Papers by Sławomir Grądziel
Zeszyty Naukowe. Elektryka / Politechnika Opolska, 2000
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Energies, Jan 15, 2019
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E3S web of conferences, 2021
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Archiwum Energetyki, 2008
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Thermal Science, 2019
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Archivum Combustionis, 2015
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Energy, Apr 1, 2019
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Heat Transfer Engineering, Aug 29, 2022
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Springer eBooks, 2014
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IEEE PowerTech Conference, 2002
In order to rise the efficiency of electric energy production in steam power stations, the parame... more In order to rise the efficiency of electric energy production in steam power stations, the parameters of fresh steam are higher, achieving in supercritical power blocks pressure of the order of 30 MPa and temperatures around 600 °C. On the other hand it increases the wall thickness of the pressure component, despite introducing new steel grades. Because the thick-walled boiler components are subjected to the irregular and fast temperature changes, it is necessary to monitor the operation of the thick-walled pressure components, especially during boiler start-up and shut-down. A new system for monitoring the temperature changes, thermal stresses and rate of heating allows to determine a lot of parameters. All the measured and calculated data are available in the on-line mode and are displayed on the monitor.
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Procedia Engineering, 2016
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E3S Web of Conferences, 2021
The paper provide a comprehensive review on water turbine integrated with electrical generator. T... more The paper provide a comprehensive review on water turbine integrated with electrical generator. The integration consists in combining the generator with the turbine in one device without the use of a gearbox. The practical implementations of these solutions date back to the 1980s and are more and more common. Such a solution gives a wide possibility of integration and reduction of costs of the hydro unit, however, due to certain technological problems, it is not widely available. This article classifies the different types of integration and analyses it from a technical and economic point of view. Practical implementations and operational problems were also shown.
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Thermal Science, 2019
The article presents the method of determining the temperature distribution in waterwall tubes of... more The article presents the method of determining the temperature distribution in waterwall tubes of the combustion chamber. To simulate the operating conditions of waterwall tubes have been selected the model with distributed parameters, which is based on the solution of equations of the energy, mass and momentum conservation laws. The purpose of the calculations is determining the enthalpy, mass-flow and pressure of the working fluid flowing inside the tubes. The balance equations have been transformed into a form in which spatial derivatives are on the left, and the right side contains time derivatives. Then the time derivatives were replaced with backward difference quotients, and the obtained system of differential equations was solved by the Runge-Kutta method. The analysis takes into account the variability of fluid parameters depending on the mass-flow at the inlet of the tube and heat flux on the surface of the tube. The analysis of fluid parameters was carried out based on op...
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Forsch Ingenieurw, 1997
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Papers by Sławomir Grądziel