Download: Explanation: ionization of water vapor in the turbines of thermal or nuclear power stations

This document is a complement to the theory ofionization of water vapor during doping with water system G or G +

Document entirely in English on the relationship between the size of water droplets contained in the vapor, the pH and the density of the electric charge of the vapor.

The study is made at the output of power steam turbines. The aim of the study is to study the electrical charge of steam in order to understand and limit the corrosion of steam turbines in thermal (210 MW) or nuclear (1000MW) power plants.

Study conclusions:

- the total charge is always negative.
- the electric charge depends on the size of the droplets: the small ones are negatively charged and the larger ones positively.
- the water vapor which expands is electrically charged but this phenomenon is not yet well understood.
- the steam load is much greater on the turbines of nuclear power plants, but this has not yet been clearly explained. It is assumed that this is the effect of pH.

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Electrostatic Charge of Fine and Coarse Droplets in LP Steam Turbines

Petr V. and M. Kolovratník Department of Fluid Dynamics and Power Engineering, Czech Technical University in Prague, Technicka 4, 166 07 Prague, Czech Republic E-mail: petr@fsid.cvut.cz, kolovrat@fsid.cvut.cz

Separate contributions of the fine and coarse droplets in the steam steam charge density is presented. The tests were performed by means of combined optical extinction and charge probe at the exit of the 0R blades of the nuclear 1000 MW and fossil 210 MW LP steam turbines. Negative load of the fine droplets was observed with positive load of the coarse droplets. LP steam turbine with larger pH value of the steam condensate. Correlation function between the load and the size of the droplets is presented that can be used in the analysis of the charging models.

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