The wetness fraction of steam causes dangerous erosion of turbine blades and other components, and decreases efficiency of stages. The instrumentation of wet steam has, therefore, attracted growing interest from the point of safety and economical operation of power stations. Based on the light scattering technique, a method is presented that is capable of measuring the wetness fraction of steam, the mean water droplet diameter as well as their full size distribution. An optical probe has been constructed that can be used in the turbines in operation. Its main characteristic and features are discussed in this paper. Experimental results in a 200 MW condensing steam turbine are also given.
Issue Section:
Power
1.
Accornero, A., and Maretto, L., 1987, “Field Measurements in LP Cylinder of a 320 MW Turbine,” “Aerothermodynamic of Low Pressure Steam Turbines and Condensers,” M. J. Moore et al., eds., Hemisphere, Bristol, PA, pp. 185–195.
2.
Barbacci, P., 1991, “Steam Quality Measurements by an Optical Probe Using a Light Scattering Method,” Proceedings of the International Conference on Multiphase Flow, Tsukuba, Giappone, Settembre, pp 132–138.
3.
Cai, X. S., 1991, “Total Light Scattering Techniques and its Application in Wet Steam Measurement,” Ph.D. thesis, University of Shanghai for Science and Technology, Shanghai, China.
4.
Cai, X. S., Wang, N. N., and Wei, J. M., 1994, “The Development of Optical Measurement Technique for Wet Steam in Turbines,” Proceedings of the 3rd Int. Symposium on Multiphase Flow and Heat Transfer, Xian, China, pp. 432–430.
5.
Kasprzyk
S.
1964
, “Ein Selbstansaugendes Kalorimeter zur Bestimmung der Dampffeucht
,” Brennstuff-Wa¨rme-Kraftwerk (BWK)
, Vol. 16
, pp. 350
–355
.6.
Kleitz, A., 1991, “Three Probes for Water Droplet Sizing in Wet Steam Turbines,” Proceedings of the European Conference on Turbomachinery, London, pp. 176–183.
7.
Moore, M. J., and Sieverding, C. H., 1987, “Aerothermodynamic of Low Pressure Steam Turbines and Condensers,” Hemisphere, Bristol, PA.
8.
Renner, M., Stetter, H., and Cai, X. S., 1994, “Flow and Wetness Measurements at a Transonic Wind Tunnel with a Slotted Nozzle,” Proceedings of the 12th Symposium on Measuring Technique for Transonic and Supersonic Flow in Cascades and Turbomachines, Prague, Czech, pp. 171–177.
9.
Roegener
H.
1960
, “Bestimmung der Abdampfnaesse bei Kondensationsturbinen
,” BWK
, Vol. 12
, pp. 220
–225
.10.
Walter, P. T., et al., 1985, “Wetness and Efficiency Measurement in LP Turbine with an Optical Probe as a Aid to Improving Performance,” Joint ASME/AEEE power Generation Conference, Paper No. 85-JPGC-GT-9.
11.
Wang, N. N., 1982, “Naessemessung in Niederdruckturbine mit Lichtsonde,” Ph.D. thesis, University of Stuttgart, Germany.
12.
Wang
N. N.
Zheng
G.
1994
, “A Theoretical and Experimental Study of the Total Light Scattering Technique for Particle Size Analysis
,” Particle and Particle System Characterization
, Vol.11
, pp. 309
–314
.13.
Williams, G. H., and Lord, M. J., 1978, “Measurement of Coarse Water Distribution in the LP Cylinder of Operating Steam Turbine,” Proc. Inst of Mechanical Engineers, Vol. 190, No. 4.
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