Study on temperature characteristics and heat transfer model of boilover in transformer oil pool fires

doi:10.16265/j.cnki.issn 1003-3033.2021.11.015

Abstract

Abstract: In order to predict boilover's onset time of transformer oil pool fires with water sublayer, a series of small-scale experiments were carried out with K150X transformer oil as fuel. Temperature data at different heights of oil pool axis under different initial oil layer thicknesses and oil pool diameters were measured, and temperature distribution characteristics inside transformer oil layers during burning process were analyzed. Finally, a one-dimensional single-layer heat transfer model of oil-water layer was established, and boilover's onset time was predicted. The results show that the temperature variation during burning process has phased characteristics, and overheating phenomenon at oil-water interface is the decisive factor for occurrence of boilover. Moreover, the proposed one-dimensional single-layer heat transfer model can fit measured values of this experiment well, and the prediction model for boilover's onset time is put forward based on the heat transfer model.

Key words: transformer oil, oil pool fire boilover, temperature distribution characteristics, heat transfer model, dimensionless temperature

CLC Number:

X934

ZHANG Jiaqing, SHANG Fengju, HE Xu, YANG Hanbing, KONG Depeng. Study on temperature characteristics and heat transfer model of boilover in transformer oil pool fires[J]. China Safety Science Journal, 2021, 31(11): 106-113.

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