氢正仲转化耦合流动换热板翅式换热器研究

In order to reveal the mechanism of hydrogen ortho-para conversion reaction coupled with flow and heat transfer in the catalyst filled micro-channel, based on the comparative analysis of the existing kinetic models of hydrogen ortho-para conversion, the process of hydrogen ortho-para conversion coupled with flow and heat transfer in a catalyst filled plain fin channel at 42-70 K temperature is investigated. Results show that the average relative error of the Elovich calculation model is 1.8%, which is the most consistent with the experimental data. Due to the effect of catalyst particles, the Colburn heat transfer factor on the hot side is 8-10 times that on the cold side, while the thermal enhancement factor on the hot side is close to that on the cold side. Therefore, the integrated equipment of hydrogen ortho-para conversion coupled with flow and heat transfer can ensure flow and heat transfer performance and realize continuous ortho-para conversion process. The volume fraction of para-hydrogen at the outlet is related to the mass space velocity. When the mass space velocity is less than or equal to 0.658 kg/(m³•s), the volume fraction of para-hydrogen at the outlet can meet the requirements. The research results provide a theoretical guidance for system performance optimization of large-scale hydrogen liquefaction units.