THERMAL SCIENCE

International Scientific Journal

Li-Hua Cao

,

He-Yong Si

,

En-Fu Dong

,

Zhan-Zhou Wang

,

Huan-Huan Luo

,

Gui-Ping Zhou

,

Nan Wu

EVAPORATION CHARACTERISTICS AND EFFICIENT WORKING AREA OF MULTI-STAGE HIGH PRESSURE AND TEMPERATURE REDUCING VALVE

ABSTRACT
A well understanding on the evaporation characteristics and efficient working area of multi-stage high pressure and temperature reducing valve (MSHPTRV) is important for improving the performance and safety of MSHPTRV. The water spraying and evaporation model are integrated into the flow model of MSHPTRV. Compared with the experimental data, the model can show the thermal process well. The flow characteristics and interaction between steam and droplets are presented. On this basis, the increase rate of entropy, Sdis, is adopted to analyze the thermodynamic loss and innovatively determine the efficient working area of MSHPTRV. The results show that the pressure reducing effect of the second orifice plate is prominent, which accounts for 41.6% of the total pressure drop. The "steam-water layer" is formed at the boundary of steam and water. At the inlet of second orifice plate, the maximum Sdis is 0.782, and the downstream of second orifice plate is the efficient working area of MSHPTRV. The length of evaporation section increases with the droplets diameter significantly.
KEYWORDS
multi-stage high pressure and temperature reducing valve, evaporation model, water spraying, flow characteristics, increase rate of entropy
PAPER SUBMITTED: 2020-07-19
PAPER REVISED: 2021-03-02
PAPER ACCEPTED: 2021-03-09
PUBLISHED ONLINE: 2021-05-16
DOI REFERENCE: https://doi.org/10.2298/TSCI200719162C
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2022, VOLUME 26, ISSUE Issue 2, PAGES [1623 - 1636]
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Evaporation characteristics and efficient working area of multi-stage high pressure and temperature reducing valve

© 2024 Society of Thermal Engineers of Serbia. Published by the Vinča Institute of Nuclear Sciences, National Institute of the Republic of Serbia, Belgrade, Serbia. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International licence