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两段气升式气固环流取热器导流筒壁与床层间的传热特性研究 被引量:17

Study on Heat Transfer Between Gas-Solids Suspension and the Surfaces of Two Draft Tubes in an Airlift Loop Heat Exchanger
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摘要 在一套φ600 mm×7000 mm半圆形的大型有机玻璃两段环流实验装置上,采用FCC催化剂,在导流筒区表观气速0.101~0.670 m/s,环形区表观气速分别为0.049 m/s和0.099 m/s范围内,测定了导流筒壁与颗粒床层之间的传热系数、床层密度和颗粒环流速度的分布规律.结果表明床层密度和颗粒环流速度是影响传热的主要因素,而这两者的变化规律完全由导流筒区和环形区的气速来调控.传热系数随导流筒区气速的增加而增加,适当增加环形区气速能显著改善传热效果.实验结果表明,两段环流取热器比目前工业催化裂化装置使用的外取热器有较高的传热系数.通过理论分析,给出了两段环流取热器的传热系数关联式.
出处 《过程工程学报》 CAS CSCD 北大核心 2004年第z1期611-618,共8页 The Chinese Journal of Process Engineering
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参考文献13

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