变压器油沸溢池火温度特征及传热模型试验研究  

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

作　　者：张佳庆 尚峰举 何旭 杨寒冰 孔得朋 ZHANG Jiaqing;SHANG Fengju;HE Xu;YANG Hanbing;KONG Depeng(State Grid Anhui Electric Power Research Institute,Anhui Province Key Laboratory of Electric Fire and Safety Protection(State Grid Laboratory of Fire Protection for Transmission and Distribution Facilities),Hefei Anhui 230601,China;College of Mechanical and Electronic Engineering,China University of Petroleum(East China),Qingdao Shandong 266580,China)

机构地区：[1]国网安徽省电力有限公司电力科学研究院电力火灾与安全防护安徽省重点实验室(国家电网公司输变电设施火灾防护实验室),安徽合肥230601 [2]中国石油大学(华东)机电工程学院,山东青岛266580

出　　处：《中国安全科学学报》2021年第11期106-113,共8页China Safety Science Journal

基　　金：国网安徽省电力有限公司科技项目(521205190020)。

摘　　要：为预测垫水层变压器油池火沸溢发生时间,开展以K150X变压器油为燃料的小尺度垫水层沸溢油池火试验,测量不同初始油层厚度和油池直径下油池轴线不同高度处的温度数据,分析燃烧过程中油层内部的温度分布特征,进而构建垫水油层内部一维单层传热模型,并预测垫水层变压器油池火的沸溢发生时间。结果表明:变压器油沸溢池火燃烧过程的温度变化具有阶段性特征,且油水界面处出现过热现象是发生沸溢的决定性因素;油层竖直方向一维单层传热模型能够较好地拟合试验测量值;基于传热模型提出垫水层变压器油池火的沸溢发生时间预测模型。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.

关 键 词：变压器油 池火沸溢 温度分布特征 传热模型 无量纲温度 

分 类 号：X934[环境科学与工程—安全科学]