Science Memes

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Entropy? Never heard of it. (lemmy.dbzer0.com)

submitted 4 days ago* (last edited 4 days ago) by [email protected] to c/[email protected]

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[–] [email protected] 111 points 4 days ago (32 children)

Just checked the numbers, for those interested.

A gas power plant produces around. 200-300kWh per tonne of CO2.

Capture costs 300-900kWh per tonne captured.

So this is basically non viable using fossil fuel as the power. If you aren't, then storage of that power is likely a lot better.

It's also worth noting that it is still CO2 gas. Long term containment of a gas is far harder than a liquid or solid.

[–] [email protected] 9 points 4 days ago (1 children)

You would presumably capture the carbon using excess solar and wind power, which is also the cheapest power there is, sometimes going negative

Is your capture number including the cost of liquifying the CO2 for storage?

[–] [email protected] 2 points 3 days ago (1 children)

We already have solar powered carbon sequestration systems, that require almost no maintenance over a period of a couple of hundred of years of operational life...

Trees.

[–] [email protected] 1 points 3 days ago* (last edited 3 days ago) (1 children)

Until they burn or rot and release the carbon back into the air

Also trees only grow where trees grew in the past, so growing new forests will only capture the carbon that was released when the old forest there was burnt or cut

[–] [email protected] 2 points 3 days ago* (last edited 3 days ago) (1 children)

Decomp still sequesters carbon.

Sure, burning them releases a portion back, but not most of it..

What do you think comprises ash?

[–] [email protected] 1 points 2 days ago

If you want to capture the most of the carbon, you cook the wood in an oxygen free environment turning it to charcoal and liberating volatile components (which could be used as carbon neutral fuel to run the furnaces)

Nothing can eat charcoal, so it could be stored cheaply

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