The capital outlay of purchasing equipment for retrofitting existing power plants is high
enough, but the energy needed to capture CO2 means one third more coal must be burnt, and
building new CCS plants is at least 75% more expensive than retro-fitting.
Some CCS technology is untried, for example, the Syngas-driven turbines in an IGCC system
have not been used on an industrial scale. Post capture, CO2 must be compressed into a
supercritical liquid for transport and storage, which is also costly. The Qatar Carbonates and
Carbon Storage Research Centre predicts 700 million barrels per day of this liquid would be
produced if CCS were adopted modestly. It is worth noting that current oil production is around
85 million barrels per day, so CCS would produce
eleven times more waste for burial than oil
that was simultaneously being extracted.
Sequestration has been used successfully, but there are limited coal and oil fields where optimal
conditions exist. In rock that is too brittle, earthquakes could release the CO2. Moreover,
proposals to store CO2 in saline aquifers are just that – proposals: sequestration has never
been attempted in aquifers.
Most problematic of all, CCS reduces carbon emissions but does not end them, rendering it a
medium-term solution.
Dostları ilə paylaş: