to the flue gas. These chemical agents need to be cleaned in a separate cleaning process”, says Peter Blinksbjerg and adds:
installations, you would either dry cool it or take in seawater to cool it. But instead, we will harvest the residual heat with heat pumps and send it into the district heating network”, says Peter Blinksbjerg and continues: “The amine liquid with the absorbed CO 2 will release the CO 2 molecules when it is heated to 105 degrees Celsius. This heating process releases huge amounts of water vapor which holds much energy. It takes a lot of energy to evaporate it, and it releases a lot of energy when it’s being liquified by cooling. So, when liquifying the CO 2 before cooling it, you gain a lot of condensation heat from the water vapor, which we can harvest and make use of”. This is why a district heating network is of great importance when bringing down costs of carbon capture. The traditional energy loss from the capture process can be turned into a source of income. Increased demands for flue gas cleaning The traditional setup of a carbon capture unit is – basically speaking – an absorber and a desorber. At ARC, we’ve added two additional towers, one of which supports the goal of net- zero energy consumption while the other is added to cleanse the flue gas after the carbon capture process. “When the flue gas is led through the absorber, it is mixed with the amine liquid through a large surface area. But when the amine liquid captures the CO 2 , we cannot avoid that there can be other chemical agents that will go from the amine liquid
“When implementing carbon capture, we don’t want to introduce a potential new source of air pollution. Therefore, the fourth tower of the pilot capture unit is sort of a washing section with several possible ways of cleaning the flue gas with both water, alkaline liquid, etc.”. The steps ahead – and necessary preconditions The pilot carbon capture unit at ARC is capturing app. 850 kg. of CO 2 /day. It is a stepping stone towards a scaled-up demonstration unit planned to be operational in early 2023. The demonstration unit will capture 12 tons of CO 2 /day. By late 2025 the full-scale carbon capture unit will be operational, capturing 500.000 tons of CO 2 /year. To meet this ambitious time schedule, the right policies and economic incentives must be set up by the Danish Parliament very soon. Furthermore, full-scale carbon capture at ARC – as well as on any other plant – is dependent on the existence of a mature value chain. This means that both transportation (by pipeline and/or ship) and storage facilities (offshore or nearshore) must be available at competitive prices.
For further information please contact: Nils Thor Rosted, nitr@a-r-c.dk
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