摘要
为了揭示焦油在换热器中的冷凝传热过程,基于Euler Wall Film(EWF)模型对热解气在冷凝管内的冷凝过程进行了模拟。此外,基于实验数据对上述冷凝模型进行验证。研究结果表明:采用EWF模型模拟计算的结果与实验数据吻合良好;当热解气入口速度从2 m/s增加至3.5 m/s时,沿冷凝壁面液膜速度增大,液膜厚度减小了25%,平均热流密度增大了23%;当热解气入口温度从530 K增加至620 K时,沿冷凝壁面液膜厚度增大了26%,平均热流密度增大了21%;当冷却水的温度从295 K增加至325 K时,沿冷凝壁面液膜厚度减小了32%,平均热流密度减小了30%。研究结果对焦油换热器结构设计与操作指导具有一定的参考价值。
In order to reveal the condensation heat transfer process of tar in heat exchanger,the condensation process of pyrolysis gas in condensation tube was simulated based on Euler Wall Film(EWF)model.Besides,the above condensation model was verified based on the experimental data.The results show that the EWF model simulation results are in good agreement with the experimental data.When the inlet velocity of pyrolysis gas increases from 2 m/s to 3.5 m/s,the liquid film velocity along the condensation wall increases,the liquid film thickness decreaseds by 25%,and the average heat flux density increases by 23%.When the pyrolysis gas temperature increases from 530 K to 620 K,the liquid film thickness along the condensation wall increases by 26%,and the average heat flux density increases by 21%.When the temperature of the cooling water increases from 295 K to 325 K,the thickness of the liquid film along the condensation wall decreases by 32%,and the average heat flux decreases by 30%.The research results have a certain reference value for the structural design and operation guidance of tar heat exchangers.
作者
刘东帅
贺翔宇
许建良
代正华
王辅臣
LIU Dong-shuai;HE Xiang-yu;XU Jian-liang;DAI Zheng-hua;WANG Fu-chen(East China University of Science and Technology,Shanghai Engineering Research Center of Coal Gasification,Shanghai 200237,China)
出处
《化学工程》
CAS
CSCD
北大核心
2021年第6期14-19,共6页
Chemical Engineering(China)
基金
国家重点研发计划资助项目(2018YFB0605000)。
