scholarly journals Solutions of diesel drives for use in underground workings of hard coal mine

2010 ◽  
Vol 142 (3) ◽  
pp. 28-40
Author(s):  
Marek BRZEŻAŃSKI ◽  
Edward PIECZORA ◽  
Krzysztof KACZMARCZYK

The examples of application of combustion engines for the mining machinery drive have been presented in the article. The corresponding regulations concerned diesel combustion engines use in mines have been also presented. Moreover, the new technical solutions in such type engines aiming at the use safety increase and the exhaust gas toxic components emission decrease have been proposed.

2021 ◽  
Vol 906 (1) ◽  
pp. 012053
Author(s):  
Piotr Mocek

Abstract In connection with the liquidation of the hard coal mine Y and the change its functionality, it is necessary to modernize the main fan station installed at the “Northern” shaft of mine Y. The article presents concepts of changing the efficiency of WPK 5.0 fans installed in the “Northern” shaft and the methods of air flow regulation for target model of a mine with a reduced network of mining excavations. It discusses four alternative variants of technical solutions. The most effective of them are illustrated with a preliminary economic analysis, the results of which enable the right investment decision to be made.


Author(s):  
В.В. Мурамович ◽  
В.Ю. Каминский ◽  
С.Н. Турусов

Рассматривается экологическая проблема очистки отработавших газов углеводородных энергетических установок от токсичных компонентов. Показан состав основных токсичных компонентов, приведены значения энергии связи их молекул. Представлены существующие методы улучшения экологических характеристик двигателей внутреннего сгорания: рециркуляция отработавших газов, снижение степени сжатия, уменьшение угла опережения впрыска, добавление присадок к топливу и др. Перечислены их достоинства и недостатки. Предлагается новый метод – использование электромагнитных полей для очистки отработавших газов от токсичных компонентов. Выполнен оценочный расчет его эффективности. Показано, что применение устройств модификации в топливной системе двигателей внутреннего сгорания, а также в системе выпуска отработавших газов позволяет существенно снизить выбросы в окружающую среду вредных веществ, и, при этом, не требует принципиальных изменений в конструкции двигателей. Рабочий ресурс предлагаемых устройств электромагнитной обработки обусловлен применяемыми для их изготовления материалами. The ecological problem of cleaning the exhaust gases of hydrocarbon power plants from toxic components is considered. The composition of the main toxic components is shown; the values of the binding energy of their molecules are given. The existing methods of improving the environmental characteristics of internal combustion engines are presented: exhaust gas recirculation, reduction of the compression ratio, reduction of the injection advance angle, addition of fuel additives, etc. Their advantages and disadvantages are listed. A new method is proposed – the use of electromagnetic fields for cleaning exhaust gases from toxic components. An estimated calculation of its effectiveness is performed. It is shown that the use of modification devices in the fuel system of internal combustion engines, as well as in the exhaust gas system, can significantly reduce emissions of harmful substances into the environment, and, at the same time, does not require fundamental changes in the design of engines. The materials used for their manufacture determine the working life of the proposed electromagnetic processing devices.


2008 ◽  
Vol 25 (6) ◽  
pp. 315-321 ◽  
Author(s):  
Martin Krüger ◽  
Sabrina Beckmann ◽  
Bert Engelen ◽  
Thomas Thielemann ◽  
Bernhard Cramer ◽  
...  

2015 ◽  
Vol 22 (1) ◽  
pp. 47-54 ◽  
Author(s):  
Zbigniew Korczewski

Abstract The article discusses the problem of diagnostic informativeness of exhaust gas temperature measurements in turbocharged marine internal combustion engines. Theoretical principles of the process of exhaust gas flow in turbocharger inlet channels are analysed in its dynamic and energetic aspects. Diagnostic parameters are defined which enable to formulate general evaluation of technical condition of the engine based on standard online measurements of the exhaust gas temperature. A proposal is made to extend the parametric methods of diagnosing workspaces in turbocharged marine engines by analysing time-histories of enthalpy changes of the exhaust gas flowing to the turbocompressor turbine. Such a time-history can be worked out based on dynamic measurements of the exhaust gas temperature, performed using a specially designed sheathed thermocouple. The first part of the article discusses possibilities to perform diagnostic inference about technical condition of a marine engine with pulse turbocharging system based on standard measurements of exhaust gas temperature in characteristic control cross-sections of its thermal and flow system. Selected metrological issues of online exhaust gas temperature measurements in those engines are discusses in detail, with special attention being focused on the observed disturbances and thermodynamic interpretation of the recorded measuring signal. Diagnostic informativeness of the exhaust gas temperature measurements performed in steady-state conditions of engine operation is analysed in the context of possible evaluations of technical condition of the engine workspaces, the injection system, and the fuel delivery process.


2021 ◽  
Vol 157 (A4) ◽  
Author(s):  
R Grega ◽  
J Homišin ◽  
M Puškár ◽  
J Kul’ka ◽  
J Petróci ◽  
...  

Development of diesel engines is focused on reduction of exhaust gas emissions, increase of efficiency of the fuel mixture combustion and decrease of fuel consumption. Such engines are referred to as low-emission engines. Low- engines trends bring higher engine power outputs, torques and also increase of vibrations and noisiness level. In order to reduce these vibrations of diesel engines, it is necessary to apply different dynamical elements, which are able to increase an adverse impact of exciting amplitudes. One of the results is application of a pneumatic dual-mass flywheel. The pneumatic dual-mass flywheel is a dynamical element that consists of two masses (the primary and the secondary mass), which are jointed together by means of a flexible interconnection. This kind of the flywheel solution enables to change resonance areas of the mechanical system which consequently leads to reduction of vibrations.


2018 ◽  
Vol 92 (6) ◽  
pp. 732-742 ◽  
Author(s):  
Arka Jyoti Das ◽  
Prabhat Kumar Mandal ◽  
Satya Prakash Sahu ◽  
Angad Kushwaha ◽  
Rana Bhattacharjee ◽  
...  

2021 ◽  
Vol 1 (2) ◽  
Author(s):  
Piotr MAŁKOWSKI ◽  
Zbigniew NIEDBALSKI ◽  
Łukasz BEDNAREK

Ensuring the stability of mining excavations is a crucial aspect of underground mining. For thispurpose, appropriate shapes, dimensions, and support of workings are designed for the given mining andgeological conditions. However, for the proper assessment of the adequacy of the used technical solutions,and the calibration of the models used in the support design, it is necessary to monitor the behavior of theexcavation. It should apply to the rock mass and the support. The paper presents the automatic systemdesigned for underground workings monitoring, and the example of its use in the heading. Electronicdevices that measure the rock mass movements in the roof, the load on the standing support, and on bolts,the stress in the rock mass, are connected to the datalogger and can collect data for a long of time withoutany maintenance, also in hard-to-reach places. This feature enables the system to be widely used, inparticular, in excavations in the vicinity of exploitation, goafs, or in the area of a liquidated exploitationfield.


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