首页|Multi-point temperature measurements in packed beds using phosphor thermometry and ray tracing simulations

Multi-point temperature measurements in packed beds using phosphor thermometry and ray tracing simulations

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Packed bed reactors are commonly found in the process industry,for example in flame-assisted calci-nation for cement production.Understanding the heat transfer inside the bed is essential for process control,product quality and energy efficiency.Here we propose a technique to determine the internal temperature distribution of packed beds based on a combination of lifetime-based phosphor ther-mometry,ray tracing simulations,and assimilation of temperature data using finite element heat transfer simulations.To establish and validate the technique,we considered a reproducible regular packing of 6 mm diameter aluminum spheres,with one of the spheres in the top layer being electrically heated.If a sphere inside the packing is coated with thermographic phosphors and excitation light is directed to-wards the packing,luminescence from the coated sphere exits the packed bed after multiple reflection and the sphere's temperature can be determined.Isothermal measurements showed that the temper-ature obtained by phosphor thermometry is independent of the luminescent sphere location.When imaging the luminescence on a camera,the luminescence distribution in recorded image depended,however,on the position of the sphere.Therefore,in setups with multiple phosphor-coated spheres,their signals can be separated using a least squares fit.We demonstrate the approach using a setup with three luminescent spheres and validated the temperature readings against thermocouple measurements.To obtain the spatial signatures for individual sphere positions required for the least squares fit,ray tracing simulations were used.These provide an efficient alternative to single sphere measurements that are only practical for regular spherical packed beds.Multi-point measurements were used as input to a finite element heat transfer simulations to determine parameters such as particle-to-particle air gap distance.With these,the full temperature distribution inside the bed could be assimilated from the measured values.

Packed bedsPhosphor thermometryRay tracingHeat transfer simulationData assimilation

Guangtao Xuan、Mirko Ebert、Simson Julian Rodrigues、Nicole Vorhauer-Huget、Christian Lessig、Beno?t Fond

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Institute of Fluid Dynamics and Thermodynamics,OVGU Magdeburg,Universitaetsplatz 2,Magdeburg,39106,Saxony-Anhalt,Germany

Institute of Simulations and Graphics,OVGU Magdeburg,Universitaetsplatz 2,Magdeburg,39106,Saxony-Anhalt,Germany

Institute of Process Engineering,OVGU Magdeburg,Universitaetsplatz 2,Magdeburg,39106,Saxony-Anhalt,Germany

ONERA,The French Aerospace Lab,Department of Aerodynamics,Aeroelasticity and Aeroacoustics(DAAA),Paris-Saclay University,8,rue des Vertugadins,Meudon,92190,France

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funding by the Deutsche Forschungsgemeinschaft(DFG,German Research Foundation)

422037413-TRR 287

2024

10.1016/j.partic.2023.03.015

颗粒学报(英文版)
中国颗粒学会　中国科学院过程工程研究所

颗粒学报(英文版)

CSTPCD
影响因子：0.632
ISSN：1674-2001
年,卷(期)：2024.85(2)
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