New insight into Alstom's CO2 Capture process
Watch our latest video from the world’s largest facility for testing and improving CO2 capture at Mongstad, Norway, and get a rare glimpse inside the innovative chilled ammonia plant under construction by Alstom.
TCM will test two different technologies, from Aker Clean Carbon and Alstom, respectively, for capture of CO2 from two flue gas sources with different CO2 content.
The objective of the testing is in part to qualify the technologies for large-scale cleaning of exhaust gas, while simultaneously developing cost-effective technology solutions.
In this uniqe video, Kathrine Næsland from Alstom is guiding the viewers through the plant under construction, and for the first time we get to see the inside of the absorption tower where the CO2 in the flue gas from the refinery and the combined heat and power station will be captured.
The knowledge gained through demonstration and testing at Mongstad will prepare the ground for CO2 capture initiatives to combat climate change globally. TCM will not only be one of the first large scale demonstration plants, but also the first of its kind to test two different types of capture technologies from two different sources of CO2, side-by-side.
Alstom’s Chilled Ammonia post-combustion technology chosen for testing at TCM is consists of separating CO2 from the exhaust gases using chilled ammonia as the solvent to absorb the CO2.
How does the technology work?
Flue Gas Cooling:
The exhaust gas, or flue gas is passed through a flue gas conditioning unit to condense the water and residual emissions which reduces the volume of gas to be treated.
The conditioned gas then passes through a column where the CO2 is absorbed from the flue gas through contact with ammonia solution, forming ammonia solution rich in CO2. The treated flue gas then passes through additional columns to recover any ammonia vapour to release a cleaned flue gas to the atmosphere.
High Pressure Regeneration:
The ammonia solution, now rich in CO2, is pressurised and pumped into a regenerator column where heat is applied to separate CO2 from the solution, where the CO2 can then be further compressed to facilitate future transport and storage. The ammonia solution is then returned to the absorber for reuse.
Read about Aker Clean Carbons amine technology here.
TCM is a joint venture between the Norwegian state, Statoil, Shell and Sasol. Operations are scheduled to begin at the beginning of 2012.