CO₂ capture in a multistage CFB: Part I: Number of stages

Abstract

The most common technology for postcombustion of CO 2 capture is the amine solvent scrubber. The energy consumption for capturing CO 2 from flue gases using amine solvent technology is 15-30% of the power plant electricity production. Hence, there is a need to develop more efficient methods of removing CO 2 . A circulating fluidized bed using sodium or potassium carbonates is potentially such a process, as their high decomposition pressures allow regeneration at low temperatures using waste heat rather than steam from the power plant. But equilibrium data for the sorbents require the use of several cooled stages to achieve high CO 2 conversions. Here, a method of computing such a number of stages for a given CO 2 conversion was developed using multiphase computational fluid dynamics. It was found that it required six equilibrium stages to remove 96% of CO 2 with the initial mole fraction of 0.15 in a sorption riser. V C 2017 American Institute of Chemical Engineers AIChE J, 63: 5267-5279, 2017 CO 2 capture conceptsState of the art of CO 2 capture technologies for existing fossil energy power plants are limited to amine absorbers. 16 They have been used for removal of CO 2 from natural gas for Correspondence concerning this article should be addressed to P. Piumsomboon at pornpote.p@chula.ac.th. Figure 6. Grid selection and simulation validation.(a) Grid selection study. (b) Comparison to the experiments. 39 [Color figure can be viewed at wileyonlinelibrary.com] 5272 Figure 13. Transient CO 2 capture.(a) Removal percent of CO 2. (b) Thermal sensitivity to CO 2 sorption. [Color figure can be viewed at wileyonlinelibrary.com] 5276

Continuous CO2 Capture Performance of K2CO3/Al2O3 Sorbents in a Novel Integrated Bubbling-Transport Fluidized Reactor

“…For the present work, the adsorber was an one-stage bed only, thus η c cannot reach a high value as expected due to the thermodynamic limitations. To overcome the thermodynamic limitation, a multistage configuration was proposed . The reactor is divided into several stacking stationary bubbling beds.…”

“…To overcome the thermodynamic limitation, a multistage configuration was proposed. 32 The reactor is divided into several stacking stationary bubbling beds. The sorbent flows downward, while the gas stream flows upward.…”

Optimum operating parameters of CO2 sorption in turbulent fluidized bed regime using potassium carbonate supported on gamma alumina solid sorbent

“…5(b). 43,47 Here, the thickness of gas lm resistance was seen to be reduced when velocity of gas increased in the rst period. The gas molecule took a shorter time to reach the active site on the support.…”

Sustainability assessment of power production by chemical looping combustion

“…In the CO2 capture section, the operation conditions were followed Boonprasop study. [105][106][107] The multi-stage CO2 capture reactor was the main section of the CO2 capture section. The solid sorbent in CC cases was Na2CO3.…”

“…RYield is suitable to determine the conversion of each stage to consistent with experimental data. [105][106][107] The minimum temperature approach of heat exchanger was 10 o C. The isentropic efficiency of compressor and turbine was 90%. The parameters related to the case studies are presented in Table 1 for cases 1-3, and in Table 2 for cases 4-6.…”