Influence of Water-Chemical Regime on Electrization of Steam Flow, Reliability and Efficiency of a Turbo Unit View Full Text


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Article Info

DATE

2021-11-03

AUTHORS

A. A. Tarelin, A. V. Nechaev

ABSTRACT

The influence of the pH of the working medium on the processes of electrification of the wet steam flow and the indicators of the reliability and efficiency of the turbine plant are considered. The assessment of the formation of charges in the flow, depending on the water-chemical regime (WCR), was carried out on a laboratory bench created for this purpose and directly on the turbine. The laboratory bench was equipped with an air-droplet flow supply system, which, passing through a special device, electrified, and the current was recorded at the exit depending on the pH of the medium. Full-scale tests were carried out on an 800 MW turbine unit at the Navajo TPP (Arizona, United States). On the basis of these studies, it was found that the intensity of the formation of charges and their polarity depend on pH during the electrification of wet steam in a turbine. In an alkaline medium, the sign of the charges at certain boundary pH changes from negative to positive. The study of the influence of the pH of the feed water on the efficiency of the steam expansion process in the flow path of the turbine was carried out on a thermodynamic bench using a supersonic nozzle and in natural conditions on a turbine with a capacity of 800 MW. It was found that significant changes in both the thermodynamic process in the supersonic nozzle at the test bench and the turbine power do not occur at pH 7.0–9.6. A well-reasoned explanation and justification of these experimental results is presented. The influence of an aggressive charged working medium on the surface strength of rotor blades is considered, and studies in this direction were based on the fact that the degradation of the blade surfaces, especially the last stage of the turbine, largely depends on the intensity of the formation of charges and their polarity. The indicators of the working environment that most significantly (by 1.5–2.0 times) intensify electrocorrosive processes are determined. It is proposed, due to the rational choice of pH in the preparation of feed water, to control the process of formation of flow charges and control it, which will make it possible to increase the wear resistance of the surfaces of the blades and extend their service life. More... »

PAGES

873-880

Identifiers

URI

http://scigraph.springernature.com/pub.10.1134/s0040601521110057

DOI

http://dx.doi.org/10.1134/s0040601521110057

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1142386173


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