5 ms·

It’s only practical on mixtures with high co2 gas concentrations

mdf 6y ago
Would inside a chimney work?
extropy 6y ago
From the abstract it seems to be very applicable to combustion exhausts (coal/gas plants) and consuming 5-10% of the combustion energy to recapture the CO2. Hard to tell what is the required CO2 concentration without the full article. Typical combustion exhaust seems to be ~10% of CO2, https://en.wikipedia.org/wiki/Flue_gas https://en.wikipedia.org/wiki/Flue_gas Edit: spelling.
raverbashing 6y ago
I wonder how research is doing to concentrate CO2 from the PPM amounts we have "in regular air" There are at least two low-hanging fruits that make it "easier": CO2 is heavier than other important gases and mildly polar.
- magicalhippo 6y ago
  Plant lots of trees or similar, then burn them for electricity and capture the CO2 from the smoke. Compared to a lot of the other proposals out there it almost sounds plausible.
  - lostapathy 6y ago
    Or skip a step. Turn the trees into lumber and build something with it. Long-lived wooden structures sequester carbon until they are abandoned and rot.
  - marcusverus 6y ago
    Why not just do a partial burn and reduce the remainder to charcoal? It would be much cheaper, require no chemicals, and the end product is pure carbon, which would be easier to store. You could literally dump it in a pile and deal with it later.
    - idiotsecant 6y ago
      Making charcoal is not energy-positive and still only results in about 50% carbon capture, best case scenario. Burning it in a biomass plant with good carbon capture does better and displaces carbon-emitting generation processes at the same time. As an added bonus biomass plants are excellent 'baseload' type plants, a feature that wind, solar, etc are missing without expensive storage and complex management schemes.
AyrtonB 6y ago
Such as flue gases from fertiliser, cement, steel and power plants ... which make up a sizeable chunk of our emissions. We should be targeting CO2 capture at point-sources wherever possible. Why wait until it's diffused into the atmosphere before trying to capture it?

mdf 6y ago

Would inside a chimney work?

From the abstract it seems to be very applicable to combustion exhausts (coal/gas plants) and consuming 5-10% of the combustion energy to recapture the CO2. Hard to tell what is the required CO2 concentration without the full article. Typical combustion exhaust seems to be ~10% of CO2, https://en.wikipedia.org/wiki/Flue_gas https://en.wikipedia.org/wiki/Flue_gas Edit: spelling.

raverbashing 6y ago

I wonder how research is doing to concentrate CO2 from the PPM amounts we have "in regular air" There are at least two low-hanging fruits that make it "easier": CO2 is heavier than other important gases and mildly polar.

magicalhippo 6y ago
Plant lots of trees or similar, then burn them for electricity and capture the CO2 from the smoke. Compared to a lot of the other proposals out there it almost sounds plausible.
- lostapathy 6y ago
  Or skip a step. Turn the trees into lumber and build something with it. Long-lived wooden structures sequester carbon until they are abandoned and rot.
- marcusverus 6y ago
  Why not just do a partial burn and reduce the remainder to charcoal? It would be much cheaper, require no chemicals, and the end product is pure carbon, which would be easier to store. You could literally dump it in a pile and deal with it later.
  - idiotsecant 6y ago
    Making charcoal is not energy-positive and still only results in about 50% carbon capture, best case scenario. Burning it in a biomass plant with good carbon capture does better and displaces carbon-emitting generation processes at the same time. As an added bonus biomass plants are excellent 'baseload' type plants, a feature that wind, solar, etc are missing without expensive storage and complex management schemes.

AyrtonB 6y ago

Such as flue gases from fertiliser, cement, steel and power plants ... which make up a sizeable chunk of our emissions. We should be targeting CO2 capture at point-sources wherever possible. Why wait until it's diffused into the atmosphere before trying to capture it?