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Join Date: Jul 2014
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Compressing Homemade Methane

07/31/2014 6:18 PM

I'm looking for some advice pertaining to compressing methane. I would like to build a biodigester and collect the methane using an air compressor and a propane tank. My main concern is whether or not a standard air compressor is safe enough to move methane. It will only run in small bursts so im not too worried about anything overheating.

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#1

Re: Compressing homemade methane

07/31/2014 6:53 PM

Here's one in action....

https://www.youtube.com/watch?v=kzSiL3h2pUU

Blurb...

http://www.motherearthnews.com/diy/methane-gas-energy-generator-zmaz75mazgoe.aspx#axzz395YdAerC

mmmmm....

http://www.mckenziecorp.com/tip13.htm

There are certain safety requirements....remember the gas is explosive...

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#5
In reply to #1

Re: Compressing homemade methane

08/05/2014 8:44 AM

And, you have to watch for other constituents in the gas that is produced. the methane that comes from anaerobic digestion is not always "pure" methane, there are many other byproducts, in particular H2S is produced, an acid that will eat away any steel components of a compressor, not to mention the amount of water vapor that is produced as well, another natural oxidizer. In our pilot plant I ended up with a stainless water separator, one that I found designed for oil field and refinery use, but we never got as far as compressing the gas. One easy way to store it is just using a bladder.

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#2

Re: Compressing homemade methane

08/01/2014 3:38 AM

The biggest problem with using an air compressor is the electrical connection to the motor, which will not be certified for use in the potentially explosive atmosphere that will surround it should anything leak. Ignoring this makes one very unpopular with fire insurance companies and it is important that one doesn't become a candidate for the Darwin Awards.

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#3

Re: Compressing Homemade Methane

08/01/2014 10:32 PM

Take care
Methane mixture with air is very dangerous and explosive.
And you can't smell its pesence.

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#4

Re: Compressing Homemade Methane

08/02/2014 7:06 AM

Bio-digesting horse manure was popular on farms 100 years ago, and commercial units are readily available. See (www.naturesfurnace.com). Many of these commercial units also caused fires, so proceed with caution. Remember, "she was only a stableman's daughter, but all the horsemenuer".

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