A Honda FCX Concept and hydrogen refueling station. There is concern about the safety of handling hydrogen. (Photo courtesy of Honda)
Within the next few years, you might see a new type of car in dealer
showrooms… one that runs on hydrogen. Many engineers and car company
officials predict that hydrogen vehicles will replace gasoline power in
the next 10 to 15 years. But lots of people think hydrogen is too
explosive and wonder if a hydrogen-based economy will be safe.
Julie Grant reports:
Transcript
Within the next few years, you might see a new type of car in dealer
showrooms… one that runs on hydrogen. Many engineers and car company
officials predict that hydrogen vehicles will replace gasoline power in
the next 10 to 15 years. But lots of people think hydrogen is too
explosive and wonder if a hydrogen-based economy will be safe.
Julie Grant reports:
Sales associate Chris Beckham hears a lot of concerns about the new
Honda fuel-cell car on display at a recent car show:
“I know a lot of people are kind of worried about the safety of the
hydrogen vehicle because it’s basically like running on an atom bomb.”
Honda fuel cell marketing specialist Steve Ellis rolls his eyes when he
hears comments like that. The Cold War-era hydrogen bomb comes to mind
for people because it’s one of the few times they’ve heard the word
“hydrogen” used in conversation. Another time is when people talk
about the hydrogen-filled blimp, the Hindenburg. Ellis wants to
clear the air about the Hindenburg disaster.
The huge zeppelin burst into flames, and a lot of people blame the hydrogen:
“But history has now shown that it was the coating, the covering of the
material that actually was sustaining the fire. The hydrogen itself of
course being flammable, whatever that cause was, it did ignite. But
the flame was sustained by the coating. That’s what people see.”
Ellis says hydrogen has gotten a bad rap:
“When in reality, science has proven that it wasn’t the guilty party.”
(Grant:) “But it is a very flammable substance?”
(Ellis:) “Sure. As is gasoline.”
There’s still controversy over whether the hydrogen or the coating
caused the Hindenburg to burn. Regardless. Many energy experts say
hydrogen is more flammable then gasoline, but Ellis says the dangers of
a hydrogen fire aren’t any worse then a gasoline fire, they’re just
different.
He says people are used to dealing with liquid gas at the fueling
station. But in some ways, hydrogen could be considered less dangerous
then gas. When gas spills it pools up on the ground, and if someone
drops a cigarette – yipes! – it could be a long day for firefighters.
But hydrogen goes into cars in gaseous form. If there’s a hydrogen
leak, Ellis says it’d be easy to put out a fire:
“So with, you know, fire systems at the station, if there’s any
detection of a flame or any incident like that, as soon as the source
is shut off, the fire’s out, it’s gone. First responders and many fire
departments have said they feel like responding to a hydrogen fire…
it’s like, by the time they’ll get there, they’ll be nothing to put out.
It’ll likely have taken care of itself.”
That’s one advantage of using a light-weight fuel like hydrogen: it
dissipates quickly into the air because it’s lighter then air. But
because it’s so light, each cubic foot doesn’t pack that much energy.
That’s why cars can’t store that much hydrogen in the tank.
Hydrogen-expert Paul Erickson says that low energy content also creates
other safety problems. Erickson is director of the Hydrogen Production
and Utilization Lab at University of California-Davis. In order to
make cars that hold enough hydrogen to travel a respectable distance
between re-fuelings, he says they have to use a lot of pressure to
squeeze enough hydrogen into a tank:
“It’s just very difficult to get the range out that you’d like. And so you
end up having to pressurize the hydrogen to 3,000, now we’re up to
5,000, now up to 10,000 pounds per square inch. I wouldn’t want to sit
on a 10,000 psi tank of anything, much less hydrogen.”
Erickson says car companies understand the dangers of combining
hydrogen’s high flammability with high pressure in the tanks. They
don’t want any hydrogen to escape from the tank if there’s a collision
and they don’t want the tank to blow up. So, the tank is probably the
strongest component on the hydrogen vehicles being built today.
That’s not the case with regular gas cars. Steve Ellis at Honda says
they won’t release too many consumer vehicles to start. One reason is
to slowly get people used to handling hydrogen safely.
For the Environment Report, I’m Julie Grant.