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Design, realization and test operation of the vibrodiagnostic system VDS-UT at TG2 ETE system, Z1448/10
Procházka, Pavel ; Vaněk, František
The results of the development and realization of the contactless vibrodiagnostic system VDS-UT for monitoring of blade vibrations of the third blade row in the steam turbine TG2 at the power plant Temelín are described. The report deals with the concept and mathematical model of a system based on the method of time differences. The results of the development of magneto-resistive pick-ups sensing the position of the rotor and blades are summarized. The principle methods of data evaluation are discussed, which became the basis for the elaboration of programs for data analysis and on-line display of instantaneous information about the vibration of turbine blades. The results of measurements obtained by starting-up the turbine TG2 after a downtime are involved and analysed.
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Heterogenní částice v parních turbínách: měření na elektrárně Prunéřov II a další vývoj měřicích metod
Hrubý, Jan ; Kolovratník, M. ; Ždímal, Vladimír ; Jiříček, I. ; Bartoš, O. ; Moravec, P.
The form in which various impurities and admixtures are transported in steam circuits of power plants is a missing piece of knowledge needed to fully understand the processes of liquid phase formation in the low-pressure stages of steam turbines and, consequently, to model these processes and suggest modifications of turbine operation and design. The existence of heterogeneous particles in the superheated steam has been proven by the present team using an original sampling device, enabling using standard aerosol instrumentation to characterize the heterogeneous particles in superheated steam. We report measurements at power plant Prunéřov II, where 5.6E9 particles per kilogram of dry steam was found. The Sauter diameter of the particles d32=30nm was determined. The mass balance indicates, that substantial part of the mass of impurities is contained in particles <3nm, the current detection limit. For this reason an expansion chamber is being developed with a goal of detecting particles down to 1nm.
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Aerosol in the steam turbine?
Kolovratník, Michal ; Hrubý, Jan ; Ždímal, Vladimír
The small amount of admixtures in steam circuits of power stations influences their life-expectancy and energetic efficiency. It is likely that non-volatile admixtures are in the environment of the dry (superheated) steam transported in the form lf dry particles or concentrated nanometric droplets, aerosols. For the detection of these particles a new sampling line is proposed, using the aerosol technology. It will be possible to connect the sampling line to sampling ports of a steam turbine.
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