Assessment of options for CO2 capture and geological sequestration
Comparison of CO2 capture technologies and enhancing CMM production with CO2
This project carried out research on a number of technologies which may be deployed for carbon capture and examined the possibility of using CO2 to enhance production of methane from disused coal mines. Parametric studies of oxyfuel coal combustion were completed under atmospheric conditions at 40 kW and 1 MW scale and at pressures up to 7.5 bar. A series of implications were drawn for the design and operation of a full-scale plant. Ceramic membranes were developed for CO2/H2 separation in gasification systems with catalytic destruction of NH3/H2S. Various techniques were employed to improve... selectivities but achieving defect-free surfaces proved difficult. An apparatus was developed and also used to assess commercial Pd-Cu-Ag/V membranes. Reactor models were devised and concepts invented to allow effective use of membranes with low selectivities. Gas-liquid contact membranes were tested and proved to be a very promising alternative to conventional scrubbers. They offer high mass transfer area and modularity, with major reduction in device volume. A range of solid adsorbents for CO2 removal from post-combustion flue gas were developed and tested, with adsorption capacities >10 wt%. Regeneration strategies, both thermal swing with inert stripping gas were explored. Large-scale testing of adsorbent demonstrated that gas residence time is a key factor in determining adsorption performance. The programme established scientific and economic models of the methane production potential of CO2 injection into remnant coal-seams and validated the scientific model against commercial projects. Implications for the application to a full-scale plant of all the technologies have been reviewed.