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Re: using natural gas to generate electricity
Hey Mr Mac,

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Thanks for the posting, also the previous 'disclaimer' which was
pretty intuitive as to the resultant replies.

It seems ideas are not worth posting lately as people to to take ideas
out to a back alley
and beat them up :-)

I'd like to suggest that you continue thinking and posting ideas
because at least
some people may be able to offer constructive criticism.

The replies you received could have been a tiny bit more positive I
think...






Re: using natural gas to generate electricity
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A couple of thoughts about your idea. Don't want to knock it
totally on the head as it has some merit, but just a few
pluses and minues to consider.

A genny needs a constant speed input, most designs require
3000RPM to deliver 50Hz output. You can of course gear up or
down the engine so the engine doesn't need to operate at
exactly 3000RPM (although gearing will introduce losses),
but unless you have a CVT (ie more losses), the engine will
need to stay at a constant speed. Higher speed = higher
output, but the engine will die faster. Lower speed it will
last longer, but won't have as much power. I'd suggest that
those taxis with 1,000,000km on the clock mostly run at
around the 1500-2000rpm range, where 50-60kW will be all
you'll get out of a holden V6 on petrol, less on gas. To get
the 100kW out of it, you'd need to lift your speed to around
3000rpm, which would shorten life.

Alternatively, given that you'd need to be able to take the
engine offline for servicing, you could have 2 engines but
have them running at eg 2000RPM. Your thermodynamic
efficiency would drop, but at the lower RPM you'd get much
better engine life, and you'd now have some level of
redundancy (albeit only at off-peak loads).

As a plus, by running at a constant speed, you can do things
like altering the camshaft for optimal tuning which will get
a bit more power and efficiency. Startup and warming up are
the worst times for engine wear, so with that reduced the
engine will last longer. So I reckon if you ran at 2000RPM,
with regular maintenance, good quality oils etc, you
probably would get the equivalent of 1,000,000km @ 60km/hr
(16000hrs).

As for overall cost effectiveness, well if you were doing
this on a commune or something where you could keep the
government at bay, then it probably would be viable. As soon
as you start involving regulation, your costs will skyrocket.

Looking at regular electricity, the cost per MWH of coal
generated electricity is around 3c. Some of the 20+c that we
pay retail is used up in distribution costs, but the vast
majority of it is eaten up in bullshit like "green energy
targets", lining the pockets of fatcat retail suppliers, and
buying electricity off the people who got govt subsidised
solar system under the upper-middle class welfare scheme.



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--
What is the difference between a duck?

Re: using natural gas to generate electricity
why is every one so worried about a v6 engine lasting  ?   NO ONE seems to
be worried about portable generators  lasting  and no one is worried about
power stations  lasting.



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Re: using natural gas to generate electricity
$ 2000 for  holden v6 ?? u gotta be kidding  ,  !!! you can get a whole vn
v6 auto  complete / defected maybe/rough for $800 or under !!!



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Re: using natural gas to generate electricity
dont  forget  the v6 isnt  pulling over a ton of steel , its just turning a
generator,   ALOT  less load SO SHOULD GET PRETTY good economy.

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