DAC – DC Hybrid System

SGE had developed its novel Carbon Capture Technology DAC-DC Hybrid system for large scale direct air capture (DAC) and point source capture. In order to capture CO₂ for free as a by-product from large scale district cooling or industrial cooling process.

In order to direct capture CO₂ as a free by-product with  a simple-cheap technology from large scale district cooling and industrial cooling process, The present invention is utilizing the large difference in thermodynamics properties between the main components of air or flue gas ( N₂ , O₂ , Ar₂ CO₂ and H₂O) to change the phase of CO₂ gas into a liquid phase to separate it with condensed water while keeping N₂,O₂ and Ar₂ at their original gas phase.

As CO₂ changes its gaseous phase into a liquid phase under much less temperature and pressure than the other air components (N₂, O₂ and Ar₂). So the present invention is working based on compressing and cooling air/flue gas to the minimum limit of liquefying CO₂ only (Example : 100 Bar/20°C within a novel gases stratification tower) and separate it mechanically as a liquid for sequestration or utilization while keeping N₂, O₂ and Ar₂ at their original gaseous phase overlaying the liquefied CO₂ (according to their densities) to be released later as cooled-pressurized dry  air stream for district air cooling or for industrial cooling, with recovering the compressional thermal heat energy and the expansion energy of the released dry-cooled-pressurized N₂ , O₂ and Ar₂ gases.

For example under 100 bar / 20°C Celsius

Main Components  of Air (or flue gas)Pressure BarTemp. CelsiusDensity  Kg/m3Thermodynamic Phase
Nitrogen100 Bar20°C115Gas
Oxygen100 Bar20°C138Gas
CO₂100 Bar20°C856Liquid
Water100 Bar20°C1000.0Liquid

DAC-DC Plan View

System Plan View

  • Deep saline aquifers are suitable for safe CO₂ sequestration , because they are more common than oil and gas fields, especially near +90% of urban areas around the world where most CO₂ is emitted.  Also, fortunately, the vast majority of which have permeability, porosity. and sealing characteristics that oil and gas reservoirs process so they can be used for safe storage.
  • In addition, saline aquifers usually have valuable features that can help to underpin CO₂ geo-storge becoming a profitable business, including: