论文标题
通过快速磁共振成像探测的气体固定床中的温度分布
Temperature distribution in a gas-solid fixed bed probed by rapid magnetic resonance imaging
论文作者
论文摘要
控制催化固定床反应器内的温度分布对于优化产量和过程稳定性至关重要。然而，空间和时间分辨率的原位温度测量仍然具有挑战性。在这项工作中，我们通过将实时磁共振成像（MRI）的能力与温度依赖性质子共振频率（PRF）移位相结合，在圆柱固定床反应器中进行温度测量。使用热空气将床从室温加热到60〜 $^{\ Circ} $ C时，获得了三维（3D）温度图。获得的结果表明，沿轴向和径向尺寸的温度梯度清晰，并同意光温度探测测量值，平均误差为$ \ pm $ 1.5〜 $^{\ circ} $ c。我们认为，此处介绍的MR温度计方法为对气体固定固定床的质量和热传递的基本研究提供了新的观点，并且将来可能会扩展到反应性气体固体系统的研究。
Controlling the temperature distribution inside catalytic fixed bed reactors is crucial for yield optimization and process stability. Yet, in situ temperature measurements with spatial and temporal resolution are still challenging. In this work, we perform temperature measurements in a cylindrical fixed bed reactor by combining the capabilities of real-time magnetic resonance imaging (MRI) with the temperature-dependent proton resonance frequency (PRF) shift of water. Three-dimensional (3D) temperature maps are acquired while heating the bed from room temperature to 60~$^{\circ}$C using hot air. The obtained results show a clear temperature gradient along the axial and radial dimensions and agree with optical temperature probe measurements with an average error of $\pm$ 1.5~$^{\circ}$C. We believe that the MR thermometry methodology presented here opens new perspectives for the fundamental study of mass and heat transfer in gas-solid fixed beds and in the future might be extended to the study of reactive gas-solid systems.
