旋转热管搅拌桨反应釜传热性能的实验研究

Experimental Investigation on the Heat Transfer Characteristics of Rotating Heat Pipe Paddle in a Reactor

提出了一种旋转热管形式的反应釜装置,旋转热管搅拌桨起到了搅拌和传热的作用,能够取代传统反应釜中的换热元件和搅拌装置。通过对旋转热管反应釜的传热性能测试,考察了反应釜内温度、旋转速度、冷却水流速以及热管充液量对热管传输功率、总热阻、总传热系数的影响。结果表明,采用旋转热管能够有效的移除反应热,反应温度为85℃,转速为200 r/min的条件下传热功率能达到1 k W。转速对旋转热管的传热性能有较大影响,反应温度为75℃时,静止热管的热阻为0.082℃/W,转速为150 r/min时热阻则降为0.048℃/W,传热能力显著提升。此外充液量较小时热管热阻对转速的变化更敏感,随反应温度的提升会大幅降低。

In this study,a heat pipe agitated reactor is proposed,where the heat pipe plays roles in stirring and transferring heat. This heat pipe can be used to replace the heat exchanger components and stirring devices in a conventional reactor. By experimentally investigating the heat transfer performance of this rotating heat pipe in a reactor,the effects of reaction temperature,rotation speed,cooling water flow rate and the filling ratio in power of heat transfer,totalthermal resistance,and the overall heat transfer coefficient were analyzed. The results show that rotating heat pipe can effectively remove the heat of reaction,and its heat transfer power reaches 1 k W at the temperature of 85 ℃ and rotating speed of 200 r / min. Rotating speed has a great impact on the heat transfer performance of the rotating heat pipe. The thermal resistance of this heat pipe at still condition and temperature of 75 ℃ is 0. 082 ℃ / W,but it decreases to 0. 048 ℃ / W at the speed of 150 r / min,implying a considerable improvement in the heat transfer performance. Furthermore,the thermal resistance of the heat pipe is more sensitive to the changes in rotating speed when the filling amount is low,and will decrease with the increase in reaction temperature.