Abstract
The effect of cyclic carbonation–decarbonation operating parameters on Zr-doped CaO sorbent CO2 uptake capacity evolution is examined. It is revealed that the capacity steady state value increases with the decrease in the carbonation temperature, CO2 concentration in the gas flow upon carbonation and with the increase in the heating rate from the carbonation to the decarbonation stages. The rise in decarbonation temperature leads to a dramatic decrease in the sorbent performance. It is found that if carbonation occurs at 630 °C in the gas flow containing 15 vol.% CO2 and decarbonation is carried out at 742 °C, the sorbent shows the highest values of the initial and steady state CO2 uptake capacity, namely, 10.7 mmol/g and 9.4 mmol/g, respectively.
Highlights
Nowadays, three technologies are considered promising for large-scale post-combustionCO2 capture, namely, amine scrubbing, pressure swing adsorption and calcium looping (CaL) [1,2,3,4]
The pressure swing adsorption using physical sorbents is characterized by low selectivity, limitations on operating temperature and high operating pressure to achieve high CO2 uptake capacity
Both amine scrubbing and pressure swing adsorption can only be used for CO2 sorption from the flue gas produced during fossil fuel combustion after the flue gas precooling
Summary
Three technologies are considered promising for large-scale post-combustionCO2 capture, namely, amine scrubbing, pressure swing adsorption and calcium looping (CaL) [1,2,3,4]. The pressure swing adsorption using physical sorbents is characterized by low selectivity, limitations on operating temperature and high operating pressure to achieve high CO2 uptake capacity Both amine scrubbing and pressure swing adsorption can only be used for CO2 sorption from the flue gas produced during fossil fuel combustion after the flue gas precooling. The CaL process has a number of major advantages: operating at atmospheric pressure and the use of circulating fluidized bed reactors—a mature technology at a large scale, the energy efficiency penalty is relatively small compared to amine scrubbing, the possibility of selective CO2 trapping from hot flue gas, synergy with the existing power plants and cement plants and use of sorbent derived from cheap environmentally benign friendly raw materials (limestone and dolomite) [5,6,7]. The CaL process is a promising approach for CO2 utilization since it provides a high-concentrated CO2 stream during decarbonation [5,6]
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