Low Temperature CO₂ separation

The aim of the project is to map the techno-economic potential for low-temperature CO₂ separation as a basis for future projects. A key task in the project is simulations of low-temperature repair of CO₂ in the following processes:

• CO₂-rich synthesis gas in an Integrated Gasification Combined Cycle (IGCC) for power generation
• Flue gas from a coal-fired power plant (a hybrid process in combination with bulk separation of CO₂ with polymeric membranes)
• A CO₂-rich stream downstream of a palladium membrane that separates hydrogen from a synthesis gas (concept study for hydrogen production from coal)

Techno-economic evaluations of the first two concepts will be carried out. Efficiencies and costs for power production with CO₂ capture based on low-temperature technology must be compared with alternative mature technologies.

In the concept of low-temperature CO₂ separation, known components (compressors, turbines, heat exchangers, phase separators) are combined in such a way that CO₂ is separated in the liquid phase from a CO₂-rich stream under high pressure. For processes where CO₂ is separated from synthesis gas, the rest of the gas stream consists mainly of hydrogen that can be used as fuel in power production or sold as an end product. Liquid phase CO₂ can either be transported by ship or pumped up in pressure for pipe transport.