Development of Dew and Frost Point Measurement System for Residual Water in High Pressure Hydrogen

概要

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In hydrogen stations for fuel cell vehicles, a rapid filling process of high pressure hydrogen to a tank on the vehicle is requested, and there are some concerns that possible condensation of residual water at a low temperature section in the fuelling system leads to occlusion in pipes or instability of flow system. Systematic and reliable frost point data concerning operating conditions of actual hydrogen stations were strongly required for understanding optimal design and operational conditions of stations. In the present investigation, dew and frost point measurement system for residual water in high pressure hydrogen with pressure tight test cell utilizing cooled mirror technique with original visible image analysis had been designed and developed. The system was available for frost point temperature below -50 oC, and total pressure of system up to 10 MPa. The pressure tight test cell had extensible design available for higher pressure experiments up to 40 MPa. Frost point measurements with hydrogen-water standard gases under conditions of 5~10 MPa, 5~55 ppm were carried out systematically, and measured data by the test cell with image analysis were relatively in good agreement with data by the embedded cooled mirror sensor for verification.