Chilled ammonia technology
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.
Chilled ammonia technology, although less widely used than amine technology, holds potential for lower energy consumption per tonne of CO2 captured. This process will be tested at large scale at TCM, and if this technology can be qualified, it will provide the world with a proven technology with reduced costs.
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 – and thereby reducing the size of equipment necessary.
The Absorber:
The conditioned gas then passes through a column where the CO2 is absorbed from the flue gas through contact with ammonia solution, forming ammonium bicarbonate solids. 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.
Publisert
7/20/2010