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Analysis of Steam Blocking in a Low Pressure Heating System

[+] Author Affiliations
Jinbo Chen, Haiguang Gong, Lili Tong

Shanghai Jiao Tong University, Shanghai, China

Paper No. ICONE21-15118, pp. V006T15A001; 7 pages
doi:10.1115/ICONE21-15118
From:
  • 2013 21st International Conference on Nuclear Engineering
  • Volume 6: Beyond Design Basis Events; Student Paper Competition
  • Chengdu, China, July 29–August 2, 2013
  • Conference Sponsors: Nuclear Engineering Division
  • ISBN: 978-0-7918-5583-6
  • Copyright © 2013 by ASME

abstract

An analytic investigation of the steam blocking in low pressure heating channels was conducted. In this paper, the dynamic model of the vapor-liquid interface is established through the basic conservation equations, and the rupture time of the vapor-liquid interface is predicted based on the Rayleigh-Taylor instability. Subsequently, the steam blocking model considering the steam accumulation and the vapor-liquid interface rupture in geysering flow is established. On these bases, the relative volume and relative pressure of the accumulated steam, the relative acceleration and perturbation intensity of the vapor-liquid interface, the time-varying behavior of the ratio of resistance and buoyancy are obtained. It is found that the accumulated steam basically increases linearly with the time going; The oscillation of the pressure and velocity, which is very large at the beginning time of the steam accumulation, decreases gradually with the continuous steam accumulation; The Reynolds number of the liquid within the rising section is very small at the stagnation state since there is no forced circulation flow, and finally a blockage is engendered in the pipeline with the steam accumulated. The theoretical results are in good agreements with the results obtained by a small-scale experiment. The mechanism model is able to predict the steam blocking property during the geysering flow in heating channels well, and can also establish a theoretical basis for the later analysis of the steam blocking elimination.

Copyright © 2013 by ASME
Topics: Pressure , Steam , Heating

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