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Old 01-18-2015, 02:27 PM   #11 (permalink)
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Its not the nitrogen or CO2 in the bio gas that causes the problems.
Its all the corrosive crap and water that comes out of the anaerobic pond with the gas.
The big problem to look out for is going to be corroding of the existing steel pipe line.
Now if the bio gas could be piped to a natural gas processer they could clean it up with ease and pump it into the existing distribution lines with out any problems. But the problem there is these natural gas processing centers tend to be in the middle of no where, very far from the intended market.

For now it appears the best use for most of the bio gas is just to burn it on site, in a boiler or in a power generation prime mover.

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Old 01-20-2015, 01:31 PM   #12 (permalink)
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Quote:
Originally Posted by oil pan 4 View Post
Yes the bio gas has to be purified but I don't know what that involves.
Since the large scale industrial food processors use way more methane than they can produce its just cheaper to blend and burn.
They have to separate CO2 & Co from the methane
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Old 01-20-2015, 05:24 PM   #13 (permalink)
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...For now it appears the best use for most of the bio gas is just to burn it on site, in a boiler or in a power generation prime mover.
This is definitely the best option.
Using it to power a generator and possibly feeding it into the grid avoids a lot of waste.
The fuel doesn't need to be transported away from where it is created.
It doesn't need energy expended to purify it.
It may not need to be compressed, saving more energy.
The energy generated can displace energy from a dirtier source, coal for example.
Methane is a more harmful gas to the environment than CO2, by collecting and burning the methane, pollution is reduced.
The solid waste from the process can be used as fertilizer.
The process scales well, from a small residential size set up through to a massive commercial landfill site.
If able to feed into the grid it becomes a new source of income from a previously wasted resource.
Complexity and cost are low allowing the process to be used in developing countries.
The gas can be used to fuel a generator but it can also be used for building heating, cooking, water heating, etc.

I am sure there are other benefits to a stationary set up but those are the first ones that come to mind.
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Old 02-03-2015, 03:35 AM   #14 (permalink)
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Here in Upstate New York we are slowly seeing a shift to CNG for fleet vehicles. Diesel conversions are being tried. The big economic question is in production of vegetable oils versus methane.
Actually I'm favorable to the usage of veg oils as fuel too, but for spark-ignition engines CNG and biomethane seem to make more sense at all than gasoline and ethanol.

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