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Continuous ultrasonic waves to detect steam bubbles in water under high pressure

Abstract

Steam in the recirculation circuit of boilers may lead to unacceptable high thermal loads on the evaporator tubes. The ability to detect steam in the recirculation circuit during process transients is therefore important. A simple detector using continuous ultrasonic waves and able to detect bubbles in water contained in steel tubes is described in this paper. The variation of the transmitted wave caused by the bubbles was determined by demodulation. The results have met the objectives set for cold water with air bubbles. A clear indication of the presence of steam bubbles was found in fast-flowing hot water in a steel tube with a diameter of 60 mm. A change in the low-frequency region of the modulation was the only indication of the presence of steam bubbles in the large-diameter downcomer of the water-separator drum of a boiler in an electrical power plant. Possible causes of the differences in the results obtained are discussed on the basis of differences in bubble sizes and in focusing and reflection of the ultrasonic waves. (orig.). 11 refs.; 10 figs.
Publication Date:
Jan 01, 1985
Product Type:
Book
Reference Number:
AIX-17-040096; EDB-86-103509
Resource Relation:
Related Information: KEMA Scientific and Technical Reports. v. 3(5)
Subject:
42 ENGINEERING; BOILING DETECTION; ULTRASONIC WAVES; BUBBLES; ELECTRONIC CIRCUITS; FLUID FLOW; PERFORMANCE TESTING; PRESSURE DEPENDENCE; SIZE; SOUND WAVES; TESTING; 420400* - Engineering- Heat Transfer & Fluid Flow
OSTI ID:
5678766
Research Organizations:
Keuring van Elektrotechnische Materialen N.V., Arnhem (Netherlands). Reactor Development Group; Keuring van Elektrotechnische Materialen N.V., Arnhem, Netherlands. Reactor Development Group
Country of Origin:
Netherlands
Language:
English
Submitting Site:
INIS
Size:
Pages: 9
Announcement Date:
May 13, 2001

Citation Formats

Hulshof, H J.M., and Schurink, F. Continuous ultrasonic waves to detect steam bubbles in water under high pressure. Netherlands: N. p., 1985. Web.
Hulshof, H J.M., & Schurink, F. Continuous ultrasonic waves to detect steam bubbles in water under high pressure. Netherlands.
Hulshof, H J.M., and Schurink, F. 1985. "Continuous ultrasonic waves to detect steam bubbles in water under high pressure." Netherlands.
@misc{etde_5678766,
title = {Continuous ultrasonic waves to detect steam bubbles in water under high pressure}
author = {Hulshof, H J.M., and Schurink, F}
abstractNote = {Steam in the recirculation circuit of boilers may lead to unacceptable high thermal loads on the evaporator tubes. The ability to detect steam in the recirculation circuit during process transients is therefore important. A simple detector using continuous ultrasonic waves and able to detect bubbles in water contained in steel tubes is described in this paper. The variation of the transmitted wave caused by the bubbles was determined by demodulation. The results have met the objectives set for cold water with air bubbles. A clear indication of the presence of steam bubbles was found in fast-flowing hot water in a steel tube with a diameter of 60 mm. A change in the low-frequency region of the modulation was the only indication of the presence of steam bubbles in the large-diameter downcomer of the water-separator drum of a boiler in an electrical power plant. Possible causes of the differences in the results obtained are discussed on the basis of differences in bubble sizes and in focusing and reflection of the ultrasonic waves. (orig.). 11 refs.; 10 figs.}
place = {Netherlands}
year = {1985}
month = {Jan}
}