Abstract
The integrated bubbling-transport fluidized bed can realize both sufficient gas-solid contact time and adjustable solid circulation rate. This paper performed a full-loop simulation of continuous CO2 capture process in a dual fluidized-bed system, using the bubbling-transport bed as the adsorber and K2CO3/γ-Al2O3 as the sorbents. Two-dimensional Eulerian-Eulerian models coupling with reaction kinetics were applied in the simulation. The results show that the adsorption reaction mainly takes place in the bubbling section of the adsorber, but rarely in the central riser and transport section. The increase of the sorbent circulation rate and the water vapor concentration in flue gas benefit the CO2 capture performance, and the latter is more preferable. Together with the sorbents, part of flue gas is entrained from the bubbling section to the central riser, causing an apparent fluctuation of sorbent circulation, as well as a low global CO2 capture efficiency due to the insufficient gas-sorbent contact.
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