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1
Content available remote Zagadnienia poprawy bezpieczeństwa eksploatacji turbin parowych 18K370
Bzymek Grzegorz, Ziółkowski Paweł, Kowalczyk Tomasz, Badur Janusz
Instal
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2022
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nr 2
6--10
PL
W pracy przedstawiono proces podnoszenia bezpieczeństwa eksploatacji turbin parowych typu 18K370 w Elektrowni Opole od momentu zaistnienia pierwszej awarii w 2010 roku [1], aż po zainstalowanie systemu monitoringu on-line [2]. Ukazano sposób pracy bloku oraz możliwości analizy obciążenia stopnia regulacyjnego jako krytycznego węzła w konstrukcji turbiny. Przedstawiono wybrane wyniki analizy wytrzymałościowych CSD (Computational Solid Dynamic) jak i charakter przepływu w różnych reżimach pracy - analizy CFD (Computational Fluid Dynamic). Omówiono również sposób zarządzania żywotnością poszczególnych elementów [2, 3]. Przedstawione działania należy uznać za satysfakcjonujące i podnoszące bezpieczeństwo eksploatacji turbin parowych 18K370.
EN
The article concerns the process of improving the safety and reliability of 18K370 steam turbines in the Opole Power Plant since the occurrence of the first failure in 2010 [1], up to the installation of a monitoring system on-line [2]. The way the block works and the ability to analyse the control stage as a critical node in the design of the turbine has been presented. The analysis took into account the nature of the flow in different operating regimes of the CFD approach (Computational Fluid Dynamic) and strength analysis in CSD (Computational Solid Dynamic). Also, the way of management of individual lifecycle of elements has been briefly described [2, 3]. The action could be considered as satisfactory and improve the safety of 18K370 operating steam turbines.
2
Content available Dynamic analysis of the control stage of a high speed steam turbine
Sławiński D., Zakrzewski W.
Transactions of the Institute of Fluid-Flow Machinery
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2012
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nr 124
41--49
EN
This paper analyzes the possibility of resonances within a control stage of a high speed turbine. An original method for steady state operation is used for the analysis of the stiffness matrix representing: initial displacement blade (nominal shape blade obtained by nominal working point of turbine) and residual stresses following local crossing yield plastic strain. In the analysis there has been found a possibility of occurance of the resonance frequency, and mistuning by showing the safe working ranges. The calculation used the 3D modal and harmonic analysis within computational solid dynamics (CSD) and the results were compared with the 0D data from literature. After local crossing of yields stresses, on the basis of the harmonic analysis, there has been shown operation of the blade in the resonance point. Before crossing the yield stresses the blade is working in mistuning and a safe point.
3
Content available remote Control stage flow. Part II. Turbine low load
Lampart P., Szymaniak M
Zeszyty Naukowe. Cieplne Maszyny Przepływowe - Turbomachinery / Politechnika Łódzka
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2008
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nr 133
207--212
EN
The second part of the paper is devoted to the operation of the control stage for the turbine low load conditions. This refers to the situation when only two (out of four) control valves are open. The circumferential non-uniformity of flow patterns and rotor blade forces are calculated, discussed and compared with those of the nominal turbine load.
4
Content available remote Control stage flow. Part I. Turbine nominal load
Lampart P., Szymaniak M, Kwidziński R
Zeszyty Naukowe. Cieplne Maszyny Przepływowe - Turbomachinery / Politechnika Łódzka
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2008
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nr 133
201--206
EN
The partial admission control stage of a 200 MW steam turbine is studied using CFD and a 3D full-geometry model. The first part of the paper is devoted to the operation of the turbine at nominal load conditions when three (out of four) control valves are fully open, the forth valve is partly open. The circumferential non-uniformity of flow patterns and rotor blade forces are calculated and discussed.
5
Content available remote Unsteady forces acting on rotor blades of a large power steam turbine control stage at different levels of partial admission
Lampart P., Szymaniak M., Kardaś A.
Transactions of the Institute of Fluid-Flow Machinery
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2003
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nr 114
5-17
EN
Partial admission flow in the control stage of a 200 MW steam turbine is investigated with the help of a RANS solver with the k-w SST turbulence model in the code Fluent. A 2D model of flow at the mid-span section of the full-annulus is assumed. The results exhibit interesting details of the process of expansion in the control stage. Unsteady forces acting on the rotor blades of the control stage are calculated, and are subject to Fourier analysis.
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