[Stoves] Biogas backpack

[Crispin Pemberton-Pigott]

Dear Ron

 

Good to hear from you in the new year.

 

>I think you misunderstood the article. The bag is only for transport and temporary storage. They take the empty (and some dung) to a biogas producer, get it filled and go home to cook with it. It is supposed to be about a day's cookin' worth.

I am with David House www.completebiogas.com on this one: it is a portable digester with nothing but gas in it! J 

He writes, “It's actually a gas bag, not a digester. Even so, it's an excellent innovation, and a worthy addition to the armamentarium, wherever it can serve as a means of transport in connection with a large digester near any large population. 

And as well, from my point of view, it's also a bit ironic, since the very sturdy bag, selling for ~$US38, could actually be a digester if it had two additional pipes (an inlet and an outlet), and further that since it's about a cubic meter in volume, it would produce about a cubic meter of gas every day, if fed and kept warm.”

I think David is working on a bag digester himself. The transport of gas is interesting. If it turned out to be attractive as a cooking fuel (and delivery system) the users would perhaps be convinced to install their own systems. I am not convinced that a minibus would accept the gas ‘package’ without fear or charge.

It is a lot lighter than a load of wood and the walking distance might be less. I wonder if a tire on a rim might be as good, and could be pumped by hand. Will a tire hold a useful volume of gas if hand pumped?

Regards

Crispin

 

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