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In Reply to: RE: Hydrogen powered vehicles begin to make sense posted by Craiger56 on February 10, 2017 at 07:50:45
nt
all the best,
mrh
Follow Ups:
Although your point is taken -- so I looked up the lower explosive limits for the two gases in air.
Methane 5.0%
Hydrogen 4.0%
(this is by weight, not by mole - the molecular weight of hydrogen, of course, is ~2 and that of methane is ~16)
all the best,
mrh
...both H2 and CH4 are lighter than air. Small leaks will rapidly dilute and dissipate. Catastrophic failure of a pressure vessel would be a different matter but everything would be released as a gas and again would rapidly dissipate upwards. A liquid fuel like gasoline or diesel spreads out on the roadway or whatever and tends to consume all that lies above it once ignited.
As I see it, if there ever becomes a compelling economic or environmental reason to use H2 as an energy transport medium, we'll figure out safe use. OTOH, I don't expect this to happen in my lifetime...commercial fusion has been about 20yrs off for the last 60 yrs or so.
...Natural gas (mostly CH4 in my locale) is every bit as boomy as H2 and yet it's the residential/commercial/industrial heating fuel of choice and CNG is even powering many trucks and buses. Booms are few and far between. We've learn how to use it safely. H2 will be similar if we ever figure out fusion based electrolysis.
The Hindenburg's real problem was the covering membrane and not the H2.
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