[Diy_efi] Hydrogen

[gpbeau at cox.net]

Good points, Greg.

We also have a grant (I guess we're one of those grant prostitutes you mentioned) to study the economics of electrolyzing water from nuclear-produced energy. Having Palo Verde in our back yard helps with that.

Yes--ASME, not ASTM. One of the hazards of trying to type with a 4-year-old buzzing around your chair.

316L (austenitic) stainless does not suffer from embrittlement. The 400-series stainless (martensitic) and some 304 stainless will suffer embrittlement. Talk to the chaps at Swagelok for details.

We have run engines with as high as 13:1 CR with 15 psi of boost. You need good cranks, rods and pistons to survive this and very good calibration to keep from having detonation. Our current Chevy maintainst the stock CR (10:1 or so) with 15 psi of boost and is a very happy camper.

I have not seen RON comparisons for Hydrogen.

Stoichiometric flame temperatures are rather high, compared with gasoline. Lean flame temperatures are lower compared to gasoline which is what allows an engine to burn H2 without significant NOx production. We were seeing EGTs in the 800 (F) range. 

Yes, lack of lubricity is a problem for valve faces and injectors. 

-Garrett- 



---- "bearbvd at mindspring.com" <bearbvd at mindspring.com> wrote: 
> 
> 
> Original Message:
> -----------------
> From: Garrett P. Beauregard gpbeau at cox.net
> Date: Thu, 7 Sep 2006 18:55:30 -0700
> To: diy_efi at diy-efi.org
> Subject: RE: [Diy_efi] Hydrogen
> 
> 
> Hydrogen is generated via electrolysis (yes--expensive)
> 
> Perhaps this would be a credible way to do it with electricity generated
> with nuclear power/MHD. Ya just gotta LOVE it when California (and other)
> greenies want to export more pollution to the four corners area !!!
> 
>  and stored in ASTM
> hydrogen cylinders.
> 
> This would be a BIT more credible as being safe if it were ASME who were
> certifying the cylinders. Perhaps your saying ASTM was a typo ??? If a
> pressure vessel doesn't carry the ASME cloverleaf stamp, don't pharkin'
> trust it !!
> 
> As for fittings, the gold standard is Swagelok or Parker stainless steel
> compression fittings:
> 
> http://www.swagelok.com/search/find_products_home.aspx?SEARCH=/search/Tube+F
> ittings+and+Tube+Adapters/id-10000212/type-1
> 
> No embrittlement
> with stainless, 
> 
> Huh ??? I'd like to see a few credible references on this statement !!!!
> 
> As for engines, we have seen no ill affects from the hydrogen gas.
> 
> What compression ratio are they running ??? Any credible research on the
> equivalent of 'RON' for H2 as a fuel ??
> 
>  Of
> course, one would use hardened valve faces to deal with the heat of
> combustion.
> 
> Not so much the heat as the lack of lubricity--- same situation as a
> methane (NG) fueled engine.
> 
> What is the adiabatic flame temp of H2 in air (and same number for gasoline
> in air)??? I don't recall either offhand, but do recall it being 'not all
> that high' because of the high heat of dissociation of H2. Do recall things
> like C2H2 (acetylene) and MAPP gas being FAR higher---
> 
> 
> Now, don't ask me if Hydrogen is the fuel of the future because the jury is
> not impaneled yet.
> 
> This juror won't see much credibility in the arguements for it as any sort
> of a useful fuel until folks (including the entire herd of grant
> prostitutes who love to expound on the subject) start admitting that water
> vapor is a FAR more powerful greenhouse gas--particularly at low
> stratospheric elevations--than CO2 is !!!!
> 
> Not to mention until some of what could be done for home heating, cooling,
> and dhw (with economics that are entirely reasonable TODAY) with small
> (house size) sub-critical reactors fueled with 'depleted' U (slugs of
> U-238) such as are used as sabots in anti tank projectiles--- gets DONE !!!
> We have HUNDREDS (perhaps thousands) of TONS of 'depleted' U, it's criminal
> that we are not USING it when practical tech to do so EXISTS TODAY !!!
> 
> For information sake, one must understand that 'depleted' U is the very
> nearly pure U-238 which is the by-product of  an 'enrichment' process which
> removes the naturally occurring (small) portion of the U which is the U-235
> isotope--to produce 'enriched' U--namely U which contains a higher
> percentage of U-235 than what occurs in nature for fuel (in CRITICAL
> reactors) or weapons purposes.
> 
> Greg 
> 
> Greg
> 
> 
> Garrett
> 
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