PRE
COMBUSTION CARBON CAPTURE & STORAGE (CCS)
A key part of this technology is the removal of CO2 and
H2S from the synthetic gas (Syngas) stream by scrubbing
with a physical solvent. The captured CO2 can then be further
processed or sequestered underground or at sea.
Proven technology includes the SelexolTM
Process, patented in the late sixties by the Allied Chemical
Group, which used a solvent made of a mixture of dimethyl
ethers of polyethylene glycol. The Dow Chemical Company
acquired the gas processing expertise from Union Carbide
in 2001 which is offered under license by several engineering
companies. Clariant GmbH produces an equivalent solvent
with their Genosorb product range.
CHEMCAD is being used to simulate this
process involving the absorption, desorption and compression
of CO2. A modified equation of state model has recently
been developed to provide enhanced performance prediction
of this process.
POST COMBUSTION CARBON
CAPTURE & STORAGE
Key parts of this technology are Flue Gas Desulphuristaion(FGD)
for the removal of SO2 by spray scrubbing with limestone,
direct contact cooling (DCC) and then reactive absorption
of CO2 using inhibited amine blends. The captured CO2 is
then desorbed and compressed for transfer and sequestration
in an appropriate reservoir.
Process models have been developed, using
CHEMCAD, based on a study carried out by the International
Energy Agency (IEA). Thermodynamic K values used were NRTL
with Electrolyte for FGD, Ideal Vapour Pressure for DCC,
Amine for CO2 Absorption and Desorption and Benedict Webb
Ruben Starling (BWRS) Equation of State, with modified parameters,
for Compression.
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