1 / 10

Context

Context. R&D activities in H2 technologies in France is driven by industrial research targeting real applications (DIMITHRY, H2E, HYPE, ...) Safety management is the “red line” and especially aiming at shaping mitigation techniques (avoid atex, control fire and explosion effects)

joselyn
Télécharger la présentation

Context

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Context • R&D activities in H2 technologies in France is driven by industrial research targeting real applications (DIMITHRY, H2E, HYPE, ...) • Safety management is the “red line” and especially aiming at shaping mitigation techniques (avoid atex, control fire and explosion effects) • Explosion venting need to be considered : • Widely used in industry, • Large body of experiments, • Theory, standards, guidelines, ...

  2. But, … • Vent dimensioning remains difficult : • Some key phenomena remain obscure : • The role of flame instabilities • Combustion of external cloud • Interaction internal/external explosion • ... • Severe lack of experimental : • ... evidence • ... data about vented hydrogen explosion • Purpose of this work : • Providing additional results about vented hydrogen-air explosions in vessels of industrial sizes

  3. Experimental devices • 1 m3 chamber : • Length : 1.85 m • Diameter : 0.94 m • Vent area : 0.15 m2 • 10 m3 chamber : • Length : 5.73 m • Diameter : 1.6 m • Vent area : 2 m2

  4. Instrumentation • 1 m3 chamber : • Injection device : 1 bottle of 5 l (filled with H2) • Pressure : 5 piezoresistive gauges • Inside : 2 gauges – (0-10 bar ± 0.01 bar) • Outside : 3 gauges – (0-2 bar ± 0.002 bar) installed in lenses supports at 1, 3 and 5 m • Ignition : pyrotechnical match (60 J) opposite to vent • Propagation of the flame : 6 ionisation gauges

  5. Instrumentation • 10 m3 chamber : • Injection device : 4 bottles of 8 l (filled with H2) • Pressure : 2 piezoresistive gauges (0-10 bar ± 0.01 bar) • Ignition : pyrotechnical match (60 J) opposite to vent • Propagation of the flame : • 4 ionisation gauges • 4 optical sensors

  6. Main results – 1 m3 chamber Classical shape with a single dome • 20% H2 in air End of combustion in the vessel Test 1.0-05 (20%H2) Overpressure keeps on rising when the combustion is ended in the chamber External explosion : strong pressure burst and propagation at the speed of sound Acoustic effect : Fresh gases replaced by burnt gases – local effect Acoustic effect : External atmosphere accelerated by the emerging flow of fresh gases

  7. External explosion : Pressure rises sharply before the end of combustion in the tank Main results – 10 m3 chamber • 23% H2 in air End of combustion in the vessel First pressure bulge : Combustion in the chamber Test 10.5-16 (23%H2) Natural vibration of metallic envelope Pressure decrease First acoustic mode of the chamber

  8. Conclusion • Typical industrial question : How do the data compare to the standards ? • Absolute necessity to refine our knowledge of the phenomenology and to produce much more data NEXT STORY NFPA 68 Pasman et al 1 m3 Bauwens et al 64 m3 Kumar et al 6.85 m3 Present 10 m3 Present 1 m3

  9. Next Story...

More Related