Posted on 03/08/2012 10:11:12 AM PST by shove_it
The appeal of hydrogen is the lack of understanding what it takes make hydrogen fuel.
You have to use way more energy contained in another source to make the hydrogen, then significantly more energy to compress it down to a usable volume. Because of the low specific gravity, it creates more waste heat (additional lost energy) than compression of something like natural gas. What Ive heard about hydrogen is that its quite a different proposition to push it through pipelines
We have hydrogen pipelines in places like Houston. It is used in hydrocracker and other some other refining units. The compression related to moving it in a pipeline.
I believe it had to do with corrosion or leaks or maybe something else.
Many talk about embrittlement in steel piping and other equipment. But we have learned to deal with hydrogen safely over many decades of use in pipes and other equipment. We don't make them out of simple carbon steel but more sophisticated alloys.
Hydrogen is also more difficult to prevent leaking because the molecule is so small. I often specify explosion-proof rated equipment. If it is to be rated for hydrogen as well as say natural gas, the mating surfaces of a "lid" and "box" have to have a very fine finish.
Hydrogen introduces additional expenses, but we are well past technical issues of knowing how to transport and store it. At least in the refining industry, it is no big deal, just added expense.
Thanks much for your reply, you covered what I couldn’t remember. It does sound like natural gas fuel cell is making more sense.
I’ve never seen a price comparision, and don’t know if one is possible; but, before we got too far down the line it would make sense to at least estimate the price/mile.
Are you talking about fuel cells using either hydrogen or natural gas? If so, the technology is too new and limited in use for a meaningful price comparison. Both have been built many times but not in significant commercial production.
About a decade ago I tried to get into a pilot program for using a natural gas fuel cell as a stationary generator for reducing electric demand. One of the waste products of the fuel cell is heat. I had a swimming pool and was proposing a system to heat the pool. It never went anywhere and I wasn't willing to spend any significant money on my own.
Yes. For the reasons you mention, I don't know how one would estimate it, but obviously if by the time you got it into a car it was the equivalent of $20/gal gas...
Thanks for the info.
We were trying to compare a hydrogen fuel cell versus a natural gas fuel cell.
Do you know what source was used for the hydrogen fuel and was the government subsidized?
Disclaimer: Opinions posted on Free Republic are those of the individual posters and do not necessarily represent the opinion of Free Republic or its management. All materials posted herein are protected by copyright law and the exemption for fair use of copyrighted works.