this post was submitted on 16 Feb 2025
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Science Memes

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submitted 2 months ago* (last edited 2 months ago) by [email protected] to c/[email protected]
 
(page 3) 50 comments
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[–] [email protected] 7 points 2 months ago (6 children)

Where are we putting all this CO2?

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

Synthetic fuels for air planes and rockets

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

Your beer/soda glass.

Once we get this tech shrunk down to the size of Nitrogen generators it's going to revolutionize the industry.

[–] [email protected] 3 points 2 months ago

I very much prefer CO2 in my drinks, some other carbon captures get you CO and I've heard that's not as good as a drink carbonator

[–] [email protected] 7 points 2 months ago

Old oil wells, preferably in high limestone areas

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[–] [email protected] 116 points 2 months ago (12 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] 7 points 2 months ago (2 children)

If you want to capture the CO2 from fossil fuel, it feels like it'd be easier to filter it out before dumping it in the atmosphere in the first place (apart from the obvious option of just not using fossil fuel)

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[–] [email protected] 25 points 2 months ago

It's also way easier to just stop digging up coal instead of inefficiently trying to get the exhaust from burning it partially back underground.

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

Co2 is liquified before storage.

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[–] [email protected] 35 points 2 months ago (5 children)

Who says you power that thing with fossil fuels? The real way to do that is via giant nuclear reactors or reactor complexes.

Fission power can be made cheaper per MW by just making the reactors bigger. Economies of scale, the square cube law and all that. The problem with doing this in the commercial power sector is that line losses kill you on distribution. There just aren't enough customers within a reasonable distance to make monster 10 GW or 100 GW reactors viable, regardless of how cheap they might make energy.

But DACC is one of the few applications this might not be a problem for. Just build your monster reactors right next door to your monster DACC plants.

[–] [email protected] 6 points 2 months ago (1 children)

Good luck building enough capacity in nuclear power to do that. Nuclear plants tend to be a lot more expensive and take a lot longer to build than anticipated.

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

Literally only in the US and Europe. Remove the profit motive and don't keep on inefficient construction companies and it's a quick process.

[–] [email protected] 4 points 2 months ago

There's no profit motive for large scale carbon capture anyway, so big CC plants and big nuclear plants would need the same political will.

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[–] [email protected] 14 points 2 months ago (2 children)

Solar and Wind are cheaper than nuclear now. The main problem is it's not sunny and/or windy every day. A carbon capture system doesn't need to be running 24/7 though.

If we build way more wind/solar than we use then the excess can dumped into things like this.

Sorry but the economics of nuclear just doesn't work for everything.

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[–] [email protected] 41 points 2 months ago* (last edited 2 months ago) (1 children)

But then the power generated by those reactors is better used to power things that burn fossil fuel in a less efficient way or to simply replace the fossil fuel powered electricity generators...

Quebec transports its electricity over more than a thousand kilometers, surely distance from nuclear reactors isn't an issue if you build the infrastructure around it.

[–] [email protected] 14 points 2 months ago (1 children)

Only when the last carbon based power plant is close, we can see if there's energy left to waste on that capture carbon machine.

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

Yes, it works as a "plan B" (along with many other things).

Don't loose hope. We can still win. Keep pushing for producing less CO2.

[–] [email protected] 15 points 2 months ago (3 children)

There are 3 use cases I've seen.

  • Making fossil fuel power stations "clean".

  • CO2 recovery for long term storage.

  • CO2 for industrial use.

It's no good for the first, due to energy consumption. This is the main use I've seen it talked up for, as something that can be retrofitted to power plants.

It's poor for the second, since the result is a gas (hard to store long term). We would want it as a solid or liquid product, which this doesn't do.

The last has limited requirements. We only need so much CO2.

The only large scale use case I can see for this is as part of a carbon capture system. Capture and then react to solidify the carbon. However, plants are already extremely good at this, and can do it directly from atmospheric air, using sunlight.

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[–] [email protected] 39 points 2 months ago (9 children)

Even if we went to zero emissions soon, we'd still want to decrease CO2 over time to reverse the effects of climate change. Capturing co2 is always going to be much more energy intensive than not emitting it in the first place, but sometimes you don't have another choice.

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[–] [email protected] 4 points 2 months ago (1 children)

Cant you just feed the CO2 from the nearest coal power plant?

[–] [email protected] 5 points 2 months ago

I really think we can capitalism our way out of a capitalism caused climate crisis who's with me and rex tillerson

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