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Dimensionnement et étude expérimentale d’un vaporiseur à milli-canaux

Abstract : The ever-growing awareness of the impact of human activities on the environment makes industries find environmentally friendly alternatives. In the automotive sector, the development of less polluting cars using hydrogen as fuel is an example. To successfully promote this type of vehicles to people, the providing network of hydrogen has to be set up. To tackle the challenge of this deployment, Air Liquide, through the FAIR project (Additive manufacturing for the intensification of reactors), aims to intensify the Steam Methane Reforming process in order to develop small mobile hydrogen production unit. Inside this process, a particular step, the water vaporisation, has to be intensified. To study this intensification, an experimental test bench and a vaporisation module are sized, assembled and instrumented in the Reactions and Chemical Engineering Laboratory (LRGP) in Nancy. The test bench uses a hot oil convection to vaporise the water. The vaporisation module, designed as a milli-structured plate heat-exchanger, has a window enabling the visualisation and the recording of the boiling water hydrodynamics with a high-speed camera. Four milli-structured plates are tested: two of them have 10 semi-circular straight channels either mechanically engraved of made by additive manufacturing, the third plate has various shapes of engraved channels and finally the fourth plate has 7 engraved straight channels with triangular cavities. An innovative method for the post-treatment of high-speed videos is developed in order to produce Spatio-Temporal Diagrams (DST) showing the spatial evolution of liquid-vapor interfaces by the time inside a channel. The exploitation of this new tool enables the determination and the description of boiling phenomena (spontaneous bubble nucleation, liquid oscillations), the understanding of the boiling events chronology and the characterisation of flow regimes (bubbly, slug, churn, annular flow and dry out of the channel). Moreover, a quantitative exploitation of the DST is possible such as the local vapor quality needed for the drawing of flow regime map. Thanks to the measurement of various operating data on the test bench, the characterisation of the heat losses is done in order to assess the vapor quality of the water flow outgoing the vaporiser by a heat balance. The two-phase heat-transfer coefficients are also assessed. Finally, a methodology of milli-structured vaporiser made by additive manufacturing pre-sizing is put forward. It is based on two case-study on the intensification of water vaporisation in a small mobile hydrogen production unit and in a standard SMR process.
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Submitted on : Thursday, October 20, 2022 - 12:13:56 PM
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Guillaume Henry. Dimensionnement et étude expérimentale d’un vaporiseur à milli-canaux. Génie des procédés. Université de Lorraine, 2020. Français. ⟨NNT : 2020LORR0130⟩. ⟨tel-03117831⟩



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