valve blocks and a new błock design to minimize the effects of in ternal leakage. The results confirmed that the developed valve błock design is suitable for underground systems. It managed to limit the negative effects of internal leakage in the leg both during bench tests and in underground conditions. The results can find broad application in legs used in sections intended for use in difficult mining and geological conditions.

9

Migration Factor of Stimuling the Development of the Production Industry in Ukraine and Poland

70%

Mosora L. , Tolubyak V. , Brodny J. , Romanyshyn L. , Mosora Y.

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tom Vol. 3, Iss. 1

732--744

EN

The article examines the influence of migration processes on the formation and development of production capacities of countries. It is emphasized that population migration significantly affects the social and economic indicators of the country; under such influence, they can have both positive and negative trends. The article presents the main positive and negative consequences of population migration for donor countries, recipient countries, and for migrants themselves. It is proved that one of the most popular and promising is educational migration, which, under certain favorable circumstances, makes it possible to form highly qualified personnel, deepen international cooperation between higher education institutions of different countries, and strengthen the joint use of educational and scientific potential. The attention is focused on the fact that Ukraine today acts as a donor country and a leader in the number of young people who travel to study in Poland. It is indicated that in order to effectively regulate migration processes by the state, it is appropriate to ensure interaction between higher education institutions of different countries, namely, in the sphere of: a double-degree program, foreign internships, and holding joint international conferences. Using the example of Ivano-Frankivsk National Technical University of Oil and Gas and Ternopil National Economic University, it is shown how such interaction is implemented in practice and its consequences. The conclusions are based on the fact that educational migration is one of the most favorable types of migration. With its proper control by the state, it is possible to stimulate the development of the production industry in countries and improve social and economic indicators.