焊管2025，Vol.48Issue(9)：21-26,6.DOI:10.19291/j.cnki.1001-3938.2025.09.004
基于氧化镁热导率的电加热器传热规律研究
Study on Heat Transfer Characteristics of Electric Heaters Based on MgO Thermal Conductivity
摘要
Abstract
To investigate how thermal conductivity of MgO impacts heat transfer characteristics of electric heaters,a thermo-fluid-solid coupled numerical model based on thermodynamic and heat transfer was built.Mechanism of different MgO thermal conductivity and axial uniformity on temperature field of heater and fluid heating effect were analyzed.Results show that thermal conductivity of magnesium oxide exhibits negative correlation with core wire and temperature of magnesium oxide.However,when the thermal conductivity exceeds 3.6 W/(m·K),further increases result in a progressively smaller reduction in the temperature drop across the electric heater.Axial uniformity of MgO has a pronounced effect on the temperature distribution of the core wire and MgO.The average temperatures of the core wires and MgO across the three axial thermal conductivity distribution configurations rank in descending order as follows:convex,increasing,and concave types.Furthermore,variations in MgO thermal conductivity and axial uniformity have a relatively minor impact on the temperatures of the sheath and the surrounding fluid.This study clarifies the optimal range for MgO thermal conductivity,providing a crucial theoretical foundation for optimizing downhole electric heater and developing high-power-density heater.关键词
MgO稠油热采/电加热器/热导率/流体温度场Key words
MgO heavy oil thermal recovery/electric heater/thermal conductivity/fluid temperature field分类
能源科技引用本文复制引用
王和平,宋红兵,周超,杨瑶,汪海涛,董亮亮,冯海洋..基于氧化镁热导率的电加热器传热规律研究[J].焊管,2025,48(9):21-26,6.基金项目
中国石油集团公司关键核心技术攻关项目"井下大功率电加热器研制"(项目编号2024ZG23). （项目编号2024ZG23）
