Gas Pressurized Stripping (GPS) Process Based Technology

Gas pressurized stripping (GPS) seamlessly integrates CO2 separation and compression into one step -- with potential to eliminate the need for CO2 compression. Results from computer simulations indicate that the GPS process based technology can reduce the total parasitic power load by approximately 50% from the NETL baseline case.

GPS Features and Advantages

  • Uses off-the-shelf technology which is most suitable for large scale applications
  • High operation pressure with low stripping heat
  • High efficiency and low energy penalty due to the use of thermal compression
  • Minimal or no need for mechanical CO2 compression
  • Robust: able to accommodate single/multiple solvents absorption/stripping processes
  • Utilizes existing in-plant equipment by sharing units with conventional absorption/ stripping processes
  • Modular in design: Facilitates plant design
Issues with Conventional Strippers
  • Water vapor is used as stripping gas, thus the stripper operating pressure is limited by the vapor pressure at the stripper re-boiler temperature.
  • Low operating pressure results in a high ratio of PH2O/PCO2 at the top of the stripper
  • Water vapor is also a heat carrier -- leads to a high temperature gradient along the column and thus low thermal efficiency