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> This seems to involve feeding the exhaust of a power plant into a process which cools the exhaust to the point where CO2 dry ice (and other pollutants) desubl

> This seems to involve feeding the exhaust of a power plant into a process which cools the exhaust to the point where CO2 dry ice (and other pollutants) desublimates out of the exhaust and is then extracted for various industrial/commercial applications. Based on what you said, the dry ice would sublimate and just re-release the carbon into the atmosphere. Or did you have a different place for this carbon to go? If so, how are you planning to keep the dry ice cool, and how are you planning on producing it in the first place?

gooseus 7y ago
The dry ice itself would be stored in well-insulated containers, and cold generated from these containers would be useful for refrigeration with the CO2 that does sublimate out as the containers heat up being feed-stock to enrich greenhouses, with the rest would being recycled into the pyrolysis exhaust, and thus back into the dry ice production. One of the things I'm curious about is the efficiency of the dry ice production at various CO2 levels and the physical quantities of material that would be expected from such these kinds of processes. The general idea is that you would be creating a system for accumulating/concentrating carbon as CO2 solid/gas, as well as in biomass, and at the same time creating two large energy differentials that could also be put to work. The major input to this system (assuming the numbers can work) would be photosynthetics and photovoltaics.
- Skunkleton 7y ago
  AFAIU most of our industrial CO2 (for dry ice, soft drinks, etc) comes from refining natural gas exhaust. From there, if you want to make a dry ice block, you have to take it through a very energy cooling process (similar to how air conditioning works) to create a liquid, and then through a second compression and cooling process to turn it into a solid. It is likely that the process of turning a given volume of CO2 into a solid would produce more emissions than it sequestered. You cannot assume that green energy will be used for this sequestration because if green energy were available at this scale, you wouldn't have the CO2 on your hands in the first place. On the demand side we already collect as much CO2 as we need from e.g. natural gas power plants. We don't have a use for any more. It will just sublimate and be re-released into the atmosphere, or into some containing vessel.

gooseus 7y ago

The dry ice itself would be stored in well-insulated containers, and cold generated from these containers would be useful for refrigeration with the CO2 that does sublimate out as the containers heat up being feed-stock to enrich greenhouses, with the rest would being recycled into the pyrolysis exhaust, and thus back into the dry ice production. One of the things I'm curious about is the efficiency of the dry ice production at various CO2 levels and the physical quantities of material that would be expected from such these kinds of processes. The general idea is that you would be creating a system for accumulating/concentrating carbon as CO2 solid/gas, as well as in biomass, and at the same time creating two large energy differentials that could also be put to work. The major input to this system (assuming the numbers can work) would be photosynthetics and photovoltaics.

Skunkleton 7y ago
AFAIU most of our industrial CO2 (for dry ice, soft drinks, etc) comes from refining natural gas exhaust. From there, if you want to make a dry ice block, you have to take it through a very energy cooling process (similar to how air conditioning works) to create a liquid, and then through a second compression and cooling process to turn it into a solid. It is likely that the process of turning a given volume of CO2 into a solid would produce more emissions than it sequestered. You cannot assume that green energy will be used for this sequestration because if green energy were available at this scale, you wouldn't have the CO2 on your hands in the first place. On the demand side we already collect as much CO2 as we need from e.g. natural gas power plants. We don't have a use for any more. It will just sublimate and be re-released into the atmosphere, or into some containing vessel.