Kryogen CO2-fangst – optimering af energieffektiviteten (COLDCO2-2)

Challenge

The project was initiated due to the need for an energy- and cost-efficient technology for CO2 capture, where point sources were ideal for CO2 capture. The project aimed to address challenges within the cryogenic technology for CO2 capture. CCC (Cryogenic CO2 Capture) had proven to be significantly more energy- and cost-efficient than CO2 capture using amine technology, which was considered by many at the time to be the most mature technology for CO2 capture.

Solution

The goal of the project was to optimize the CCC technology for both plants with high and low CO2 concentrations. Brickworks typically have a low CO2 concentration, while high CO2 concentrations are particularly found in cement plants with oxygen-enriched air, e.g., with oxygen content in the combustion air of up to 30% or even higher. In both process plants, optimization could occur by utilizing condensed products from the flue gas in cases where there were opportunities for recycling, and where it created value.

The project also aimed to explore the effect of combining the CO2 capture plant with a sector coupling option through refrigerant storage, so that the operation of the CCC plant could help balance the energy system’s production of fluctuating energy.

The project was supported by the Ministry of Education and Research

Impact

The expected results of the project were technical investigations and a comprehensive technical and economic assessment of using cryogenic CO2 capture from plants with both high and low CO2 concentrations in the flue gas. This assessment would include the primary optimization opportunities of a CCC plant, including the benefits from sector coupling and the recovery of valuable products from the flue gas.

The value creation of the project was an investigation into how challenges with CO2 capture could be addressed in an integrated technology, with cost reductions achieved through the optimization of the entire system.