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Hairyloon

Joined: 20 Nov 2008
Posts: 15425
Location: Today I are mostly being in Yorkshire.

Posted: Fri Jun 06, 14 5:46 pm Post subject:

Nick wrote:

Which is why they're built at the back of sewage works, or slurry pits or fed by lorry loads of waste pork scratchings.

Well obviously, but that is about the size of Plymouth. Not a big city as cities go, but I would hesitate to call it "small".

Definitely a problem that wants addressing.

Nick

Joined: 02 Nov 2004
Posts: 34535
Location: Hereford

Posted: Fri Jun 06, 14 5:56 pm Post subject:
Where are you getting a figure of 200g from? Certainly no one I know creates that little waste daily.

Nick

Joined: 02 Nov 2004
Posts: 34535
Location: Hereford

Posted: Fri Jun 06, 14 5:57 pm Post subject:
Look at the link, every one outside the water industry is there and it tells you the size and output rate. Much below that currently can't be done viably.

Hairyloon

Joined: 20 Nov 2008
Posts: 15425
Location: Today I are mostly being in Yorkshire.

Posted: Fri Jun 06, 14 6:01 pm Post subject:

Nick wrote:

Where are you getting a figure of 200g from? Certainly no one I know creates that little waste daily.

Encyclopedia Britannica. I didn't think it sounded enough either, but google didn't readily contradict it.

Nick

Joined: 02 Nov 2004
Posts: 34535
Location: Hereford

Posted: Fri Jun 06, 14 10:43 pm Post subject:
If they were only supplied by dry, pure poo you might be right.

Hairyloon

Joined: 20 Nov 2008
Posts: 15425
Location: Today I are mostly being in Yorkshire.

Posted: Fri Jun 06, 14 11:15 pm Post subject:

Nick wrote:

Essentially, the setup problems, monitoring and control is the same for a large and small set up...

OK, it seems to me that most of this problem stems from the fact that methanogenesis is not an exact science: any time you make biogas, you get an uncertain mix of gasses.

So what if we inject hydrogen?
Electrolysis is an exact science: if you set out to produce hydrogen, then you can be reasonably certain that what you produce is fairly pure hydrogen so all you would need to do is meter the volume.

Nick

Joined: 02 Nov 2004
Posts: 34535
Location: Hereford

Posted: Sat Jun 07, 14 8:23 am Post subject:
Yeah. They're doing that. And working on the storage and use of it. They even have a few hydrogen pumps you can fill your car up with free.

Hairyloon

Joined: 20 Nov 2008
Posts: 15425
Location: Today I are mostly being in Yorkshire.

Posted: Sat Jun 07, 14 8:32 am Post subject:

Nick wrote:

Yeah. They're doing that...

I would expect them to be doing that. I'm wondering about us doing that...

Nick

Joined: 02 Nov 2004
Posts: 34535
Location: Hereford

Posted: Sat Jun 07, 14 8:45 am Post subject:
It's a relatively public resource. Drop them an email and they'll share their research and findings. Nice people with great facilities and they reckon there'll be more than 300 new plants in the next couple of years.

Hairyloon

Joined: 20 Nov 2008
Posts: 15425
Location: Today I are mostly being in Yorkshire.

Posted: Sat Jun 07, 14 9:26 am Post subject:

Nick wrote:

It's a relatively public resource.

Meaning these: https://www.biogas-info.co.uk/ ?

Hairyloon

Joined: 20 Nov 2008
Posts: 15425
Location: Today I are mostly being in Yorkshire.

Posted: Sat Jun 07, 14 9:37 am Post subject:

dpack wrote:

for small scale gas production i recon wood distillation is a goer but storage etc have issues...

It depends what you are trying to run: how big a bucket of gas do you need to roast a dinner?
Is not hard to pump it into a bottle either.

Quote:

and really for a generator you might as well burn wood in a steam engine

Except that I have a selection of infernal combustion engines sat around wanting a job...
On that point I have a challenge to put on the table: how to run a two stroke engine on gas?

Nick

Joined: 02 Nov 2004
Posts: 34535
Location: Hereford

Posted: Sat Jun 07, 14 10:35 am Post subject:

Hairyloon wrote:

Nick wrote:

It's a relatively public resource.

Meaning these: https://www.biogas-info.co.uk/ ?

No, the centre of excellence at South Wales uni.

Hairyloon

Joined: 20 Nov 2008
Posts: 15425
Location: Today I are mostly being in Yorkshire.

Posted: Sat Jun 07, 14 10:39 am Post subject:

Nick wrote:

Hairyloon wrote:

Nick wrote:

It's a relatively public resource.

Meaning these: https://www.biogas-info.co.uk/ ?

No, the centre of excellence at South Wales uni.

Ah. I'd missed the link to them...

dpack

Joined: 02 Jul 2005
Posts: 45521
Location: yes

Posted: Sat Jun 07, 14 3:32 pm Post subject:

[quote="
On that point I have a challenge to put on the table: how to run a two stroke engine on gas?[/quote]

i think the american chap that makes wood gas has some "scrapheap challenge"type instructions .iirc it looked like a pipe into the inlet on the engine side of the place the carb would normally be

how you get oil in to replace the oil in the fuel for a 2 stroke im not sure

i know quite a few vehicles were converted to low pressure town gas(big bag on roof)during ww2

Hairyloon

Joined: 20 Nov 2008
Posts: 15425
Location: Today I are mostly being in Yorkshire.

Posted: Sat Jun 07, 14 5:11 pm Post subject:

dpack wrote:

Quote:

On that point I have a challenge to put on the table: how to run a two stroke engine on gas?

how you get oil in to replace the oil in the fuel for a 2 stroke im not sure

Yes. That is the tricky bit.

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