Franco-Crosti Boiler for Steam Trains

[NW Modeling List]

Bill:

What you describe also applies to railway and, as far as I know, marine and
stationary diesel  engines.

Dave Phelps

On Sun, Feb 9, 2020 at 3:10 PM NW Modeling List via NW-Modeling-List <
nw-modeling-list at nwhs.org> wrote:

> At least in the automotive and aeronautics industries, both turbochargers
> and superchargers send fresh air (never exhaust gases) to the engine
> (whether  carbureted or fuel injected).  Both compress the fresh air gas
> entering the combustion chamber (cylinders) to increase the quantity of O2
> available so more fuel can be burned in each stroke producing more power.
> Where they differ is that superchargers are driven mechanically (by belt or
> gears) off of the engine power output (usually the crankshaft).
> Turbochargers are driven by diverting expanding exhaust gas through a
> turbine that in turn drives a compressor.
>
> Not sure why a different arrangement would be used in the railroad
> industry (about which I know nothing), but if that is indeed the case the
> difference would be interesting, as would be understanding why.
>
> That said, I am skeptical about reinjecting partially combusted exhaust
> gas as that would reduce available O2 and reduce the power output of any
> combustion engine.  i do not understand why there would be a different
> result in a steam boiler as the chemistry of combustion to produce heat is
> fundamentally the same.  One would want more available O2 to burn fuel
> (wood, coal, oil) more rapidly to produce more heat and hence more steam.
>
> Bill Demarest
>
> Sent from my iPhone
>
> On Feb 9, 2020, at 8:03 AM, NW Mailing List <nw-mailing-list at nwhs.org>
> wrote:
>
>  Gents,
>
> This email with my comments is the one that I meant to send you.
> Thanks,
> Norris
>
> Norris Deyerle
> Blue Ridge Chapter, National Railway Historical Society Chairman of
> Virginia's Rail Heritage Region Partners
> Info: www.blueridgenrhs.org
> 744 Chinook Place
> <https://www.google.com/maps/search/744+Chinook+Place+%0D%0ALynchburg,+Virginia+24502?entry=gmail&source=g>
> Lynchburg, Virginia 24502
> <https://www.google.com/maps/search/744+Chinook+Place+%0D%0ALynchburg,+Virginia+24502?entry=gmail&source=g>
> -4908
> Cell: 434-851-0151
> ------------------------------
> *From:* NORRIS DEYERLE <RAILCOW at msn.com>
> *Sent:* Saturday, February 8, 2020 4:17:39 PM
> *Subject:* Fw: Franco-Crosti Boiler for Steam Trains
>
> Railroad friends,
> Wayland sent me this link that his son Dan sent him. Dan is a professional
> railroad employee. The concept made me think about superchargers and
> turbochargers on engines. Various forms of super and turbo chargers were
> used on car, truck, boat and airplane engines! In simple terms I explained
> the differences to my car customers between the two that a supercharger
> forced fresh air through the engine to boost power where as a turbocharger
> recirculated partially burnt exhaust gas back through the engine to be
> burned a second time. I guess it could be argued that both had their
> advantages and disadvantages.
> Check out this video.
> Thanks Wayland!
> Norris
>
> Norris Deyerle
> Blue Ridge Chapter, National Railway Historical Society Chairman of
> Virginia's Rail Heritage Region Partners
> Info: www.blueridgenrhs.org
> 744 Chinook Place
> <https://www.google.com/maps/search/744+Chinook+Place+%0D%0ALynchburg,+Virginia+24502?entry=gmail&source=g>
> Lynchburg, Virginia 24502
> <https://www.google.com/maps/search/744+Chinook+Place+%0D%0ALynchburg,+Virginia+24502?entry=gmail&source=g>
> -4908
> Cell: 434-851-0151
> ------------------------------
> *From:* Wayland Moore <waym00re at yahoo.com>
> *Sent:* Saturday, February 8, 2020 3:24:53 PM
> *To:* Norris Deyerle <railcow at msn.com>
> *Subject:* Fw: Dan sent
>
> Check this out, the stack is on the side of the engine about half way
> back.  Look at the video.
>
>
> Franco-Crosti boiler
> <https://en.m.wikipedia.org/wiki/Franco-Crosti_boiler>
> The Franco–Crosti boiler is a type of boiler used for steam locomotives.
> It was designed in the 1930s by Attilio Franco and Dr Piero Crosti.
> The main difference between it and conventional feedwater heaters widely
> used on the continent is that the Franco-Crosti boiler uses both exhaust
> steam and exhaust gases from the firebox. Conventional feedwater heaters
> only use exhaust steam.(114 kB)
>
> https://www.youtube.com/watch?v=nIdgsghT3ak&feature=youtu.bem
> <https://www.youtube.com/watch?v=nIdgsghT3ak&feature=youtu.be>
> 1973 Vapore in Val Pusteria 1/Dampf im Pustertal 1 - YouTube
> <https://www.youtube.com/watch?v=nIdgsghT3ak&feature=youtu.be>
> nell'ottobre del 1973 sono stato per la prima volta in Val Pusteria. Ho
> girato le locomotive a vapore del Gruppo 741. Ho visto il 741 262, 142, 046
> Il filmato è stato girato in Super-8 e con ...
> www.youtube.com
>
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-- 
Regards, Dave
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