火灾环境下特高压钢管塔的最小安全距离研究  

Research on Minimum Safety Distance of UHV Steel Tube Tower in Fire Environments

作　　者：李聪聪 凌晨冰 孟祥俊伟 肖庆彪 冯立言 江文强[1] LI Congcong;LING Chenbing;MENG Xiangjunwei;XIAO Qingbiao;FENG Liyan;JIANG Wenqiang(Department of Mechanical Engineering,North China Electric Power University,Baoding 071003,China)

机构地区：[1]华北电力大学机械工程系,河北保定071003

出　　处：《电力科学与工程》2023年第2期72-78,共7页Electric Power Science and Engineering

基　　金：国家电网有限公司总部科技项目(SGHEBD00FCJS2000217)。

摘　　要：为了得到森林火灾时特高压钢管塔与火场的最小安全距离,进行了森林火场火灾动力学模拟计算;研究了不同火灾场景下特高压钢管塔主材的最高温度的变化规律、火场对主材的传热规律,得到了不同高度处主材的屈服强度折减系数,给出了主材构件失效准则;研究了常遇风速下特高压钢管塔的失效规律。研究结果表明:在特高压钢管塔与火场的距离小于14m时,其主材局部可能会发生失效;在垂直高度50 m处,主材所受热辐射强度最强,主材温度也最高;在主材与火场距离由14m过渡到13m的过程中,其屈服强度下降幅度由12%变为36%;主材与火场距离大于15m时,虽然材料屈服强度受到高温影响会有所折减,但仍满足标准要求。故最小安全距离建议取15 m。In order to obtain the minimum safety distance between UHV steel pipe tower and the fire site during forest fire,the fire dynamics simulation calculation of forest fire was carried out.The variation law of the maximum temperature of the main material of UHV steel pipe tower and the heat transfer law of the fire scene to the main material under different fire scenarios were studied,and the yield strength reduction coefficient of the main material at different heights was obtained,and the failure criterion of the main material components was given.The failure law of UHV steel pipe towers under common wind speed was studied.The results show that when the distance between the UHV steel pipe tower and the fire site is less than 14 m,the main material may fail locally.At a vertical height of 50 m,the heat radiation intensity of the main material is the strongest,and the temperature of the main material is also the highest.In the process of the transition from 14 m to 13 m between the main material and the fire scene,the yield strength changed from 12%to 36%.When the distance between the main material and the fire field is greater than 15 m,although the yield strength of the material will be reduced by the influence of high temperature,it still meets the standard requirements.Therefore,the minimum safety distance is recommended to be 15 m.

关 键 词：特高压钢管塔 火灾动力模拟 屈服强度 最小安全距离 

分 类 号：TM753[电气工程—电力系统及自动化]